Hardware Tooling Interfaces

Also Known As: Die Spec

Hardware presses use various combinations of set-screw shaft collars, threading, and other mechanisms to hold hardware die sets in place.

M6 and 12mm

Buckleguy calls this “M6 European” or “East Coast”.

1/4-24 and 12mm

1/4-24 threading is non-standard, falling between standardized SAE 1/4-20 UNC and 1/4-28 UNF. It’s sometimes written “1/4-24 UNS”, with “S” for “Special”, but even then the dimensions and tolerances vary. You won’t find 1/4-24 fasteners in hardware stores, even in the USA.

Used by many twist presses from Italy, such as those from SPS. Also used on older USMC S 5 and S 115 eyeleting machines.

3/8″ Shanks

Buckleguy calls this “West Coast”.

Examples:

Buckleguy

See Also: BG 180

USMC Model C

USMC Models S-260 and S-261

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