Malleable cast iron backnut (Recessed) is hexagonal nuts with female threaded connection, and it is used to tighten nipple or other pipe joint, so to avoid slippage.
Available size
| Size | A (mm) | Ref. No. |
|---|---|---|
| 1/2″ / DN15 / 21.3mm | 7.9 | M3303 (UL/FM) |
| 3/4″ / DN20 / 26.9mm | 8.6 | M3304 (UL/FM) |
| 1″ / DN25 / 33.7mm | 9.7 | M3305 (UL/FM) |
| 1-1/4″ / DN32 / 42.4mm | 10.7 | M3306 (UL/FM) |
| 1-1/2″ / DN40 / 48.3mm | 11.9 | M3307 (UL/FM) |
| 2″ / DN50 / 60.3mm | 13.5 | M3308 (UL/FM) |
| 4″ / DN100 / 114.3mm | 20.3 | M3311 (UL/FM) |
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