ASTM A500 metric rectangular tubing · Full lengths and fabricated parts
We manufacture rectangular steel tubing for wholesale and project orders from our factories in China. Supply includes 6 m and 12 m lengths, cut parts and welded components. The catalog below covers unequal-sided sections from 50 × 30 to 400 × 200 mm, with mill-finish, painted and galvanized options.
Rectangular tubing is available as full lengths or prepared rails and frame members. The wider and narrower faces are identified on the drawing wherever a cut, hole or mounting plate depends on orientation.
Long rails need to match both the available space and the connection details. Full-length tubing gives your workshop control of the cutting layout; prepared rails can include the specified end cuts and attachment holes. We quote either format against your member list.
The broad face provides space for equipment feet or mounting plates while the shallow side fits restricted frame depth. A repeated base order can combine the selected RHS with prepared members, reducing the number of separate material purchases.
| Item | Supply Range |
|---|---|
| Product | Carbon steel rectangular hollow sections (RHS / rectangular HSS) |
| Tube manufacture | Cold-formed welded tube with unequal adjacent sides |
| Standard & grade | ASTM A500/A500M, Grade B or Grade C as ordered |
| Catalog sections | Selected metric sections from 50 × 30 to 400 × 200 mm |
| Nominal wall | 1.0–12.0 mm across the listed sections; see each row |
| Length | 6 m or 12 m mill lengths; finished cut lengths to order |
| Uncoated supply | Black mill finish or oiled surface |
| Coated supply | Painted or hot-dip galvanized to the required finish |
| Cut ends | Straight cuts, miters and end preparation to drawing |
| Additional fabrication | Deburring, holes, plates and welded components |
| Material documents | Grade and batch identity with the ordered inspection records |
| Packing identity | Outside sides, wall, length and order-line reference |
RHS wall is quoted as a thickness in millimeters or inches, rather than a pipe schedule.
These metric sections cover 50 × 30 through 400 × 200 mm. Each row has its own nominal wall range, with converted inch values alongside it.
Swipe left to see all columns.
| Outside sides A × B (mm) | Outside sides (in., converted) | Wall range (mm) | Wall range (in., converted) |
|---|---|---|---|
| 50 × 30 | 1.969 × 1.181 | 1.0–3.0 | 0.039–0.118 |
| 60 × 40 | 2.362 × 1.575 | 1.5–3.5 | 0.059–0.138 |
| 75 × 50 | 2.953 × 1.969 | 1.5–4.0 | 0.059–0.157 |
| 80 × 40 | 3.150 × 1.575 | 1.5–4.0 | 0.059–0.157 |
| 100 × 50 | 3.937 × 1.969 | 2.0–6.0 | 0.079–0.236 |
| 100 × 60 | 3.937 × 2.362 | 2.0–6.0 | 0.079–0.236 |
| 100 × 75 | 3.937 × 2.953 | 2.0–6.0 | 0.079–0.236 |
| 120 × 60 | 4.724 × 2.362 | 3.0–6.0 | 0.118–0.236 |
| 120 × 80 | 4.724 × 3.150 | 3.0–6.0 | 0.118–0.236 |
| 150 × 75 | 5.906 × 2.953 | 3.0–6.0 | 0.118–0.236 |
| 150 × 100 | 5.906 × 3.937 | 4.0–12.0 | 0.157–0.472 |
| 200 × 100 | 7.874 × 3.937 | 4.0–12.0 | 0.157–0.472 |
| 200 × 150 | 7.874 × 5.906 | 4.0–12.0 | 0.157–0.472 |
| 250 × 150 | 9.843 × 5.906 | 5.0–12.0 | 0.197–0.472 |
| 300 × 200 | 11.811 × 7.874 | 5.0–12.0 | 0.197–0.472 |
| 400 × 200 | 15.748 × 7.874 | 5.0–12.0 | 0.197–0.472 |
The quotation identifies the complete section, wall, grade, length and finish. Weight-based purchases also state the quantity and quoted weight basis, making material and fabrication costs easier to compare.
Open our BAOLAI rectangular-section catalog (PDF, pages 65–66)
We quote cut lengths, miters and holes from the part drawing, with the working face and orientation retained. Full-length RHS remains available for cutting and drilling in your own workshop.
Miter cuts are defined by their plane, angle and long- or short-point length. Holes use a reference face and end datum. Left- and right-hand parts stay separate on the cutting list when an assembly uses mirrored members.
Mill-finish or oiled tube is suited to further shop work. For a finished frame, cutting and welding need to be coordinated with painting or galvanizing. Coated mating surfaces also need room for the finish within the specified fit.
Inspection covers section shape, twist, straightness and prepared features. Finished rails are checked against the drawing and the locating points used in the assembly.
The welded tube is sized into an unequal-sided profile before cutting. The long and short faces, corner shape and weld seam become reference features for later fabrication. The ordered grade remains part of the material identification through production.
A long rail is checked along its locating span, where twist or bow can lift it away from the fixture. The agreed contact points and acceptance method connect the inspection to how the part actually sits in the assembly.
Grade and batch references connect the rectangular tube to the documents required for the order.
Both outside sides, wall and finished length are checked against the listed section and tolerances.
Cuts and holes are checked from the drawing datum and orientation marks. Left- and right-hand members keep their own part references before packing.
The purchase specification identifies required material reports, dimensional records and any third-party inspection before shipment.
The linked BAOLAI library provides factory QC procedures and earlier pipe reports for reference. Records for your RHS order identify its own material grade, batch and agreed profile or finished-part checks.
View BAOLAI inspection documentationBundle labels identify the outside dimensions, wall, grade, length and order line. Prepared parts retain their own references for allocation to the correct frame or assembly.
Timber supports keep bundles raised, with secured bands and contact protection for coated faces. The receiving plan needs the bundle length and weight as well as the available lifting equipment. Cut pieces are packed separately from full-length rails.
Standard production takes 15–30 days depending on section and quantity; fabrication and finish affect the confirmed schedule. FOB, CFR and CIF terms are available. The named port and shipping scope are stated separately from the factory production period.
Material, cutting, fabrication, finish and freight are priced separately. You can order raw lengths, prepared parts or a combination of both.
RHS means rectangular hollow section. Rectangular HSS is the corresponding structural-tubing term commonly used in the US. Neither name replaces the material specification: this page covers ASTM A500 Grade B or C supply.
Yes. Give each size and finished part its own line, quantity and drawing reference. That keeps full lengths, mirrored parts and coated components identifiable through the quotation and packing list.
Trial-order requirements are reviewed by section, wall and processing scope. Any production minimum is identified against the relevant line before the order is placed, including when several sizes ship together.
The material callout needs to be reviewed first. A513 covers mechanical tubing; A500 covers structural tubing. Equal outside dimensions do not make the specifications interchangeable, and a drawing that calls for A513 should retain that requirement.
Those lengths are different: 20 ft is 6.096 m and 40 ft is 12.192 m. Keep the required finished length and unit on the material list. We review it as a specific length request rather than substituting the nearest metric mill length.
Third-party inspection can be arranged with the order. Specify the records, dimensional checks and any witness points required so the inspection schedule fits the production and dispatch plan.
Attach the material list and note the destination, or enter the section sizes and quantities. A part drawing can cover the reference faces, cuts and holes without repeating them in the message. We return an itemized material, fabrication and delivery quote.