Home » Products » Precision Tube » Cylinder Barrel Blanks

Product Category

Cylinder Barrel Blanks


Availability:

Quantity:



Inquire Add to Basket

Cylinder Barrel Blanks are pre-machined seamless tubes with the bore already honed or skived & roller burnished. Cut to exact length and ready for final machining, they eliminate in-house bore finishing and shorten production cycles. Available in carbon, alloy, and stainless steel, with various heat treatments. ID up to 3000 mm, straightness ≤0.3 mm/m, bore roughness Ra ≤0.2 μm. Standard tolerances H7/H8. Ideal for streamlining hydraulic cylinder manufacturing. Custom dimensions, end preparations, and packaging offered.

Model:
PZPT0006
Brand:
PAZON

Cylinder Barrel Blanks Hydraulic Cylinder Blanks Pre-Honed Tube Blanks Cylinder Tube Blanks Honed Barrel Blanks SRB Blanks Barrel Blanks Pre-Machined Cylinder Tube Cylinder Barrel Stock Hydraulic Tube Blanks

Product Description

Our Cylinder Barrel Blanks are ready-to-finish seamless tubes designed to streamline hydraulic cylinder production. Each blank is cut to your specified length and its inner bore is already precision-machined — by honing or skiving and roller burnishing — to achieve tight tolerances, excellent roundness, and a fine surface finish. With critical bore preparation completed, you can move directly to final operations such as end welding, port machining, and external coating, significantly reducing in-house processing time and cost.

Technical Specifications

Inner Diameter: up to 3000 mm
Length: ≤ 16000 mm (cut to exact customer specification)
Straightness: ≤ 0.3 mm/m (honed) / ≤ 0.2 mm/m (SRB)
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
Bore Machining Options:
- Honed: Ra ≤ 0.2 μm, standard tolerance H7/H8 (IT6–IT8)
- Skived & Roller Burnished (SRB): Ra 0.1–0.2 μm, standard tolerance H7/H8/H9 (IT7–IT9)
Heat Treatment (Base Tube):
- Stress Relieved: +SR / BKS
- Annealed: +A / GBK
- Normalized: +N / NBK
- Quenched and Tempered: Q+T
End Preparation: Square cut, chamfered, or weld-prep bevel as ordered
Wall Thickness Tolerance: ±7.5% (±10% for wall thickness > 210 mm)
Surface Protection: Temporary anti-rust oil applied to bore and exterior
Packing: Plastic caps on both ends + wooden case / bundle with steel strip / bundle with knitting strip

Features & Benefits

Ready for Final Machining: Bore is already finished to near-final specifications, eliminating in-house honing or burnishing and freeing up internal capacity.
Faster Production Cycles: By starting with a pre-qualified blank, cylinder assembly lead times are sharply reduced.
Guaranteed Bore Consistency: Every blank is 100% inspected for ID, roundness, straightness, and surface finish, ensuring uniform seal performance in finished cylinders.
Flexible Bore Process: Choose between honed (for ultimate smoothness) or SRB (for surface hardening and efficiency) to match your sealing system and budget.
Material and Heat Treatment Choice: Base tube can be ordered in carbon, alloy, or stainless steel, in stress-relieved, annealed, normalized, or quenched & tempered condition.
Simplified Logistics: Delivered cut to exact length with temporary corrosion protection, ready for immediate machining upon arrival.

Customization Options

We support your production workflow with extensive options:

Custom ID, OD, and wall thickness combinations
Bore processing: honed (H7/H8) or SRB (H7/H8/H9); non-standard tolerances available
Exact cut lengths up to 16 meters
End finishing: plain cut, chamfered, or weld-prep bevel
Base material and heat treatment specification
Temporary rust protection and custom packaging
Full inspection certificates, material certifications, and third-party testing on request

Technical Reference Data

Limits and Fits Table / Inner Diameter

The table below provides the upper (ES) and lower (EI) deviations for standard bore tolerances H7, H8, H9, and H10. Select the required fit when specifying your cylinder barrel blanks. Custom tolerance bands available.

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 typical chemical analyses (C, Si, Mn, P, S, V, Ni, Cr, Al) for the most commonly specified steel grades in cylinder barrel blank production, 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

Cylinder barrel blanks can be ordered in various heat treatment states for the base tube. The table below outlines available conditions: cold drawn (hard), cold drawn & stress relieved, annealed, normalized, and quenched & tempered, with common abbreviations and corresponding DIN/EN references.

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

Typical mechanical properties (tensile strength, yield strength, elongation, and impact values) for the base materials under delivery conditions +C, +SR, +A, and +N. Materials cover 20# (A106, ST45), 45#, Q345B, Q345D, 25Mn, 27SiMn, E355 (ST52), E460, and SAE1026. These values remain valid for the finished blank as machining does not alter bulk properties.

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

-

Nickel/Zinc-Plated Honed Tube Partial Dimensional Specifications (ID × OD)

The table below shows a selection of commonly ordered inner and outer diameter combinations for our cylinder barrel blanks. These pre-machined sizes are available with either a honed or SRB bore finish. Non-standard dimensions can be manufactured to order.

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