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1/4 in.-20 Grade 18-8 Stainless Steel Nylon Insert Lock Nut (20-Pack)

$905
  • Installs easily with most wrenches
  • Designed to be used with the same sized screw
  • Stainless steel construction offers rust-resistant performance
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Product Overview

Lock nuts (or locknuts) feature a nylon insert that grips onto threads and resists loosening due to vibration. It is best to only use each nut once as its holding power is reduced if reused. They should not be used in extremely high heat or in certain chemical environments as that could weaken the plastic insert.
  • Inner diameter-thread size: 1/4 in.-20
  • Features an internal nylon ring that grips bolt threads better than a standard finished nut
  • Great for use in applications where the bolt may be subject to vibration
  • Can also be used as a secondary nut to help lock the main nut in place
  • Side with the nylon insert should face towards the tip of the bolt, not towards the surface being fastened
  • Thread class: UNC-2B thread type: coarse
  • Specifications met: ASME B18.6.6 and ASME B1.1

Additional Resources

From the Manufacturer

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Name1/4 in.-20 Grade 18-8 Stainless Steel Nylon Insert Lock Nut (20-Pack)3/8 in.-16 Grade 18-8 Stainless Steel Nylon Insert Lock Nut (10-Pack)5/16 in.-18 Grade 18-8 Stainless Steel Nylon Insert Lock Nuts (50-Pack)1/2 in.-13 Grade 18-8 Stainless Steel Nylon Insert Lock Nuts (10-Pack)
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Ratings
(4)
(1)
(1)
(1)
Fastener Thread TypeCoarseCoarseCoarseCoarse
Measurement StandardSAESAESAESAE
Finish FamilyStainless SteelStainless SteelStainless SteelStainless Steel
Package Quantity20105010
Size1/4 in3/8 in5/16 in1/2 in
Fastener PlatingStainless SteelStainless SteelStainless SteelStainless Steel
Thread pitch20161813
MaterialSteelSteelSteelSteel
Fastener Callout Size1/4 in.-203/8 in.-165/161/2
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Specifications

Dimensions

Assembled Depth (in.).432 inAssembled Height (in.).308 in
Assembled Width (in.).432 inInside Diameter.25 in
Outside Width (in.).431

Details

ACQ Rated FastenerNoFastener Callout Size1/4 in.-20
Fastener PlatingStainless SteelFastener Thread TypeCoarse
Fastener TypeLock NutFinish FamilyStainless Steel
Grade18-8 StainlessMaterialSteel
Measurement StandardSAEPackage Quantity20
Product Weight (lb.).005 lbReturnable90-Day
Size1/4 inThread pitch20

Warranty / Certifications

Manufacturer WarrantyGoods are warranted against defects in manufacturing for 1 year. In no case is Prime-Line responsible for user related damage or damage incurred during installation. Warranty is void if products are subjected to abnormal conditions, misapplication or abuse.

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Customer Reviews

  • 4
    out of 4 reviews
  • 67%recommend this product
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Showing 1-4 of 4 reviews
Worst nylon insert nut ever!
I got a bunch of these for a project I was constructing. Using a 1 inch bolt 1/4 in.-20 stainless steel, the nut will only go on about 1/8 of an inch and trying to force it further, the bolt will break. I thought it was a fluke. So I tried again and another broken bolt. The nylon is too thick and stops the nut from going on. I even tried to heat the nut up with a heat gun before putting it on and only got about 1/2 inch in on a 1 inch bolt before it would not go on any further.
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    Locks without needing a lock washer with it.
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    The Product is Great! it just took 2 months to get shipped.
    The Product is Great! it just took 2 months to get shipped.
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    • Recommended
    Showing 1-4 of 4 reviews