Use Conductive Fasteners for Electrical Grounding on All Cat Products {7553, 7556}
- Caterpillar Products:
- All
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| Illustration 1 | g03012597 |
Example of a bolt with a black coating that is a poor electrical conductor | |
To minimize damage from rust and corrosion, many fasteners have black coatings that resist electrical conductivity in addition to resisting corrosion. Do not use such fasteners for electrical terminals or electrical grounding.
Fasteners that provide good electrical conductivity have silver-colored zinc plating.
Direct contact between terminals or a terminal-to-ground boss is recommended. Refer to Illustration 2
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| Illustration 2 | g03012656 |
(1) Stud (2) Nut (3) Washer (4) Ring terminal (5) Boss | |
Table 1 lists some nuts and washers that are commonly used for electrical grounds. The low torque is recommended so that the ring terminals are not damaged.
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| Fastener | Size | Low Torque |
| 5C-2890 Nut | M6 | 6 ± 1 N·m (53 ± 8 lb in) |
| 1A-8912 Washer | ||
| 5C-7261 Nut | M8 | 15 ± 3 N·m (11 ± 2 lb ft) |
| 8F-7242 Washer | ||
| 8T-4133 Nut | M10 | 30 ± 7 N·m (22 ± 5 lb ft) |
| 7P-1695 Washer | ||
| 8T-4244 Nut | M12 | 50 ± 10 N·m (37 ± 7 lb ft) |
| 4B-4280 Washer |
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