Understanding the Product

The HRC55-60 Pin Shaft is a high-load fastening and transmission component tailored for crane parts and excavator components. Manufactured by ETERNAL (model: FORGE-S-OD200*L810), it is made from 40CrNiMo/4340 forging steel—a premium alloy steel known for exceptional tensile strength and impact toughness. It undergoes quenching and tempering heat treatment to achieve a hardness range of HRC55-60 and a 2-4mm deep quenching layer, ensuring wear resistance and fatigue durability. Unlike ordinary pin shafts, it can withstand frequent insertion/removal and heavy loads (e.g., crane boom lifting) without deformation, making it a core part of construction machinery, agricultural equipment, and industrial drive systems.

Technical Parameters

Key Features

High-strength alloy steel: 40CrNiMo/4340 steel combines nickel (improves toughness), chromium (enhances hardenability), and molybdenum (resists tempering softening) to handle heavy loads (e.g., crane boom tension).

Precise hardness control: HRC55-60 hardness ensures wear resistance for hinge points while retaining core toughness to avoid breakage under sudden impacts.

2-4mm quenching layer: The deep quenching layer boosts surface durability, reducing wear from component friction in high-cycle applications (e.g., excavator arm movement).

Quenching and tempering treatment: Refines the steel’s microstructure, improving dimensional stability and resistance to fatigue failure during repeated load cycles.

Surface hardening options: High-frequency hardening or carburization can be added for extra wear resistance in high-abrasion areas (e.g., crane hook hinges).

Wide size compatibility: OD 50mm-500mm and customizable lengths fit small excavators, large crawler cranes, and agricultural machinery (e.g., tractor hitches).

Reliable quality: 1-year warranty and strict inspection (hardness testing, dimensional measurement) ensure consistent performance in harsh construction environments.

Typical Uses

The HRC55-60 Pin Shaft is widely used in:

Crane boom connections: Linking boom sections to bear vertical lifting loads and horizontal tension, critical for safe heavy-object hoisting.

Excavator arm hinges: Connecting excavator buckets and arms, withstanding digging forces (up to 500kN) and repeated rotational movement.

Agricultural machinery: Fastening tractor plows and harvester cutting components, resisting impact from field debris.

Transportation equipment: Securing trailer suspension and hitch components, ensuring load stability during long-distance transit.

Industrial machinery: Hinging gearbox components and conveyor systems, with wear resistance maintaining precision in factory production lines.

FAQ

What is the hardness of this 40CrNiMo pin shaft, and why is it important?

The hardness is HRC55-60—this range balances wear resistance (to handle friction between crane boom parts) and toughness (to avoid breaking when lifting heavy objects), which is critical for construction machinery safety.

Why is quenching and tempering used instead of other heat treatments?

Quenching and tempering (Q&T) hardens the steel to HRC55-60 while reducing brittleness. This is essential for pin shafts, as they need to withstand both heavy loads and occasional impacts without deformation or fracture.

What is the maximum load this pin shaft can handle?

Load capacity depends on size—for the standard OD200mm model, it can safely bear axial loads up to 200kN and radial loads up to 150kN. Larger OD models (e.g., OD500mm) can handle higher loads (up to 800kN).