• Whole piece hot forging blank forming, compact internal metal grain, no loose pore inside, avoid expansion jamming under long heavy load.
• Multi-level quenching & tempering treatment: outer surface wear-resistant hardening, inner core retains strong toughness, not easy bending or break under frequent impact.
• CNC precision milling flat side & end face, tolerance controlled within ±0.02mm, tight fit with front head pin hole, no clearance shaking after installation.
• Anti-rust black oxide surface treatment, anti-rust & anti-corrosion in humid mine, rainy open-air construction environment.
• Optimized chamfer design on two ends, convenient quick assembly & disassembly during on-site overhaul maintenance.
• Distinguish from low-cost steel-cut flat pin, our forged craft effectively prevent early deformation and rapid abrasion.
• Independent plastic wrapping + export carton bulk packing, avoid collision scratch during sea transportation.

• Direct replacement spare part for worn/bent original flat pin during SB121 hydraulic breaker routine overhaul.
• Fix typical failure: chisel shaking & abnormal banging noise, fast abrasion of front bushing.
• Regular standby spare for 28~35t excavator fleet with SB121 hammer in quarry mining, road demolition, municipal foundation breaking.
• Bulk stocking consumable for global breaker spare parts wholesaler & local machinery repair workshop.
• Suitable for granite mining, concrete dismantling, frozen soil crushing, roadbed construction heavy-duty scenarios.

• Forged 42CrMo material service life 2.2~3 times longer than ordinary 45# steel cutting flat pin, reduce frequent replacement cost for end user.
• OEM identical dimensional precision, plug-and-play without on-site grinding modification.
• Strict factory sampling shear test, ultra-low early bend failure rate after installation.
• Factory direct sale without middleman markup, improve distributor profit margin.
• Constant spot inventory, 1pc sample available, bulk purchase enjoys tiered discount & 1~7 working days fast delivery.
• 6-month quality warranty for manufacturing defect, free replacement for qualified claim.

Q1: What material is your SB121 flat pin made of?

A1: Premium forged 42CrMo chrome molybdenum alloy steel with full heat treatment.

Q2: Why original flat pin bend easily in construction?

A2: Low carbon steel raw material, no formal heat treatment or long-time overload striking operation.

Q3: Can I buy single piece sample before bulk order?

A3: Sample order is acceptable, large quantity gets preferential price & priority shipment.