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Box of 100 black oxide button head cap screws 1/4-20 x 1/2 in

Kerr Lakeside

Kerr Lakeside 25C50KBC 1/4-20 x 1/2 in Button Head Cap Screw 100 pcs

SKU CH-JR9W-MQNT1

1/4-20 x 1/2 inch alloy-steel button-head socket screws with black-oxide finish, fully threaded, hex-drive, 100 pieces

  • Product typeSocket
  • Main materialHAWA
  • Alloy steel construction ensures high strength
  • Black oxide finish resists corrosion
  • Fully threaded for maximum grip
  • Hex socket drive allows secure tightening
  • 100 pieces included for large projects

1/4-20 x 1/2 in Button Head Cap Screws

This pack contains 100 alloy steel button head cap screws with a 1/4-20 UNC thread. They are fully threaded and measure 1/2 in length. The black oxide finish provides basic corrosion resistance. These fasteners suit general mechanical assembly and maintenance tasks.

Hex Socket Drive and Black Oxide Finish

Each screw uses a 5/32 in hex socket drive for secure installation with an Allen key. The button head profile sits lower than a standard socket cap head. The black oxide coating offers a dark appearance and mild protection against rust. The steel construction delivers reliable strength for everyday fastening.

Fully Threaded 1/4-20 UNC Specification

The thread diameter is 1/4 in with a coarse 20 threads per inch pitch. Thread length matches the full 1/2 in body length for maximum engagement. Head height measures 0.132 in for clearance planning. Buyers needing fine-thread or longer fasteners should select a different part.

How it compares

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

Price $11.99
Cheaper than about 84% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameKerr Lakeside
Product typeSocket
Size & build
Main materialHAWA

Questions about this item

What thread standard does the 1/4-20 UNC coarse thread follow, and what does it cap in practice?

The 1/4-20 UNC coarse thread follows the Unified National Coarse standard and caps at 20 threads per inch, providing a standard coarse pitch for general fastening applications.

What physical dimensions and drive size are needed for the 5/32 in hex socket to fit and mount properly?

The screw has a 1/4 in thread diameter, 1/2 in length, 0.132 in head height, and requires a 5/32 in hex key for the socket drive.

How is the fully threaded 1/2 in screw installed, and what step involving the 5/32 in hex drive do people often get wrong?

Insert the 5/32 in hex key fully into the socket drive, align the 1/4-20 threads, and turn clockwise; the common error is using a worn or undersized key that strips the socket.

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