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Box of 100 black oxide socket head cap screws .25-28 x 1.5 in

Kerr Lakeside

Kerr Lakeside 25F150KCS .25-28 x 1.5 in. Socket Head Cap Screw Black Oxide 100 Pieces

SKU CH-PPBY-WHC2B

1/4-28 UNF socket-head cap screws, 1.5 in long, black-oxide alloy steel, 100 pieces

  • Product typeSocket
  • Main materialHAWA
  • Fine-thread UNF precision for secure fastening
  • Black oxide finish resists corrosion in demanding environments
  • 3/16 in. hex socket drive enables high-torque installation
  • Partially threaded 1.5 in. length suits varied grip depths
  • 100-piece pack supplies volume for production runs

Kerr Lakeside Socket Cap Screws

These Kerr Lakeside socket head cap screws are alloy-steel fasteners with a black-oxide finish. They suit mechanical assemblies that require a 1/4-28 UNF thread and a hex-socket drive. Builders and technicians working on precision equipment will find them compatible with standard inch-series hardware. The pack contains one hundred pieces for production or maintenance use.

Thermals Noise and Power Draw

As passive metal fasteners these screws generate no heat and produce no audible noise during operation. They draw no electrical power and impose no thermal load on surrounding components. Their black-oxide coating provides mild corrosion resistance without affecting friction characteristics. Performance remains consistent across the operating envelope of the host assembly.

Build Integration

Each screw measures 1.5 inches long with a 0.25-inch head height and a 3/16-inch hex drive. The partially threaded shank leaves an unthreaded grip length for shear applications. A 1/4-28 UNF tap or matching nut is required for installation. The fine thread and alloy-steel grade suit high-preload joints where vibration resistance matters.

How it compares

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

Price $15.99
Cheaper than about 73% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameKerr Lakeside
Product typeSocket
Size & build
Main materialHAWA

Questions about this item

How do I install the 1/4-28 socket head cap screws and what size hex key is needed?

Use a 3/16 inch hex key to drive the hex socket head. Insert the screw into the tapped hole and turn clockwise until the head seats flush; the 1 inch thread length engages fully in a standard 1/4-28 thread.

Will the black oxide finish on these alloy steel screws need any maintenance or replacement over time?

The black oxide coating provides mild corrosion resistance but will wear in high-friction joints; inspect periodically and replace any screw showing rust or thread damage.

What is the first limit reached when these 1.5 inch screws are used in sustained vibration or load cycling?

The partially threaded design with 1 inch minimum thread engagement means the unthreaded shank can become a stress concentration point under repeated cyclic loading.

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