Bolt Identification Chart - Komatsu D32E-1 Operation & Maintenance Manual

21. STANDARD TIGHTENING TORQUES
21.2 BOLT IDENTIFICATION CHART
TYPE/CLASS DESCRIPTION
HEAD MARKING
Type 5
Three radial lines on top and none on side of head. Medium carbon
Inch Thread
steel quenched and tempered.
0W
Type 5.2 Three radial lines on top and none on side of head. Low carbon boron
Inch Thread steel quenched and tempered.
0W
Type 8
Six radial lines on top and none on side of head. Medium carbon or
Inch Thread carbon alloy steel quenched and tempered.
0W
Type 8.2
Six radial lines on top and none on side of head. Low carbon boron
Inch Thread steel quenched and tempered.
0W
Class 5.8
Metric Thread
Marked on top or side of head. Low or medium carbon steel.
OF?
Class 8.8 Marked on top or side of head. Medium carbon or carbon alloy or low
Metric Thread
carbon boron steel quenched and tempered.
OF?
Class 9.8
Marked on top or
side
of head. Medium carbon or carbon alloy or low
Metric Thread carbon boron steel quenched and tempered.
OF?
Class 10.9 Marked on top or side of head. Medium carbon or carbon alloy or low
Metric Thread
carbon boron steel quenched and tempered.
QFF
Type 8R Six radial lines on head with type designation, none on sides. Medium
Inch Thread carbon or medium carbon alloy steel quenched and tempered.
a???
Type 8R
Six radial lines on head with type designation, none on sides. Low
Inch Thread carbon boron steel quenched and tempered.
0 W
Type 9
Six radial lines on head with type designation, none on sides. Medium
Inch Thread
carbon alloy steel quenched and tempered.
QW
Type 9R Six radial lines on head with type designation, none on sides. Medium
Inch Thread
carbon alloy steel quenched and tempered.
OF?
Class 10.9R
Marked on top or side of head. Medium carbon or carbon alloy steel
Metric Thread quenched and tempered. Q7z?
Class 10.9R
Marked on top or side of head and underlined. Low carbon boron steel
Metric Thread quenched and tempered.
Q=
Class 12.9 Marked on top or side of head. Medium carbon alloy steel quenched
Metric Thread and tempered.
0 Yz?
Class 12.9R
Marked on top or side of head. Medium carbon alloy steel quenched
Metric Thread and tempered.
3-15