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Black oxide alloy steel flat head socket cap screws, 5/8-11 thread, 2.5 inch length, 25 pack

Kerr Lakeside

Kerr Lakeside 62C250KFC .63 5/8-11 x 2.5 in Flat Head Socket Cap Screw Alloy Steel Black Oxide 25 Pack

SKU CH-VE8B-TTFKN

Pack of 25 alloy-steel flat-head socket cap screws, 5/8-11 thread by 2.5 in long, black oxide finish, ASME B18.3 compliant

  • Product typeSocket
  • Main materialHAWA
  • Alloy steel construction delivers high tensile strength for demanding fastening tasks
  • Black oxide finish provides corrosion resistance and reduced glare in workshop environments
  • Fully threaded 2.5 in shank ensures maximum grip throughout the entire joint depth
  • 82-degree countersink angle allows flush seating in standard flat-head counterbores
  • Pack of 25 pieces supplies enough hardware for multiple assembly or repair jobs

Flat-head socket cap screw, 5/8-11 thread

This pack contains twenty-five alloy-steel flat-head socket cap screws with a black oxide finish. Each fastener measures 2.5 inches long and is fully threaded to the head. The 5/8-11 UNC thread and 3/8-inch socket drive suit structural and machine assemblies where a flush countersunk seat is required.

5/8-11 UNC thread with 3/8-inch socket drive

The thread size is 5/8 inch diameter, 11 threads per inch, conforming to ASME B18.3 dimensional standards. The 3/8-inch hex socket drive provides positive engagement for installation and removal. An 82-degree countersink angle matches standard flat-head seating, and the head diameter of 1.188 inches distributes clamping load across the joint face.

Alloy steel with black oxide finish

Alloy steel construction delivers high tensile strength for load-bearing joints. The black oxide coating adds mild corrosion resistance and reduces light reflection without changing critical dimensions. In normal use the screws run cool and silent; power draw applies only to the driving tool, not to the fasteners themselves.

How it compares

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

Price $39.99
Pricier than about 61% 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 does the 5/8-11 thread size mean when I install these screws?

The 5/8-11 designation indicates a 5/8 inch major diameter with 11 threads per inch, giving a coarse thread pitch suited for alloy steel fasteners in structural joints.

How does the 3/8 inch socket drive size limit the torque I can apply?

A 3/8 inch hex socket drive caps practical torque below what a 1/2 inch drive can deliver, so final tightening should stay within the alloy steel proof load for this drive size.

Will the 1.188 inch head diameter sit flush in an 82 degree countersink?

Yes, the flat head measures 1.188 inch diameter with a matching 82 degree countersink angle per ASME B18.3, so it seats flush when the hole is cut to that standard.

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