Flat Hydraulic Breaker Pin 42CrMo Chisel Retaining Pin for SB81 / SB121

This heavy-duty hydraulic breaker flat pin is a precision-engineered 42CrMo chisel retaining pin, designed as a reliable hydraulic breaker spare part compatible with SB81 and SB121 hydraulic breakers. Serving as an essential excavator breaker retaining accessory, it adopts integral forging technology to deliver exceptional hardness and strong impact resistance. This sturdy fixing pin securely locks breaker chisels, effectively preventing loosening and falling off during high-frequency heavy crushing work, ensuring long-term stable and safe operation of SB81 and SB121 breaking equipment.

• Product Name: Hydraulic Breaker Flat Pin, 42CrMo Chisel Retaining Pin
• Material: High-quality 42CrMo Alloy Steel
• Product Type: Breaker Chisel Fixing Flat Pin Spare Part
• Core Features: High hardness, wear resistance, impact resistance, anti-deformation, tight locking, long service life
• Processing Technology: Integral die forging, precision finishing, overall heat treatment
• Function: Fix breaker chisel, prevent falling off, stabilize operating performance

1. Forged from 42CrMo alloy structural steel, its tensile strength is over 40% higher than ordinary 45# steel flat pins. With integral quenching and tempering plus surface high-frequency quenching, it maintains stable hardness at HRC 48-52, ensuring both excellent wear resistance and impact toughness, resisting breakage and deformation under high-frequency impact conditions.
2. The dimensional tolerance of the pin body is controlled within ±0.03mm, and the coaxiality of the mounting holes is ≤0.03mm, ensuring a perfect fit with the breaker chisel and bushings. It eliminates installation gaps, avoids additional wear caused by shaking, and extends the overall service life of both the flat pin and the chisel.
3. Standard with black oxide/phosphating surface treatment, it effectively isolates moisture, dust, and mud erosion. It resists rust and corrosion in harsh conditions such as mines, quarries, and demolition sites, reducing the risk of jamming and maintaining stable performance over long-term use.
4. Each batch undergoes three strict quality inspections: hardness testing, flaw detection, and impact testing to eliminate internal cracks, uneven hardness, and other defects. Under normal working conditions, its service life reaches 500-800 hours, more than twice that of ordinary flat pins, significantly reducing replacement costs and downtime for customers.