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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 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
Product Advantages
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.
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.
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.
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.
Frequently Asked Questions
What material is the flat pin made of?
Made of forged 42CrMo alloy steel, with overall heat treatment and high-frequency quenching. It features high hardness, excellent toughness and strong impact resistance.
What is the service life of the flat pin under normal working conditions?
Normally it can last 500-800 working hours. Service life varies according to working materials and operating habits.
How to judge when the flat pin needs to be replaced?
Replace it in time if the thickness wears over 2mm, width wears over 3mm, or obvious bending, crack and loose fit appear. Worn pin will cause chisel shaking and weak breaking performance.
Does the product have anti-rust treatment?
Yes. All flat pins are finished with black oxide or phosphating treatment, effectively preventing rust and corrosion in wet, dusty and muddy working sites.
