Product Overview
Carbon steel hexagonal bars are engineered for high-efficiency CNC machining and automated component fabrication. Produced through precise cold drawing or hot rolling, these bars feature tight across-flat tolerances and uniform mechanical properties, minimizing tool wear and eliminating feed jams in high-speed production lines. Global procurement managers and machine shops source these cold drawn carbon steel hex bars for reliable machinability and predictable performance.
Technical Specifications
|
Parameter |
Specification Details |
|
Standard Grades |
AISI 1018, AISI 1045, AISI 12L14, AISI 4140, Q235, S355J2 |
|
Size Range (Across Flats) |
6mm to 80mm (0.236" to 3.15") |
|
Length Options |
3000mm, 5800mm, 6000mm, or customized cut-to-length |
|
Tolerance Classes |
h11, h9, or customized precision tolerances |
|
Surface Conditions |
Cold drawn, bright finish, centerless ground, or hot-rolled pickled & oiled |
|
Execution Standards |
ASTM A29, EN 10277, JIS G4051, GB/T 699 |
Product Advantages
High Machinability:
Controlled sulfur and phosphorus content in select grades (such as AISI 12L14) ensures smooth chip breaking and extends CNC tool life during high-speed turning.
Dimensional Consistency:
Rigorous cold-drawing processes maintain strict across-flat tolerances, eliminating feeding jams in automatic bar feeders.
Uniform Hardness:
Heat-treated and annealed microstructures prevent localized hard spots, ensuring predictable mechanical behavior during secondary forming.
Clean Surface Integrity:
Free from scale, pits, and decarburization layers on cold-drawn variants, reducing raw material preparation time.
Applications
Fastener Manufacturing: Machining standard and custom hex nuts, bolts, threaded studs, and socket cap screws.
Fluid Power Systems: Producing hydraulic fittings, adapters, valve stems, and connector manifolds.
Automotive Components: Fabricating steering linkages, transmission components, and fastening brackets.
General Engineering: Structural pins, keys, machinery shafts, and hardware components.
Customization & Processing
Cutting Services:
In-house band sawing for exact fixed lengths, minimizing scrap for end-users.
Custom Grades & Sizes:
Special alloy adjustments and non-standard metric/imperial across-flat dimensions available upon mill review.
End Finishing:
Chamfering, deburring, and protective end-painting for transit safety.
In-House Processing Integration:
Utilizing drawing benches, straightening machines, and eddy current defect detectors prior to dispatch.
Quality Control & Inspection
Chemical Composition Verification: Spectrometer analysis conducted on every heat melt to confirm carbon, manganese, and alloy percentages against mill test certificates.
Dimensional Inspection: Micrometer and laser gauge verification of across-flat dimensions, corner radii, and bar straightness (within <= 1.0 mm/m).
Defect Detection: 100% online or offline eddy current testing to detect surface and subsurface micro-cracks.
Mechanical Testing: Tensile strength, yield strength, and elongation tests performed per ASTM/EN standards; Metallographic examination for grain size and decarburization depth.
Packaging & Shipping
Bundling:
Securely bound with heavy-duty steel strapping at regular intervals to prevent shifting during transit.
Protection:
Wrapped in moisture-resistant woven plastic fabric; anti-rust oil applied to bare steel surfaces upon request.
Lifting & Handling:
Equipped with lifting slings for safe overhead crane loading into standard 20ft/40ft ocean containers or open-top trucks.
FAQ
Q: What is the standard MOQ for non-stock hex bar sizes?
A: MOQ typically starts at 3 metric tons per size for custom cold-drawn production runs, depending on the steel grade and raw material availability.
Q: Do you provide EN 10204 3.1 Mill Test Reports?
A: Yes. Every shipment includes a traceable 3.1 certified test report detailing chemical analysis, mechanical test results, and heat numbers.
Q: How do you control bar straightness for high-speed CNC lathe feeding?
A: Bars are processed through multi-roll precision straightening machines, maintaining straightness tolerances of <= 1.0 mm per meter to prevent vibration and spindle damage at high RPMs.
Q: Can you supply leaded free-machining carbon steel grades?
A: Yes, grades such as AISI 12L14 are available subject to regional environmental and regulatory compliance agreements.
Q: What is the standard delivery lead time for regular specifications?
A: In-stock inventory ships within 7 to 10 days. Mill production schedules typically require 25 to 35 days.
Q: Are third-party inspections accepted prior to shipment?
A: Yes. Inspections by SGS, BV, or designated third-party agencies are accommodated at our facility prior to container loading.
Request a Quote
Submit your technical requirements below to receive a formal quotation, including material availability, mill test certificates, and shipping terms.
Required Steel Grade: (e.g., AISI 1018 / 1045 / 4140)
Size (Across Flats & Length):
Quantity (Metric Tons / Pieces):
Surface / Tolerance Requirement:
Target Destination Port:
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