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DJ-B Type Enlarged Bore Star Elastic Coupling – No Step, 45# Steel, Rotex GR Series Replacement | High Torque Jaw Coupling
Model Number
Check below, custom
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
DJ-B Type Enlarged Bore Star Elastic Coupling – No Step, 45# Steel, Rotex GR Series Replacement
Factory Direct from Guangdong, China | 45# Steel Hubs | Enlarged Bore / No Step Design | Polyurethane Spider (98 SHA) | Torque 15–235,000 N·m | Working Temp -35°C to +80°C | Rotex GR Replacement | Custom Materials Available
Product Overview
The DJ-B Type Enlarged Bore Star Elastic Coupling from Apexcoupling is a high‑torque flexible jaw coupling designed for heavy‑duty power transmission, especially where larger shaft diameters are required. As a Rotex GR series replacement, the DJ-B offers a no‑step (straight bore) design that accommodates larger shafts than the standard DJ-A type, making it ideal for elevators, construction machinery, main shaft drives, lifting platforms, and machine tools.
The coupling features 45# steel hubs with a black oxide or natural finish, and a polyurethane elastomeric spider with a hardness of 98 Shore A. It delivers reliable torque transmission from 15 N·m up to 235,000 N·m and operates in temperatures from -35°C to +80°C. The star‑shaped elastic element compensates for axial, radial, and angular misalignments while providing vibration damping and shock absorption.
With its compact structure, low moment of inertia, and high load capacity, the DJ-B coupling is particularly suitable for frequent starts, reversing drives, and heavy‑load applications. It requires no lubrication, is maintenance‑free, and offers easy installation. The marking method is the same as the DJ-A type, ensuring simple selection and interchangeability.
Apexcoupling maintains large semi‑finished stock for fast delivery and can provide technical support, paper/electronic catalogs, and volume discounts. Custom materials and special designs are available upon request.
📧 Get a Quote: ella@apexcoupling.com | WhatsApp/WeChat: +86 13431039760
Key Attributes
| Attribute | Value |
|---|---|
| Brand | Apexcoupling |
| Model | DJ-B Type Star Elastic Coupling |
| Coupling Type | Star / Jaw Coupling (Enlarged Bore, No Step) |
| Material | 45# Steel (standard); special materials customizable |
| Elastomer Material | Polyurethane (98 Shore A) |
| Rated Torque | 15 – 235,000 N·m |
| Working Temperature | -35°C to +80°C |
| Bore Type | Enlarged Bore / Straight (No Step) |
| Mounting | Keyway / Set Screw / Clamping (optional) |
| Surface Treatment | Natural or Black Oxide (Blackening) |
| Lubrication | Not Required |
| Maintenance | Low / Maintenance-Free |
| Compatibility | Rotex GR Series Replacement |
| Place of Origin | Guangdong, China (Dongguan) |
| Certification | ISO Certified |
Key Features
| Feature | Benefit |
|---|---|
| Enlarged Bore / No Step Design | Accommodates larger shaft diameters than DJ-A – ideal for heavy‑duty installations |
| 45# Steel Hubs | High strength, wear resistance, and stability under heavy loads |
| Polyurethane Spider (98 SHA) | Vibration damping, shock absorption, and misalignment compensation |
| High Torque Capacity | Up to 235,000 N·m for demanding industrial drives |
| Wide Temperature Range | -35°C to +80°C for diverse operating environments |
| No Lubrication Required | Maintenance‑free, reducing downtime and operating costs |
| Compact & Low Inertia | Small radial dimensions and low moment of inertia – suitable for frequent starts and reversing |
| Axial, Radial & Angular Compensation | Protects bearings and shafts from misalignment stress |
| Rotex GR Replacement | Direct interchangeability with Rotex GR series couplings |
| Same Marking as DJ-A | Easy selection and ordering |
| Large Semi‑Finished Stock | Fast delivery for standard and modified sizes |
| Custom Materials Available | Special steels and elastomers for specific working conditions |
Technical Specifications
| Parameter | Details |
|---|---|
| Product Name | DJ-B Type Enlarged Bore Star Elastic Coupling |
| Brand | Apexcoupling |
| Type | Star / Jaw Coupling (No Step) |
| Material | 45# Steel (standard) |
| Elastomer | Polyurethane, 98 Shore A |
| Rated Torque | 15 – 235,000 N·m |
| Working Temperature | -35°C to +80°C |
| Surface Treatment | Natural / Black Oxide |
| Bore Type | Enlarged Bore / Straight (No Step) |
| Mounting | Keyway / Set Screw |
| Lubrication | Not Required |
| Maintenance | Low |
| Compatibility | Rotex GR Series Replacement |
| Place of Origin | Dongguan, Guangdong, China |
| Certification | ISO |
Structural Features
Steel Shaft Sleeves – Especially suitable for heavy‑load transmission units such as elevators and construction machinery.
Similar to DJ-A but with Larger Bore – Designed for installation with larger hole diameters.
Marking Method – Same as DJ-A type for easy selection.
Compact Design & Small Moment of Inertia – Ideal for space‑constrained and dynamic applications.
Elastomer Hardness – 98 Shore A, corresponding to the nominal torque in the selection table.
Applications
The DJ-B enlarged bore star elastic coupling is widely used in:
Elevators & Lifting Platforms – Heavy‑load lifting and positioning systems
Construction Machinery – Cranes, excavators, and concrete equipment
Main Shaft Drives – Machine tool spindles and main drive systems
Machine Tools – CNC lathes, milling machines, and boring machines
Metallurgy & Mining – Crushers, conveyors, and processing equipment
Petroleum & Chemical – Pumps, compressors, and mixers
Water Pumps & Fans – Centrifugal pumps, water supply, and ventilation
Light Textile & Printing – Spinning, weaving, and printing machinery
General Heavy Industrial Drives – Where high torque and large bore are required
Customization Options
Apexcoupling offers extensive customization for the DJ-B star elastic coupling:
Custom bore diameters (enlarged bore / no step)
Keyway, hexagon, square, and spline bores
Special materials: alloy steel, stainless steel
Alternative elastomer materials: NBR, Viton, EPDM
Surface treatments: black oxide, zinc plating, nickel plating, polishing
Drawing‑based production
OEM / ODM / OBM with your branding
📧 Send your drawing or requirements to: ella@apexcoupling.com
Why Choose Apexcoupling?
🏭 Factory Direct in Dongguan, China – Integrated manufacturing and trading, competitive pricing
🔩 Premium 45# Steel Hubs – High strength, wear resistance, and long service life
⚙️ Enlarged Bore / No Step Design – Accommodates larger shafts for heavy‑duty applications
🧵 Polyurethane Spider (98 SHA) – Vibration damping, shock absorption, and misalignment compensation
📐 Full Customization – Bores, keyways, materials, and surface treatments
✅ ISO Certified – Quality assurance and international interchangeability
📦 Large Semi‑Finished Stock – Fast delivery for standard and modified sizes
💰 Volume Discounts – Competitive pricing for large orders
💬 Expert Technical Support – Paper/electronic catalogs and selection assistance available
Get a Quote Today
Ready to order or need more information? Contact us directly:
📧 Email: ella@apexcoupling.com
📱 WhatsApp / WeChat: +86 13431039760
🌐 Website: www.apexcoupling.com
We reply within 24 hours with pricing, availability, and technical recommendations.
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