Hex socket head cap screw P=3(Coarse Stainless steel Unplated 5 X 12 Pitch 0.8

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 M5
• Length under head (L): 12.0
• Coarse pitch: 0.8
• Head diameter (dk): Nominal 8.5 Max 8.72 Min 8.28
• Head height (k): Nominal 5 Min 4.82
• Hex socket width across flats (s): Nominal 4 Max 4.095 Min 4.02
• Hex socket depth (t): Min 2.5
• Flat washer (D x t): 12 x 0.8
• Spring washer (d): Max 8.5
• Spring washer (b x t): 1.7 x 1.3
• Incomplete thread section: Max 4.8
• Partial thread range: L55 and above
• Partial thread thread length: 40~44
• *Full thread thread length = L dimension - Incomplete thread length