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Help CenterFigure 8 Jaw Coupling Aluminum Alloy 80 Shore A Polyurethane Spider 30mm Outside Diameter
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Hebei Speed Torque Transmission Technology Co., Ltd. proudly presents our premium Figure 8 Jaw Coupling – a compact and reliable solution for precision shaft connection. Crafted from high-strength aluminum alloy and equipped with an 80 Shore A polyurethane spider, this 30 mm outside diameter coupling delivers outstanding torsional flexibility and vibration absorption. Designed for demanding industrial applications, it combines lightweight construction with excellent wear resistance, ensuring long service life and reduced maintenance. Our factory, spanning 3,000–5,000 m² with ISO9001 certification, guarantees consistent quality and prompt delivery worldwide.
This coupling is ideal for connecting two shafts while compensating for minor misalignments – angular, parallel, and axial. The polyurethane spider (often called a jaw insert) provides a damping effect that protects connected equipment from shock loads and reduces noise. With a 30 mm outer diameter, it fits compact spaces and is suitable for small to medium torque applications such as pumps, gearboxes, conveyors, and servo motors.
Key Features & Technical Specifications
- Material Excellence: 6061 aluminum alloy body – light yet strong, corrosion-resistant, and non-magnetic. The spider is made from high-quality polyurethane (80 Shore A) – flexible, oil-resistant, and durable.
- Precision Machining: CNC-machined for tight tolerances (typical concentricity ≤0.02 mm). Keyways and set screws ensure secure shaft mounting.
- Easy Installation: Split design with a flexible insert that can be replaced without moving the hubs – reduces downtime.
- Versatile Compatibility: Can accommodate shafts of different diameters (bore sizes customizable upon request). Common bore range: 6 mm to 14 mm.
- High Torque Capacity: Despite its small size, the 30 mm OD coupling can transmit torque up to approximately 5–8 Nm (depending on bore and material – values available upon request).
- Operating Temperature: Standard polyurethane spider handles -30°C to +80°C. For higher temperatures, optional Hytrel or bronze spiders are available.
- Color: Natural silver / aluminum finish; optional black anodized or clear coating for extra corrosion protection.
| Parameter | Value / Range |
| Outside Diameter | 30 mm |
| Spider Hardness | 80 Shore A |
| Bore Range (custom) | 6 – 14 mm typical |
| Length (hub + gap) | ~25 – 30 mm (varies by model) |
| Rated Torque | Up to 8 Nm (depending on bore) |
| Max Speed | ~10,000 RPM (with balanced hubs) |
| Misalignment Compensation | Angular ≤ 1°, Parallel ≤ 0.1 mm, Axial ± 0.3 mm |
Customer Benefits: By using this coupling, you reduce vibration transmission, protect expensive downstream equipment, and simplify shaft alignment. The replaceable polyurethane insert extends overall coupling life – simply swap the spider when worn, without replacing the hubs. This leads to lower total cost of ownership and minimal production downtime.
Why Choose Hebei Speed Torque?
Since 2017, we have grown into a professional manufacturer with 3,000–5,000 m² of production space and a dedicated team of 101–200 employees. Our annual export value of US$5–10 million reflects the trust of customers across North America, South America, Europe, Asia, Africa, and Oceania. We ship from major Chinese ports (Shanghai, Tianjin, Qingdao) with reliable logistics. Every product is manufactured under our ISO9001-certified quality management system, ensuring consistent dimensional accuracy and material performance. We also offer customization services – special bore sizes, keyways, set screws, or even different spider materials (e.g., Hytrel, NBR) to meet your exact requirements.
Ready to improve your drivetrain reliability? Contact our sales team today for technical datasheets, a quote, or free samples. With our competitive pricing and fast lead times (typically 15–25 days), you can start reaping the benefits of high-quality power transmission components immediately.
Frequently Asked Questions
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What is the maximum torque this coupling can handle?
The torque depends on the bore size and spider material. For a 30 mm OD coupling with a 10 mm bore, the typical rated torque is approximately 6 Nm. For exact values, please provide your bore diameter and we will calculate accordingly. -
Can the spider be replaced without removing the hubs?
Yes, that is one of the advantages of a jaw coupling. By loosening the set screws and sliding one hub back, the spider can be swapped out without disturbing the shaft positions. -
What is the operating temperature range for the polyurethane spider?
Standard polyurethane (80 Shore A) works from -30°C to +80°C. For higher or lower temperature environments, we offer Hytrel (up to 120°C) or bronze spiders (for extreme heat). Please specify when ordering. -
Do you offer custom bore sizes?
Absolutely. We can machine bores from 6 mm up to 14 mm for this 30 mm OD coupling. Custom keyways, threads, or metric dimensions are also available. Minimum order quantity may apply. -
Is this coupling electrically insulating?
Yes, the polyurethane spider is non-conductive, providing electrical isolation between shafts. This can help prevent galvanic corrosion in certain applications. -
How much misalignment can it compensate?
Generally, angular misalignment up to 1°, parallel misalignment up to 0.1 mm, and axial movement up to ±0.3 mm. These values are typical; excessive misalignment may reduce spider life. -
What are the lead times and shipping options?
Standard lead time is 15–25 days after order confirmation. We ship via sea or air from Shanghai, Tianjin, or Qingdao. Express delivery (DHL/FedEx) is available for small orders. -
Do you provide a warranty?
Yes, we offer a 12-month warranty against manufacturing defects. Our ISO9001 system ensures thorough quality checks before shipment.
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