A new batch of honed alloy steel tubes has cleared on-site client inspection at Lenser Metal, with the ID (inside diameter) surface honed to a mirror-smooth finish. The order — sized at Φ250 × 8M — has been released for packing and is ready for shipment to the client's hydraulic cylinder production line.
What the client came to verify
The client joined our workshop in person to witness the final honing stage and to validate surface roughness, dimensional tolerance, straightness, and roundness against their drawing. In a single visit we walked the inspector from raw seamless tube, through heat treatment and cold drawing, all the way to the precision honing line — and every tube passed on the first round.
Why honed, why mirror-grade
Honing is the last finishing step before the tube goes into a hydraulic cylinder. The abrasive stones remove only a few microns, but they lay down a controlled cross-hatch pattern that determines how the cylinder will behave for the next decade.
- Lower friction, longer seal life — Ra ≤ 0.2 μm keeps seals running cool.
- Stable oil film under high-pressure cycling — no stick-slip, no leaks.
- Tight geometry — roundness held within ≤ 0.03 mm for a Φ250 bore.
- Quieter operation in mobile and industrial hydraulic systems.
Specs on this shipment
Who this is for
If you source honed tubes for hydraulic cylinders, mobile equipment, mining machinery, or marine hydraulics, Lenser Metal can quote on:
- OD range 40 – 700 mm, length up to 12 m
- Grades: 16Mn, 20#, 45#, Q345B, 34CrMo4, 42CrMo, 4130, 4140, EN 10305-1
- Optional internal stress-relief, phosphating, anti-rust oiling, end caps, custom marking
Get a factory-direct quote
Send your drawing — or just the basics: OD × ID × length, material grade, required surface roughness, quantity, destination port. Our team replies within 24 hours.
Request a Quote Now— Lenser Metal · Professional Steel Manufacturer. Providing the most reliable customized steel & metal supply solutions for buyers across 110+ countries. Reliable quality. Factory-direct price. On-time delivery.
Summary
Another batch of honed alloy steel tubes has cleared on-site client inspection. Sized at Φ250×8M, the ID surface reaches a mirror-grade finish of Ra ≤ 0.2 μm, with roundness held within 0.03 mm — all passed first round. Suited for hydraulic cylinder barrels, mining and port equipment, and marine hydraulic systems. Lenser Metal quotes honed tubes from OD 40–700 mm, up to 12 m long. Inquiries welcome.