ISO 8752 Heavy Duty Slotted Spring Pin | 65Mn Black Oxide Roll Pin

Product overview

ISO 8752 is international standard heavy-duty slotted spring pin (equivalent to DIN1481 & GB/T879.1), hollow cylinder with full-length axial straight slot and double-end chamfer, widely used for component positioning and anti-loose connection. Made of premium 65Mn spring steel with integral quenching & tempering, finished by black oxide treatment. It generates continuous radial expansion force after pressing into mounting holes for self-locking fixing, featuring strong shear resistance, stable elasticity and rust-proof black finish, widely applied in mechanical assembly, automotive and hydraulic equipmentISO.

Material & Surface Treatment

All ISO8752 spring pins adopt domestic high-quality 65Mn spring steel as raw material, complying with domestic spring steel material specification. Raw Material Performance：65Mn features excellent hardenability, uniform internal grain after overall quenching and tempering, high tensile strength and outstanding fatigue resistance, perfect for heavy-duty repeated dynamic assembly requirements. Surface Finish: Standard black oxide (blackening) treatment via high-temperature alkaline oxidation, forming compact black anti-rust film on pin surface without dimension change; improves wear resistance and short-term anti-corrosion capacity, low friction during press fitting, cost-effective for general dry & indoor working conditions. Custom surface options including phosphating, zinc plating available per client’s demand.

Features & Advantages

• Standard Compliance：Strictly manufactured per ISO8752:2009 international standard, interchangeable with DIN1481/GB/T879.1 standard pins, precise dimensional toleranceISO. • Heavy-Duty Shear：65Mn heat-treated steel ensures high shear load capacity, ideal for heavy-load positioning compared with light-type ISO13337 spring pins. • Self-Locking Elasticity：Built-in spring expansion force after installation, no extra locking parts needed, anti-loose against vibration and impact. • Black Oxide Finish：Uniform matte black surface, anti-rust, smooth pressing installation, no extra lubrication required for regular assembly. • Easy Assembly：Double-end chamfer design for quick hammer pressing into holes, high assembly efficiency for mass production. • Wide Size Range：Complete stock sizes from Ø1mm~Ø50mm, diversified length options to match different assembly depth demands.

Application

ISO8752 65Mn black oxide slotted spring pins are widely used for component positioning in automotive transmission & engine parts, motorcycle assemblies, gear reducers, hydraulic cylinders, pneumatic components, engineering machinery, agricultural equipment, household appliances, electric power fittings, pump & compressor parts, precision automation equipment and general mechanical structural connection.