Stainless Steel Hex Bar
The stainless steel hexagonal bar is a long strip of stainless steel with a regular hexagonal cross-section. It is a common and important specific form of stainless steel bar, mainly used as standardized mechanical structural components or processing blanks.
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Product Introduction

Stainless Steel Hex Bar (Hexagonal Bar) is a specialized bar stock with six equal sides, designed primarily for machining into fasteners, fittings, and precision mechanical components. The hexagonal shape provides excellent gripping surfaces for wrenches and machining fixtures while offering superior material efficiency compared to round bar for certain applications. Available in all standard stainless steel grades including 303, 304/304L, 316/316L, 410, 416, and duplex alloys, hex bars combine corrosion resistance with precise geometry for manufacturing high-quality components across industries from automotive to aerospace.

Manufactured through hot extrusion, cold drawing, or centerless grinding processes, stainless steel hex bars are characterized by precise dimensional tolerances, consistent corner radii, and excellent surface finishes. The six-flat configuration allows for efficient material utilization in fastener production and provides natural orientation features for automated machining operations. From socket head cap screws and nuts to valve stems and specialized fittings, hex bars deliver reliable performance while maintaining the mechanical properties and corrosion resistance required for demanding applications.

Product parameters


Item / Parameter

Specification for Stainless Steel Hex Bar

Notes / Significance

Key Feature

The Precision Fastening and Machining Material. Hexagonal cross-section provides excellent wrenching surfaces and material efficiency for fastener and fitting production.

The preferred material form for machining hex-shaped components and fasteners across industries.

Available Grades

Free-Machining: 303, 416, 430F
Austenitic: 304/304L, 316/316L, 321, 347
Martensitic: 410, 420, 440C
Ferritic: 430, 439
Duplex: 2205, 2507
Precipitation Hardening: 17-4PH

Grade selection based on corrosion resistance, machinability, and strength requirements.

Standard Dimensions

Across Flats (AF): 3mm - 100mm
Common Sizes: 6mm, 8mm, 10mm, 12mm, 14mm, 17mm, 19mm, 22mm, 24mm, 27mm, 30mm
Length: Standard 3-6m, custom lengths available
Corner Radius: Typically 0.1-0.3×AF

Standard sizes correspond to common wrench and fastener dimensions.

Dimensional Tolerances

Across Flats: h9 to h11 tolerances
Size 6-30mm: Typically ±0.1mm to ±0.2mm
Size 30-100mm: Typically ±0.2mm to ±0.4mm
Straightness: 1-2mm per meter
Corner Sharpness: Controlled radius or chamfer
Length: ±3mm to ±10mm

Precision tolerances critical for machining and fastener applications.

Manufacturing Processes

Hot Extrusion: Heated billets forced through hexagonal die
Cold Drawing: Hot rolled bars cold drawn to precise dimensions
Centerless Ground: Precision ground for tight tolerances
Turned/Polished: Improved surface finish for critical applications

Different processes for different quality and precision requirements.

Surface Finishes

Hot Finished: Black, scaled surface (requires pickling)
Cold Drawn: Bright, smooth finish (most common)
Centerless Ground: Precision ground, superior surface
Polished: Mirror or satin finish for decorative applications
Peeled/Turned: Improved surface for precision machining

Cold drawn finish most common for machining applications.

Mechanical Properties

Varies by grade and condition:
303 Annealed: Rm ≥515 MPa, Hardness ≤201 HB
304 Annealed: Rm ≥515 MPa, Hardness ≤201 HB
316 Annealed: Rm ≥515 MPa, Hardness ≤217 HB
410 Annealed: Rm ≥480 MPa, Hardness ≤217 HB
416 Annealed: Rm ≥480 MPa, Hardness ≤217 HB

Properties consistent with equivalent round bar grades.

Corner Configurations

Sharp Corners: Minimal radius for maximum material
Rounded Corners: Controlled radius for stress reduction
Chamfered Corners: Angled edges for easier handling
Full Rounded: All corners radiused for specific applications

Corner treatment affects machining characteristics and part performance.

Machinability Ratings

303: 78% of B1112 steel (excellent)
416: 85% of B1112 steel (excellent)
304: 45% of B1112 steel (fair)
316: 60% of B1112 steel (good)
430: 65% of B1112 steel (good)

Free-machining grades preferred for high-volume production.

Key Standards

ASTM A276: Stainless Steel Bars (includes hexagons)
ASTM A479: Bars for Pressure Vessels
ASTM A484: General Requirements
EN 10088-3: Stainless Steel Bars
JIS G4303: Stainless Steel Bars
ASME SA479: Code Construction
ISO 683-13: Stainless steels

Comprehensive standardization for quality assurance.

Common Applications

• Fastener Manufacturing: Bolts, screws, nuts, socket head products
• Valve Components: Valve stems, fittings, connector parts
• Fluid System Parts: Fittings, adapters, coupling components
• Machinery Components: Shafts, spindles, actuator parts
• Automotive: Engine components, suspension parts, fittings
• Aerospace: Aircraft fasteners, fitting components, structural parts
• Medical: Surgical instrument components, device parts

Primarily used for machining into precision hexagonal components.

Surface selection

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Packaging and transportation

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FACTORY SHOW

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FAQ

Q:What about your price? 
A:Our price is very competitive because we are a factory. Feel free to contact us if you are interested in our products. 

Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.

Q:What product information do I need to provide?
A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase. 

Q:Does the product have quality inspection before loading? 
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we
accept the third party inspection absolutely. 

Q:How about the delivery time? 
A:Within 3-15 days after we confirm you requirement. 

Q:What is your terms of payment ?
A:T/T, L/C at sight, Cash, Western Union are all accepted if you have other payment,please contact me. 

Q: Do you provide samples? 
A:Yes,we could offer the sample for you to test but please pay freight fee.

Q:How do we trust your company? 
A:We are a specialized company focusing on global steel trading and supply chain services. Our mission is to provide high-quality, multi-specification, and one-stop steel products and solutions to customers worldwide.

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