NORD SK 7207 MAXXDRIVE® H Industrial Helical Gear Unit
The NORD SK 7207 is a heavy-duty, 2-stage parallel shaft industrial helical gearbox from NORD DRIVESYSTEMS' flagship MAXXDRIVE® H Series[cite: 22]. Engineered with NORD's single-piece UNICASE cast iron block housing[cite: 22], the SK 7207 delivers exceptional thermal dissipation capacity, extreme radial and axial load tolerance, and a nominal output torque capacity of 48,000 Nm[cite: 22]. Covering 11 frame sizes from SK 5207 to SK 11407 (15,000 Nm to 282,000 Nm)[cite: 22], MAXXDRIVE® H units support solid output shafts (V), hollow shafts with keyway (A) or shrink disc (S), B5 output flanges (F), torque arms (G), swing bases (SB), cooling fans, heat exchangers, mechanical backstops (RLS), and auxiliary maintenance drives[cite: 22]. They are heavily specified in mining conveyors, bucket wheel excavators, crushers, agitators, mixers, crane hoists, port cranes, and steel rolling mills[cite: 22].
Technical Specifications
| Model / Part Number | SK 7207 (2-Stage Helical, Size 7 Industrial Unit)[cite: 22] |
|---|---|
| Brand / Manufacturer | Getriebebau NORD GmbH & Co. KG[cite: 22] |
| Housing Construction | UNICASE Single-Piece Heavy Cast Iron Housing (GJL-200 / GJS-400)[cite: 22] |
| Nominal Torque Capacity | 48,000 Nm (SK 7207) / 15,000 Nm to 282,000 Nm (Full Series Range)[cite: 22] |
| Motor Input Options | IEC B5 Motor Adapters (132 to 355), NEMA C-Face Adapters, Free Input Shafts (W)[cite: 22] |
| Ratio Range (i) | 2-Stage: 8.00 to 30.00 | 3-Stage: 28.00 to 125.00 | 4-Stage: 112.00 to 500.00+[cite: 22] |
| Shaft & Mounting Executions | Solid Shaft (V), Hollow Shaft Keyway (A) / Shrink Disc (S), Flange B5 (F), Torque Arm (G), Swing Base (SB)[cite: 22] |
Documentation & Resources
NORD MAXXDRIVE® H Series Modular Architecture Matrix
Complete structural layout guide for NORD DRIVESYSTEMS MAXXDRIVE® H parallel shaft industrial gearboxes[cite: 22]. Review reduction stages, shaft options, mounting configurations, and auxiliary thermal accessories:
| Gear Unit Series & Reduction Stages | Frame Sizes Covered | Nominal Torque Output (kNm) | Standard Factory Accessories & Packages |
|---|---|---|---|
| MAXXDRIVE® H 2-Stage Helical[cite: 22] | SK 5207 to SK 11207 (7 Sizes)[cite: 22] | 15.0 kNm - 282.0 kNm[cite: 22] | /Fan-Rad (Radial Cooling Fan) |
| MAXXDRIVE® H 3-Stage Helical[cite: 22] | SK 5307 to SK 11307 (7 Sizes)[cite: 22] | 15.0 kNm - 282.0 kNm[cite: 22] | /Cool-W (Water/Oil Heat Exchanger) |
| MAXXDRIVE® H 4-Stage Helical[cite: 22] | SK 5407 to SK 11407 (7 Sizes)[cite: 22] | 15.0 kNm - 282.0 kNm[cite: 22] | /RLS (Mechanical Backstop) |
| Hollow Shaft Shrink Disc (S/SH)[cite: 22] | Sizes 5 to 11 (All Frame Sizes)[cite: 22] | 15.0 kNm - 282.0 kNm[cite: 22] | /AUX (Inching / Maintenance Drive) |
| Swing Base Assemblies (SB)[cite: 22] | Sizes 5 to 11 (Complete Drive Packages)[cite: 22] | 15.0 kNm - 282.0 kNm[cite: 22] | /Fl-Filter (Oil Filter & Heater) |
Legacy Industrial Gearbox Replacement & MAXXDRIVE® H Upgrade Guide
Obsolete heavy industrial gearboxes installed on cement, mining, and bulk handling systems can be directly replaced with current MAXXDRIVE® H Series helical units[cite: 22]. Refer to the cross-reference mapping below for 1-to-1 retrofitting:
| Legacy Industrial Gearbox Code | Original Gearbox Type | Current MAXXDRIVE® H Equivalent | MAXXDRIVE Torque Rating | Mechanical Fit & Retrofit Engineering Notes |
|---|---|---|---|---|
| SK 5000 / SK 5207 Parallel[cite: 22] | 1st Gen Industrial Helical[cite: 22] | SK 5207 / SK 5307 / SK 5407 MAXXDRIVE H[cite: 22] | 15,000 Nm[cite: 22] | Direct shaft height & footprint match. Upgraded thermal capacity[cite: 22]. |
| SK 6000 / SK 6207 Parallel[cite: 22] | 1st Gen Industrial Helical[cite: 22] | SK 6207 / SK 6307 / SK 6407 MAXXDRIVE H[cite: 22] | 24,000 Nm[cite: 22] | Identical shaft diameter & keyway specs. Drop-in replacement[cite: 22]. |
| SK 7000 / SK 7207 Parallel[cite: 22] | 1st Gen Industrial Helical[cite: 22] | SK 7207 / SK 7307 / SK 7407 MAXXDRIVE H[cite: 22] | 48,000 Nm[cite: 22] | Direct replacement for heavy conveyor & mill drives[cite: 22]. |
| SK 8000 / SK 8207 Parallel[cite: 22] | 1st Gen Industrial Helical[cite: 22] | SK 8207 / SK 8307 / SK 8407 MAXXDRIVE H[cite: 22] | 75,000 Nm[cite: 22] | Preserves base mounting bolt pattern. Accepts IEC/NEMA adapters[cite: 22]. |
| SK 9000 to SK 11000 Series[cite: 22] | 1st Gen Ultra Heavy Helical[cite: 22] | SK 9207 to SK 11407 MAXXDRIVE H[cite: 22] | 112,000 - 282,000 Nm[cite: 22] | Modular swing base & cooling packages ensure 1-to-1 retrofit[cite: 22]. |
Expert Selection & Retrofit Engineering Notes
When retrofitting an existing application featuring older SK 5207, SK 7207, or competitor industrial gearboxes[cite: 22], upgrading to MAXXDRIVE® H UNICASE block housing gear units ensures complete dimensional compatibility while offering significantly higher thermal ratings and lower maintenance down-time. Simply supply us with your existing NORD serial number or nameplate data, and our engineering team will provide a 100% compliant replacement specification and proposal.
Core Benchmark Model Standard Configurations
- SK 5207V-IEC180 (15 kNm)[cite: 22]
- SK 6207V-IEC200 (24 kNm)[cite: 22]
- SK 7207V-IEC280 (48 kNm)[cite: 22]
- SK 8207V-IEC315 (75 kNm)[cite: 22]
- SK 9207V-IEC315 (112 kNm)[cite: 22]
- SK 10207V-IEC355 (175 kNm)[cite: 22]
- SK 11207V-IEC400 (282 kNm)[cite: 22]
- SK 5307V-IEC132 (15 kNm)[cite: 22]
- SK 7307V-IEC200 (48 kNm)[cite: 22]
- SK 9307V-IEC250 (112 kNm)[cite: 22]
- SK 5207A Hollow Shaft[cite: 22]
- SK 7207S Shrink Disc[cite: 22]
- SK 8207F Output Flange[cite: 22]
- SK 9207G Torque Arm[cite: 22]
- SK 7207SB Swing Base[cite: 22]
- SK 8207-RLS Backstop[cite: 22]
- SK 5207-Fan-Rad Cooling[cite: 22]
- SK 7207-Cool-W Water[cite: 22]
- SK 9207-AUX Inching[cite: 22]
- SK 10207-Pump Lubrication[cite: 22]
