7 things you need to know
If you sell to the military either directly or indirectly, then you are probably familiar with Mil-spec fasteners. But, what exactly are they and what should you know before buying them? We’d like to help you out with this Seven point buyer’s guide.
- What does Mil-spec mean anyway?
Mil-spec or MIL-STD, is the informal name for the military standard the U.S. Department of Defense uses in the production of military equipment. Critical fasteners and components used in the production, repair and maintenance of this equipment are classified as “Mil-spec” fasteners. These parts are usually designated by an AN, MS, NAS or NASM prefix followed by a part number (i.e. MS24693C-4). Each of these prefixes is an abbreviation: for example: NAS stands for National Aerospace Standard and MS stands for Military Standard.
- What’s the difference between Mil-spec and commercial fasteners?
Mil-spec fasteners look a lot like their civilian cousins, but these little guys are made to a specific standard that defines in detail, the screw’s attributes, including: dimensions, tensile strength, hardness, threads, drive type, material qualities and plating, just to name a few. Mil-spec fasteners are even traceable by lot to designated manufacturers. The government maintains a list of factories that are qualified to manufacture and distribute Mil-spec fasteners. These suppliers have met all the government’s requirements and pass the highest quality control standards. This designation is called Qualified Suppliers List for Manufacturer’s [QSLM]. Commercial fasteners are not held to such specific and exacting standards.
- Who uses Mil-Spec Fasteners?
Mil-spec fasteners are used by anyone manufacturing or servicing military equipment. How do you know if your project requires Mil-spec parts? Often, the bill of materials (BOM) calls for specific Mil-spec grade fasteners in accordance with a part number, drawing, NIIN or NSN or procurement requirement. Some of the most common uses of Mil-spec fasteners include aerospace and naval vessels.
- Do Mil-Spec fasteners have different features and standards than commercial fasteners?
Mil-spec parts are manufactured and tested to strict military standards ensure performance and reliability. In general, commercial fasteners will not have the same exacting quality standards. Let’s look at a specific example and compare the Mil-Spec MS24693-C4, which is a 4-40 x 3/8 Phillips Flat 100 degree Machine screws in 300 series stainless steel, to its commercial cousin.
Features of the MS24693C-4:
- Manufactured in an QLSM approved factory
- Made/melted in the USA or other DFARs* approved country
- Materials to procurement spec FF-S-92, SAE AIR 4127
- Cleaned, descaled, passivated to AMS-QQ-P-35; AMS 2700
- Dimensions, tensile, hardness, threads, recess, head marking to AN, MS, NAS, NASM standard
- Magnetic permeability to test specs ASTM A342
- Quality Assurance to procurement spec FF-S-92 MIL-STD 1312
- Inspection system requirements per Mil-I-45208
- Full lot traceability, manufacturer’s certification and chemical and physical certification
- Available in diameters from #0 through 1/4 inch in coarse and fine thread and various lengths
Features of a 4-40 x 3/8 Commercial Phillips Flat 100 degree Machine screws in 18-8 series stainless steel:
- Manufactured per ASME B18.6.3-2002
- Thread dimensions to ASME B1.1
As you can see, the Mil-spec version is held to a higher and more exacting level of quality and testing than the commercial version. As such, the Mil-spec parts are cleaned and passivated, and tested for magnetic permeability, whereas the commercial parts are not.
5. What level of certification is required?
Generally, a Certificate of Conformance (COC) or a record affirming a fastener has met the requirements of the relevant specification, contract or regulation is sufficient for Mil-Spec fasteners. Full certifications, which include the part name, part description, date of manufacture, lot number, chemical composition of material, and treatment of material including plating or passivation, and material test reports, are often available for a fee. It is critical to ask for the level of certification (COC, full material certs, passivation certs, etc) in advance in order to have the most efficient buying experience.
6. Are there other factors to consider when procuring Mil-spec fasteners?
Great question! Almost a decade ago, the term “DFARS Compliant Material” came to the forefront for companies supplying parts and services to the government. The original Federal Acquisition Regulation (FAR) clause 252.225-7014 specified “A Preference for Domestic Specialty Metals.” What that means in our world is that for fasteners to be DFARS compliant, the metal used to fabricate them must be melted or manufactured in the United States or a qualifying country.
Qualifying countries include: Australia, Austria, Belgium, Canada, Czech Republic, Denmark, Egypt, Finland, France, Germany, Greece, Israel, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, Turkey, United Kingdom of Great Britain and Northern Ireland.
Important Note: DFARS only pertains to fasteners made from “specialty metals” including: stainless steel, high alloy steel like Grade-BD, or Grade 5 Chromium steel with high chromium content.
To keep up to date with DFARs requirements, visit www.acq.osd.mil/dpap/dars/dfarspgi/current/index.html
- Where can I find a list of Mil-spec fasteners and specs?
The Defense Logistics agency is a great resource. They maintain a comprehensive database of specifications and drawings. They also maintain a catalog of hardware that includes NIINs and NSNs that sometimes called out in a bill of materials. Check out the following links for more comprehensive information regarding hardware:
http://www.dla.mil/TroopSupport/IndustrialHardware/ – to view catalogs of mil-spec parts and specs by category
http://quicksearch.dla.mil/qsSearch.aspx – To look up a specific part
http://www.mfsupply.com/mil-spec-fasteners-s/1823.htm – To see MF Supply’s Mil-Spec fastener stock
http://www.mfsupply.com/v/vspfiles/assets/images/MFSUPPLY_MILITARY.pdf – To download MF Supply’s Mil-spec line card
For more detailed information about Mil-Spec parts, to request a Mil-Spec Line Card or to send an RFQ, visit our website. And if you don’t see what you need listed, as always, ask us. “Finding the right screw for you” is our tag line after all!
Contact me at firstname.lastname@example.org with your questions, comments or helpful hints!
7 things you need to know
According to the dictionary, a standoff is defined as “a stalemate or a deadlock between two equally matched opponents and a spacer is a piece of material used to maintain space between 2 things. In the world of precision manufacturing, standoffs and spacers are mechanical components that are used the create space or join parts together, typically in PC boards. Below are 7 things to know to have the most efficient buying process.
Often classified as Electronic or Panel Hardware, Standoffs and Spacers are commonly used to mechanically support and electrically connect and position components within assemblies, typically in PC boards and instrument panels.
- What’s the difference between a standoff and a spacer?
Both standoffs and spacers have a hex or round shaped body, and 2 openings. The main difference is that spacers are unthreaded with an inside clearance hole, and standoffs are threaded on both ends. Threads may be male (external) r female (internal).
- Who uses standoffs and spacers?
Look inside an assembled circuit board, and you will be greeted by a bevy of Standoffs and Spacers, because in the world of Electronic Hardware, they are the standard for connecting and mounting circuit boards, panels, doors, and gears. Both are commonly used to properly position parts within an assembly, to reduce component contact, to elevate stacked sections, to ensure enough room for heat to dissipate, and to separate or create space between two objects. These guys are workhorses!
- What materials and platings are available?
Common materials include aluminum, brass, plastic/nylon and stainless steel. Common platings include clear anodized, nickel, gold iridite and zinc plated. There are over 20 common platings available! Here is a guide to most common materials:
- Aluminumis popular because of its ratio of weight to strength. It is light, non-magnetic, performs well in severe temperatures, and has insulating properties.
- Brassis used in making high-quality standoffs. It is conductive, resists corrosion, and is non-magnetic. It is costlier and heavier than aluminum and is usually plated zinc or nickel.
- 18-8 Stainless Steelis strong, conductive, nonmagnetic and offers excellent corrosion resistance.
- Nylon 6/6is superlight, nonconductive, and resistant to chemicals and solvents.
316 stainless steel, alloy and other exotic materials, and special diameters and lengths are available in certain sizes and/or for special order and usually involve a lead time.
- What sizes are available off the shelf?
Standard stock sizes run from 3/16 – 1/2 body diameter, 1/4 to 2” long with threads starting at 2-56 running through 1/4-20 and clearance holes ranging from #2 though 1/4”. Metric stock sizes run from M3.5-M6 body diameter with M2.5, M3 and M4 threads. Remember, the lengths and threads available depend upon the diameter of the body and not all size configurations will be available.
As always, special lengths and sizes are available – just ask!
- What information should I provide to get an accurate quote?
The easiest way to order is by manufacturer part number. If you don’t have one, you’ll need to specify body diameter, body shape (hex or round), body length, thread size & gender (male or female), material and plating. For example, a popular standoff size is a 1/4 hex x 1/2 Long x 10-32 male Standoff in Stainless Steel.
- Are there other factors to consider?
YES! One surefire way to save money and shorten delivery time is to cross the OEM brand part on your bill of materials to a functional equivalent. Popular brands include: Amatom, Concord, Globe, H.H. Smith, Lyn-tron, Microplastics, Keystone, Pem, RAF, Unicorp.
Finally, standoffs and spacers sometimes show up under their Mil-spec numbers, which can be crossed to commercial equivalents. Some common Mil-spec series include NAS42, NAS43, NAS61, NAS1056, NAS1057, NAS1829, NAS1831. Where applicable, these Mil-spec parts will be DFAR compliant with full paperwork.
Contact me at email@example.com with your questions, comments or helpful hints!
5 Things to Know when Comparing Fastener Brands to Generic Alternatives
This year, we’ve discussed how the trademarked brand Keensert® is often available as a Mil-Spec or generic branded key-locking insert. We also reviewed how national brands of precision shoulder screws, such as Amatom, Concord, RAF and others are also offered by McMaster-Carr (tight tolerance series), MSC, Grainger and generically.
But how exactly do you determine which categories of fasteners cross to generic alternatives? This guide offers creative solutions including when to cross, and how to save money and reduce long lead times by using brand alternatives.
1. What is a functional equivalent when it comes to fasteners and precision components?
You can find hundreds of registered trademark-branded fasteners and components in the industrial marketplace. Much like brand-name pharmaceuticals such as Tylenol and Advil are available generically (as acetaminophen and ibuprofen), some brand name fasteners are also available as “generics,” “crosses,” “alternatives” or “functional equivalents.”
In the world of fasteners, a functional equivalent fastener is a part that is the same as the brand-name product in form, fit and function, including material and plating specifications.
2. How can I determine if I must use the brand name or if I can cross to a generic part?
Before you shop, check the bill of materials to see if it specifically calls out a particular brand name along with the part number. If no specific manufacturer’s name is listed, then you can typically use a functional equivalent.
Use this handy 4 point checklist as your guide:
- Does your bill of materials specifically call for the OEM brand-name fastener or component?
- Can you live with the lead time or will having parts sooner improve delivery of the final product?
- Will your supplier provide a certificate of conformance?
- Will saving money help you be more competitive?
3. What categories of fasteners are available as generic or functional equivalents?
Popular categories include adhesives and sealants, anchors, bits and nutsetters, cage nuts, flex type lock nuts, handles, Keenserts, knurled thumb screws, nylon insert stop nuts, precision shoulder screws, retaining rings, rivets & blind threaded inserts, self-clinching, fasteners, spacers and standoffs, speed clips, spring nuts, weld nuts, weld studs, and woodworking screws.
4. What brands of fasteners should I consider crossing to their generic or functional equivalent?
3 STAR RIVETS USA, ABBATRON®, ALCOA, AMATOM®, APEX®, ARCONIC®, ATLAS®, AVDEL®, AVK®, B. F. GOODRICH, BOLLHOFF, BUCKEYE, CAPTIVE, CELUS®, CHERRY®, CONCORD, FASTENAL, GESIPA®, GRIPCO®, GLOBE ELECTRONICS, H. H. SMITH, HUCK, INDUX, INTERFAST, KEYSTONE, LOCTITE®, LYN-TRON, MACLEANESNA®, MARSON®, MCMASTER-CARR, MISUMI, MSC INDUSTRIAL, PEM®, PIC DESIGN®, POP®, POWERS®, QUICKSCREWS, RAF, RED HEAD®, ROTOR CLIP®, SHEREX, SIMPSON, SOUTHCO®, SPS TECHNOLOGIES, TINNERMAN®, U. S. ANCHOR. VIP, W. M. BERG, W. W. GRAINGER, WALDES TRUARC®.
5. What are the advantages of using functional equivalents?
Brand names are great, and when they are in stock, available and required by your customer, then you can buy them with confidence in their quality. However, one surefire way to save money and shorten delivery time is to cross the OEM brand part on your bill of materials to a functional equivalent.
Supplying a full range of fastener products and services, MF Supply is an authorized distributor of Amatom/Carey, Captive (Pem equivalent), Chrislynn Inserts, Concord, EZ-Lok, Lok-mor, Lyn-tron, Microplastics, Shear-loc, S&M Retaining Rings, and Unicorp, as well as a distribution partner for many others. We have an expertise in dowel pins, inserts and Keenserts and domestic and Mil-Spec products.
We provide functional equivalents to expensive brand name fasteners and help our customers save money while reducing long lead times. Check out our recent case study where a functional equivalent was substituted for an OEM brand, reducing costs by 37% and shaving lead time. This time and money savings gave the manufacturer an advantage over their competition, which helped them win the job.
For more detailed information about brands we commonly cross, visit our website. And if you don’t see it listed, as always, ask us. “Finding the right screw for you” is our tag line after all!
MF Supply is a WBE/WOSB certified stocking distributor of precision fasteners and electronic components, specializing in precision hardware including precision shoulder screws. For more than 40 years, we have been supplying manufacturers in the electronics, industrial, commercial, aerospace and military markets with the full range of fastener products and services.
8 Things to Know When Buying Dowel Pins
If you are a manufacturer working with complex assemblies or fixtures, then you’re likely very familiar with precision dowel pins. Commonly used as a hinge, shaft or pivot to locate or hold assembled parts together, dowel pins can withstand frequent insertion and removal without distortion. They are broadly used across various applications in many industries, including: aerospace, electrical motors, hydraulic equipment, instrumentation, tooling and fixtures, machinery, military and many more.
Our goal is to help simplify the buying process for this sometimes complex and confusing category of fasteners.
1. What is a precision dowel pin?
Dowel pins are solid, headless cylindrical shaped straight metal pins with a centerless ground finish. Manufactured to precise fractional diameters and lengths, dowel pins come in a variety of sizes, styles, designs and materials. This variability can cause confusion among buyers, engineers and end-users alike.
2. What materials and platings are available?
Precision dowel pins are available off the shelf in alloy steel (typically hardened) and stainless steel grades 18-8/303, 316 and 416 (typically hardened). Other exotic materials or special finishes are available for special order with a lead time.
3. What sizes are available?
Standard sizes include inch from 1/16″ to 1″ diameter, and metric from M1 to M20 diameter. Length options vary by diameter. Other diameters and special lengths are available for special order and usually involve a lead time.
4. When ordering, do I need to specify the dowel pin tolerance or call out attributes such as standard, undersized or oversized fit?
Precision dowel pins often show up under their MIL-SPEC numbers, MS16555, MS16556 and Mil-P-21143. Metric dowel pins might show up under the following DINs and ISO numbers: DIN 7, DIN 6325, and ISO 2338 and 8734. Dowel pins might also show up under a manufacturer part number such as Pic, WM Berg, Unbrako or Holo-Krome. If you are ordering by MIL-SPEC, manufacturer’s part number or DIN, then the general attributes including tolerance and style are known. Here are a few of the other options that will help you order the correct pin:
The most common standard inch or imperial sized precision dowel pin is made to the ASME ANSI B18.8.2 spec and has a diameter tolerance of -0.00 / +0.0002 and length tolerance of +/-0.010. For example, a ¼” (0.25) diameter standard dowel pin will have a diameter between 0.2500–0.2502″.
The standard metric tolerance is related to the DIN. Both DIN 7 and DIN 6325 have a standard m6 diameter tolerance of +0.012mm / +0.004mm and a length tolerance related to the specific pin length.
Undersized series dowel pins are used for inconsistent holes. They have a basic diameter 0.0002″ under the nominal diameter. For example, a ¼” (0.25) diameter undersized dowel pin will have a diameter between 0.2500–0.2498″. The Mil-P-21143/2- falls into the undersized category.
Important note: All pin options may not be available in all sizes and materials.
Finally, the Oversized series of dowel pins are usually used to fit into worn holes and are generally used in the aftermarket for repairs. These pins are only available off the shelf in steel in a small range of sizes.
5. Can I specify if I need radius or chamfer on the pin ends?
The pin style will depend upon the spec and the material. Precision dowel pins may come with either a double chamfer or a radius on one end and a chamfer on the other end. Specific style requirements are available for special order and usually involve a lead time.
6. What information do I need for ordering?
The easiest way to order is by either the manufacturer or MIL-SPEC part number. To order by description, you need the diameter, length and material and if applicable, and any special tolerance, plating or style requirements.
7. Do I need to buy special installation tools?
Just remember, no hammers! When installing dowel pins, never drive the pin into the hole with force. Always press it in for best results. And production favors pins since they require no extra fastening hardware for insertion, no secondary operations, and no mating parts. This ease-of-use adds up to speedier production, which makes everyone in the food chain happy!
8. What level of certification is required?
Generally, a Certificate of Conformance or a COC is sufficient for your customer. Full certification with material certs and test reports are often available for USA made and MIL-SPEC parts for a fee.
- The full range of commercial and MIL-SPEC parts, including parts that are USA made, DFARS and ROHS compliant.
- Brand names and generic equivalents.
- Custom-made parts per print in non-standard sizes and exotic materials and finishes.
- Inch and metric sizes including ASME ANSI B18.8.2, DIN 7, DIN 6325, and ISO 2338 and 8734
- Metric Precision Dowel pins including Press-Fit A, B and Slip-Fit C series and all MD series pins in 416 and 303 Stainless Steel.
For more than 40 years, MF Supply has helped American manufacturers streamline operations, saving them time and money with our sourcing expertise and unique supply chain strategies. We are a WBE/WOSB certified stocking distributor of fasteners and electronic components.
We work with the best-established factories in the United States and DFARS-certified countries, and stock a huge inventory including all major brands and equivalents. MF Supply provides solutions including: same-day drop ship direct from the factory; custom sizes, materials and plating options; and DFARS parts with full paperwork and Certificates of Conformance.
We creatively solve common problems including hard-to-find parts and long lead times. Our sourcing and reworking expertise includes fast turnaround for modification of existing parts, hard to find standards and specials, special threads, non-standard diameters and lengths, exotic materials, special platings and short runs. We provide functional equivalents to expensive brand name fasteners and help our customers save money while reducing lead times.
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March 7, 2017
In our January blog we discussed how Keylocking Inserts are often referred to by their trademarked brand name Keensert®. The Keensert® is not alone! Did you know that many brand name OEM fastening products and components can be crossed to a generic alternative equivalent product?
Before you shop, check to see if the bill of materials specifically calls out a particular brand name. If no specific manufacturer’s name is listed, then you can typically use a functional alternative or equivalent. Using equivalents and alternatives to OEM brand names can be a smart way to reduce long lead times and/or cut expenses.
Check out this Case Study where an OEM brand was substituted with a functional equivalent, reducing costs by 37% and shaving lead time. This time and money savings gave the manufacturer an advantage over their competition, which helped them win the job.
MF Supply gets a print of the part from SPIROL® and is able to cross it to an exact functional equivalent for an alternative brand we distribute and our factory has in stock. Samples of the alternative fasteners are delivered directly to the customer within 24 hours for inspection and testing.
-MF Supply functional equivalent fasteners shorten delivery time from 4-5 weeks to 2-3 days.
-SPIROL® Price = .11938 each. Total cost $1790.
-MF equivalent price = .075 each. Total cost $1125.
SUMMARY / BENEFIT
-Cost savings of $665 or 37%.
-Display Manufacturer wins bid and is awarded job.
-Work is completed on time.
-Job is more profitable due to cost savings realized on fasteners.
-Job has been a repeater and a money maker for Display manufacturer.
In summary, if your bill of materials calls for an OEM brand fastener or component, find out if you must have the brand name product. In cases where a generic or equivalent alternative part will work, there might be an opportunity to save money and shorten delivery time.
For more information about MF Supply contact:
Robin Lieberman, President
Keensert® Buyer’s Guide
5 Things You Need to Know
If you are a precision manufacturer working in high-torque and high-temperature situations, you might already be familiar with Keensert® key-locking inserts. Common uses include thread repair applications or to provide thread durability in situations such as aerospace assemblies, electronic equipment and suspension units.
But, what exactly are they and what should you know before buying them? We’d like to help you out with this quick buyer’s guide.
- What is a Keensert®?
A Keensert® is a solid bushing style insert that is threaded on both the inside and the outside, and has wedges or “keys” attached at the top. They are generically called key-locking inserts, and are used to distribute loads and repair or strengthen threads against failures due to stripping, seizing or corrosion.
Although the name Keensert® is often used generically (like Band-Aid® or Kleenex®), Keensert® is the registered trademark of Huck Patents (its close cousin, the Keysert® is a registered trademark of Alcoa Fastening Systems.).
Before you shop, check to see if the bill of materials specifically calls out Huck or Alcoa brand as the Keensert® manufacturer. If no specific manufacturer’s name is listed, then you can typically use an alternative like Rock Solid brand, a generic equivalent or cross to a MIL-SPEC part. This becomes important due to price and availability of the brand name parts.
- What materials and sizes are available?
Keenserts are available off the shelf in 303 stainless steel or carbon steel. Standard diameters are: American #6-32 to 1 ½” and Metric M4 to M24. Other diameters (starting at 2-56 and M2) and materials (including 316 stainless steel, and alloys 4140 and A286) are available for special order and usually involve a lead time.
- What information do I need for ordering?
To order, you’ll need the manufacturer’s part number or the internal and external thread and material. Alternatively, key-locking inserts often show up under their MIL-SPEC numbers, which can often be crossed to commercial equivalents. Common MIL-SPEC numbers include: MS51830, MS51831, MS51832, NAS1394, NAS1395, NA0146, NA0147, NA0148, NA0149, NA150, and NA0151.
- Do I need to buy special installation tools?
When purchasing key-locking inserts, check with your production department to make sure you have the tools you need to properly install inserts. You can buy kits that include a tap, drill, and installation tool.
- What level of certification is required?
Generally, a Certificate of Conformance or a COC is sufficient. Full certification with material certs and test reports are often available for a fee.
In summary, in order to have the most efficient Keensert shopping/buying experience, be prepared with the following information before you shop: Do you need the Alcoa or Huck brand product or can you use a generic or MIL-SPEC alternative? Make sure to have the manufacturer’s part number, MIL-SPEC part number or the internal/external thread and material. Do you need an installation tool? Finally, check to see if you require a standard COC or full certs.
For more information about MF Supply contact:
Robin Lieberman, President
July 23, 2014
What the heck are Precision Shoulder Screws?
Here we go again, with our “what the heck is that” series, where we discuss some of the unique fasteners and electronic hardware that manufacturers use in the design and assembly of their products. Today, we will introduce you to the Shoulder Screw.
What is a Precision Shoulder Screw?
Shoulder Screws, which are sometimes called Shoulder Bolts or Stripper Bolts, are (generally) hex socket screws with an enlarged, unthreaded cylindrical shoulder under the head. They are comprised of 3 main parts: the head, the shoulder and the thread. They come in two basic categories, “Commercial” and “Precision”.
Commercial Shoulder Screws are made to inch standard ANSI ASME B18.8.2. The size range for the shoulder diameter is from ¼ to 2”. The thread class is 3A and the tolerance on the shoulder is +.005 / -.005.
Precision Shoulder screws are sometimes referred to as “tight tolerance” shoulder screws. They are not governed by any official ANSI or ASME standard. The size range for the shoulder diameter is from 3/32 to ½. The thread class is 2A and the tolerance on the shoulder diameter varies from +.000/-.001 to -.0005 to -.0015 depending upon the manufacturer. Now that’s precise!
Who uses Shoulder Screws?
Just as Dowel Pins and Retaining Rings are used to locate or hold parts together within a precision assembly or a fixture, so are Precision Shoulder Screws.
Yet shoulder screws are more versatile. When installed, the unthreaded shoulder acts as a shaft for rotating items such as bearings and bushings, precision spacing, machinery support, and motion guiding. Precision Shoulder screws exacting tolerances make them ideal for use with other precision components.
They are broadly used across various applications in many industries, including: aerospace, electrical motors, hydraulic equipment, instrumentation, tooling and fixtures, machinery, military and many more.
What do I need to consider when selecting Shoulder Screws?
Although Shoulder Screws are offered in a multitude of materials and styles, when it comes to the main commercial and precision offerings, there are a few main issues to consider.
Which Drive and Head Style?
Precision shoulder screws are readily available in hex socket and slotted drives. Philips drives are available in certain sizes. Torx and Star are available for special order. Typical head styles are a modified fillister with a flat top where the head diameter is about twice the head height. Low head fillisters are available in certain sizes
Which material do I need?
Precision shoulder bolts are readily available in Type 18-8/303 Stainless Steel and 416 Stainless Steel. 316 Stainless Steel, Alloy and other exotic materials are available for special order.
Are there other factors to consider?
When ordering Precision Shoulder screws, specify the Shoulder Diameter, Shoulder length, thread size, material and drive type. For example, an example of a typical Precision Shoulder screw is a ¼ shoulder x ½ long x 10-32 thread in SS18-8 with a hex-socket drive. Non-locking is the most popular style, but locking may also be available.
Precision Shoulder Bolts often show up under their brand name. Some of the most popular brands include: BERG, Concord, Globe, PIC, Lyn-tron and RAF. A comprehensive selection of Shoulder Screws is also offered by McMaster-Carr (tight tolerance series), MSC and Grainger.
Finally, Precision Shoulder Screws can also show up under their Mil-spec numbers, which include MS51575 & MS51576 and are DFARS compliant with full paperwork.
Precision Shoulder Screws at MF Supply
The full range of commercial and mil-spec parts, including parts that are DFARS and ROHS compliant.
Brand names and generic equivalents.
Custom made parts per print in non-standard and exotic materials and finishes.
Inch and Metric sizes.
For more detailed information on Precision Shoulder Screws, visit us at http://www.mfsupply.com/SearchResults.asp?Cat=1922
And if you don’t see it listed, as always, ask us. Finding the right screw for you is our tag line after all!