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NM Cast Iron Flexible Jaw Coupling – High Torque, 125kg·m, 60HP/45kW
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)
NM168-D148-Bore(28~75)-L(174.5~180.5)
NM198-D198-Bore(32~88)-L(202.5~204.5)
NM218-D218-Bore(45~95)-L(222~230)
NM240-D240-Bore(60~110)-L(242~246)
NM265-D265-Bore(70~120)-L(283.5~287.5)
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
NM Cast Iron Flexible Coupling – High Torque, 125kg·m, 60HP/45kW
Factory Direct | Precision Cast Iron | 125kg·m Max Torque | 60HP/45kW Motors | 7-75mm Shaft | Stable, Low Noise | Maintenance-Free | GB9439 Standard | OEM/ODM/OBM
The Apexcoupling NM series is a high-quality cast iron flexible coupling designed for reliable power transmission in demanding industrial applications. Featuring a robust two-piece cast iron construction with a natural rubber inner ring, this coupling delivers excellent vibration damping, shock absorption, and misalignment compensation. It is ideal for electric motors, water pumps, fans, compressors, and general machinery. Manufactured to GB9439 standards, the NM coupling ensures safe and reliable operation with minimal maintenance.
✅ High torque capacity (125kg·m) for demanding drives. Stable, low-noise operation extends equipment life. Maintenance-free rubber element – no lubrication required. Precision cast iron construction ensures durability and reliability.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | Apexcoupling |
| Model Series | NM (Cast Iron Flexible Jaw Coupling) |
| Type | Flexible / Jaw / Rubber |
| Structure | Two cast iron hubs + natural rubber inner ring |
| Hub Material | Cast iron – precision casting, GB9439 standard |
| Spider Material | Natural rubber – high elasticity, wear-resistant |
| Max Torque | 125 kg·m (approx. 1225 N·m) |
| Adaptive Motor Power | Within 60HP / 45kW |
| Adaptive Shaft Diameter | 7 – 75 mm |
| Operating Temperature | -40°C to +100°C (NBR rubber) |
| Backlash | Zero (with proper fit) |
| Misalignment Compensation | Angular, parallel, and axial |
| Vibration Absorption | Yes – natural rubber spider |
| Lubrication | None required – maintenance-free |
| Standard | GB9439 cast iron standards |
| Customized support | OEM, ODM, OBM |
| Place of Origin | Guangdong, China |
🔧 Custom bores, keyways, and special rubber compounds available. Contact us with your specifications.
NM Series – Model Range
| Model | D (mm) | L (mm) | Bore Range (mm) | Motor Power (HP) |
|---|---|---|---|---|
| NM50 | 50 | 51.5–52 | 7–19 | 1–2 |
| NM67 | 67 | 62–62.5 | 8–28 | 3–5 |
| NM82 | 82 | 82–84 | 10–32 | 7.5–10 |
| NM97 | 97 | 102–104 | 12–42 | 15–20 |
| NM112 | 112 | 122.5–124.5 | 14–48 | 25–30 |
| NM128 | 128 | 142.5–144.5 | 18–55 | 40–50 |
| NM148 | 148 | 162.5–164.5 | 22–65 | 60–75 |
| NM168 | 168 | 174.5–180.5 | 28–75 | 75–100 |
| NM198 | 198 | 202.5–204.5 | 32–88 | 100–125 |
| NM218 | 218 | 222–230 | 45–95 | 125–150 |
| NM240 | 240 | 242–246 | 60–110 | 150–200 |
| NM265 | 265 | 283.5–287.5 | 70–120 | 200–250 |
📐 Additional sizes and custom dimensions available upon request. Contact our engineering team for custom sizing.
Product Structure
Two Cast Iron Hubs – Precision cast to GB9439 standards, robust and durable.
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 rubber compounds 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
Printing Shops – Printing machinery, finishing equipment
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 |
| Maintenance-Free | No lubrication required – reduces operating costs |
| OEM Customization | Custom bores, keyways, and rubber compounds 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 hubs and a natural rubber inner ring (spider). It is designed for electric motor, water pump, and general industrial 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 rubber compounds 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.
NM coupling
Cast iron coupling
Flexible shaft coupling
Electric motor coupling
Water pump coupling
Rubber coupling
Jaw coupling
Industrial coupling
GB9439 cast iron coupling
| Model(MNM01) | Outer Diameter D (mm) | Hub Diameter D1 (mm) | Bore Range d/e (mm) | Rated Torque Min (N·m) | Rated Torque Max (N·m) | Max Speed (rpm) | Overall Length (mm) | L (Hub Length per Side) (mm) | S (Gap Tolerance) (mm) | Weight (kg) | Standard Item |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 50 | 50 | 33 | 7–19 | 1.3 | 2.3 | 12500 | 51.5–52 | 25 | 2.0±0.5 | 0.48 | √ |
| 67 | 67 | 46 | 8–28 | 2.2 | 4.0 | 10000 | 62–62.5 | 30 | 2.5±0.5 | 1.02 | √ |
| 82 | 82 | 53 | 10–32 | 5.0 | 9.0 | 8000 | 82–84 | 40 | 3.0±1.0 | 1.88 | √ |
| 97 | 97 | 69 | 12–42 | 10.5 | 19.0 | 7000 | 102–104 | 50 | 3.0±1.0 | 3.54 | √ |
| 112 | 112 | 79 | 14–48 | 16.7 | 30.0 | 6000 | 122.5–124.5 | 60 | 3.5±1.0 | 5.4 | √ |
| 128 | 128 | 90 | 18–55 | 26.7 | 48.0 | 5000 | 142.5–144.5 | 70 | 3.5±1.0 | 8.1 | √ |
| 148 | 148 | 107 | 22–65 | 41.7 | 75.0 | 4500 | 162.5–164.5 | 80 | 3.5±1.0 | 13.5 | √ |
| 168 | 168 | 124 | 28–75 | 69.5 | 125.0 | 4000 | 174.5–180.5 | 88 | 3.5±1.5 | 19.3 | √ |
| 198 | 198 | 140 | 32–85 | 112.0 | 200.0 | 3500 | 202.5–204.5 | 100 | 3.5±1.5 | 26.3 | √ |
| 218 | 218 | 158 | 45–95 | 167.0 | 300.0 | 3000 | 222–230 | 112 | 4.0±2.0 | 35.7 | √ |
| 240 | 240 | 179 | 60–110 | 267.0 | 480.0 | 2750 | 242–246 | 120 | 4.0±2.0 | 46.7 | √ |
| 265 | 265 | 198 | 70–120 | 417.0 | 750.0 | 2500 | 283.5–287.5 | 140 | 5.5±2.0 | 66.3 | √ |
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NM coupling
