21-000A (+) Tapping Type B1 Upset
Model: 21-000A
Dia range:M5～M6
Length range:12～20
Iron (or standard).
Zinc blue cr6+, Zinc yellow cr6+, Trivalent zinc cr+3 color white, Trivalent zinc cr+3 color black, Nickel, Zinc black, Dacrotized.
| Thread Nominal Diameter | 5 | 6 | ||
|---|---|---|---|---|
| Width Across Flats (S) | Standard Dimension | 8.0 | 10.0 | |
| Tolerance | 0 -0.2 | |||
| Height (k) | Standard Dimension | 3.0 | 3.5 | |
| Tolerance | ±0.1 | ±0.15 | ||
| Cross Slot | m | Reference | 4.5 | 6.3 |
| Q | Maximum | 2.33 | 2.86 | |
| Minimum | 1.80 | 2.30 | ||
| Cross Slot Number | 2 | 3 | ||
| d | Maximum | 5.00 | 6.00 | |
| Minimum | 4.85 | 5.85 | ||
| Thread Pitch Count per 25.4mm | 16 | 14 | ||
