Blackening Heat Treatment With Hardness Of 42CRMO Material CNC Milling Long Shaft Parts

Product Application:

These are high-strength, wear-resistant, and corrosion-protected long shaft components designed for applications involving significant torque, bending stress, and harsh operating environments.

• Heavy Machinery & Power Transmission: Transmission shafts, pump shafts, gearbox input/output shafts, and drive spindles for industrial equipment, agricultural machinery, and construction vehicles.

• Automotive & Racing Components: Axle shafts, camshafts, steering column shafts, and custom suspension linkage rods requiring high fatigue strength and durability.

• Hydraulic & Pneumatic Systems: Piston rods for hydraulic cylinders, valve stems in high-pressure systems, and actuator shafts.

• Material Handling Equipment: Conveyor drive shafts, roller shafts, and lifting spindle rods.

• Mining & Oilfield Equipment: Drill string components (non-threaded sections), shafting for mud pumps, and other high-abrasion, high-load applications.

Product Description:

We manufacture precision long shaft components from 42CrMo (AISI 4140/4142 equivalent) alloy steel, undergoing a complete performance-enhancing process. The parts are first precision CNC machined from annealed bar stock to the required complex geometry, which may include steps, keyways, splines, threads, and bearing journals. Following machining, they undergo quench and temper heat treatment to achieve a specified core hardness (typically in the range of 28-32 HRC for toughness, up to 40+ HRC for wear surfaces) and high tensile strength. Finally, a black oxide (blackening) surface treatment is applied, which provides mild corrosion resistance, reduces light glare, and improves aesthetics and oil retention. This combination results in a component that is dimensionally accurate, extremely strong, resistant to wear, and protected against rust, ideal for critical rotating or sliding applications.

Product Technical Parameters: