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 alloy steel socket cap screws 1/4-20 x 3/8 in

Kerr Lakeside

Kerr Lakeside 25C37KCS 1/4-20 x 3/8 in. Socket Cap Screw, 100 Pieces

SKU CH-APJS-JS7KW

A pack of 100 alloy-steel socket cap screws with a 1/4-20 UNC thread, 3/8 in. length and black-oxide finish

  • Alloy steel construction delivers 180000 psi tensile strength
  • Black oxide finish resists corrosion in harsh environments
  • Full thread design provides maximum grip along entire .375 in. length
  • Hex drive allows secure installation with standard tools
  • 100-piece pack supplies enough fasteners for large projects

1/4-20 x 3/8 in. Socket Cap Screws

This pack contains one hundred alloy steel socket cap screws with a black oxide finish. They meet ASTM A574 and ANSI B18.3 standards and are RoHS compliant. The coarse UNC thread is right-hand and runs the full .375 in. length. A hex drive allows installation with standard Allen keys.

Limits of the coarse UNC thread

Coarse threads resist stripping in softer materials but offer less fine adjustment than fine-pitch alternatives. The .375 in. thread engagement depth limits holding power in thin workpieces. Black oxide provides mild corrosion resistance but is not a substitute for plating in harsh environments. Rockwell hardness of RC 38-43 suits general fastening but not high-impact loading.

180,000 psi tensile strength

This tensile rating determines whether the screw survives the intended clamping load without yielding. Verify that the applied preload and service stresses remain below this value for the joint design. If the application demands higher strength or a different thread length, these screws are not the correct choice.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $12.99
Cheaper than about 82% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameProspect Fastener

Questions about this item

Which thread size and length should I pick from the listed callout?

The callout size is 1/4-20 x 3/8 in., meaning a quarter-inch diameter with 20 threads per inch and three-eighths inch length.

What does the 180000 tensile strength figure mean once the screw is installed?

It indicates the alloy steel can withstand 180000 psi before breaking, so the joint holds high clamping loads in structural or machine assemblies.

What drive standard does the hex socket follow and what torque limit does it impose?

The hex drive conforms to ANSI B18.3, letting you apply torque with a standard Allen key up to the key's own rating.

More in Bits, Hole Saws & Accessory Kits

Similar items