Long bored parts and cylinder barrels for hydraulic, mining, press and machine builders.
Long-bore and internal-surface process chain
BTA Ø30–110 mm
4 000 mm
Honing Ø300 × 2000 mm
Internal hard chrome
honed tube hydraulic cylinder tube
In our own process chain we BTA-drill solid steel, hone the bore and apply internal hard chrome where specified. Worn cylinder barrels can be honed and internally hard-chromed back to the original size. We supply parts—tubes, rods, pistons and glands—not complete assembled hydraulic cylinders.
Steel, copper and aluminium; hydraulic tubes and cylinders
3. Internal hard chrome
To drawing and access
New bore or worn-barrel size restoration
4. Inspection
To drawing
Inspection report with measured values + material certificate
Standard honed tube or BTA drilling from solid?
Standard cold-drawn honed tubing covers common sizes. BTA drilling from solid bar suits sizes, wall thicknesses, materials or lengths not available as standard honed tube, and parts that need ports, threads or flanges machined in the same process chain.
New long bored parts
We drill the BTA bore with standard tools, leaving a small allowance for honing. Outside-diameter datums, bore axis, honing stock and chrome build-up are planned together.
✓Hydraulic cylinder tubes and barrels
✓Mining, press and machine components
Worn cylinder-barrel refurbishment
Where wear and geometry permit, the existing bore is cleaned up, honed and internally hard-chromed back to the original drawing size. The acceptance size and plated area are defined before processing.
What to send for a quote
Start with a PDF drawing and STEP/STP where available.
✓Blank and final ID/OD plus overall length
✓Material, quantity, bore type and entry/exit conditions
✓Final tolerance, cylindricity, straightness and Ra/Rz
✓New manufacture or refurbishment; current dimensions and photos for worn barrels
Which material is used for hydraulic cylinder tubes?
E355/ST52-type steels are commonly used for honed tubes. For parts drilled from solid, the steel is selected to the drawing; for example, 42CrMo4/4140 may be specified.
What is your BTA drilling capacity?
We drill Ø30–110 mm through solid steel up to 4000 mm in one pass. The bore is left honing-ready.
Do you offer small-diameter gun drilling?
No. We offer BTA only; diameters below Ø30 mm are outside our range.
Which materials can be honed?
We hone steel, copper and aluminium, including hydraulic tubes and cylinders, up to Ø300 mm and 2000 mm long.
Can a worn cylinder barrel be restored to size?
Where geometry permits, the bore can be honed and internally hard-chromed back to original size. Existing wear and the acceptance size are reviewed first.
Do you supply complete hydraulic cylinders?
No. We supply parts such as tubes, rods, pistons and glands, not complete assembled cylinders.
RFQ
Send your drawing for a manufacturing review
Quantity, material, quality requirements and delivery country help us review the appropriate manufacturing and shipment route.