NORD SI50 UNIVERSAL Worm Gearmotor
The NORD SI50 is a highly compact, versatile right-angle worm gearmotor from NORD DRIVESYSTEMS' UNIVERSAL SI Series[cite: 24]. Featuring a smooth, corrosion-resistant die-cast aluminum housing[cite: 24], the SI50 offers high single-stage reduction ratios, quiet operation, and washdown suitability for light to medium industrial processing[cite: 24]. Available in complete mounting configurations—including hollow shaft keyway (SI50A), B5 flange (SI50AF), B14 face flange (SI50AZ), shrink disc (SI50ASH), GRIPMAXX™ keyless bushing system (SI50AM), and nsd tupH™ sealed surface treatment[cite: 24]—it is extensively applied in food & beverage processing, bottling plants, packaging equipment, and light material handling conveyors[cite: 24].
Technical Specifications
| Model / Part Number | SI50 (UNIVERSAL Single-Stage Worm, Size 50 Aluminum Housing)[cite: 24] |
|---|---|
| Brand / Manufacturer | Getriebebau NORD GmbH & Co. KG[cite: 24] |
| Housing Construction | Smooth Washdown Aluminum Die-Cast Housing (SI/SMI) or Cast Iron UNICASE[cite: 24] |
| Compatible Motor Types | NORD IE1, IE2, IE3 Premium, and IE4 Super Premium AC Motors (Frame 63S to 180L)[cite: 24] |
| Rated Motor Power (kW) | 0.12 kW to 15 kW (0.75 kW Standard for SI50-80L/4)[cite: 24] |
| Maximum Torque Capacity | Up to 4,200 Nm (UNICASE Helical-Worm) / 180 Nm (SI50)[cite: 24] |
| Shaft & Mounting Form | Hollow Shaft (A/AH/AZ), Shrink Disc (ASH), GRIPMAXX™ (AM), Solid Shaft (V), Flange B5/B14[cite: 24] |
Documentation & Resources
NORD UNIVERSAL & UNICASE Worm Modular Architecture Matrix
Full-range modular configuration guide for NORD DRIVESYSTEMS right-angle worm gearboxes[cite: 24]. 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)[cite: 24] | SI 31 to SI 125 (8 Sizes)[cite: 24] | 0.12 kW - 15.0 kW / IEC Frame 63 to 180[cite: 24] | nsd tupH™ (Sealed Surface Conversion) |
| Smooth SMI Series (Hygienic Aluminum)[cite: 24] | SMI 31 to SMI 75 (5 Sizes)[cite: 24] | 0.12 kW - 4.0 kW / IEC Frame 63 to 112[cite: 24] | GRIPMAXX™ (Keyless Bushing System) |
| UNICASE 2-Stage Helical-Worm (Cast Iron)[cite: 24] | SK 02040 to SK 42125 (6 Sizes)[cite: 24] | 0.12 kW - 7.5 kW / IEC Frame 63 to 132[cite: 24] | ASH (Hollow Shaft Shrink Disc) |
| UNICASE Helical-Worm Stage (Cast Iron)[cite: 24] | SK 1S32 to SK 4S90 (4 Sizes)[cite: 24] | 0.12 kW - 5.5 kW / IEC Frame 63 to 132[cite: 24] | VL2 / VL3 (Heavy Agitator Bearings) |
| Double-Worm Compound Units (High Ratios)[cite: 24] | SI31/31 to SI125/63 (Double Worm)[cite: 24] | 0.12 kW - 1.5 kW / IEC Frame 63 to 90[cite: 24] | 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[cite: 24]. 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[cite: 24] | 1st Gen Aluminum Worm[cite: 24] | SI 31 / SI 40 / SI 50 SI Series[cite: 24] | 21 Nm - 180 Nm / 0.12 - 0.75 kW[cite: 24] | Direct 1-to-1 foot & shaft match. Enhanced washdown housing[cite: 24]. |
| SI 62 / SI 72 / SI 82[cite: 24] | 1st Gen Aluminum Worm[cite: 24] | SI 63 / SI 75 / SI 90 SI Series[cite: 24] | 260 Nm - 620 Nm / 0.25 - 5.5 kW[cite: 24] | Identical shaft centerline and mounting face. Drop-in replacement[cite: 24]. |
| SK 02050 / SK 12063[cite: 24] | Legacy UNICASE Helical-Worm[cite: 24] | SK 02050 / SK 12063 Current Standard[cite: 24] | 180 Nm - 420 Nm / 0.18 - 2.2 kW[cite: 24] | Preserves footprint & B5 flange. High primary helical stage efficiency[cite: 24]. |
| SK 32090 / SK 42125[cite: 24] | Legacy Heavy Helical-Worm[cite: 24] | SK 32090 / SK 42125 Current Standard[cite: 24] | 1,100 Nm - 3,000 Nm / 0.75 - 11 kW[cite: 24] | Direct drop-in. Accepts current NEMA C-face or IEC B5 motor adapters[cite: 24]. |
| Pure Worm Units (Low Efficiency)[cite: 24] | Standard Worm Drive[cite: 24] | SK 1S32 to SK 4S90 Helical-Worm Efficiency Upgrade[cite: 24] | Helical Primary Stage[cite: 24] | Helical primary stage improves overall efficiency by up to 20%[cite: 24]. |
Expert Selection & Retrofit Engineering Notes
When retrofitting an existing installation featuring older SI 42, SI 52, SK 02050, or competitor worm gearboxes[cite: 24], upgrading to UNIVERSAL SI or UNICASE helical-worm gearmotors ensures complete dimensional interchangeability while substantially increasing energy efficiency and seal longevity[cite: 24]. 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[cite: 24].
Core Benchmark Model Standard Configurations
- SI31-63L/4 (0.18 kW)[cite: 24]
- SI40-71L/4 (0.37 kW)[cite: 24]
- SI50-80L/4 (0.75 kW)[cite: 24]
- SI63-90L/4 (1.5 kW)[cite: 24]
- SI75-100L/4 (2.2 kW)[cite: 24]
- SI90-112M/4 (4.0 kW)[cite: 24]
- SI100-132M/4 (7.5 kW)[cite: 24]
- SMI40-71L/4 (0.37 kW)[cite: 24]
- SMI50-80L/4 (0.75 kW)[cite: 24]
- SMI63-90L/4 (1.5 kW)[cite: 24]
- SK 02050-80L/4 (0.75 kW)[cite: 24]
- SK 12063-90L/4 (1.5 kW)[cite: 24]
- SK 32090-100LA/4 (3.0 kW)[cite: 24]
- SK 1S32-71L/4 (0.37 kW)[cite: 24]
- SK 2S42-80L/4 (0.75 kW)[cite: 24]
- SK 3S52-90L/4 (1.5 kW)[cite: 24]
- SI50A-80L (Hollow Shaft)[cite: 24]
- SI63ASH-90L (Shrink Disc)[cite: 24]
- SMI50AM-80L (GRIPMAXX)[cite: 24]
- SI75AF-100L (B5 Flange)[cite: 24]
