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Eight black chrome steel lock nuts with nylon inserts in a clear package

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 34123 Nylon Insert Lock Nut 1/4"-20 Steel Black Chrome 8 PK

SKU CH-2WW5-TQKA0

Eight-pack of 1/4"-20 steel lock nuts with nylon inserts that resist loosening under vibration and torque

  • Product typeNuts
  • Nylon insert resists loosening from vibration
  • 1/4"-20 thread fits matching bolts
  • Steel construction provides structural strength
  • Black chrome finish protects against corrosion
  • Pack of eight supplies multiple fasteners

What This Pack Contains

This pack provides eight nylon-insert lock nuts in a 1/4"-20 thread size. They are made from steel with a black chrome finish and are designed to resist loosening when exposed to vibration or torque. The nuts suit automotive, machinery and general assembly tasks where a secure fastening is required.

Build and Mounting Practicalities

The steel body gives the nuts strength for structural joints while the nylon insert creates prevailing torque that holds the fastener tight without additional locking hardware. Black chrome coating adds corrosion resistance for exposed or outdoor installations. Each nut installs with standard hand tools and the eight-piece quantity covers multiple connection points in a single purchase.

The Deciding Specification

The critical detail is the 1/4"-20 thread specification; the nuts only fit bolts or studs with that exact diameter and pitch. Buyers needing a different thread size, a larger quantity or a non-locking nut style will need a separate product.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 63% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameMIDWEST FASTENER
Product typeNuts

Questions about this item

What thread size does the 1/4"-20 nylon insert lock nut fit?

The nut fits a 1/4"-20 thread, so it matches bolts or studs with a quarter-inch diameter and twenty threads per inch.

What physical clearance does the steel black chrome nut need to seat properly?

The hex body requires a wrench or socket that matches the standard 1/4"-20 hex width, and enough depth for the nylon insert to engage fully.

How is the nylon insert lock nut installed, and what step prevents it from working?

Thread the nut onto the bolt until the nylon insert grips the threads, then tighten with a wrench; skipping the final torque step leaves the insert uncompressed and the joint loose.

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