70178 Universal Joint Cross Shaft – 20CrMnTi, 70mm × 178mm, Heavy-Duty Industrial Replacement

Factory Direct | 20CrMnTi alloy steel | 70mm diameter × 178mm length | Carburized & hardened 58-64HRC | Forged construction | Precision ground | Industrial grade | OEM custom

The Apexcoupling 70178 Universal Joint Cross Shaft is a high-strength replacement component designed for heavy-duty industrial drive systems, motor couplings, conveyor systems, and truck transmissions. Manufactured from premium 20CrMnTi alloy steel with carburizing and hardening heat treatment, this cross shaft delivers exceptional wear resistance, high surface hardness (58-64HRC), and a tough, impact-resistant core (33-48HRC). The precision-ground journal surfaces ensure smooth bearing fit and extended service life. With cold-forged construction, case-hardened finish, and precision grinding, this 70mm × 178mm cross shaft meets or exceeds OEM specifications for heavy-duty applications. The built-in grease fitting allows for easy maintenance and extended service life.

✅ 20CrMnTi alloy steel – carburized & hardened 58-64HRC surface hardness. 70mm diameter × 178mm length – heavy-duty industrial specification. Forged & precision-ground – superior strength and accuracy. Greaseable design – 360° lubricant distribution to all bearing surfaces. Heavy-duty construction – built for industrial machinery, conveyors, and trucks. 100% magnetic particle inspected – quality assured. OEM custom sizes available.

Key Technical Specifications

70178 Cross Shaft – Detailed Dimensions

📐 All dimensions are in millimeters (mm). Custom dimensions and specifications available upon request.

Product Structure

1. Forged Cross Shaft Body – Hot-forged from 20CrMnTi alloy steel for optimal grain structure and material density.

2. Four Precision-Ground Journals – Precision-ground bearing surfaces (70mm diameter, 178mm length) for accurate bearing fit and extended service life. Journal tolerance h6 or g6, surface roughness ≤Ra0.4.

3. Carburized & Hardened Surface – Surface hardness 58-64HRC provides exceptional wear resistance; core hardness 33-48HRC ensures toughness and impact resistance.

4. Grease Fitting (Zerk Fitting) – Allows 360° lubricant distribution to all bearing surfaces for easy maintenance.

5. Needle Roller Bearings – Precision-ground bearings (GCr15) for high load capacity and smooth rotation.

6. 100% Magnetic Particle Inspection – Ensures no cracks or defects.

💡 How it works: The 70178 universal joint cross shaft connects the yokes of a universal joint, transmitting torque between drive components. As the driveline rotates, the cross shaft allows angular misalignment compensation while the needle roller bearings reduce friction. The carburized and hardened surface provides wear resistance, while the tough core withstands shock loads. The grease fitting allows for regular lubrication, extending service life. This design is widely used in industrial machinery, motor couplings, conveyor systems, and truck transmissions, allowing adjacent shafts to operate at angles of 15-20°.

Material – 20CrMnTi Alloy Steel

The 70178 cross shaft is manufactured from 20CrMnTi low-carbon alloy steel with carburizing and hardening heat treatment:

💡 20CrMnTi offers an optimal combination of surface hardness (58-64HRC) for wear resistance and core toughness (33-48HRC) for impact resistance, making it the ideal material for heavy-duty industrial universal joint cross shafts.

Product Features & Advantages

Applications

• Industrial Machinery – Power transmission systems, general industrial drives

• Motor Couplings – Electric motor to driven equipment connections

• Conveyor Systems – Material handling, assembly lines, bulk material transport

• Truck Transmissions – Heavy-duty commercial vehicle drive shafts

• Agricultural Machinery – Tractor PTO drives, farm equipment

• Construction Equipment – Heavy machinery drives, earthmoving equipment

• Mining Equipment – Crushers, conveyors, feeders

• Paper Machinery – Paper production and finishing equipment

• Steel Mills – Rolling mill drives, heavy industrial applications

Why Choose Apex Coupling for 70178 Cross Shafts?

FAQ

Q: What is the 70178 universal joint cross shaft?
A: The 70178 universal joint cross shaft is a heavy-duty replacement component measuring 70mm diameter × 178mm length. It is manufactured from 20CrMnTi alloy steel with carburized and hardened surface (58-64HRC).

Q: What material is used?
A: The cross shaft is manufactured from 20CrMnTi low-carbon alloy steel – a premium carburizing steel for universal joint cross shafts. The surface is carburized and hardened to 58-64HRC.

Q: What is the hardness of the cross shaft?
A: The surface hardness reaches 58-64HRC (carburized layer), while the core maintains 33-48HRC for toughness and impact resistance.

Q: What are the dimensions of the 70178 cross shaft?
A: Diameter: 70mm, overall length: 178mm.

Q: Does the cross shaft have a grease fitting?
A: Yes. The cross shaft incorporates a grease fitting that allows 360° lubricant distribution to all bearing surfaces for easy maintenance.

Q: Is the cross shaft forged?
A: Yes. The universal joint cross shaft is cold-forged, case-hardened, and precision-ground for superior strength and accuracy.

Q: What is the manufacturing standard?
A: The cross shaft is manufactured according to GB3077-82 (Structural Steel) and GB1801-79 (Tolerances) standards.

Q: What are the common applications?
A: Industrial machinery, motor couplings, conveyor systems, truck transmissions, agricultural machinery, construction equipment, mining equipment, paper machinery, and steel mills.

Q: Is the cross shaft inspected for quality?
A: Yes. 100% magnetic particle inspection ensures no cracks or defects.

Q: Can I get a custom cross shaft?
A: Yes. We offer OEM customization – custom sizes, materials, and finishes available.

Q: What is the warranty?
A: 1 Year – quality assured.

Request a Quote

Send us your required specifications (70178 standard or custom), quantity, and any customization requirements. Our engineers will provide a quotation within 24 hours.