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

• Form supply: Coiled (typical) and straight lengths are available.

• Outside diameter range (reference from tolerance table): 3.18 mm up to 88.90 mm.

• Wall thickness (common J526 tolerance bands shown): 0.64–2.50 mm nominal ranges with defined tolerances by thickness band.

• Dimensional tolerances (examples from SAE J526):

  • OD tolerance ranges from ±0.05 mm (3.18 mm OD) up to ±0.23 mm (76.2–88.9 mm OD band).

  • Wall tolerance varies by nominal wall band (e.g., ±0.08 to ±0.20 mm depending on thickness range).

• Straightness (straight lengths): 1.0 mm over 1000 mm length (unless waived); does not apply to coiled product.

• Testing basis (typical for this class): commonly performed per SAE test procedures (e.g., tensile/hardness and forming-related tests).

Key Features

• Single-wall ERW construction with controlled external surface after welding for routing and assembly.

• Designed for practical fabrication: bending, beading, forming, and brazing-focused quality.

• Coil-friendly supply supports automated tube forming, cut-to-length, and high-throughput production lines.

Our Advantages (Top 3 Buyer Concerns Solved)

1. Flaring & leak-risk control (the #1 brake-line concern)

   • 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).

2. Corrosion protection options for real road environments

   • 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.

3. Dimensional consistency for automated forming and assembly yield

   • 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.

Chemical Composition 

Mechanical Properties

Applicable Standards

• SAE: SAE J526 (ERW single-wall low-carbon steel tubing; coiled/straight; forming-focused).

• ASTM: ASTM A513/A513M (ERW mechanical tubing; often referenced for comparable welded-mechanical tubing families).

• EN: EN 10305 series (precision tubes; e.g., welded cold drawn tubes for hydraulic/pneumatic systems).

• GOST: GOST 10704 / GOST 10705 (longitudinally welded steel tubes—size range and technical requirements).

• JIS: JIS G 3454 (carbon steel pipes for pressure service; referenced in SAE J526 related documents list).

• 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):

• Brake and clutch hydraulic tube routing where the system design matches SAE J526’s forming and flare constraints

• 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.