Carbon Steel · 304 & 316L Stainless · Alloy Steel | Across-Flats Dimensions
Source solid hexagonal steel bars for your fastener production and machining projects. Send your steel grade, across-flats size, length, quantity and finish for a supply quotation.
Review bar specifications ↓
Choose the steel family in your purchase specification. Grades, hexagonal sizes and delivered conditions are confirmed against your requirements.
Select SAE 1018, 1045 or another specified carbon grade for your hexagon bar stock. Confirm material chemistry, AF size and cold-finished or hot-rolled condition in the enquiry.
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Choose 304 or 316L for stainless hexagonal bar parts. Include the required ASTM or EN standard, finish and inspection documents with your order.
Explore Stainless Steel Bar↗
Request alloy steel grades for engineering and machined components, with the hexagonal section and heat-treatment condition confirmed against the ordered size.
Explore Alloy Steel Bar↗Send your combined hex bar list with grade, across-flats dimension, length, tonnage and shipping destination.
The key purchasing measurement is across flats (AF). Include section dimensions, grade and surface condition in the RFQ.
| Cross-section | Solid regular hexagonal bar — six flat faces |
| Ordering dimension | Across Flats (AF), measured between opposite parallel faces |
| Across Corners (AC) | Approx. 1.1547 × AF for a regular hexagonal section |
| Grade selection | Carbon, stainless or alloy; material grade confirmed per enquiry |
| Cold-finished carbon / alloy bar | ASTM A108-24, when specified and applicable |
| Stainless steel hex bar | ASTM A276/A276M-25; EN 10088-3 where specified |
| Age-hardening stainless bar | ASTM A564/A564M-25 where the selected grade and condition require it |
| Bright bar tolerances | EN 10278 or the agreed ASTM dimensional tolerances, as applicable |
| Finished length | Mill length or cut length according to the order |
| Surface condition | Hot-rolled / cold-drawn / bright finish subject to grade and size |
| Inspection documents | Heat analysis, dimensions, mechanical test records and MTC as specified |
| Commercial details | Grade, AF size, length, total quantity, delivery port and certificate scope |
AF measures the distance between opposite parallel faces. This is the size to put on your hex bar purchase list.
| Across Flats (AF) | Across Corners (AC) approx. | Carbon steel theoretical kg/m |
|---|---|---|
| AF 10 mm | 11.55 mm | 0.680 kg/m |
| AF 12 mm | 13.86 mm | 0.979 kg/m |
| AF 16 mm | 18.48 mm | 1.740 kg/m |
| AF 20 mm | 23.09 mm | 2.719 kg/m |
| AF 25 mm | 28.87 mm | 4.249 kg/m |
| AF 30 mm | 34.64 mm | 6.118 kg/m |
| AF 40 mm | 46.19 mm | 10.877 kg/m |
The values illustrate nominal regular hexagon geometry using 7,850 kg/m³. They are calculation examples, with available sizes and tolerance confirmed on enquiry.
Measure between opposite flat faces for AF. The corner-to-corner dimension is approximately 1.1547 × AF for a regular hexagon.
Finish and tolerance depend on grade, section size and mill process. Specify the delivered condition required by your components.
Mill-finish solid hexagonal sections for fabrication or further processing, subject to grade and production availability.
Defined AF tolerance and straightness for repeat cutting and machining operations. Use the agreed cold-finished bar standard.
Surface finish and dimensional class agreed against the application, material grade and order tolerance requirements.
Six flat faces make hex stock practical for parts that need wrench engagement, controlled orientation or a six-sided starting profile.
Cut hex bar blanks for threaded nuts and fastener-related machined parts.
Steel bar for threaded connectors and wrench-flat couplings.
Hexagonal bar stock for machined hydraulic fittings and industrial adapters.
Machining blanks for components with a finished hexagonal exterior.
Material for specified hex fittings used in serviceable equipment assemblies.
Short-run steel hex blanks for engineering repairs and spare parts.
Hex bar grade and AF size lists for distributors and industrial stockists.
Plan your steel purchasing around actual production scale, company-wide inventory and order-specific material requirements.
Our actual annual steel production across product categories supports industrial procurement and scheduled purchases.
Manufacturing ↗Our company-wide inventory supports supply planning. Your specific hex bar grade, AF size and volume are confirmed by enquiry.
Steel Inventory ↗Provide grade, AF tolerance, straightness and MTC requirements at quotation stage.
Quality Control ↗Combine material grade, bar sizes, shipment quantity and destination in one RFQ.
Use across-flats dimension and bar length to estimate theoretical weight. Choose the nominal density for the material family on your enquiry.
Regular hexagon theoretical area: √3/2 × AF². Calculated shipment mass follows nominal dimensions and reference density.
Work with BAOSTEEL METAL for materials sourced by specified grade, AF size and delivered condition. Our manufacturing business has an actual annual output of 8 million metric tons of steel across product lines.
Send your grade and across-flats schedule. We will confirm current hex bar stock or production arrangements based on the requested sizes, surface conditions and order quantity.
State your AF size tolerance, bar straightness, surface condition and grade documentation requirements with your RFQ. These parameters establish the material acceptance criteria for your buying team.
Include finished cut lengths or drawings with your hex bar order. We will confirm processing availability and tolerances alongside the bar supply quotation.
Your packing instructions, section size, total bundle weight and destination guide the export shipment arrangement. We can confirm the proposed packing and delivery terms with your order quotation.
Review material-specific product pages for chemistry, heat treatment and other procurement details.
Use these details to prepare your material list and confirm a practical factory quotation.
Use the Across Flats (AF) measurement, material grade, bar length, quantity, surface finish and agreed tolerance class.
AF is measured between opposing parallel faces. Across Corners (AC) is approximately 1.1547 × AF for a regular hexagonal cross-section.
For AF in millimetres, area equals √3/2 × AF² square millimetres. Multiply area by length and nominal material density to estimate mass. Use the calculator above for your quantity.
Submit the stainless grade, AF dimension, length and finish. Our team will confirm current hexagonal bar supply arrangements and test documents for that order.
Include finished length, tolerance, cutting drawings and MTC requirements in the RFQ. The quotation will specify the available processing and documentation scope.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.
