Product Overview

This NM bow‑shaped coupling insert is an elastomer buffer element specially designed for NM series flexible shaft couplings. It absorbs shock and dampens vibration during power transmission, while compensating parallel, angular and axial shaft misalignment.
Multiple material grades including NBR, CSM/SBR, TPU and nylon are available, delivering reliable performance for heavy‑duty industrial drive systems.

Item	Specification
Available Material	NBR, CSM/SBR, TPU, Nylon
Color	Black, yellow, red, purple, green, beige, custom colors
Surface Finish	Smooth moulded surface
Hardness Range	70‑98 Shore A
Tensile Strength	8‑55 MPa
Elongation	400%‑650%
Tear Strength	35‑155 KN/m
Density	1.25 g/cm³
Impact Elasticity	＞25%
Akron Abrasion Loss	＜0.05 cm³/1.61 km
Compression Set (22h @70℃)	＜10%
Max Working Temperature	120°C

Standard NM Series Sizes

NM50, NM67, NM82, NM97, NM112, NM128, NM148, NM168, NM194, NM214, NM240, NM265


Note: We also supply matching NM series cast iron coupling hubs upon request.

Key Advantages

- Unique bow‑shaped structure for excellent vibration damping and shock absorption
- Compensates parallel, angular and axial shaft misalignment, protects connected equipment
- Wear‑resistant, oil‑resistant and anti‑aging for long‑term continuous running
- Maintenance‑free, no lubrication required, low‑noise operation
- Quick on‑site installation and replacement, reduce equipment downtime
- Multiple material options for different working environments
- Standard sizes in stock; OEM & custom molding service supported

Application Fields

Widely used for water pumps, air compressors, gearboxes, conveyors, hydraulic power units, construction machinery and general‑purpose industrial transmission equipment.

Material Selection Tip
- **NBR**: Good oil resistance, suitable for oil‑contact working conditions
- **CSM/SBR**: General‑purpose rubber for normal vibration‑damping scenarios
- **TPU**: Higher wear resistance, for heavy‑load and high‑impact applications
- **Nylon**: For high‑rigidity, high‑torque transmission requirements

Packaging

Packed in poly bags, cartons, wooden pallets or crates according to order volume.

Inquiry Guide

When sending your inquiry, please kindly confirm: coupling size, material requirement and quantity.
OEM custom sizes, hardness and colors are acceptable.