Hex socket head cap screw P=3(Coarse Steel Trivalent white(Silver) 4 X 16 Pitch 0.7

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 M4
• Length under head (L): 16.0
• Coarse pitch: 0.7
• Head diameter (dk): Nominal 7 Max 7.22 Min 6.78
• Head height (k): Nominal 4 Min 3.82
• Hex socket width across flats (s): Nominal 3 Max 3.08 Min 3.02
• Hex socket depth (t): Min 2
• Flat washer (D x t): 10 x 0.8
• Spring washer (d): Max 7
• Spring washer (b x t): 1.4 x 1.0
• Incomplete thread section: Max 4.0
• Partial thread range: L55 and above
• Partial thread thread length: 40-44
• * Full thread thread length = L dimension - Incomplete thread length