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.

A Professional Steel Pipes Materials Inventor, Manufacturer And Solution Provider

TORICH INTERNATIONAL LIMITED is a professional inventor, manufacturer, and solution provider of steel pipe materials, integrating production and international trade, specializing in various precision steel pipes. Established in 1997, the factory covers 10,000 square meters, with an annual production capacity of 50,000 tons of steel pipes and a trading and warehousing capacity of 100,000 tons. It employs over 100 people and has more than 30 years of market experience, with products exported to 56 countries and regions.

In 2008, Torich International Limited was established specifically to handle international marketing, with products sold globally.

Main products

1. Seamless precision steel pipes

2. Welded precision steel pipes (including DOM pipes)

3. Precision machinery pipes, bearing pipes

4. Hydraulic cylinder steel pipes, hydraulic telescopic cylinder pipes, honed pipes

5. Stainless steel, alloy steel, niobium-based alloy steel pipes, etc.