Product Overview
Stainless steel hexagonal bars are manufactured for automated CNC machining and precision fastener production. The six-sided profile eliminates primary milling steps when producing hex nuts, bolts, valve components, and hydraulic fittings. Produced via cold drawing or hot rolling, these bars provide controlled dimensional tolerances, predictable machinability, and corrosion resistance across Austenitic, Martensitic, and Precipitation Hardening grades.
Technical Specifications
|
Parameter |
Specification Details |
|
Standard Grades |
304/304L, 316/316L, 303, 410, 420, 17-4PH |
|
Size Range (Across Flats) |
6mm to 80mm (1/4" to 3") |
|
Standard Lengths |
3000mm, 5800mm, 6000mm (Custom lengths available down to 500mm) |
|
Dimensional Tolerance |
ISO h9, h11, k11 (Cold Drawn); K12 (Hot Rolled) |
|
Surface Condition |
Cold Drawn, Centerless Ground, Polished (Ra <= 0.8um), Pickled |
|
Straightness |
Max 0.5mm/1000mm (Laser tested) |
|
Executive Standards |
ASTM A276, ASTM A484, EN 10278, JIS G4303 |
Product Advantages
Strict Tolerances:
Cold-drawing processes maintain consistent across-flat dimensions, minimizing stock removal during Swiss lathe turning and preventing collet slippage.
Controlled Machinability:
Controlled sulfur additions in Grade 303 and uniform carbide distribution in 304/316 reduce chip stringing and extend tool life during high-speed production runs.
Corrosion Resistance:
Austenitic grades (304/316) perform reliably in chemical, marine, and food-processing environments without premature pitting or degradation.
In-House Mill Capability:
Backed by 12 multi-roll drawing benches and continuous annealing furnaces, ensuring uniform grain structure and mechanical properties from batch to batch.
Applications
Fasteners: CNC-machined hex nuts, heavy hex bolts, socket cap screws, and threaded standoffs.
Fluid Power & Valves: Valve stems, hydraulic fittings, adapters, and pump shafts requiring pressure containment.
Automotive & Aerospace: Precision fuel system components, fasteners, and structural linkage pins.
Medical Instruments: Surgical tool handles and non-implantable device fittings (Grade 316/316L).
Customization & Processing
Cutting Services: High-speed band saws capable of precision cut-to-length services with burr-free ends.
Surface Processing: Centerless grinding for tight diameter requirements and mechanical polishing for sanitary applications.
Heat Treatment: Solution annealing, quenching, and tempering available to meet specific hardness and tensile strength requirements (e.g., Condition A or H1025 for 17-4PH).
Packaging Customization: Bundles wrapped in heavy-duty woven plastic with wooden crating for export protection.
Quality Control & Inspection
Every production lot undergoes verification prior to release. Testing facilities and protocols include:
Spectrochemical Analysis: Direct-reading optical emission spectrometer (OES) verifying chemical composition against ASTM/EN limits.
Mechanical Testing: Tensile strength, yield strength, elongation, and Brinell/Rockwell hardness testing.
Dimensional Inspection: 100% digital micrometer and laser caliper checks across flats and length.
Non-Destructive Testing (NDT): Eddy current testing for surface and subsurface defect detection on critical-application bars.
Documentation: EN 10204 3.1 Mill Test Reports (MTRs) provided with every shipment, ensuring material traceability.
Packaging & Shipping
Standard Packaging:
Bundles secured with steel strapping, wrapped in waterproof woven fabric, and bundled up to 2 metric tons.
Export Protection:
Anti-rust oil coating applied to bare metal surfaces prior to wrapping; wooden pallet or box reinforcement for sea freight.
Logistics:
Direct loading from our manufacturing facility to containers or flatbed trucks, servicing major ports globally.
FAQ
Q: What is the minimum order quantity (MOQ) for standard versus custom-grade hex bars?
A: For standard sizes in Grades 304 and 316, the MOQ is 1 metric ton per size. For custom grades or non-standard across-flat dimensions, the MOQ is 3 metric tons or negotiable based on rolling schedules.
Q: Are Mill Test Reports (MTRs) supplied with the shipment?
A: Yes. Every order includes an EN 10204 3.1 MTR detailing chemical composition, mechanical properties, and heat numbers, traceable to the raw material melt.
Q: What is the difference between cold-drawn and hot-rolled hex bars for CNC machining?
A: Cold-drawn bars offer tighter dimensional tolerances (h9/h11), better surface finish, and higher yield strength due to strain hardening, making them suited for automatic screw machines. Hot-rolled bars are used for heavier forging or applications where tighter tolerances are achieved via subsequent machining.
Q: Can you supply custom lengths to fit our automatic feeder systems?
A: Yes. We provide precision cut-to-length bars (tolerance +/- 1mm) tailored to match the feed length requirements of CNC lathe bar loaders.
Q: What is your standard lead time for stock versus production orders?
A: Items available in our finished goods inventory ship within 7 to 10 business days. Production orders for non-stock sizes or specific heat treatments require 25 to 35 business days.
Q: Do you perform eddy current testing on hexagonal bars?
A: Yes. Eddy current testing can be integrated into the finishing line upon request to detect surface seams, cracks, or laps prior to dispatch.
Request a Quote
Provide your specifications below to receive a formal quotation within 24 business hours:
• Steel Grade (e.g., 304, 316L, 17-4PH)
• Size (Across Flats in mm or inches)
• Quantity (Metric Tons or Pieces)
• Length Requirements & Tolerance
• Destination Port / Delivery Address
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