Zeron 100 keys are super duplex stainless steel machine keys (UNS S32760 / Werkstoff 1.4501) used to lock rotating elements (gears, pulleys, couplings, impellers) onto shafts. Standard key forms: parallel keys per DIN 6885 / ISO 2491 (rectangular cross-section, the workhorse pattern), Woodruff keys per DIN 6888 (semi-circular profile for tapered shafts), and gib-head keys per DIN 6887 (with a hooked end for removal access).
Parallel keys (DIN 6885 / ISO 2491) · Woodruff keys (DIN 6888) · Gib-head keys (DIN 6887)
The corrosion case for super duplex keys: a key in a chloride-bearing environment (seawater pumps, marine winches, FGD damper drives, desalination motor couplings) corrodes at the keyway interface where moisture is trapped between key and shaft. Carbon steel and 304 keys pit and seize within months; 316L keys last longer but still corrode in continuous-immersion service. Zeron 100 keys carry the same PREN ≥ 40 super-duplex envelope as the matching shaft / coupling / impeller, so the keyway interface stays corrosion-stable for the equipment lifetime.
| Key type | Standard | Cross-section | Use case |
|---|---|---|---|
| Parallel key (square / rectangular) | DIN 6885A/B/C / ISO 2491 | Rectangular | Standard shaft-hub torque transfer; most common machine key |
| Woodruff key (semi-circular) | DIN 6888 / ASME B17.2 | Half-disc | Tapered shaft ends, light-duty couplings, automotive / pump shafts |
| Gib-head key | DIN 6887 / DIN 6886 | Tapered with hooked end | Removable key for shaft-end couplings; access for dismounting |
| Square taper key | DIN 6886 | Square tapered | Same as gib-head minus the hook |
Cross-section 5 × 5 mm (M5 shaft) up to 80 × 50 mm (large-shaft drive keys). Lengths cut-to-shaft per buyer drawing. Stock inventory at high-volume sizes for pump / motor shaft service (8×7, 10×8, 12×8, 16×10, 20×12, 25×14 mm).
| Service | Recommended key type |
|---|---|
| Seawater pump shaft-impeller key | Parallel key, SA |
| Marine winch drive shaft | Parallel key, FG (high torque) |
| FGD scrubber damper shaft | Parallel key, SA |
| Desalination booster pump motor coupling | Woodruff key, SA |
| Subsea ROV manipulator drive shaft | Parallel key, FLT |
| Removable couplings (frequent service) | Gib-head key, SA |
Send the spec (key type + cross-section + length + DIN/ISO ref + supply state + quantity) to info@torqbolt.com or +91-22-66157017 / WhatsApp.
