We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Box of 100 black oxide socket head cap screws 1/4-28 x .5 in

Kerr Lakeside

Kerr Lakeside .25-28 x .5 in. Socket Head Cap Screw Black Oxide 100 Pieces

SKU CH-K9ZQ-CTQD5

1/4-28 x 1/2 inch fine-thread alloy-steel socket cap screws, black-oxide finish, 180000 psi tensile strength, 100 pieces

  • TypeSocket
  • Meets ASTM A574 / ANSI B18.3 for reliable structural fastening
  • Black oxide finish adds corrosion resistance and a low-glare surface
  • Alloy steel hardened to Rockwell C 38-43 delivers 180000 psi tensile strength
  • Fine UNF 1/4-28 thread with full .5 in. engagement ensures precise fit
  • 100-piece pack weighing 1.15 lbs keeps inventory stocked for production runs

Kerr Lakeside .25-28 Socket Cap Screws

These Kerr Lakeside socket head cap screws feature a 1/4-28 UNF fine thread and a 0.5-inch length. Made from alloy steel with a black oxide finish, they meet ASTM A574 and ANSI B18.3 standards. The pack contains 100 pieces suited for precision fastening tasks.

For precision assembly, not heavy structures

Mechanics and fabricators needing high-tensile, fine-thread fasteners in bulk will find this pack suitable. Builders requiring coarse threads, longer lengths or corrosion-resistant stainless steel should look at other fastener types.

180000 psi tensile strength defines the load limit

The alloy steel construction delivers a minimum tensile strength of 180000 psi with Rockwell hardness RC 38-43. This specification determines whether the screw handles the required clamping force in your application.

Highlights

  • Meets ASTM A574 / ANSI B18.3 for reliable structural fastening
  • Black oxide finish adds corrosion resistance and a low-glare surface
  • Alloy steel hardened to Rockwell C 38-43 delivers 180000 psi tensile strength
  • Fine UNF 1/4-28 thread with full .5 in. engagement ensures precise fit
  • 100-piece pack weighing 1.15 lbs keeps inventory stocked for production runs

Specifications

BrandKerr Lakeside
TypeSocket

Questions about this item

What drive tool do I need for the hex socket head on these 1/4-28 x .5 in. screws?

A hex key or hex bit matching the socket size drives the head; the screws have a standard hex socket drive design.

Will the UNF fine thread on these .5 in. screws match the existing tapped holes in my fixture?

The screws use a 1/4-28 UNF right-hand fine thread; verify the hole is tapped to the same UNF 1/4-28 specification before installing.

How can I confirm the black oxide finish meets the ASTM A574 hardness range after installation?

The alloy steel screws are rated Rockwell C 38-43 with 180000 psi minimum tensile strength; a hardness tester can verify the RC 38-43 range on installed fasteners.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.