Welcome to our premier selection of DIN2391-1 Honing Tubes, the industry benchmark for high-precision seamless steel tubes used in hydraulic and pneumatic cylinders. These cold-drawn seamless (CDS) tubes are specifically engineered with an internal honed surface finish and tight dimensional tolerances, ready to serve as reliable cylinder barrels and piston tubes. Manufactured to the rigorous DIN 2391-1 standard, our tubes guarantee exceptional structural integrity, surface quality, and machinability, making them the ideal choice for demanding applications in mobile hydraulics, industrial machinery, and automation systems.
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Products Description
Standard: DIN 2391-1
Materials: St45
Technical: cold-drawn seamless
Delivery Condition: BK.BKW,BK+S,GBK,NBK
Straightness: 0.5mm/1m max for tubes below 3m,0.8mm/1m max for tubes between 3 to 6m, 1.2mm/1m for tubes above 6m
Technology: honed & SRB(Skived and Roller Burnished).
Application: used in the hydraulic cylinder of the Heavy Machinery, Cranes, Excavator, and Forklifts.
Products Specifications
| Product | DIN 2391-1 honed seamless steel tube for hydraulic cylinder |
| Standard | DIN 2391-1 |
| Materials | St35,St45,St52 |
| Outside diameter | 30-280mm |
| Wall thickness | 2-25mm |
| Length | 3m-8m |
| Delivery Condition | BK(Cold Drawn,Hard),BKW(Cold Drawn,Soft),BKS(Cold Drawn,Stress Relieved),GBK(Annealed),NBK(Normalized) |
| MOQ | 2TON |
| package | Oil dipped surface,small diameter packed in wooden boxes,large diameter wrapped with woven bags,tied with steel strips |
| shippment | 20GP/40GP/40HQ FCL OR LCL |
| incoterms | EXW FOB CFR CIF |
| payment | 30%TT deposit,70% balance before shipment |
| delivery | Depends on the stock availability and actual order quantities |
St45 Dimension Tolerance：
| OD(mm) | ID(mm) | Tolerance | ||
| OD(mm) | ID(mm) | W.T(mm) | ||
| 40-74 | 30-65 | 士 0.01 | -0.3-0.5 | ≤0.5 |
| 74-98 | 65-85 | 士0.01 | -0.4-0.6 | ≤0.5 |
| 100-116 | 85-100 | 士 0.02 | -0.4-0.6 | ≤0.6 |
| 124-134 | 110-115 | 士 0.02 | -0.6-0.8 | ≤0.6 |
| 140-158 | 120-135 | 士 0.02 | -0.7-0.9 | ≤0.8 |
| 165-176 | 140-150 | 士 0.02 | -0.7-0.9 | ≤0.8 |
| 188-203 | 160-180 | 士 0.02 | -0.7-0.9 | ≤0.8 |
St45 Honed Tolerance:
| ID size | ID deviation(mm) | |||
| H7 | H8 | H9 | H10 | |
| 30 | +0.021 | +0.033 | +0.052 | +0.084 |
| >30-50 | +0.025 | +0.039 | +0.062 | +0.100 |
| >50-80 | +0.030 | +0.046 | +0.074 | +0.120 |
| >80-120 | +0.035 | +0.054 | +0.087 | +0.140 |
| >120-180 | +0.040 | +0.063 | +0.100 | +0.160 |
| >180-250 | +0.046 | +0.072 | +0.115 | +0.185 |
| >250-315 | +0.052 | +0.081 | +0.130 | +0.210 |
| >315-400 | +0.0527 | +0.089 | +0.140 | +0.230 |
FAQ
Q1: What does "Honing" mean in DIN2391-1 Honing Tube?
A: Honing is a precision machining process that creates a superior surface finish on the inside diameter (ID) of the tube. This honed surface provides an ideal sealing surface for pistons, reduces friction, and ensures smooth operation of the hydraulic cylinder.
Q2: What is the difference between DIN 2391-1 C and HC states?
A: The C state (Cold-worked) offers high strength from the cold-drawing process. The HC state (Hardened + Cold-worked) undergoes an additional heat treatment (hardening) before the final cold-drawing, resulting in the highest possible tensile strength and yield point for the most demanding high-pressure applications.
Q3: Can I machine these tubes directly without any further internal boring?
A: Yes, absolutely. The primary advantage of DIN2391-1 Honing Tubes is that they are supplied as precision cylinder barrels, ready for use. You can typically proceed directly with machining the external features (like threading for end caps) without the need for internal boring or honing, saving significant time and cost.
Q4: How does DIN2391-1 compare to ASTM A513 tubing?
A: While both are for mechanical tubing, DIN2391-1 is a more specialized standard specifically for hydraulic cylinders. It mandates stricter tolerances on dimensions, straightness, and especially the internal surface finish (honing) compared to the more general-purpose ASTM A513. DIN2391-1 is a "ready-to-use" solution, whereas A513 often requires extensive internal machining.
Q5: What tolerance classes are available under DIN 2391-1?
A: DIN 2391-1 defines several tolerance classes for outside diameter and wall thickness. The most common for honed tubes are:
h8 / h9 for outside diameter (fairly tight tolerance).
H10 / H11 for inside diameter after honing.
Please consult with us for the specific tolerance class suitable for your application.
Q6: Do you offer custom cutting and chamfering services?
A: Yes, we provide value-added services including precision cutting to your required length, deburring, and chamfering of both ID and OD edges to facilitate easier welding and assembly.
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