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Box of 25 black oxide alloy steel socket head cap screws 3/4-10 x 2.25 in

Kerr Lakeside

Kerr Lakeside 75C225KCS 3/4-10 x 2.25 in. Socket Head Cap Screw Alloy Steel Black Oxide 25 Pack

SKU CH-3ADR-VCNFC

Alloy steel socket head cap screws, 3/4-10 UNC coarse thread, 2.25 in. full-thread length, black oxide finish, RC 38-43 hardness, 170,000 lbs tensile strength, 25-piece pack

  • Meets ASTM A574 and ANSI B18.3 standards for reliable structural fastening
  • Alloy steel hardened to RC 38-43 delivers 180,000 psi minimum tensile strength
  • Black oxide finish resists corrosion while maintaining precise socket drive engagement
  • Full 2.25 inch thread length provides maximum grip in deep-hole applications
  • 25-piece pack weighs 9.83 lbs for efficient bulk inventory management

Industrial Fasteners for Heavy Assembly

The Kerr Lakeside 75C225KCS is a pack of 25 socket head cap screws made from alloy steel with a black oxide finish. Each screw measures 3/4-10 by 2.25 inches with a coarse UNC thread and full thread length. They are designed for structural fastening where high tensile strength is required.

Hardness and Strength in Service

Heat treatment delivers a Rockwell hardness of RC 38-43 and a minimum tensile strength of 180000 psi. The alloy steel construction resists stretching and shear loads under torque. Black oxide provides mild corrosion resistance and reduces glare during installation.

170000 lb Tensile Rating Decides Fit

With a tensile strength of 170000 lbs, these screws suit applications demanding verified clamp force per ASTM A574 and ANSI B18.3. Buyers needing a lower strength class or a different thread pitch should select an alternative grade.

How it compares

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

Price $50.99
Pricier than about 68% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameProspect Fastener

Questions about this item

How do I install the 3/4-10 x 2.25 in. socket head cap screw and what step is often missed?

Use a hex key to drive the socket head; the step often missed is verifying the internal thread is clean UNC 10 pitch so the full 2.25 in. thread engages without cross-threading.

What maintenance or replacement will the alloy steel black oxide screws need later?

Inspect the black oxide finish for wear or corrosion; replace any screw showing thread damage or loss of the Rockwell 38-43 hardness range to maintain the 170000 lbs tensile rating.

What limit appears first under sustained load on these 25-piece pack fasteners?

The 170000 lbs minimum tensile strength is the limiting factor; sustained tension approaching this value risks permanent stretch of the alloy steel shank.

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