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Cast Iron Quick Release Flexible Jaw Rubber NM Coupling – for Electric Motors & Water Pumps
Model Number
Check below, custom
NM50-D50-Bore(7~19)-L(51.5~52)
NM67-D67-Bore(8~28)-L(62~62.5)
NM82-D82-Bore(10~32)-L(82~84)
NM97-D97-Bore(12~42)-L(102~104)
NM112-D112-Bore(14~48)-L(122.5~124.5)
NM128-D128-Bore(18~55)-L(142.5~144.5)
NM148-D148-Bore(22~65)-L(162.5~164.5)
NM50-D50-Bore(7~19)-L(51.5~52)
NM67-D67-Bore(8~28)-L(62~62.5)
NM82-D82-Bore(10~32)-L(82~84)
NM97-D97-Bore(12~42)-L(102~104)
NM112-D112-Bore(14~48)-L(122.5~124.5)
NM128-D128-Bore(18~55)-L(142.5~144.5)
NM148-D148-Bore(22~65)-L(162.5~164.5)
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
Factory direct | Cast iron hubs | Natural rubber spider | 125 N·m max torque | 60HP/45kW | Quick release design | GB9439 standard | Low noise | Stable operation
The Apexcoupling NM series is a cast iron quick release flexible jaw coupling designed for reliable power transmission in electric motor and water pump applications. Featuring a robust two-piece cast iron construction with a natural rubber inner ring, this coupling delivers excellent vibration damping, misalignment compensation, and shock absorption. The quick release design allows for fast installation and maintenance, making it ideal for pumps, fans, compressors, and general industrial machinery. Manufactured to GB9439 cast iron standards, this coupling is safe, reliable, and built for long service life.
✅ Stable operation, low noise – ideal for electric motors and water pumps up to 60HP/45kW.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | Apexcoupling |
| Model Series | NM (Cast Iron Quick Release Flexible Jaw Coupling) |
| Type | Flexible / Jaw / Rubber |
| Structure | Two cast iron convex claw parts + natural rubber inner ring |
| Hub Material | Cast iron – precision casting, GB9439 standard |
| Spider Material | Natural rubber |
| Maximum Torque | 125 kg·m (approx. 1225 N·m) |
| Adaptive Motor Power | Within 60HP / 45kW |
| Adaptive Shaft Diameter | 7 – 75 mm |
| Speed Range | 2500 – 13,500 RPM |
| Backlash | Zero (with proper spider fit) |
| Misalignment Compensation | Angular, parallel, and axial |
| Vibration Absorption | Yes – natural rubber spider dampens shock and vibration |
| Quick Release Design | Yes – fast installation and maintenance |
| Standard | In line with GB9439 cast iron standards |
| Customized support | OEM, ODM, OBM |
| Applicable Industries | Manufacturing plants, machinery repair shops, food & beverage factories, farms, home use, retail, printing shops, construction works, energy & mining |
| Certification | ISO9001, BV Certificate |
| Warranty | 1 Year |
| Place of Origin | Guangdong, China |
🔧 Custom bore sizes, keyways, and special spider materials available. Contact us with your specifications.
Product Structure
Two Cast Iron Convex Claw Hubs – Precision cast to GB9439 standards, robust and durable, not prone to breakage during operation .
Natural Rubber Inner Ring (Spider) – Flexible rubber element that transmits torque, absorbs shock, and compensates for misalignment .
Quick Release Design – Allows for fast installation and maintenance without special tools.
💡 The two-piece cast iron construction with a natural rubber spider provides excellent vibration damping, shock absorption, and misalignment compensation – protecting connected equipment from damage .
Product Features & Advantages
| Advantage | Benefit |
|---|---|
| Cast Iron Construction | Robust, durable, precision cast – not prone to breakage during operation |
| Natural Rubber Spider | Excellent vibration damping, shock absorption, and misalignment compensation |
| Quick Release Design | Fast installation and maintenance – reduces downtime |
| High Torque Capacity | Maximum torque 125 kg·m – suitable for demanding applications |
| Wide Power Range | Adapts to motors up to 60HP/45kW |
| Broad Shaft Compatibility | Fits shaft diameters from 7 to 75 mm |
| Stable Operation | Low noise, smooth power transmission |
| GB9439 Standard | Manufactured to established cast iron standards – safe and reliable |
| Maintenance-Free | No lubrication required – reduces operating costs |
| OEM Customization | Custom bores, keyways, and spider materials available |
How Flexible Couplings Protect Equipment
Flexible couplings like the NM series play a crucial role in protecting connected equipment:
Vibration Damping – The rubber spider absorbs vibrational energy, converting it into heat and reducing amplitude .
Shock Absorption – The coupling deforms slightly under impact, absorbing and distributing shock energy .
Misalignment Compensation – Compensates for angular, parallel, and axial misalignment, reducing stress on bearings and seals .
Vibration Isolation – Decouples the two shafts, preventing vibrations from propagating across the system .
Resonance Reduction – Alters the system‘s natural frequency to avoid resonance effects .
✅ These features significantly improve reliability and longevity of connected machinery .
Applications
Electric Motors – General motor-driven machinery
Water Pumps – Centrifugal, gear, and diaphragm pumps
Fans & Blowers – Industrial ventilation, air handling
Compressors – Air and gas compressors
Agricultural Machinery – Farm equipment, irrigation pumps
Construction Equipment – Mixers, conveyors, light machinery
Manufacturing Plants – General power transmission
Food & Beverage Processing – Hygienic, reliable drives
Mining & Energy – Conveyors, feeders, light drives
Why Choose Apex Coupling for NM Cast Iron 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 and maintenance – reduces downtime |
| Wide Compatibility | Fits motors up to 60HP/45kW, shafts 7–75 mm |
| Stable & Quiet | Low noise, smooth operation |
| OEM Customization | Custom bores, keyways, and spider materials available |
| ISO9001 & BV Certified | Quality assured for international buyers |
FAQ
Q: What is an NM coupling?
A: An NM coupling is a cast iron flexible jaw coupling consisting of two cast iron convex claw hubs and a natural rubber inner ring (spider). It is designed for electric motor and water pump applications .
Q: What is the maximum torque?
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 60HP / 45kW .
Q: What shaft diameters are compatible?
A: Adaptive shaft diameter range is 7–75 mm .
Q: What material is used?
A: The hubs are made of cast iron (precision cast, GB9439 standard) and the spider is made of natural rubber .
Q: Does the coupling require lubrication?
A: No. The NM coupling is maintenance-free – no lubrication required.
Q: What misalignment can the coupling compensate for?
A: The natural rubber spider compensates for angular, parallel, and axial misalignment .
Q: Is the coupling easy to install?
A: Yes. The quick release design allows for fast installation and maintenance without special tools.
Q: What standard is the coupling manufactured to?
A: The coupling is manufactured in line with GB9439 cast iron standards – safe and reliable .
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 shaft diameter, motor power, torque, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.
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