FOREWORD STANDARD TIGHTENING TORQUE 12 ALTERNATIVE FASTENERS 00 BOLT IDENTIFICATION CHART 00 00-12 PC300LL-6 TYPE/CLASS DESCRIPTION HEAD MARK Type 5 Inch Thread Three radial lines on top and none on side of head. Medium carbon steel quenched and tempered. Type 5.2 Inch Thread Three radial lines on top and none on side of head. Low carbon boron steel quenched and tempered. Type 8 Inch Thread Six radial lines on top and none on side of head. Medium carbon or carbon alloy steel quenched and tempered. Type 8.2 Inch Thread Six radial lines on top and none on side of head. Low carbon boron steel quenched and tempered. Class 5.8 Metric Thread Marked on top or side of head.
Low or medium carbon steel. Class 8.8 Metric Thread Marked on top or side of head. Medium carbon or carbon alloy or low carbon boron steel quenched and tempered. Class 9.8 Metric Thread Marked on top or side of head. Medium carbon or carbon alloy or low carbon boron steel quenched and tempered. Class 10.9 Metric Thread Marked on top or side of head. Medium carbon or carbon alloy or low carbon boron steel quenched and tempered. Type 8R Inch Thread Six radial lines on head with type designation, none on sides. Medium carbon or medium carbon alloy steel quenched and tempered. Type 8R Inch Thread Six radial lines on head with type designation, none on sides.
Low carbon boron steel quenched and tempered. Type 9 Inch Thread Six radial lines on head with type designation, none on sides. Medium carbon alloy steel quenched and tempered. Type 9R Inch Thread Six radial lines on head with type designation, none on sides. Medium carbon alloy steel quenched and tempered. Class 10.9R Metric Thread Marked on top or side of head. Medium carbon or carbon alloy steel quenched and tempered. Class 10.9R Metric Thread Marked on top or side of head and underlined. Low carbon boron steel quenched and tempered. Class 12.9 Metric Thread Marked on top or side of head. Medium carbon alloy steel quenched and tempered.
Class 12.9R Metric Thread Marked on top or side of head. Medium carbon alloy steel quenched and tempered.