High Torque Worm Gear Shaft for Gearboxes

Most High Torque Worm Gear Shaft for Gearboxes from Qimao Metal Manufacturer works fine on paper but fail when real torque hits. That is why we built this High Torque Worm Gear Shaft differently. It starts with 42CrMo4 or 20CrMnTi alloy steel, then gets either case hardened or through hardened depending on your load profile. The thread flanks reach 58–60 HRC while the core stays tough enough to absorb shock and twisting forces.

After heat treatment, we CNC grind the thread profile instead of leaving it rough hobbed. This gives you smooth flanks, accurate lead angle, and low friction against the worm wheel. The bearing journals and keyways are machined in the same setup to keep everything concentric within 0.02 mm. No vibration, no noise, just reliable torque transmission. You get a worm shaft that fits your gearbox and actually lasts under real working conditions.

For case hardened versions, we carburize at 930°C then quench. Core hardness ends up around 30–35 HRC, while thread flanks reach 58–60 HRC. For through hardened versions, we aim for 45–50 HRC throughout.

After hardening, we straighten the shaft if needed. Then we grind the thread profile, bearing journals, and keyway base. Thread accuracy meets grade 6 or 7 per DIN 3975. Surface roughness on the flanks is Ra 0.4 µm or better.

We add chamfers on all edges and drill center holes on both ends. Each shaft comes with a hardness report and a dimensional inspection sheet at no extra charge. You get what you pay for, and we do not hide defects.

Product Parameter (Specification)

Product Feature

1. Made from case hardened 20CrMnTi or through hardened 42CrMo4 steel. High surface hardness on thread flanks with a tough core that handles twisting forces. Cheap mild steel shafts deform under high torque loads.

2. Threads of High Torque Worm Gear Shaft for Gearboxes are CNC ground after heat treatment, not left rough hobbed. Grinding removes distortion and gives smooth flanks. Lower friction means less heat inside the gearbox and longer oil life. Your worm wheel also wears slower.

3. Bearing journals and keyways machined in the same clamping setup as the thread. Keeps everything concentric within 0.02 mm. Poor concentricity causes vibration and noise at full torque. We avoid that problem from the start.

4. Case depth controlled between 0.8 mm and 1.5 mm depending on module size. Too shallow and threads wear fast. Too deep and the core gets brittle. Our heat treat logs are saved for every batch.

5. Every shaft checked for straightness and runout before packing. We use a laser micrometer and dial indicators. If bent over 0.03 mm per 300 mm, it goes back to rework. No exceptions. Bent shafts ruin bearings.

Application

1. Industrial gearboxes for heavy conveyors – These run long hours under steady high torque. Our High Torque Worm Gear Shaft for Gearboxes keeps the thread profile intact and prevents heat buildup. No unexpected stops for replacement. Conveyor lines stay moving.

2. Machine tool feed drives – Precision matters here. The smooth ground thread gives you consistent positioning without backlash drift. Your CNC machine or milling table moves accurately even under heavy cutting loads.

3. Lift and hoist gearboxes – Safety is critical. The self-locking property of a single-start worm shaft holds the load when the motor stops. Hardened threads resist wear from frequent starts and stops at full rated torque.

4. Mixers and agitators – These face reversing loads and shock from thick materials. Our through hardened version survives twisting forces without cracking. The shaft keeps turning smoothly even when the mix gets stiff or lumpy.

5. Agricultural equipment drives – Dust, dirt, and temperature swings are normal here. A high torque worm shaft with sealed bearings handles these harsh conditions. You get reliable power transmission for grain augers or fertilizer spreaders without frequent rebuilds.

Production Details

1. Material for High Torque Worm Gear Shaft for Gearboxes is 20CrMnTi for case hardened versions or 42CrMo4 for through hardened.

2. Case depth runs 0.8 to 1.5 mm depending on module size. Thread accuracy meets grade 6 per DIN 3975.

3. Surface roughness on flanks is Ra 0.4 µm or better. Straightness is held to 0.03 mm per 300 mm.

4. Diameters available from 12 mm to 100 mm.

5. Modules from 1 to 8. Single-start or multi-start threads. Left-hand or right-hand orientation.

6. Bearing journals ground to h6 or g6 tolerance.

7. Keyways cut to DIN 6885 standard.

8. Each shaft gets checked with a laser micrometer and dial indicators before packing. Hardness test report and dimensional inspection sheet included.

9. Center holes drilled on both ends. All edges chamfered. Anti-rust oil applied and shrink wrapped for shipping.

10. Custom lengths available without mold fees.