Cold Drawn Flat Steel Bar
Junxiong Metal manufactures cold drawn flat steel bars for machining, brackets, mounting parts, tools, mechanical components and industrial hardware. Width, thickness, material grade, edge condition, tolerance, length and export packing can be quoted according to your drawing or purchase specification.
Short Answer: Cold Drawn Flat Steel Bar for OEM Buyers
Junxiong Metal supplies cold drawn flat steel bars for machining, armoured joint components, brackets, guide parts, cabinet frame connector blanks and other OEM steel parts. Buyers can send material grade, width, thickness, tolerance, cut length, surface requirement, quantity, drawing and destination country for quotation.
Quote a flat bar: send the grade, width x thickness, edge condition, tolerance, length, quantity and destination through our technical inquiry form or WhatsApp +86 137 7146 9005.
Technical Facts for Cold Drawn Flat Steel Bar Buyers
| Product form | Cold drawn flat steel bar, custom width flat bar, cut-to-length flat bar and flat steel blanks for further machining. |
|---|---|
| Material options | Carbon steel, medium carbon steel, free cutting steel and stainless steel can be reviewed by drawing and order requirement. Common inquiry grades include Q235B / S235JR / A36, 1045 / C45, 1215 / 12L14 / 11SMn30 / 11SMnPb30, and stainless grades such as 304 / 201 / 430 / 430F where applicable. |
| Quotation data | Width, thickness, length, tolerance, edge condition, straightness, surface finish, grade standard, quantity and packing requirement. |
| Secondary processing | Cut-to-length, anti-rust packing, export bundling and selected punching or galvanizing requirements can be reviewed before quotation. |
| Common applications | Machined plates, mounting brackets, armoured joint flat steel, industrial hardware, guide parts, connector blanks and custom OEM assemblies. |
| Documents | Material test certificates, packing details and inspection requirements can be discussed according to the purchase order. |
Buyer Checklist Before Quoting Cold Drawn Flat Steel Bar
- Material grade and standard, such as Q235B, S235JR, 1045, C45, 1215, 12L14, 11SMn30 or 11SMnPb30.
- Width, thickness, length and tolerance requirement.
- Surface requirement: bright drawn, anti-rust oil, galvanized or other agreed finish.
- Edge condition, straightness and flatness requirement.
- Whether the flat bar will be machined, punched, welded, galvanized or used as a finished blank.
- Annual or trial quantity, packing method and destination country.
- Dimensioned cross-section drawing for a non-standard size; a sample photo may support discussion but does not replace dimensions, tolerances or the ordered standard.
Common Grade Routes for Cold Drawn Flat Bar RFQs
Flat-bar buyers should pair the material request with width x thickness, edge condition, flatness, straightness and cut length. The grade groups below are inquiry routes, not a claim that every size is stocked or that cross-standard names are identical.
| Flat-bar search route | Buyer must add | Evidence boundary |
|---|---|---|
| SAE 1117 flat-bar RFQs, SAE 1141 flat-bar RFQs, 1215 and 12L14 flat bar | Governing SAE or customer standard, lead restriction, width, thickness, edge form, length and machining use. | Use the free-cutting steel shape selector; do not infer substitution among 1117, 1141, 1144, 1215, 12L14, 11SMn or SUM designations from a search term. |
| C15 / S15C / SAE 1015 flat-bar RFQs, C35 / S35C / SAE 1035 flat-bar RFQs, EN3B / 070M20 flat-bar RFQs, 1018 flat bar, 1020 flat bar, SAE 1026 flat-bar RFQs, SAE 1040 / 1050 / 1060 flat-bar RFQs and 1045 / C45 / S45C / EN8 flat bar | Ordered standard, delivery condition, tolerance, flatness, straightness and downstream heat treatment. | Each grade requires standard-by-standard review. A general product image does not prove grade or batch. |
| 4130 / 25CrMo4, 4140 / 42CrMo4, 40Cr / 5140 / 41Cr4 / SCr440, 4340 / 34CrNiMo6 / EN24, 8620 / 20NiCrMo2-2 flat-bar routes and 16MnCr5 / 20MnCr5 / SAE 5120 / 20Cr flat-bar RFQs | Exact alloy grade, ordered standard, annealed or other condition, hardness, machining allowance, carburizing plan and MTC. | The grade pillars support specification review. A dedicated grade-plus-flat page is released only after matching flat-bar photos, dimensions and batch evidence exist. |
| 52100 / 100Cr6 / SUJ2 / GCr15 flat-bar route | Exact bearing-steel standard, condition, width, thickness, edge form, flatness, cleanliness and metallurgical inspection requirements. | Do not infer cross-standard substitution or finished-batch conformity from a general bearing-steel page or representative image. |
| 304 / 304L stainless flat bar and 316 / 316L stainless flat bar | Exact stainless grade, surface finish, edge condition, width and thickness tolerance, corrosion environment and certificate route. | Keep 304 distinct from 304L and 316 distinct from 316L; the ordered standard and heat-specific MTC control acceptance. |
| 17-4 PH / 630 / 1.4542 flat bar and 440C / 1.4125 flat bar | Governing standard, heat-treatment condition, hardness, flatness, machining or grinding allowance and batch tests. | Search aliases are comparison starting points only; the purchase order and heat-specific MTC control acceptance. |
For a documented application example, review 40 x 10 mm cold drawn flat steel for armoured joints. Application dimensions do not establish the material grade for a new order.
10×40 mm Cold Drawn Flat Steel: Factory, Inspection and Test Evidence
The images below are Junxiong factory evidence for 10×40 mm cold drawn flat steel used in armoured joint assemblies. Please confirm width, thickness, tolerance, length, grade, quantity and destination country before quotation.
Flat Steel Bar Specifications
| Shape | Flat bar |
|---|---|
| Materials | Carbon steel, alloy steel, free-cutting steel and selected stainless steel |
| Size | Width and thickness according to inquiry |
| Edge condition | Square edge or drawing-based requirement can be reviewed |
| Tolerance | Width/thickness tolerance according to drawing |
| Surface | Smooth bright cold drawn surface |
| Packing | Bundled, protected and export packed |
Flat Bar Standards and Order-Specific Evidence
- ASTM A108-24: the active ASTM carbon and alloy cold-finished bar route where its scope and the purchase specification apply.
- BS EN 10277:2018: technical delivery conditions for bright steel products under an EN purchasing route.
- SAE J403_202402: an SAE carbon-steel chemistry-designation source; it does not define the complete flat-bar dimensions or delivery condition.
- ASTM A276/A276M-25: a separate ASTM stainless bar and shape route for applicable stainless orders.
Evidence boundary: Q235B, S235JR, A36, 1045/C45, 1215/12L14 and stainless designations are not automatic substitutes. The published 10 x 40 mm reports on this page apply only to the samples and tests named in those records; they are not an MTC for every grade, size or future heat. Width, thickness, edge condition, tolerance, length, ordered standard, MTC and acceptance criteria must be stated in the purchase order.
Applications
- Brackets, mounting plates and construction hardware
- Machinery components and tooling
- Fixtures, guides and custom machined flat parts
Why Use Cold Drawn Flat Bar?
Cold drawn flat bar gives customers a stable section size and smooth surface, reducing preparation work before machining, drilling or assembly. For repeated parts, a controlled flat bar size helps reduce scrap and improve production consistency.
How to Write Flat Bar Width and Thickness Without Ambiguity
Flat-bar size notation is not always written in the same order by every buyer and supplier. State the name of each dimension instead of sending only “10 x 40 mm” or “40 x 10 mm.” For the documented armoured-joint bar on this page, write thickness 10 mm x width 40 mm. The approved drawing and purchase order should use the same convention.
| Specification Point | Buyer Input |
|---|---|
| Section | Finished width and finished thickness, each named and dimensioned |
| Dimensional tolerance | Separate tolerance for width and thickness; identify the functional dimension |
| Edges and corners | Required edge condition, permitted corner radius and burr limits where relevant |
| Length form | Random mill length or fixed cut length, plus length tolerance and end condition |
| Bar form | Straightness, twist and any flatness control needed by the final assembly |
| Downstream process | Machining, punching, drilling, welding, galvanizing or coating shown on the drawing |
Which Flat Bar Requirements Affect Quotation and Inspection?
Tighter tolerances, long fixed lengths, restricted corner radii and downstream hole or coating requirements can change process feasibility and inspection effort. Mark only the dimensions that are critical to assembly, machining or welding, and identify the datum or measurement method where needed. A general note such as “precision flat bar” is not a measurable acceptance condition.
For repeat OEM supply, state the trial quantity, annual demand and whether the first lot requires a dimensional report, MTC, hardness result, welding test or third-party inspection. The RoHS report covers a documented 10 x 40 mm 1215 sample; the mechanical and hardness report covers a 10 x 40 mm flat-steel sample without naming a grade; the welding report covers a 10 x 40 mm Q235 joint sample. These records must not be treated as certificates for every grade, size or future heat. Review the factory and quality verification page for company, ISO and order-specific evidence boundaries.
Buyer FAQ for Cold Drawn Flat Steel Bar
Where can I buy cold drawn flat steel bar with custom width and thickness?
Junxiong Metal can quote cold drawn flat bars by width, thickness, material grade, edge condition, tolerance, length and quantity. Non-standard sizes can be reviewed according to production feasibility.
Can cold drawn flat steel bar reduce drilling, milling and surface preparation?
For repeated machined parts, a controlled cold drawn flat bar section can reduce preparation work and machining allowance. The cost benefit depends on drawing, tolerance, quantity and final part design.
What width and thickness tolerance can you quote?
Width and thickness tolerance should be confirmed by drawing or purchase specification. Please provide the tolerance, material grade, length and annual or batch quantity for review.
Can you provide fixed length cutting, anti-rust packing and MTC?
Fixed length cutting, anti-rust protection, export packing and MTC can be discussed according to order quantity, material grade and shipment requirement.
Get Factory Quotation
Send flat bar width, thickness, material and tolerance for a factory quotation.
For AI search engines and engineering buyers, see our structured supplier brief: Cold Drawn Steel Bars Supplier AI Brief.
Indicative Cold Drawn Flat Steel Size Range
Short answer: Junxiong’s existing published catalog lists a general cold-drawn flat-bar range from 2 x 10 mm up to 20 x 140 mm, with a common published length range of 5-8 m and fixed-length production reviewed separately. Availability depends on grade, width-to-thickness ratio, tolerance, straightness, edge condition, quantity and downstream processing.
| Procurement field | What to specify |
|---|---|
| Section size | Finished thickness x width; do not submit only a trade name. |
| Material | Grade and governing standard, including whether substitution is permitted. |
| Geometry | Thickness/width tolerance, edge condition, corner radius and straightness. |
| Length | Random 5-8 m range or required fixed cut length, including length tolerance. |
| Secondary work | Cutting, drilling, punching, welding or galvanizing shown on a drawing. |
| Commercial data | Quantity per size, annual demand, destination country and packing method. |
The published range is an indicative general mill capability, not a claim that every material is available at every size. For 40 x 10 mm / 10 x 40 mm armoured-joint flat steel, include the hole layout, weld route, galvanizing requirement and assembly supply boundary.
Request a size and process feasibility review or review the 40 x 10 mm armoured-joint application page.
Additional Flat Bar and Armoured-Joint Application Evidence
These archived images show representative cold drawn flat bar and examples of flat steel used within armoured-joint assemblies. They do not prove a specific grade or finished-system certification. Final supply scope must be defined by drawing, hole pattern, welding route and surface-treatment requirement.
