GMC 1989 Light Duty Truck Repair Manual page 14

OA-8 GENERAL INFORMATION
Passenger Van
Cargo Van
Figure 12— M Models
1. G rade 2 (GM 200-M)
2. G rade 5 (GM 280-M)
3. G rade 7 (GM 290-M)
4. G rade 8 (GM 300-M)
5. M a n u fa c tu re r's Id e n tific a tio n
6. N u t S tre n g th Id e n tific a tio n
7. Id e n tific a tio n M arks (P o s id riv S crew Head)
Figure 13— Bolt and N ut Id en tificatio n
1. C u s to m a ry B o lt— 1/4-20
2. M e tric B o lt— M6.0x1
A. 1 /4-inch
B. 6 m m
C. 20 T hre a d s Per Inch
D. 1 T hread Per M illim e te r
B-09261
T - In te rn a l D rive
E - E x te rn a l D rive
F -006 95
Figure 15— Six Lobed S ocket Head Fasteners
(25.4 T hre a d s Per Inch)
Figure 14— Thread Notation
F -007 05
B-02221