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Precision honed tube with ID up to 3000 mm, achieving straightness ≤0.3 mm/m and inner surface roughness Ra ≤0.2 μm. Standard ID tolerances H7/H8, with H6 available on request. Base tubes in carbon, alloy, or stainless steel, offered in various heat treatment conditions. External surface finishes include zinc and nickel plating. Ideal for high-performance hydraulic cylinders, ensuring low friction and long seal life. Custom sizes, tolerances, and packaging offered.

Model:
PZPT0002
Brand:
PAZON

Honed Tube Precision Honed Tube Hydraulic Cylinder Barrel Honed Cylinder Tube ID Honed Tube Honed Seamless Tube Cylinder Honing Honed Bore Tube Precision Honing Honed Steel Tube

Product Description

Our Honed Precision Tubes are manufactured from high-quality seamless steel tubes that undergo a controlled honing process to achieve exceptional inner diameter accuracy, superior roundness, and an ultra-smooth bore finish. Serving as a core component for hydraulic and pneumatic cylinder barrels, these tubes deliver consistent performance, reduced friction, and extended seal life, making them the ideal choice for demanding fluid power applications.

Technical Specifications

Inner Diameter: up to 3000 mm
Length: ≤ 16000 mm
Straightness: ≤ 0.3 mm/m (enhanced by honing process)
Material:
- Carbon Steel: 20# / CK45 / ST52(E355) / 25Mn / E235 / E470
- Alloy Steel: 27SiMn / 42CrMo (AISI 4140) / AISI 4130 / 40Cr / E460 / 20Cr
- Stainless Steel: ASTM 316L / 304
Tolerance Grades: IT6 – IT8 (ID)
ID Tolerance: Typically ISO H7 / H8; H6 and special fits available upon request
Heat Treatment (Base Tube):
- Stress Relieved: +SR / BKS
- Annealed: +A / GBK
- Normalized: +N / NBK
- Quenched and Tempered: Q+T
- Nitrocarburized: QPQ
Surface Treatment: External zinc plating / nickel plating / anti-rust painting (internal bore remains precision honed)
Wall Thickness Tolerance: ±7.5% (±10% for wall thickness > 210 mm)
Inner Surface Roughness: Ra ≤ 0.2 μm
Packing: Anti-rust oil + Plastic caps + Wooden case / Bundle with steel strip / Bundle with knitting strip

Features & Benefits

Ultra-Precise Bore: Achieves tight ID tolerances (H7/H8 typical) and excellent roundness, minimizing internal leakage and improving cylinder efficiency.
Superior Surface Finish: Ra ≤ 0.2 μm dramatically reduces friction, protects seals, and prolongs service intervals.
Enhanced Straightness: Straightness ≤ 0.3 mm/m ensures smooth piston travel and reduces misalignment wear.
Versatile Material & Heat Treatment: Base tubes can be supplied in carbon, alloy, or stainless steel, with a full range of heat treatment conditions to meet strength and durability requirements.
Reliable Consistency: The honing process removes surface imperfections and residual stress, delivering a dimensionally stable bore ready for assembly.

Customization Options

We provide extensive customization to match your exact cylinder design:

Custom ID dimensions and tolerance grades (including H6 and non-standard fits)
Specific base tube material and heat treatment (normalized, Q&T, etc.)
External surface treatments (zinc, nickel, paint)
Non-standard lengths up to 16 meters
Honed blind-end or stepped bores
100% inspection reports, material certifications, and third-party testing

Technical Reference Data

Limits and Fits Table / Inner Diameter

The table below shows the upper (ES) and lower (EI) deviations for standard honed bore tolerances H7 and H8. These are the typical fits used for hydraulic cylinder assemblies. Tighter tolerances (H6) and special limits can be supplied on request.

Limits and Fits Table / Inner Diameter
ID / mm	H7		H8		H9		H10
ID / mm	ES	EI	ES	EI	ES	EI	ES	EI
>6-10	+0.015	0	+0.022	0	+0.036	0	+0.058	0
>10-18	+0.018	0	+0.027	0	+0.043	0	+0.070	0
>18-30	+0.021	0	+0.033	0	+0.052	0	+0.084	0
>30-50	+0.025	0	+0.039	0	+0.062	0	+0.100	0
>50-80	+0.030	0	+0.046	0	+0.074	0	+0.120	0
>80-120	+0.035	0	+0.054	0	+0.087	0	+0.140	0
>120-180	+0.040	0	+0.063	0	+0.100	0	+0.160	0
>180-250	+0.046	0	+0.072	0	+0.115	0	+0.185	0
>250-315	+0.052	0	+0.081	0	+0.130	0	+0.210	0
>315-400	+0.057	0	+0.089	0	+0.140	0	+0.230	0
>400-500	+0.063	0	+0.097	0	+0.155	0	+0.250	0
>500-630	+0.070	0	+0.110	0	+0.175	0	+0.280	0
>630-800	+0.080	0	+0.125	0	+0.200	0	+0.320	0
>800-1000	+0.090	0	+0.140	0	+0.230	0	+0.360	0
>1000-1250	+0.105	0	+0.165	0	+0.260	0	+0.420	0
>1250-1600	+0.125	0	+0.195	0	+0.310	0	+0.500	0
>1600-2000	+0.150	0	+0.230	0	+0.370	0	+0.600	0
>2000-2500	+0.175	0	+0.280	0	+0.440	0	+0.700	0
>2500-3150	+0.210	0	+0.330	0	+0.540	0	+0.860	0

Chemical Composition

This table lists the typical chemical analysis (C, Si, Mn, P, S, V, Ni, Cr, Al) for the most frequently specified steel grades used in the production of our honed tubes, including 20#, 45#, Q345B/D, 25Mn, 27SiMn, E355 (ST52), SAE1026, E460, 4130, and 4140.

Chemical Composition
Material	C%	Si%	Mn%	P%	S%	V%	Ni%	Cr%	Al%
20#	0.17-0.24	0.17-0.37	0.35-0.65	≤0.035	≤0.035	/	≤0.250	≤0.250	/
45#	0.42-0.50	0.17-0.37	0.50-0.80	≤0.035	≤0.035	/	≤0.300	≤0.250	/
Q345B	≤0.20	≤0.50	1.00-1.60	≤0.030	≤0.030	≤0.080	≤0.250	≤0.030	/
Q345D	≤0.20	≤0.50	1.00-1.60	≤0.030	≤0.030	≤0.150	≤0.250	≤0.250	≥0.015
25Mn	0.22-0.29	0.17-0.37	0.70-1.00	≤0.035	≤0.035	/	/	/	/
27SiMn	0.24-0.32	1.10-1.40	1.10-1.40	≤0.035	≤0.035	/	≤0.300	≤0.300	/
E355(ST52)	≤0.22	≤0.55	≤1.60	≤0.025	≤0.025	/	≤0.250	≤0.250	/
SAE1026	0.22-0.28	0.15-0.35	0.60-0.90	≤0.040	≤0.050	/	/	/	/
E460	≤0.22	≤0.60	1.20-1.60	≤0.030	≤0.030	≤0.200	≤0.800	≤0.300	≥0.020
4130	0.28-0.33	0.15-0.35	0.40-0.60	≤0.040	≤0.040	/	/	0.80-1.10	/
4140	0.36-0.43	0.15-0.35	0.75-1.00	≤0.040	≤0.040	/	/	0.80-1.10	/

Delivery Condition

The table below details the common delivery conditions for our honed tubes, referring to the heat treatment state of the base tube prior to final honing. Available conditions include stress relieved, annealed, normalized, and quenched & tempered, each with standard abbreviations and corresponding EN/DIN designations.

Delivery Condition
Condition Category	Common Abbreviation	DIN No.	Notes
Cold drawn (Hard)	+C	BK	Thermal treatment shall not be used after final cold-drawing or cold-rolling.
Cold drawn and stress released	+SR	BKS	Stress relief annealing of steel tube shall be conducted after final cold-drawing or cold-rolling.
Annealed	+A	GBK	Annealing of steel tube shall be conducted after final cold-drawing.
Normalized	+N	NBK	Normalizing of steel tube shall be conducted after final cold-forming.
Quenched and tempered	Q+T		Quenching and tempering of steel tube shall be conducted after final cold-forming or normalizing.

Mechanical Properties

The table below provides the typical mechanical properties — tensile strength, yield strength, elongation, and impact values — for the base tube materials in various heat treatment conditions (+C, +SR, +A, +N). As honing does not alter bulk mechanical properties, these values remain valid for the finished honed tube.

Mechanical Properties

Material

+C

+SR

+A

+N

T.S.

E.L.

T.S.

Y.S.

E.L.

Impact Value

T.S.

E.L.

T.S.

Y.S.

E.L.

Impact Value

Rm/MPa

A/%

Rm/MPa

Rel/MPa

A/%

KV2/J(-20°C)

Rm/MPa

A/%

Rm/MPa

Rel/MPa

A/%

KV2/J(-20°C)

20#(A106, ST45)

≥550

≥8

≥520

≥375

≥15

-

≥390

≥21

≥440

≥255

≥21

-

45#

≥650

≥5

≥600

≥520

≥10

-

≥390

≥14

≥540

≥340

≥18

-

Q345B

≥640

≥5

≥600

≥520

≥14

-

≥450

≥22

≥490

≥355

≥22

34

Q345D

≥640

≥5

≥600

≥520

≥14

27

≥450

≥22

≥490

≥355

≥22

34

25Mn

≥640

≥5

≥600

≥510

≥15

-

≥430

≥20

≥460

≥300

≥20

-

27SiMn

≥800

≥5

≥760

≥610

≥10

-

≥600

≥10

-

≥430

≥14

-

E355(ST52)

≥640

≥5

≥600

≥520

≥14

-

≥450

≥22

≥490

≥355

≥22

34

E460

≥690

≥620

≥13

-

≥650

-

SAE1026

≥640

≥5

≥600

≥510

≥15

-

≥430

≥20

≥460

≥300

≥20

-

Honed Tube Partial Dimensional Specifications (ID × OD)

The table below presents a selection of commonly stocked inner and outer diameter combinations for our honed precision tubes. These sizes cover the most frequent hydraulic cylinder barrel requirements. Non-standard dimensions are available upon request.

Honed Tube Partial Dimensional Specifications (ID × OD)
ID / mm	OD / mm	ID / mm	OD / mm	ID / mm	OD / mm	ID / mm	OD / mm	ID / mm	OD / mm
40	50	90	110	135	159	190	210	300	351
40	55	90	114	135	160	190	215	300	356
50	55	95	110	140	152	190	220	300	377
50	60	95	115	140	159	190	225	320	340
50	63	100	107	140	160	200	213	320	351
50	65	100	107	140	165	200	216	320	356
50	68	100	108	140	168	200	219	320	370
50	70	100	110	140	170	200	220	320	377
55	70	100	112	140	180	200	225	320	402
60	70	100	114	145	170	200	230	320	426
60	73	100	115	150	160	200	232	350	370
60	75	100	120	150	168	200	235	350	377
60	76	100	118	150	170	200	245	350	400
60	78	100	121	150	175	200	250	350	402
60	80	100	125	150	180	220	235	350	426
63	73	100	127	150	194	220	240	360	380
63	75	105	125	155	180	220	245	360	402
63	76	110	120	160	168	220	250	360	426
63	78	110	121	160	170	220	255	360	450
63	83	110	125	160	175	220	260	360	480
65	80	110	127	160	180	220	266	380	426
65	85	110	130	160	184	220	270	400	420
65	90	110	133	160	185	220	273	400	440
70	80	110	140	160	190	225	250	400	450
70	82	110	146	160	194	230	245	400	460
70	83	115	130	160	195	230	260	400	470
70	85	115	135	160	203	230	273	400	480
70	90	120	130	165	190	240	273	400	490
70	95	120	140	165	205	250	266	400	500
75	85	120	145	170	200	250	273	400	508
75	90	125	132	180	194	250	280	400	520
75	95	125	133	180	200	250	290	400	550
80	86	125	135	180	203	250	299	420	440
80	90	125	140	180	205	250	300	420	510
80	92	125	145	180	208	250	325	420	550
80	93	125	150	180	210	250	351	450	550
80	95	125	152	180	213	260	300	450	470
80	100	125	159	180	215	280	299	500	530
80	102	125	168	180	216	280	323	500	590
80	108	130	150	180	219	280	325	570	600
85	100	130	152	180	220	280	355	580	620
90	100	130	155	180	235	288	351	600	630
90	102	130	156	185	205	288	377	600	720
90	105	130	159	185	215	300	320	700	850
90	108	130	160	185	220	300	350	800	1000

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