No. 6-40 UNF x 3/8" Countersunk Screw allen key

No. 6-40 UNF x 3/8" Countersunk Screw allen key

American Fine Thread UNF

Thread type: UNF (Unified National Fine)

Thread pitch: 40 threads per inch (40 TPI)

Standard: ASME/ANSI B18.3-2002

Material specification: ASTM A574

Hardness: Rockwell C 38–43 HRC

Thread class: Class 3A fit

Material: Heat-treated alloy steel, 1960 series

Similar to DIN 7991 (comparable design)

Dimensions:

Overall length including head: 3/8 inch = 9.53 mm

Thread diameter: 3.51 mm

Hex key size: 5/64 inch

Applications: Ideal for use in vehicles, motorcycles, boats, aircraft, and archery.

Tip: Suitable for compound and recurve bows, archery, sight mounts

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