I.D x O.D rr. m Ø	I.D x O.D rr. m Ø	I.D x O.D rr. m Ø	I.D x O.D rr. m Ø
20x30	60x80	100x115	150x180
30x40	63x75	100x120	160x180
35x41	65x80	100x125	160x190
38x50	70x80	110x125	180x200
40x50	70x85	125x140	200x230
50x60	80x95	125x150	250x290
50x70	80x100	140x160
60x70	85x100	150x170
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Corrosion resistant OD chrome tube for demanding hydraulic uses

In high-performance hydraulic systems, the reliability and durability of cylinder components are paramount. One such component, the ID honed and OD chrome tube, plays a critical role in supporting both internal precision and external durability. This advanced chrome tube is engineered for applications where internal accuracy and external resistance to wear and corrosion are essential, especially in telescopic and multi-stage hydraulic cylinders.

An ID honed and OD chrome tube is a seamless steel tube that undergoes two precision treatments: internal honing and external hard chrome plating. The inner diameter (ID) is honed to exacting tolerances—commonly H7, H8, or H9—with a surface roughness as low as Ra ≤ 0.2 μm. This ensures minimal friction, exceptional roundness, and superior sealing performance for hydraulic pistons. Meanwhile, the outer diameter (OD) is coated with a hard chrome layer, typically 15 to 20 μm thick, delivering surface hardness exceeding HV 850 and exceptional protection against corrosion, abrasion, and mechanical impact.

The use of such dual-treated ID honed and OD chrome tube offers several performance benefits:
1. Superior internal precision: The honed ID provides smooth operation, longer seal life, and reduced energy loss due to lower fluid resistance.
2. Outstanding external durability: The OD chrome layer shields the surface from environmental elements such as moisture, chemicals, and contaminants.
3. Excellent dimensional stability: The ID honed and OD chrome tube maintains roundness and straightness (1–1.2/1000mm), even under extreme pressures and telescopic movement.
4. Extended service life: By reducing wear on both internal and external surfaces, maintenance intervals are extended, and system reliability is improved.

This type of chrome tube is manufactured using high-strength steel grades such as EN 1.0580, E355, JIS STKM13C, DIN ST52, and SAE1020, ensuring both mechanical performance and adaptability. Standard dimensions range from 18 mm to 300 mm in ID, with customised lengths available for customized requirements.

Commonly used in telescopic hydraulic cylinders, waste handling vehicles, dump trucks, mobile cranes, lifting equipment, and other demanding fluid power applications, these chrome tubes offer a superior alternative to conventional tubing. They ensure the perfect balance between precision engineering and resistance to aggressive operational environments.

When optimal sealing, minimal maintenance, and long-term resistance to wear and corrosion are required, the ID honed and OD chrome tube remains the preferred solution for advanced hydraulic system design.

High-Performance Telescopic Cylinder Chrome Tube for Demanding Applications

In advanced hydraulic engineering, especially in mobile and heavy-duty applications, the telescopic cylinder chrome tube plays a vital role in delivering both structural functionality and surface precision. Specifically designed for multi-stage hydraulic cylinders, this high-grade chrome plated steel tube is engineered to perform dual functions—serving both as the internal surface for guiding hydraulic pistons and as the external moving stage in telescopic mechanisms.

Why Is It More Expensive Than Standard Tubes?
The chrome plated steel tube used for telescopic applications involves multiple high-precision manufacturing steps that contribute to its elevated cost:
1. Cold drawing or hot rolling to produce the seamless base tube.
2. Honing or skiving & roller burnishing of the internal surface for ID precision and low friction.
3. Surface preparation and electroplating of the OD with industrial-grade hard chrome.
4. Stringent quality inspections, including checks for straightness (1.0–1.2/1000 mm), roundness, concentricity, and uniform chrome thickness.
Additionally, hard chrome electroplating is subject to strict environmental standards such as REACH compliance, which adds to production complexity and cost. Nonetheless, the finished product delivers unmatched value in terms of performance, reliability, and reduced long-term maintenance, particularly in harsh environments.

ID honed OD chrome tubes are used in conjunction with other chrome tubes. Chrome plated steel tubes are often integrated with standard honed tubes and chrome plated steel tubes in the construction of hydraulic cylinder assemblies. In multi-stage telescopic systems:
1. ID honed OD chrome tubes act as moving stages, with their OD serving as the piston rod for the next stage.
2. Standard honed tubes form the base or fixed barrel of the cylinder.
3. Hard chrome plated rods (made from high-strength stainless or carbon steel) move inside these tubes to complete the actuation system.
This combination allows engineers to optimize the design of telescopic hydraulic cylinders, making them compact, corrosion-resistant, and capable of enduring heavy-duty operations.

Application in Telescopic Cylinders:
The telescopic cylinder chrome tube is specifically engineered for multi-stage cylinders that must extend and retract in limited space while enduring variable loads. These cylinders are commonly used in:
1. Dump trucks and refuse compactors
2. Mobile cranes and aerial work platforms
3. Agricultural harvesters and loaders
4. Marine lifting equipment
5. Construction and mining machinery

In such systems, the chrome plated steel tube must fulfill two roles:
Internally: provide a smooth, wear-resistant surface for the piston and seals.
Externally: resist corrosion and wear as it acts like a piston rod exposed to the environment.
Only ID honed OD chrome tubes that have undergone both internal honing and external hard chrome plating can meet these dual-performance requirements.

For engineers and manufacturers who demand top-tier performance in space-restricted, high-pressure, and environmentally aggressive applications, the telescopic cylinder chrome tube offers the ideal solution. As a precision-engineered chrome plated steel tube, it ensures long-term reliability, smooth actuation, and reduced total cost of ownership due to lower maintenance requirements. By combining honed ID and hard-chromed OD features in one seamless component, this tubing technology is the backbone of high-performance telescopic hydraulic cylinders across a wide range of industries.

Tolerance Of Piston Rod

Grade of tolerance Dia mm Φ	f		g	h
Grade of tolerance Dia mm Φ	f7	f8	g6	h7	h8	h9
3mm	-0.006 -0.016	-0.006 -0.020	-0.002 -0.008	0 -0.010	0 -0.014	0 -0.025
3mm-6mm	-0.010 -0.022	-0.010 -0.028	-0.004 -0.012	0 -0.012	0 -0.018	0 -0.030
6mm-10mm	-0.013 -0.028	-0.013 -0.035	-0.005 -0.014	0 -0.015	0 -0.022	0 -0.036
10mm-18mm	-0.016 -0.034	-0.016 -0.043	-0.006 -0.017	0 -0.018	0 -0.027	0 -0.043
18mm-30mm	-0.020 -0.041	-0.020 -0.053	-0.007 -0.020	0 -0.021	0 -0.033	0 -0.052
30mm-50mm	-0.025 -0.050	-0.025 -0.064	-0.009 -0.025	0 -0.025	0 -0.039	0 -0.062
50mm-80mm	-0.030 -0.060	-0.030 -0.079	-0.010 -0.029	0 -0.030	0 -0.046	0 -0.074
80mm-120mm	-0.036 -0.071	-0.036 -0.090	-0.012 -0.034	0 -0.035	0 -0.054	0 -0.087
120mm-180mm	-0.043 -0.083	-0.043 -0.106	-0.014 -0.039	0 -0.040	0 -0.063	0 -0.100
180mm-250mm	-0.050 -0.096	-0.050 -0.122	-0.015 -0.044	0 -0.046	0 -0.072	0 -0.115
250mm-315mm	-0.056 -0.108	-0.056 -0.137	-0.017 -0.049	0 -0.052	0 -0.081	0 -0.130
315mm-400mm	-0.062 -0.119	-0.062 -0.151	-0.018 -0.054	0 -0.057	0 -0.089	0 -0.140
400mm-500mm	-0.068 -0.131	-0.068 -0.165	-0.020 -0.060	0 -0.063	0 -0.097	0 -0.155

(unit)µ=0.001mm

Tolerance Of Honed Tube

Grade of tolerance Dia mm Φ	H
Grade of tolerance Dia mm Φ	H7	H8	H9	H10
3mm	+0.010 0	+0.014 0	+0.025 0	+0.040 0
3mm-6mm	+0.012 0	+0.018 0	+0.030 0	+0.048 0
6mm-10mm	+0.015 0	+0.022 0	+0.036 0	+0.058 0
10mm-18mm	+0.018 0	+0.027 0	+0.043 0	+0.070 0
18mm-30mm	+0.021 0	+0.033 0	+0.052 0	+0.084 0
30mm-50mm	+0.025 0	+0.039 0	+0.062 0	+0.100 0
50mm-80mm	+0.030 0	+0.046 0	+0.074 0	+0.120 0
80mm-120mm	+0.035 0	+0.054 0	+0.087 0	+0.140 0
120mm-180mm	+0.040 0	+0.063 0	+0.100 0	+0.160 0
180mm-250mm	+0.046 0	+0.072 0	+0.115 0	+0.185 0
250mm-315mm	+0.052 0	+0.081 0	+0.130 0	+0.210 0
315mm-400mm	+0.057 0	+0.089 0	+0.140 0	+0.230 0
400mm-500mm	+0.063 0	+0.097 0	+0.155 0	+0.250 0

(unit)µ=0.001mm

ID Honed and OD Chrome Tube, Chrome Plated Steel Tube, Chrome Tube, Telescopic Cylinder Chrome Tube