NORD SI50 UNIVERSAL Worm Gearmotor
The NORD SI50 is a highly compact, versatile right-angle worm gearmotor from NORD DRIVESYSTEMS' UNIVERSAL SI Series. Featuring a smooth, corrosion-resistant die-cast aluminum housing, the SI50 offers high single-stage reduction ratios, quiet operation, and washdown suitability for light to medium industrial processing. Available in complete mounting configurationsâincluding hollow shaft keyway (SI50A), B5 flange (SI50AF), B14 face flange (SI50AZ), shrink disc (SI50ASH), GRIPMAXX⢠keyless bushing system (SI50AM), and nsd tupH⢠sealed surface treatmentâit is extensively applied in food & beverage processing, bottling plants, packaging equipment, and light material handling conveyors.
Technical Specifications
| Model / Part Number | SI50 (UNIVERSAL Single-Stage Worm, Size 50 Aluminum Housing) |
|---|---|
| Brand / Manufacturer | Getriebebau NORD GmbH & Co. KG |
| Housing Construction | Smooth Washdown Aluminum Die-Cast Housing (SI/SMI) or Cast Iron UNICASE |
| Compatible Motor Types | NORD IE1, IE2, IE3 Premium, and IE4 Super Premium AC Motors (Frame 63S to 180L) |
| Rated Motor Power (kW) | 0.12 kW to 15 kW (0.75 kW Standard for SI50-80L/4) |
| Maximum Torque Capacity | Up to 4,200 Nm (UNICASE Helical-Worm) / 180 Nm (SI50) |
| Shaft & Mounting Form | Hollow Shaft (A/AH/AZ), Shrink Disc (ASH), GRIPMAXX⢠(AM), Solid Shaft (V), Flange B5/B14 |
Documentation & Resources
NORD UNIVERSAL & UNICASE Worm Modular Architecture Matrix
Full-range modular configuration guide for NORD DRIVESYSTEMS right-angle worm gearboxes. Review supported housing materials, stage designs, shaft connection options, and surface treatment executions:
| Gear Unit Series & Housing Type | Frame Sizes Covered | Matched Motor Power / Frame Sizes | Optional Factory Features & Protection |
|---|---|---|---|
| UNIVERSAL SI Series (Modular Aluminum) | SI 31 to SI 125 (8 Sizes) | 0.12 kW - 15.0 kW / IEC Frame 63 to 180 | nsd tupH⢠(Sealed Surface Conversion) |
| Smooth SMI Series (Hygienic Aluminum) | SMI 31 to SMI 75 (5 Sizes) | 0.12 kW - 4.0 kW / IEC Frame 63 to 112 | GRIPMAXX⢠(Keyless Bushing System) |
| UNICASE 2-Stage Helical-Worm (Cast Iron) | SK 02040 to SK 42125 (6 Sizes) | 0.12 kW - 7.5 kW / IEC Frame 63 to 132 | ASH (Hollow Shaft Shrink Disc) |
| UNICASE Helical-Worm Stage (Cast Iron) | SK 1S32 to SK 4S90 (4 Sizes) | 0.12 kW - 5.5 kW / IEC Frame 63 to 132 | VL2 / VL3 (Heavy Agitator Bearings) |
| Double-Worm Compound Units (High Ratios) | SI31/31 to SI125/63 (Double Worm) | 0.12 kW - 1.5 kW / IEC Frame 63 to 90 | SCP (Screw Conveyor Package Adapter) |
Legacy NORD Worm Replacement & High-Efficiency IE3/IE4 Upgrade Guide
Older generation NORD right-angle worm gearboxes installed on production lines can be directly replaced with current UNIVERSAL SI/SMI or UNICASE helical-worm gearmotors. Refer to the cross-reference mapping below for 1-to-1 retrofitting:
| Legacy NORD Model / Code | Gearbox Type | Current UNIVERSAL SI / UNICASE Equivalent | Rated Torque / Power | Mechanical Fit & Retrofit Engineering Notes |
|---|---|---|---|---|
| SI 32 / SI 42 / SI 52 | 1st Gen Aluminum Worm | SI 31 / SI 40 / SI 50 SI Series | 21 Nm - 180 Nm / 0.12 - 0.75 kW | Direct 1-to-1 foot & shaft match. Enhanced washdown housing. |
| SI 62 / SI 72 / SI 82 | 1st Gen Aluminum Worm | SI 63 / SI 75 / SI 90 SI Series | 260 Nm - 620 Nm / 0.25 - 5.5 kW | Identical shaft centerline and mounting face. Drop-in replacement. |
| SK 02050 / SK 12063 | Legacy UNICASE Helical-Worm | SK 02050 / SK 12063 Current Standard | 180 Nm - 420 Nm / 0.18 - 2.2 kW | Preserves footprint & B5 flange. High primary helical stage efficiency. |
| SK 32090 / SK 42125 | Legacy Heavy Helical-Worm | SK 32090 / SK 42125 Current Standard | 1,100 Nm - 3,000 Nm / 0.75 - 11 kW | Direct drop-in. Accepts current NEMA C-face or IEC B5 motor adapters. |
| Pure Worm Units (Low Efficiency) | Standard Worm Drive | SK 1S32 to SK 4S90 Helical-Worm Efficiency Upgrade | Helical Primary Stage | Helical primary stage improves overall efficiency by up to 20%. |
Expert Selection & Retrofit Engineering Notes
When retrofitting an existing installation featuring older SI 42, SI 52, SK 02050, or competitor worm gearboxes, upgrading to UNIVERSAL SI or UNICASE helical-worm gearmotors ensures complete dimensional interchangeability while substantially increasing energy efficiency and seal longevity. Simply provide us with your existing NORD serial number or nameplate code, and our engineering team will deliver a 100% compliant replacement specification and proposal.
Core Benchmark Model Standard Configurations
- SI31-63L/4 (0.18 kW)
- SI40-71L/4 (0.37 kW)
- SI50-80L/4 (0.75 kW)
- SI63-90L/4 (1.5 kW)
- SI75-100L/4 (2.2 kW)
- SI90-112M/4 (4.0 kW)
- SI100-132M/4 (7.5 kW)
- SMI40-71L/4 (0.37 kW)
- SMI50-80L/4 (0.75 kW)
- SMI63-90L/4 (1.5 kW)
- SK 02050-80L/4 (0.75 kW)
- SK 12063-90L/4 (1.5 kW)
- SK 32090-100LA/4 (3.0 kW)
- SK 1S32-71L/4 (0.37 kW)
- SK 2S42-80L/4 (0.75 kW)
- SK 3S52-90L/4 (1.5 kW)
- SI50A-80L (Hollow Shaft)
- SI63ASH-90L (Shrink Disc)
- SMI50AM-80L (GRIPMAXX)
- SI75AF-100L (B5 Flange)
