STANDARD BOLT IDENTIFICATION MARKINGS
Bolts and Screws Medium Carbon Alloy Steel Quenched and Tempered 1⁄4 thru 1 189 105 000 115 000 133 000 SAE J429 Grade 8 ASTM A354 Grade BD No Grade Mark SAE J429 Grade 8 1 Studs Medium Carbon Alloy or SAE 1041 Modified Elevated Temperature Drawn Steel 1⁄4 thru 1 189 120 000 130 000 150 000 Bolts Screws 150 000 Alloy Steel Quenched and Tempered 1⁄4