SparkX-High Precision Stainless Steel Hex Bar manufacturer in China Meet All Your Customization Needs.
Stainless steel hex bars are usually used for bolts, studs, couplings, and CNC-machined fittings. SparkX supplies many specifications of stainless steel hex bars and sizes cover A/F 3-80mm with 1-6M cut to length. Grades range from 303 (free-machining) and 304/316L to 431/17-4PH and 2205 duplex. We strictly control the across flats to meet ISO 286 h11/h10/h9 and verify straightness ≤ 1.0mm/m, we can limit twist per meter for bar feeder stability.
If you have any needs for stainless steel hex bars, including other stainless steels and special alloys, please contact our sales representative.
More Stainless Steel Hex Bars
If you have any other needs or require customization, please feel free to contact us.
Best choice for high speed machining of hex fasteners, clean chip breakage, good turning consistency, suitable for machining parts.
Common hex bar used for bolts and fittings, 304L supports welding and reduces sensitization during processing.
Marine grade hex bar for corrosion, suitable for high corrosion environments, molybdenum enhances resistance to pitting corrosion in chloride environments.
Stabilized hex bar for high temperature fastener stock, maintains corrosion resistance after welding and heat cycling.
High strength hex bar suitable for bearing fasteners and shafts, has better corrosion resistance and good hardenability than 410.
Precipitation hardening hex bar ideal for high strength bolts and fittings.
A/F Precision & Twist Control of Stainless Steel Hex Bars
Across flats accuracy is a key point for stainless steel hex bars. We keep A/F within h11/h10/h9 and check flat to flat parallelism so sockets seat uniformly. In addition to straightness, we can also adjust the max twist per meter. And small twist makes the bar feeder run more smoothly and the thread quality more stable, the tool dwell time shorter. So this will reduce a lot of repetitive cutting work for you and consistent wrench engagement on finished fasteners.
Why the Process of Flats & Corners Matters
If your stainless steel hex bar needs tight A/F and a clean surface for direct machining, you should choose bright drawn. And if you want to remove roll-over and micro burrs that cause fit-up gaps or paint failure, we suggest you choose milled or peeled. It’s unlike shearing or flame cutting, these processes avoid HAZ and work hardening, so drills and taps cut freely and last longer. We can hold a defined corner condition, such as sharp edges or a controlled radius, to ensure that the nut is fully in place and the knurling die engages evenly. And the short end chamfer helps the automatic feeder and reduces thread start chipping.
Different Grades of Stainless Steel Hex Bars
If you need the best machinability and clean threads on multispindle lathes, you should choose 303. If you want a more corrosion-resistant stainless steel hex bar, you should choose 304/316L(solution annealed and rapidly cooled to avoid sensitization). If you need a high-strength stainless steel hex bar, you should choose 431or 17-4ph, and this can increase tensile strength without sacrificing dimensional stability. For some environments with high chloride content, please choose 2205 duplex. It solution annealed the water quenched to avoid sigma phase embrittlement. Stress relief is available to keep bars from bowing after heavy turning. We record hardness/UTS/elongation on the 3.1 MTC so your PPAP or inspection plan closes cleanly.
Yes. We supply A/F 3–80 mm and can align A/F to your wrench series or nut standards (ISO/ASME). We’ll confirm A/F tolerance, corner radius, and twist so that sockets seat fully and automated assembly runs smoothly.
Price is not only about the grade. For stainless steel hex bars, we look at the following
Grade Group (303 / 304 / 316L / duplex / PH)
Process Route (bright drawn, peeled, centerless ground — ground is always higher)
A/F Range (A/F 30–40 mm costs more per ton than A/F 12 mm)
Tolerance & Twist Requirement (h10 + low twist adds cost)
Length & Cutting Plan (1–6 m mixed lengths are cheaper than 100% short pieces)
Documents & Packing (3.1 only vs 3.1 + PMI + seaworthy bundles)
Standard: EN 10204 3.1 MTC with chemistry & mechanicals, dimensional check (A/F, straightness, twist), surface visual.
Optional: PMI, UT/eddy current, hardness mapping, corner-radius check, and loading photos. Export packing: rust-preventive oil + PE wrap + hex bundles for sea freight.
