Industrial GR38 Flexible Curved Tooth Jaw Coupling (Rotex 38 Equivalent)

Heavy-Duty Steel Spider Coupling for Pump Drives, Hydraulic Machinery & Construction Equipment

Apex Coupling’s GR38 Flexible Jaw Coupling (DJ-A Type Star Elastic Coupling) is a direct, fully interchangeable replacement for standard Rotex 38 series elastomeric couplings. Engineered with precision-machined 45# steel hubs and a high-wear 98 ShA polyurethane curved spider block, this coupling absorbs rotational vibration, reduces bearing strain, and provides maintenance-free power transmission in harsh industrial environments.

• Model Rating: GR38 / Rotex 38 Series (Dimensions: Outer Dia D = 80 mm, Length L =114 mm, Bore Range d = 10-50 mm)

• Hub Material: Forged 45# Steel (Blackened Anti-Corrosion Finish)

• Elastomer Element: 98 ShA Polyurethane Spider Block (Involute Curved Tooth Design)

• Rated Torque: Up to 2,000 N·m (1,475.12 lb·ft)

• Operating Speed: 1,000 – 3,800 RPM

• Working Temperature: -35°C to +80°C

• Fixing Type: Keyed Bore with Set Screw Fastening / Axially Plug-in Installation

• MOQ: 1 Set (Bulk wholesale supply & custom keyways/bores available)

2. Key Features & Industrial Advantages

Why Choose Apex GR38 Flexible Jaw Couplings?

1. Direct Rotex 38 Drop-In Interchange: Manufactured strictly to standard ROTEX series dimensions, allowing effortless 1:1 replacement on existing pumps, hydraulic power units, and gearboxes.

2. Involute Curved Tooth Cushioning: The elastomeric polyurethane spider element features a convex-claw and involute curved profile, drastically reducing surface contact pressure on teeth to prevent overload deformation and premature wear.

3. Compact Size & Low Inertia: Compact design provides high power density and minimal weight inertia while ensuring maintenance-free performance under shock loads.

4. Tri-Directional Misalignment Compensation: Compensates for radial, angular, and axial shaft misalignments while dampening torsional shock and isolating motor noise.

5. Axial Plug-in Assembly: Features a simple axial plug-in design for fast blind-assembly during installation and quick spider element replacement during routine maintenance.

3. Complete ROTEX / GR Series Dimensional Table

Technical Specifications & Size Chart

(Note: Custom bores with standard DIN 6885/1 keyways, inch sizes, or splined hubs are available upon request.)

4. Industrial Applications

Recommended Applications for GR38 Couplings

Apex GR38 couplings are heavily specified across global heavy equipment industries:

• Centrifugal Water Pumps, Hydraulic Power Packs & Fluid Machinery

• Construction Machinery & Mining Excavator Drive Lines

• Building Material Equipment & Machinery Repair Lines

• Food & Beverage Processing Facilities & Chemical Plants

• Printing Machinery & Woodworking Equipment

5. B2B Inquiry Form

Request Factory Pricing & CAD Drawings for GR38 Couplings

Looking for reliable B2B supply, OEM private labeling, or bulk price discounts on GR38 flexible couplings? Complete the technical inquiry form below for a rapid engineering reply.

• Contact Name & Company Name:

• Corporate Email Address:

• Target Size / Model (e.g. GR38 / Rotex 38, Bore d1 / d2):

• Shaft Bore Requirements (e.g., 38mm keyway bore, H7 tolerance):

• Estimated Annual / Order Quantity (Sets):

• Upload Technical Drawing / Equipment Specs: