Buyer’s Guide to One and done Keensert® Ordering

keenserts installation

Your 5 point checklist to getting it right the first time

What is a Keensert®?

Keenserts® are solid bushing style inserts that are threaded on both the inside and the outside, and have 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. They are commonly used in precision manufacturing and aerospace applications.

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.).

How do I simplify my buying process to get what I need to complete the job on time and right?

We are all familiar with that classic adage “Measure twice, cut once”.  Nowhere is this more relevant than in the world of manufacturing.  If you are involved in procurement, you are challenged with making sure you have the right parts available at the best price  so your factory can deliver on time and on budget.   Missing tools, incorrect paperwork and long delivery times can cause major headaches and negatively impact service levels.

Our goal is to help you make the Keensert buying process easier, which in turn will eliminate stress, reduce multiple shipments and potentially increase your profits.  The result?  Happier customers (and finance departments too)!  So here it goes…..

  1. Make sure to order the correct part.

Due to the price, availability and high minimum order requirements of Huck or Alcoa branded Keensert® parts,  using functional equivalents including Mil-Spec parts has become a common practice.   Request that your supplier makes reference to the part number listed on your bill of materials on their sales order and packing slip. This will ensure you are getting the functional equivalent that you need.

If you are not ordering by part number, make sure to call out both the internal and external thread including the thread class (UNC, UNF, UNJ), the material and plating, and any special finish you need.

  1. Place blanket orders for your total project needs to get the best price and ensure availability of parts when you need them.

Most standard size non-locking miniature and thin wall / light weight Keenserts® are readily available off the shelf in 303 stainless steel or carbon steel.  However, some locking style, nonstandard diameters, 4140 alloy, A286, heavy duty, extra heavy duty, solid and floating style Keenserts® are available only by special order and usually involve a long lead time.  Make sure to get current price and delivery and order parts as early as possible.  Many suppliers allow you to order now and ship later, which can prevent delivery delays.

If you have an ongoing project, calculate your total needs and place your order with staggered delivery dates.  This will get you the best available pricing and ensure you have the parts when you need them.  Remember, price breaks can start at as few as 100 pieces.

  1. Order (the correct) installation tools with Keenserts® for maximum efficiency.

Whereas most common size and material installation tools are readily available off the shelf, less popular sizes and materials might involve a lead time.  Parent materials harder than RC30 or Anondized Aluminum may require that the tapped holes be broached for the keys, which requires the use of broach blades.

 

broaching tool

In addition, there are manual and power installation tools to choose from, so consult with your supplier on which tool is correct for your job.  Note:  manual tools work well for jobs up to 999 Keenserts®.  For installations of 1000 Keenserts® or more, a pneumatic tool is recommended.

  1. Order the Correct drills and taps for proper installation

Although Keenserts® are installed with standard drills and taps (plus the installation tool and a hammer) each part has a specific hole/tap dimensional recommendation. The drills used are often oversized for the external thread size.  When purchasing key-locking inserts, check with your production department to make sure you have everything you need for proper installation. Note: Drill is oversize see charts for proper dimensions.

Kits are handy to have in the shop and are available for most common sizes.  These kits include 2+ Keenserts®, the associated drill, tap and manual installation tool along with instructions for correct installation.

  1. Request COC, MTRs, DFAR and all required paperwork on your RFQ and PO.

Since using functional equivalents including Mil-Spec parts is a common practice, make sure you have dotted your i’s and crossed your t’s when it comes to paperwork.  Ask your supplier to reference the branded part number listed on your bill of materials on their COC and packing slip to make sure you are getting the functional equivalent that you need.  In most cases, a Certificate of Conformance or a COC referencing the part number you ordered is all the paperwork you need.  Certain aerospace customers need a complete Manufacturer’s Test Report (MTR) package including DFAR statement and passivation certs with full lot traceability.  This might involve a fee, so include it in your RFQ.  Whatever your requirement, include it on your Purchase Order to make sure you have what you need to satisfy your customer’s needs.

In summary, follow this handy 5 point guide when ordering Keenserts® and watch your costs decrease and your service levels soar!

For more information about MF Supply contact:

Robin Lieberman, President
robin@mfsupply.com
973-777-5411


Case Study: Smart Manufacturers use Brand Equivalents to Save Time and Money

Newsletter
Volume 20
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.

Little Known Ways to Save 37% and Shorten Delivery Times
 
ISSUE
Display Manufacturer is bidding on a job where the bill of materials calls for 15,000 pieces of an 8-32 x .312 brass insert by SPIROL®. SPIROL® has 265 local stock, 5000 due in 10 days, balance in 4-5 weeks. Based on this delivery schedule, the Display Manufacturer cannot meet their prospective client’s two week delivery requirement.

SUGGESTED SOLUTION
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.

The alternative sample fasteners are approved for production by the Display Manufacturer within 2 days. The prospective client approves the substitution and awards the manufacturer the business.  A Purchase Order for the inserts is issued to MF Supply. Within 48 hours, the complete 15,000 inserts are available from the factory and delivered to the Display Manufacturer.

TIME SAVINGS
-MF Supply functional equivalent fasteners shorten delivery time from 4-5 weeks to 2-3 days.

COST SAVINGS
-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
robin@mfsupply.com
973-777-5411


Keensert® Buyer’s Guide

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.

  1. 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.

  1. 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.

  1. 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.

  1. 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.

  1. 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
robin@mfsupply.com
973-777-5411

 


What the heck is a Keensert® Key-locking insert?

 

 

What the heck is a Keensert® Key-locking insert?

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  Key-locking insert 

 

We close out the first quarter of 2013 by introducing you to the Keensert Key-locking insert. Like its relative, the Helical wire insert, (see January 2013), the Key-locking insert was originally designed to repair parts with damaged threads.

What is a Keensert Key-locking insert?

The Key-locking threaded insert is a solid bushing style insert that is threaded on both the inside and the outside, and has wedges or “keys” attached to the top of the insert. Keensert® is the registered trademark for one of the most popular brand names for this part and is used commonly to describe this insert.

Who uses Key-locking inserts?

Generally, Key-locking inserts are used to distribute loads and strengthen or repair threads against failures due to stripping, seizing or corrosion.  Key-locking inserts are commonly used in high torque and high temperature situations, and in applications where fasteners may be repeatedly removed and reassembled.

Typical applications are transmission housings, electronic equipment and suspension units. Key-locking inserts are common in the aerospace industry.

Why use a Key-locking insert vs. a Helical wire insert?

There are three main differences between Key-locking inserts and Helical Wire Inserts: Key-locking inserts are stronger than helical wire inserts, they are easier to install than helicals, and they are more expensive!

In heavy wear, high vibration and high heat situations where saving space is not a concern and hole depth is limited, Key-locking inserts are the best bet. Their “keys”, which are driven down into the tapped threads, provide a mechanical lock against rotation, especially when the mating stud or bolt will be removed frequently.

When reducing costs and minimizing space are priorities, helical wire inserts are the way to go. They are particularly useful for creating permanent strong threads in softer materials such as aluminum, titanium and magnesium alloys, and are best suited to lower heat and lower torque environments.

What styles are available?

Key-locking inserts come in four main styles: Miniature, Thin Wall, Heavy Duty Wall (general purpose) and Extra Heavy Duty. Inserts can be locking or non-locking.

Miniature Key-locking inserts are used in electronic and aerospace applications where size and strength are critical. These inserts may be installed in sheet material as thin as 1/16″.

Thinwall  inserts have smaller external threads than standard heavy-duty inserts and are ideal for tight spaces where less pull-out strength is acceptable.

General-purpose Heavy Duty inserts have a thick, heavy-duty thread wall, suitable for most applications.

Extra-heavy duty inserts are used in oversized and overly worn holes.

Installation is 5 easy steps!

1) Drill with a standard tap drill and countersink with a standard 82° – 100° countersink (90° for Miniature Inserts). Note: Drill is oversize see charts for proper dimensions.

2) Tap new threads with a standard tap.

3) Screw in the insert until it is .010-.030 (.005-.015 for Miniature Inserts) below the surface. Keys locate the proper depth.

4) Drive keys down with several hammer taps on the proper installation tool.

5) You are done!  

 

Considerations for selecting and using Key-locking inserts.

  • Inserts often show up under their Mil-spec numbers, which can be crossed to commercial equivalents. Some common Mil-spec series for Key-locking inserts include: MS5180, MS51831, MS51832, NAS1394, NAS1395, NA0146, NA0147, NA0148, NA0149, NA150, NA0151.
  • As discussed, Key-locking inserts are often referred to by their brand names, which can often be substituted by generic equivalents. Popular brands include: Alcoa, Fairchild, Keensert and Tridair.
  • Materials available include Carbon steel, Stainless Steel, Alloy 4140 and A286.
  • Diameters available: American – #6   to   1 1/2 ” and Metric – M4   to   M24
Key-locking inserts at MF SupplyWe offer:  

  • The full range of commercial and mil-spec parts
  • Products kits including single and multiple sizes
  • We are authorized distributors for Chrislynn and E-Z Lok

For more detailed information on Key-locking insert, visit us at http://www.mfsupply.com/Keensert_Style_Inserts_s/1864.htm

And if you don’t see it listed, as always, ask us. Finding the right screw for you is our tag line after all!


What the heck is a Wire Insert?

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Today, we will introduce you to the Wire insert which was originally designed to repair parts with damaged threads, but has evolved for use in a variety of applications that save time and money and improve product reliability.  Do we have your attention?  Great, then read on…

What is a Wire Insert?

Wire inserts are precision-formed continuous wire coils that provide permanent, wear-resistant threads which exceed the strength of the parent material. Often underestimated, the popular misconception is that Wire inserts are intended solely for thread repair, when, in fact, they have other significant uses discussed in the next section. Not to be confused with other types of solid inserts or rivnuts, Wire inserts resemble springs and are sometimes referred to as “helicals”.

Who uses Wire Inserts?

Wire inserts are used for 3 main reasons: 1) to repair damaged threads in parts that would otherwise have to be scrapped; 2) to strengthen threads against failures due to stripping, seizing or corrosion; 3) to convert threads between inch and metric sizes. We told you they were versatile!

What styles are available? 

Wire inserts come in 2 main styles: tang and tangless.

The original and widely used tang style has a prong at one end to facilitate installation. The newer tangless style is becoming popular since this style had no prongs to break off, retrieve, or lose and is easily adjusted or removed after installation.  Tangless inserts are commonly used in electronic applications where loose tangs might cause damage.

Wire Inserts can be free-running or locking.

Free running is the most common style used for thread repair. The “free” diameter of the insert is larger than the installed diameter and this configuration generates balanced pressure distribution between the coils and threads.

Locking style inserts are recommended for applications that require constant torque, or are subject to stress or vibration. The locking style features a crimped turn that acts as a locking mechanism that grips the bolt or screw to prevent loosening from vibration, eliminating the need for lock wiring, lock-nuts, lockwashers, pellets/patches or other thread locking devices.

A third commonly used insert that deserves an honorable mention is a K-type Insert. Sometimes called by the brand Keensert, these externally threaded solid style inserts can be used in almost any material: aluminum, magnesium, cast iron, carbon steel, stainless steel and plastic. K-type inserts have locking “keys” that provide a mechanical lock, and are commonly used in heavy wear and high vibration situations.

5 Features & Benefits of Wire Inserts 

1. Repair rather than scrap parts – Wire inserts remain the most cost effective, efficient and fastest method to repair damaged threads.

2. Stronger Assemblies – The flexibility of the insert provides a more balanced load distribution, practically eliminating thread erosion and providing better stress allocation, even in low strength materials.

3. Wear and Corrosion Resistance – Thread life is increased as thread friction is virtually eliminated, which becomes valuable in applications requiring repeated assembly and disassembly. Surface coatings are available for applications involving severe corrosive and extreme temperature conditions.

4. Minimize space and weight – Lighter and less expensive than other thread inserts, these wiry fellows can be incorporated into existing designs, often allowing the use of thinner or lighter parent materials.

5. Convert threads from Metric/Inch – Rather than replace all your hardware, taps and dies, you can use Wire inserts to convert threads and use your existing hardware and tools.

Lesson Learned, considerations when selecting and using Wire Inserts

  • Inserts are easy to install!   You can use standard drill bits and plug taps to drill and tap the hole.
  • For high volume installations, consider strip feed inserts or use  automatic or air-driven installation tools.
  • Inserts often show up under their Mil-spec numbers, which can be crossed to commercial equivalents. Some common Mil-spec series include MS122076 thru MS122275, NAS1130, MS124651 thru 124850, MS21208, MS21209, MS122076, MS33537, MA3279, MA3329, NA0276.
  • Wire inserts are sometimes referred to by their brand names, which can often be substituted by generic equivalents. Popular brands include: Helicoil, Kato, Keensert and EZ Lok.
  • Materials available include 18-8 stainless steel, phosphor bronze, X 750 Inconel, 316 Stainless steel and inserts may be lubricated or dry filmed to offer easy threading and corrosion protection.
Wire Inserts Available at MF Supply

Here at MF Supply, we supply some of the most common and unusual Wire inserts, including:

  • The full range of commercial and mil-spec parts
  • Products kits including single and multiple sizes
  • Specials including Giant metric, 8-pitch kits, left hand kits and special lengths and diameters
  • We are authorized distributors for Chrislynn and E-Z Lok

For more detailed information on Wire inserts, visit us at http://www.mfsupply.com/SearchResults.asp?Cat=1821

And if you don’t see it listed, as always, ask us. Finding the right screw for you is our tag line after all!

About MF Supply
For over 35 years, MF Supply has been a trusted supplier of Fasteners and Electronic Hardware to OEMs, machine shops, manufacturers, and assemblers of machines and instruments in New Jersey, the greater NYC Metropolitan area and beyond.   We are wholesale only.

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