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NM Series Cast Iron Spider Flexible Coupling – Quick Release, Rubber Element for Pumps & Motors
Model Number
Check below, custom
NM-50
NM-67
NM-82
NM-97
NM-112
NM-128
NM-148
NM-168
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
NM Series Cast Iron Spider Flexible Coupling – Quick Release, Rubber Element for Pumps & Motors
Factory direct | Precision cast iron hubs | Natural rubber spider element | 125 kg·m max torque | 45 kW / 60 HP motor capacity | 7–75 mm shaft diameter range | H7 precision bore | Quick release design | No lubrication required | OEM/ODM/OBM
The Apexcoupling NM Series is a heavy-duty cast iron spider flexible coupling (Normex type / jaw coupling) designed for reliable power transmission in pump, motor, compressor, and general industrial applications. Featuring precision cast iron hubs meeting GB9439 standards and a natural rubber inner ring (spider) , this coupling delivers excellent vibration damping, shock absorption, and misalignment compensation. The quick release design allows for fast installation and maintenance without special tools. With H7 precision bore and a 7–75 mm shaft diameter range, the NM Series offers reliable, maintenance-free service for light, medium, and heavy-duty drives up to 60 HP / 45 kW .
✅ Cast iron hubs – precision cast, GB9439 standard, break-resistant. Natural rubber spider – cushions vibration, absorbs shock. Quick release – no special tools required. Maintenance-free – no lubrication needed.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | Apexcoupling |
| Model Series | NM (Normex / Spider Flexible Coupling) |
| Standard | GB9439 cast iron standard |
| Type | Flexible / Jaw / Spider |
| Hub Material | Precision cast iron (GB9439) |
| Spider Material | Natural rubber – high elasticity, shock-absorbing |
| Surface Treatment | Painted (spray paint) – corrosion-resistant |
| Fastening Method | Keyway + set screw |
| Max. Torque | 125 kg·m (approx. 1225 N·m) |
| Adaptive Motor Power | Within 60 HP / 45 kW |
| Shaft Diameter Range | 7 – 75 mm |
| Operating Temperature | -30°C to +100°C (natural rubber) |
| Lubrication | None required – maintenance-free |
| Standard or Nonstandard | Standard with OEM/ODM/OBM support |
| Customized support | OEM, ODM, OBM |
| Applicable Industries | Pumps, motors, compressors, fans, conveyors, food & beverage, printing, construction, energy & mining |
| Warranty | 1 Year |
| Place of Origin | Guangdong, China |
🔧 Custom bores, keyways, hexagon/square holes, and special spider materials available. Contact us with your specifications.
NM Series – Model Range & Specifications
| Model | OD (D) | Hub Dia. (D1) | Bore Range (d) | Rated Torque (N·m) | Max Speed (rpm) | Length (L) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| NM50 | 50 | 33 | 7 – 19 | 1.3 | 13500 | 51.5 | 0.48 |
| NM67 | 67 | 46 | 8 – 28 | 2.2 | 10000 | 62 | 1.02 |
| NM82 | 82 | 53 | 10 – 32 | 5.0 | 8000 | 82 | 1.88 |
| NM97 | 97 | 69 | 12 – 42 | 10.5 | 7000 | 102 | 3.54 |
| NM112 | 112 | 79 | 14 – 48 | 16.7 | 6000 | 122.5 | 5.40 |
| NM128 | 128 | 90 | 18 – 55 | 26.7 | 5000 | 142.5 | 8.10 |
| NM148 | 148 | 107 | 22 – 65 | 41.7 | 4500 | 162.5 | 13.50 |
| NM168 | 168 | 124 | 28 – 75 | 69.5 | 4000 | 174.5 | 19.30 |
| NM194 | 194 | 140 | 32 – 85 | 112.0 | 3500 | 202.5 | 26.30 |
| NM214 | 214 | 158 | 45 – 95 | 167.0 | 3000 | 222 | 35.70 |
📐 Custom bores available – add “K” for keyway, “F” for hexagon hole, “S” for square hole, “H” for spline hole. Contact us for complete dimensional data.
Product Structure
Two Cast Iron Convex Claw Hubs – Precision cast to GB9439 standards, robust and durable, painted finish .
Natural Rubber Inner Ring (Spider) – Flexible rubber element that transmits torque, absorbs shock, and compensates for misalignment .
Keyway + Set Screw Fastening – Secure shaft fixation.
💡 How it works: The NM coupling consists of two cast iron hubs with interlocking convex claws and a natural rubber inner ring. Torque is transmitted through the rubber element, which provides vibration damping, shock absorption, and misalignment compensation . The quick release design allows for fast installation and maintenance without special tools .
Product Features & Advantages
| Advantage | Benefit |
|---|---|
| Precision Cast Iron Hubs | GB9439 standard – robust, durable, break-resistant |
| Natural Rubber Spider | Excellent vibration damping, shock absorption, and misalignment compensation |
| Quick Release Design | Fast installation and maintenance – no special tools required |
| High Torque Capacity | 125 kg·m max torque – handles heavy-duty applications |
| Wide Motor Compatibility | Adapts to motors up to 60 HP / 45 kW |
| Broad Shaft Range | 7–75 mm shaft diameter – covers most industrial applications |
| H7 Precision Bore | High concentricity, accurate shaft fit – reduces vibration |
| No Lubrication Required | Maintenance-free – reduces operating costs |
| Stable & Quiet Operation | Low noise, smooth power transmission |
| Oil & Wear Resistant | Rubber spider resists oil, grease, and wear |
| Corrosion-Resistant | Painted finish – protects against moisture and corrosion |
| OEM Customization | Custom bores, keyways, and spider materials available |
Applications
Water Pumps – Centrifugal, gear, and diaphragm pumps
Electric Motors – General motor-driven machinery
Compressors – Air and gas compressors
Fans & Blowers – Ventilation systems
Conveyors – Material handling systems
Food & Beverage Processing – Hygienic, reliable drives
Printing Machinery – Register control, smooth operation
Construction Equipment – Building material handling
Energy & Mining – Conveyors, feeders, light drives
Agricultural Machinery – Farm equipment, irrigation pumps
Why Choose Apex Coupling for NM Series Couplings?
| Advantage | Description |
|---|---|
| Factory Direct | Competitive B2B pricing – no middlemen |
| Premium Cast Iron | Precision cast to GB9439 standards – robust and durable |
| Natural Rubber Spider | Excellent vibration damping and shock absorption |
| Quick Release Design | Fast installation – reduces downtime |
| Maintenance-Free | No lubrication required – reduces operating costs |
| Wide Compatibility | Fits motors up to 60 HP / 45 kW, shafts 7–75 mm |
| H7 Precision Bore | High concentricity, accurate shaft fit |
| OEM Customization | Custom bores, keyways, and spider materials available |
| Large Stock | Standard sizes ready for immediate shipment |
FAQ
Q: What is an NM coupling?
A: An NM coupling (also called a Normex coupling or spider coupling) is a cast iron flexible jaw coupling consisting of two precision cast iron hubs and a natural rubber spider element. It is designed for pump, motor, and general industrial applications .
Q: What is the maximum torque capacity?
A: The maximum torque is 125 kg·m (approx. 1225 N·m) .
Q: What motor power can this coupling handle?
A: Adaptive motor power is within 60 HP / 45 kW .
Q: What shaft diameters are compatible?
A: The shaft diameter range is 7–75 mm .
Q: What material is used for the hubs?
A: The hubs are made of precision cast iron – meeting GB9439 standards for safe and reliable operation .
Q: What is the spider made of?
A: The spider is made of natural rubber – providing excellent vibration damping, shock absorption, and misalignment compensation .
Q: Does the coupling require lubrication?
A: No. The NM series is maintenance-free – no lubrication required .
Q: Is the coupling easy to install?
A: Yes. The quick release design allows for fast installation and maintenance without special tools .
Q: What models are available?
A: Standard models include NM50, NM67, NM82, NM97, NM112, NM128, NM148, NM168, NM194, and NM214. Custom sizes available on request.
Q: Can I get a custom coupling?
A: Yes. We offer OEM, ODM, and OBM support – custom bores, keyways, and spider materials available.
Request a Quote
Send us your model size (e.g., NM128), bore size, torque, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.
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