ButtonHex socket head cap screw(SSS(Coarse Stainless steel Unplated 5X55X55 Pitch 0.8

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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 association standard (union 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: Toko Sha Kinzoku SS, Gogo SS, Chubu Raishi, Kyokuto SS)
JIS Standard (Manufacturers: Nissan Neji, Ansco, Alps Seiko)
Button CAP Standard Comparison　Screw Pitch List

• Button cap bolt (SSS) Coarse pitch
• Nominal diameter (d) M5
• Length under head (ℓ) 55.0 Tolerance ±0.5
• Pitch 0.8
• Hex socket width across flats (s) Nominal 3 Tolerance +0.08,+0.02
• ※Hex socket depth (t) Nominal 1.6 or greater
• Head diameter (dk) Nominal Φ9.5 Tolerance 0,-0.4
• Head height (k) Nominal 3.4 Tolerance ±0.15
• Screw point Chamfered point
• ※Hex socket depth is per manufacturer standard.