ASTM A240 A240M 304 316 Stainless Steel Bright Round Bars For Fasteners Shafts

• Standard: ASTM A240 / A240M
• Main Composition: Cr 18.00–20.00%, Ni 8.00–12.00%, C ≤0.08%, Mn ≤2.00%, Si ≤1.00%
• Features: General austenitic stainless steel, non-magnetic, good ductility, easy cutting and forming, excellent atmospheric and fresh water corrosion resistance.

• Standard: ASTM A240 / A240M
• Main Composition: Cr 16.00–18.00%, Ni 10.00–14.00%, Mo 2.00–3.00%, C ≤0.08%
• Features: Added molybdenum element, greatly improved chloride resistance, salt spray and seawater corrosion performance, better than 304; suitable for humid, coastal and chemical mild corrosive environment.

1. Surface Finish

   Bright polished surface, mirror bright finish, no oxide scale, no crack, no rust spot, uniform luster, clean and burr-free, easy for subsequent polishing, threading and machining.

2. Dimensional Tolerance

   Strictly follow ASTM A240/A240M tolerance standard; roundness straightness high precision; diameter tolerance ±0.02mm~±0.05mm; straightness ≤1.0mm/m, no bending, convenient for automatic lathe processing.

3. Mechanical Performance

• Tensile Strength: ≥515 MPa
• Yield Strength: ≥205 MPa
• Elongation: ≥40%
• Hardness: HB ≤201 / HRB ≤92
  High strength and toughness, not easy to deform, fracture or wear under long-term load.

4. Machinability & Weldability

   Excellent cutting, turning, drilling, tapping performance; good weldability, no crack after welding; easy to process into all kinds of fasteners, shafts, pins and mechanical structural parts.

5. Corrosion & Temperature Resistance

• Good anti-rust, anti-oxidation performance in normal atmospheric and indoor environment
• 316 grade resists salt spray, seawater, weak acid and alkali corrosion
• Stable performance under normal and medium high temperature working conditions, not easy to soften and deform

• Type: Solid Bright Round Bar / Stainless Steel Round Rod
• Diameter: 2mm – 200mm customizable
• Length: 1000mm, 2000mm, 6000mm fixed length or custom cut
• Process: Cold drawn bright, centerless grinding, precision straightening
• Custom service: Cutting, chamfering, threading, polishing as required

• Fully comply with ASTM A240 / A240M international standard
• Strict raw material inspection, chemical composition analysis, mechanical property test, surface and dimension full inspection
• Support third-party testing, provide mill test certificate (MTC), inspection report
• Non-destructive flaw detection to ensure no internal crack and impurity

Specially ideal for manufacturing:

• Fasteners: Bolt, nut, screw, stud, rivet
• Mechanical transmission parts: Shaft, pin, spindle, gear shaft
• Machinery equipment structural parts, valve parts, pump shaft
• Automotive accessories, engineering machinery fittings
• Coastal equipment, environmental protection equipment, food machinery parts
• Custom precision machined components

✅ ASTM A240/A240M standard compliant

✅ 304 / 316 two common grades for choice

✅ Bright mirror surface, high precision size

✅ Good machinability for fastener and shaft making

✅ High corrosion resistance, long service life

✅ Factory price, full stock, custom cutting available