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Wuxi Tianchen Cold-Drawn Steel Co., Ltd.
Standard Steel Bars

Standard Steel Bars — Round, Hexagonal, Square, Flat Bars & Wire Rod

Precision cold-drawn process with high dimensional accuracy and bright smooth surface. Widely used in new energy vehicles, intelligent equipment, robotics and precision manufacturing.
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Options for Standard Steel Bars

Round Steel Bar

Round Steel Bar

Precision cold-drawn round steel, high precision grade, bright smooth surface. For precision machinery, automotive parts and hardware tools.


Hexagonal Steel Bar

Hexagonal Steel Bar

Cold-drawn hexagonal steel, high dimensional accuracy, excellent surface quality. Widely used for bolts, nuts and precision components.


Square Steel Bar

Square Steel Bar

Cold-drawn square steel, high dimensional accuracy, uniform structure. Suitable for deep processing and precision part manufacturing.


Flat Steel Bar

Flat Steel Bar

Cold-drawn flat steel, bright flat surface, precise stable dimensions. Widely used in tools, dies and mechanical structures.


Wire Rod

Wire Rod

Cold-drawn wire rod, smooth surface, dense structure. Suitable for wire drawing, fasteners and spring manufacturing.


Features & Benefits of Standard Steel Bars

Superior Dimensional Accuracy

Superior Dimensional Accuracy

· Dimensional tolerances up to ±0.03mm, precision products reach ±0.02mm

· Consistent dimensions throughout the entire length, reducing machining allowance

· Meets high-precision manufacturing needs, lowering customer processing costs


Excellent Surface Quality

Excellent Surface Quality

· Cold-drawn process creates a bright, smooth surface

· No scale, no defects

· Eliminates secondary processing, ready for immediate use

· Surface roughness Ra ≤ 1.6μm


Enhanced Mechanical Strength

Enhanced Mechanical Strength

· Work hardening increases tensile strength by 20%-30%

· Improves yield strength while maintaining good ductility

· Superior fatigue life, suitable for high-stress applications

· Ideal for critical components subjected to repeated loads


Multiple Shapes & Specifications

Multiple Shapes & Specifications

· Round Bar: Diameter 3mm - 200mm

· Hexagonal Bar: Across flats 6mm - 80mm

· Square Bar: Side length 3mm - 150mm

· Flat Bar: Thickness 2mm - 50mm, Width 10mm - 200mm

· Wire Rod: Diameter 5mm - 20mm

· Sufficient stock of standard materials, fast custom response for non-standard specs


Excellent Machinability

Excellent Machinability

· Uniform internal structure, low cutting resistance

· Reduced tool wear, extended tool life

· High-quality machined surface finish

· Improved processing efficiency, reduced production costs


Consistent Material Quality

Consistent Material Quality

· Strict raw material control and production process monitoring

· Each batch traceable, material certificates provided

· Stable chemical composition and mechanical properties

· Meets international standards (ASTM, DIN, JIS, GB)


Wide Application Range

Wide Application Range

· Automotive Parts: Gears, shafts, bolts

· Precision Machinery: Machine tool guide rails, lead screws

· Electronics: Motor shafts, connectors

· Hydraulics & Pneumatics: Piston rods, valves

· Hardware Tools: Electric Tools, fasteners

· Power Equipment:Stainless steel busbars, stainless steel grounding rods

· Green Building:  Stainless steel profiles, structural components

· Marine: Cold-drawn stainless steel shafts, fasteners


Reliable Supply Chain

Reliable Supply Chain

· 28+ years of industry experience, reliable reputation

· Sufficient stock, fast delivery (7-15 days)

· Supports small trial orders

· Professional after-sales service and technical support

· Export quality, trusted worldwide



Specification of Standard Steel Bars

Main Parameters of Standard-Shaped Steel

ShapeSpecifications (mm)Roughness Ra (µm)Length (m)
Square Steel4×4 – 90×90≤1.62.5–8.0, Customizable
Flat Steel3×8 – 10×120≤1.62.5–8.0, Customizable
Hexagon SteelS6 – S75≤1.62.5–8.0, Customizable
RemarkCustomizable Cold-Drawn Profiles / Shaped Steel Wire


Product Accuracy Grades and Tolerances

Size (mm)h9h10h11
>3-60, -0.0300, -0.0480, -0.075
>6-100, -0.0360, -0.0580, -0.090
>10-180, -0.0430, -0.0700, -0.110
>18-300, -0.0520, -0.0840, -0.130
>30-500, -0.0620, -0.1000, -0.160
>50-800, -0.0740, -0.1200, -0.190


FAQs of Standard Steel Bars

What dimensional tolerances can you achieve?

Our cold-drawn steel products can achieve dimensional tolerances of ±0.03mm, with precision products reaching ±0.02mm — well above industry standards.

What material grades do you offer?

We offer a wide range of material grades:

· Carbon steel: 1018, 1045 etc.

· Alloy steel: 4140, 42CrMo, 8620, etc.

· Stainless steel: 304, 316, 303, etc.

· Free-cutting steel:1215、12L14 etc.

· Custom materials are also available upon request.


What is your minimum order quantity (MOQ)?

Our MOQ for standard specifications is 2 ton. Custom products vary by specification. We also support small trial orders for quality verification.


Can you provide material certificates and test reports?

Yes, we provide complete material documentation including:

· Mill Test Certificates

· Chemical composition reports

· Mechanical property test reports

· Dimensional inspection reports

All products are traceable and support third-party inspection.


What surface finishes are available?

Our cold-drawn steel features a bright, smooth surface ready for immediate use. Upon request, we also provide:

· Polished finish

· Ground finish

· Passivation (for stainless steel)


What are your packaging and shipping methods?

Standard packaging: Anti-rust paper, waterproof packaging, secured on wooden pallets or in wooden crates.

Shipping: By sea, air, or land. Supports FOB, CIF, EXW, etc.
Lead time: 7-15 days for standard products, 15-30 days for custom products.


What industries do your products serve?

Our cold-drawn steel is widely used in:

· Automotive parts manufacturing

· Precision machinery and machine tools

· Electronics and electrical equipment

· Hydraulic and pneumatic components

· Aerospace components

· Medical devices

· Hardware tools


How do you ensure product quality?

We implement strict quality control:

· Incoming material inspection

· In-process monitoring at key control points

· 100% or sampling inspection for finished products

· Advanced testing equipment (spectrometer, tensile testing machine, hardness tester, etc.)

· ISO 9001 certified quality management system


Looking for a Quote on Cold-drawn Steel?
Looking for a Quote on Cold-drawn Steel?
Contact us now, and our professional team will assist you promptly!
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