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Pack of 100 black oxide alloy steel button head cap screws with hex socket drive

Kerr Lakeside

Kerr Lakeside 1/4-28 x 1 Button Head Cap Screw Pack 100

SKU CH-S79N-ERD34

Pack of 100 alloy-steel button-head cap screws, 1/4-28 UNF thread, 5/32 in hex drive, black-oxide finish, Class 3A, 180 000 PSI tensile, meets ASTM A574 and ASME B18.3

  • Secure fastening with 180,000 PSI tensile strength
  • Precise 5/32 inch hex drive for reliable installation
  • Corrosion-resistant black oxide finish on alloy steel
  • 100-piece pack covers multiple assembly tasks
  • Meets ASTM A574 and ASME B18.3 standards

Button Head Cap Screw Pack

This pack contains one hundred 1/4-28 UNF alloy steel button head cap screws with a black oxide finish. Each screw is fully threaded to one inch with a hex socket drive sized at 5/32 inch. The Class 3A threads and Rockwell hardness of RC 38-43 suit precision assembly and maintenance tasks in automotive or industrial settings.

Sustained Load Behaviour

The screws meet ASTM A574 and ASME B18.3 standards with a minimum tensile strength of 180,000 PSI. Under continuous clamping force the alloy steel resists stretch and the black oxide finish provides mild corrosion resistance. Fully threaded shanks distribute load evenly along the engaged length for reliable joint integrity over time.

Compatibility Check

Verify that the mating threads are 1/4-28 UNF Class 2B or 3B and that a 5/32 inch hex key is available for installation. Confirm the one inch length under head and head diameter range of 0.419 to 0.437 inch fit the counterbore and clearance in your fixture. Ensure the application does not require a zinc plated or stainless alternative.

How it compares

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

Price $8.99
Cheaper than about 90% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameKerr Lakeside

Questions about this item

How much heat or noise do the 1/4-28 x 1 button-head screws generate during continuous use?

These are passive fasteners with no moving parts, so they produce no heat or noise regardless of how long they remain installed.

What driver size is required to install the 5/32 in hex socket on these screws?

A 5/32 in hex key or bit fits the internal drive; no other tool is needed for installation.

Will the Class 3A UNF threads on these alloy-steel screws mate correctly with older 1/4-28 tapped holes?

Yes, the Class 3A fit follows the standard 1/4-28 UNF specification, so they thread into existing 1/4-28 holes without modification.

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