Bolts threads are determined by, 2x the diameter + ¼”, and have a small washer face under the head. ![]() GRADE 2: Low carbon hex head steel bolt, usually has no head markings. |
GRADE 5: Through hardened hex head steel bolt, denoted by a head marking of 3 lines. |
![]() GRADE 8: Through hardened hex head steel bolt and stronger than grade 5, denoted by a head marking of 6 lines. |
![]() STAINLESS: A hex head bolt, typically 18-8 (300 series stainless) corrosion resistant, denoted by a head marking of 2 lines. |
HEX TAP BOLT: Fully threaded hex bolts, no washer face under the head. |
CARRIAGE BOLT: A round head which has no drive, It does have a square or ribbed neck. |
![]() HEX LAG BOLT: A low carbon hex bolt with a wood screw thread. |