SAE J526 Low-Carbon Steel Galvanized Precision Steel Tube Bundy Tube for Braking Systems
Product Details
SAE J526 Precision Steel Tube
,Low-Carbon Steel Bundy Tube
,Galvanized Hydraulic Tubing
SAE J526 Welded Low-Carbon Steel Tubing (Coiled) for Brake & Hydraulic Lines
Material
SAE J526 tubing is an electric-resistance welded (ERW), single-wall low-carbon steel tube supplied in coils (or straight lengths) for automotive fluid conductor applications where controlled bending, flaring, beading, forming, and brazing are required.
Important design note: SAE J526 material is not intended for single-flare applications due to a potential leak path associated with the internal weld bead/scarfed region; if a single flare is mandatory, the tube selection and risk control should be defined by agreement (or an alternative specification should be selected).
Specifications
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Form supply: Coiled (typical) and straight lengths are available.
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Outside diameter range (reference from tolerance table): 3.18 mm up to 88.90 mm.
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Wall thickness (common J526 tolerance bands shown): 0.64–2.50 mm nominal ranges with defined tolerances by thickness band.
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Dimensional tolerances (examples from SAE J526):
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OD tolerance ranges from ±0.05 mm (3.18 mm OD) up to ±0.23 mm (76.2–88.9 mm OD band).
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Wall tolerance varies by nominal wall band (e.g., ±0.08 to ±0.20 mm depending on thickness range).
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Straightness (straight lengths): 1.0 mm over 1000 mm length (unless waived); does not apply to coiled product.
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Testing basis (typical for this class): commonly performed per SAE test procedures (e.g., tensile/hardness and forming-related tests).
Key Features
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Single-wall ERW construction with controlled external surface after welding for routing and assembly.
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Designed for practical fabrication: bending, beading, forming, and brazing-focused quality.
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Coil-friendly supply supports automated tube forming, cut-to-length, and high-throughput production lines.
Our Advantages (Top 3 Buyer Concerns Solved)
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Flaring & leak-risk control (the #1 brake-line concern)
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We specify SAE J526 clearly and highlight its single-flare limitation up front to prevent wrong-spec sourcing. For brake assemblies, we recommend matching the tube + fitting + flare method to the vehicle standard (double flare / bubble flare as applicable).
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Corrosion protection options for real road environments
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Brake and underbody routing is exposed to salt spray, moisture, and stone impact. We can support corrosion-resistant surface strategies (e.g., zinc plus organic topcoats such as PVF/nylon/epoxy) depending on your durability target and forming requirements.
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Dimensional consistency for automated forming and assembly yield
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Consistent OD/wall tolerances reduce flare variability, clamp-fit issues, and rework. SAE J526 provides defined tolerance bands for OD and wall thickness, which is essential for stable high-volume processing and quality control.
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Chemical Composition
| Grade / Mark | Standard Reference | C | Si | Mn | P | S |
|---|---|---|---|---|---|---|
| UNS G10080 | SAE J526 | ≤0.10 | 0.07–0.60 | 0.30–0.50 | ≤0.03 | ≤0.05 |
| UNS G10100 | SAE J526 | 0.08–0.13 | 0.07–0.60 | 0.30–0.60 | ≤0.03 | ≤0.05 |
| DC01 (1.0330) | EN 10130 | ≤0.12 | — | ≤0.60 | ≤0.045 | ≤0.045 |
| SPCD | JIS G 3141 | ≤0.12 | — | ≤0.50 | ≤0.040 | ≤0.040 |
| Q195 | GB/T 700 | ≤0.12 | ≤0.30 | ≤0.50 | ≤0.035 | ≤0.040 |
Mechanical Properties
| Grade / Mark | Yield / Proof | Tensile Strength | Elongation | Hardness |
|---|---|---|---|---|
| SAE J526 tube (example: UNS G10080) | ≥170 MPa | ≥290 MPa | ≥14% (50 mm) | ≤65 (HR30T) |
| SAE J526 tube (example: UNS G10100) | ≥170 MPa | ≥290 MPa | ≥14% (50 mm) | ≤65 (HR30T) |
| DC01 (1.0330), EN 10130 | 140–280 MPa | 270–410 MPa | ≥28% | HB 85–120 |
| SPCD, JIS G 3141 (0.60–1.0 mm band shown) | ≤240 MPa (informative cap) | ≥270 MPa | ≥38% | Not specified |
| Q195, GB/T 700 | 195 MPa (≤16 mm) / 185 MPa (16–60 mm) | 315–430 MPa | 33% (Ø≤40 mm) | Not listed |
Applicable Standards
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SAE: SAE J526 (ERW single-wall low-carbon steel tubing; coiled/straight; forming-focused).
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ASTM: ASTM A513/A513M (ERW mechanical tubing; often referenced for comparable welded-mechanical tubing families).
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EN: EN 10305 series (precision tubes; e.g., welded cold drawn tubes for hydraulic/pneumatic systems).
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GOST: GOST 10704 / GOST 10705 (longitudinally welded steel tubes—size range and technical requirements).
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JIS: JIS G 3454 (carbon steel pipes for pressure service; referenced in SAE J526 related documents list).
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GB: GB/T 3639 (precision steel tubes used in mechanical/hydraulic/automotive components; widely used in China supply chains).
Application Areas
Primary industry: Automotive fluid conductor systems (brake/hydraulic-related routing), plus general hydraulic, refrigeration, and similar pressure tubing uses.
Where it is used (examples):
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Brake and clutch hydraulic tube routing where the system design matches SAE J526’s forming and flare constraints
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General automotive fluid lines, hydraulic circuits, and assemblies requiring bending/forming and consistent tolerances
If you share your required OD × wall, flare type (double/bubble), coating target, and the destination market standard, I can format a procurement-ready datasheet and inspection checklist to match your drawing and PPAP/MTC expectations.
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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