Hex socket head cap screw P=3(Coarse Steel Trivalent black(Black) 6 X 25 Pitch 1.0

This is a bolt with a hexagonal socket in a cylindrical head. Tightening is performed using a hex key (Allen wrench).
In most cases, it is used without a nut. It is also known as a cap screw or socket screw.
When fastening a hex bolt, a wrench requires working space, whereas a hex key does not.

Cap Bolt　
Hex Socket Head Cap Screw Encyclopedia
Cap Bolt　P=3

• Hex socket head cap screw P=3 Coarse pitch
• P=3 (With spring washer + JIS flat washer)
• Nominal thread diameter M6
• Length under head (L) 25.0
• Coarse pitch 1.0
• Head diameter (dk) Nominal 10 Max 10.22 Min 9.78
• Head height (k) Nominal 6 Min 5.7
• Hex socket width across flats (s) Nominal 5 Max 5.14 Min 5.02
• Hex socket depth (t) Min 3
• Flat washer (D x t) 13 x 1.0
• Spring washer (d) Max 11.4
• Spring washer (b x t) 2.7 x 1.5
• Incomplete thread section Max 5.7
• Partial thread range L55 or more
• Partial thread Thread length 40-44
• *Full thread Thread length = L dimension - Incomplete thread length