Square head bolt square bolt lengthened four corner T screw non-standard bolt manufacturers customized
| Standard | Size | Grade | Surafce Treatment |
| EN14399-10 | M16-M30 | 0.9HRC | Black / HDG / Dacrome / Mechanical |
| ASTM F1852 | 1/2”- 11/8” | A325 TC | Black / HDG / Dacrome / Mechanical |
| ASTM F2280 | 1/2”- 11/8” | A490TC | Black / Dacrome |
| GB/T3632-2008 | M16-M30 | 10.9S | 10.9SBlack / Dacrome |
| JIS II 09-1996 | M12-M30 | S10T | Black / HDG / Dacrome / Mechanical |
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