42CrMo Forged Alloy Steel Hydraulic Breaker Piston Bits Atlas Copco Rock Hammer Parts For Demolition

Atlas Copco SB series hydraulic breaker piston is the core impact power transmission component for solid-body light and medium hydraulic breakers, widely matched with 1–16 ton mini and medium excavators for building demolition road renovation landscaping and secondary rock breaking projects. This replacement spare part covers all mainstream SB models SB50 SB52 SB100 SB102 SB150 SB152 SB200 SB202 SB300 SB302 SB400 SB450 SB452 SB552 SB702 and SB850. 42CrMo alloy steel is our standard high-performance material for SB series demolition pistons. We also supply multiple alternative high-strength alloy steel grades including 40Cr 20CrMo GCr15 40CrNiMo 9Cr2MoV SCM440 SAE4140 SAE4340 with customizable material formula for different working loads. Every piston adopts one-piece integral forging craft to eliminate internal shrinkage cavities pores and micro cracks. Multi-stage quenching and tempering heat treatment forms balanced gradient hardness: the striking end maintains ultra-high wear resistance for continuous high-frequency impact, while the main rod body retains excellent toughness to avoid fracture under heavy demolition workloads. All piston surfaces undergo precision CNC turning and fine grinding to achieve ultra-smooth matching tolerance with the SB solid body cylinder. Perfect concentric fit reduces friction loss between piston and cylinder wall, effectively lowering oil leakage risk and extending service life of seal kits and guide bushing. Cooperated with the built-in nitrogen accumulator diaphragm, it gives full play to the breaker’s EnergyRecovery rebound energy recycling technology for stable consistent striking force. Suitable for indoor building demolition concrete slab removal wall breaking asphalt cutting foundation trimming and small quarry secondary crushing works. Each finished piston passes chemical composition inspection hardness test hydraulic matching test and continuous impact endurance test to reach original equipment interchange standards. We maintain abundant stock of all SB series piston specifications supporting small repair retail orders and large bulk wholesale for demolition companies and machinery rental firms. Custom diameter length and oil groove machining service can be customized for global machinery maintenance factories and spare parts dealers.