ButtonHex socket head cap screw(Fine Steel Zinc plated(Silver) 12X30(P1.25 Pitch 1.75

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JIS B 1174
A hex socket button bolt characterized by its rounded head shape.
Also known as a button cap screw.
Compared to a hex socket head cap screw of the same size, the hex socket is smaller.
There are two types of button cap screws: the "3S Standard," an industry standard (association standard) that was introduced earlier, and the "JIS Standard," which was established later in accordance with ISO. The two types differ in head dimensions.
3S Standard (Manufacturers: Tokosya Metal SS, Gosho SS, Chubu Rashi, Kyokuto SS, Ansco (Maruko))
JIS Standard (Manufacturers: Nissan Neji, Ansco, Alps Seiko)
Button CAP Standard Comparison
Screw Pitch List

• Button cap screw coarse pitch
• Steel:
• Nominal diameter: M12
• Length under head (ℓ): 30.0
• Pitch: 1.25
• Head diameter (dk) nominal: 21 tolerance: 0, -0.5
• Head height (k) nominal: 7 tolerance: ±0.2
• Hex socket width across flats (s) nominal: 8 tolerance: +0.13, +0.04
• Hex socket depth (t) nominal: 4.9 tolerance: ±0.2
• Neck diameter (da) max: 14.2