Product Name: Premium Quality Seamless Steel Tubes for Durable Shock Absorbers
Brand: Gilan Hardware Private
Reference Model Series: GH-SA-SST Series
Model Code Explanation：
GH-SA-SST：Gilan Hardware – Shock Absorber – Seamless Steel Tube
OD25×WT2.5：Outer Diameter 25 mm × Wall Thickness 2.5 mm
45#：Material Grade（45# Carbon Steel）
Product Overview
Gilan Hardware Private supplies premium quality seamless steel tubes engineered for durable shock absorbers in automotive and motorcycle suspension systems. Manufactured by precision cold-drawn or cold-rolled processes, these tubes deliver high dimensional accuracy, excellent surface finish, and superior fatigue resistance. Our products are widely applied in hydraulic shock absorbers, strut assemblies, and precision suspension components for passenger vehicles, commercial trucks, and two-wheelers.
Key Technical Parameters (Typical, based on Fujian BSP series)
Materials：20#, 45# Carbon Steel；40Cr, 40Mn2, 37Mn5 Alloy Steel；ST35/ST45/ST52；E235/E355；CK45；S45C；ASTM A519 1020/1045
Outer Diameter (OD) Range：Φ6 mm – Φ114.3 mm（common shock absorber range OD18–38 mm）
Wall Thickness (WT) Range：1.0 mm – 15 mm（typical 2–4 mm for shock absorbers）
Length：Up to 12 meters（fixed or random length customizable）
Tolerance：Tight ID/OD tolerances per DIN 2391, EN 10305-1, GB/T 8713, YB/T 4675
Surface Treatment：Oiled（anti-rust），bright annealed，optional phosphating
Technique：Seamless, Cold Drawn / Cold Rolled / Hot Rolled
Certification：IATF 16949, ISO 9001（available upon request）
Standards：ASTM A519, JIS G3445, DIN 2391, EN 10305-1, GB/T 3639, YB/T 4675-2018
Product Advantages
High Precision & Smooth Surface：Fine inner/outer surface（Ra low, minimal machining needed）, tight dimensional control ensures proper piston/seal fitment.
Excellent Fatigue & Wear Resistance：Optimized steel grades and heat treatment（normalize, anneal, Q+T）withstand cyclic suspension loads.
High Strength Options：Carbon steel（410–645 MPa）to alloy steel（≥780 MPa, HRC 22–30 for 40Cr）tailored to light/mid/heavy-duty absorbers.
Customization：OD, WT, length, chamfering, end finishing, and material grade customizable per drawing or sample.
Typical Applications
Automotive / motorcycle / EV shock absorber cylinders
Hydraulic suspension tubes, strut assemblies
Precision mechanical structures requiring seamless tubing under dynamic load
