Heat-treated, high carbon steel mainspring that is precision and center-less ground and is calibrated to meet or exceed ASTM Specification D2240-81.
Heat-treated, high carbon steel mainspring that is precision and center-less ground and is calibrated to meet or exceed ASTM Specification D2240-81.
Discontinued!
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Features
Test Block Features
| Accuracy | ±1 Point |
| Dimensions | 4 x 2.25 x 1.75" (10.2 x 5.7 x 4.4 cm) |
| Weight | 8 oz (227 g) |
| Shipping Weight | 3 lb (1.4 kg) |
| Accuracy | ±1 Point |
| Dimensions | 4 x 2.25 x 1.75" (10.2 x 5.7 x 4.4 cm) |
| Weight | 8 oz (227 g) |
| Shipping Weight | 3 lb (1.4 kg) |