Specialist in Manufacturing Industrial Steel Fasteners

A4-70 Stainless Steel Bolt

Vision alloy is one of the most astonishing manufacturers, suppliers, and stockists of stainless steel products. These products are highly efficient for industrial, commercial, and household uses. A4-70 stainless steel bolts are highly ductile and strong. We manufacture these bolts using high-quality metals and raw materials. These bolts are highly durable and highly tested. We at Vision Alloy manufacture and supply these products by taking all the safety precautions. 

A4-70 stainless steel bolts are made of austenitic steel and high-quality elements. These elements are manufactured by using a high-quality combination that includes 18% chromium, 3% molybdenum, and 8% of nickel. The high quantity of elements like chromium, nickel, and molybdenum provides great ductility and strength to the grade. 

A4-70 stainless steel bolts are commonly used for joining or holding two or more objects or materials together. These stainless steel bolts are very stable in nature. They have excellent malleability and robustness. These bolts support welding, pitting, and annealing. A in A4-70 stainless steel bolts stands for austenitic steel. Austenitic steel is very sturdy and durable. Elements like molybdenum, nickel, and chromium provide high resistance from corrosion, crevice corrosion, and stress cracking. A4-70 stainless steel bolts are capable of taking heat up to 870°C. 

A4-70 also has high tensile and yield strength which is one of the main features of this grade. A4-70 also includes elements like phosphorus, silicon, sulfur, and manganese. 

We at Vision Alloy make sure that the grade is thoroughly tested and certified before getting dispatched. We also use multiple testing methods on grade in order to state the quality of the product. 

A4-70 Stainless Steel Bolt

A4-70 Stainless Steel Bolt Specification :

Product name Stainless Steel A4-70 Bolts
Place of Origin India
Standard ISO 4017, DIN931, GB5783, DIN, ASTM, ANSI, JIS, EN, AS
DIN Standard B.S. DIN933 DIN931 DIN934 DIN912 DIN603 DIN6923
Surface treatment
Passivation /plain
Stainless Steel A4-70 Hex Bolts Size M2 – M100
Stainless Steel A4-70 Hex Bolts Diameter M3-M60
Stainless Steel A4-70 Hex Bolts Length 6mm-500mm
Head Hex, Square, Round, Hex flange, Flat, T-head & Triangular etc
Neck type Hex, Square, Triangular, Oval & Knurled etc
Drive type Phil, Slotted, Hex socket, Torx & square slot etc
Stainless Steel A4-70 Hex Bolts Application Wind tower, Nuclear power, Railway, Automotive industry, Construction, Electronic industry
Dimensions ASME B18.6.3 **Exception: screws 6 inches and shorter are fully threaded.
Drive Style Type I
Stainless Steel A4-70 Hex Bolts Material 18-8 Stainless Steel, stainless steel ss 304/ SS316 A2/A4, SS201, SS303, SS304, SS316, SS316L, SS904L, A2-70; A4-70; A4-80
Thread Requirements ASME B1.1, UNC & UNF, Class 2A (Fastenal will inspect and accept parts with a 1A no-go gauge)
Finish Per ASTM A380/A380M
Finishing Zinc Plated (Yellow, White, Blue, Black), Hop Dip Galvanized (HDG) phosphorization, Black Oxide, Geomet, Dacroment, anodization, Nickel plated, Zinc-Nickel plated, Brass Plated, Tin Plated, Black Plated, Copper Plated, Gold Plated, Salt fog test
Stock Products Stainless steel: All DIN, GB Standard and part ASNI standard stainless steel A4-70 Hex Bolts, A4-70 Hex: ISO7380, DIN7981, DIN7982, DIN916, DIN913, DIN7985, DIN912
Production technology Cold Forged
Manufacturing Process Wire Drawing, Cold Heading, Insert tapping, Heat Treatment, Surface Plating, Inspection, Packing
MOQ 10 pieces
Delivery time Regular product is about 7-15 days, custom product will according to special requirement
Others OEM, ODM, ±0.03MM tolerance
Surface treatment of stainless steel A4-70 Hex Bolts
  • Passivation
  • Polish
  • Anodizing
  • Sand blasting
  • Electroplating (color, blue, white, black zinc, Ni, Cr, tin, copper, silver)
  • Black oxide coating
  • Heat-disposing
  • Hot-dip galvanizing
  • Rust preventive oil
Coatings Black Oxide, Cadmium, Galvanized, Teflon, Xylan, Zinc, Others Upon Request
Tolerance of stainless steel A4-70 Hex Bolts +/-0.01mm to +/-0.05mm
Samples Yes
Production Capacity 2,700,000 pieces per month

Property Class :

For Bolts & Screws: A2-70, A2-80, A4-70, A4-80, F593C, F593D, F593G, F593H

For Nuts: A2-70, A2-80, A4-70, A4-80, F594C, F594D, F594G, F594H, A2-035, A4-040

For SHCS: F837B, F837C, F837E, F837

For Threaded Rods: A2-70, A2-80, A4-70, A4-80, F593C, F593D, F593G, F593H, B8, B8M CL1 & CL2

A4-70 Stainless Steel Bolt Composition :

Chemical Composition
Typical compositional ranges for grade A4-70 Stainless Steel Bolt

Grade C Si Mn P S Cr Mo Ni Cu N
A4-70 Min 16.0 2.0 10.5
ISO Max 0.08 1.00 2.00 0.045 0.03 18.5 3.0 14.0 1.0
A4-70 Min 16.0 2.0 11.5 0.12
ISO² Max 0.03 1.00 2.00 0.045 0.03 18.5 3.0 14.0 1.0 0.22

Mechanical Properties
Typical mechanical properties for grade A4-70 Stainless Steel Bolt

Grade Tensile Strength (MPa) min Yield Strength
0.2% Proof
(MPa) min
(% in 50mm) min
Rockwell B (HR B) max
Brinell (HB) max
A4-70 700 450 40 Not required Not required

Physical Properties
Typical physical properties for annealed grade A4-70 Stainless Steel Bolt

Grade Density
Elastic Modulus (GPa) Mean Co-eff of Thermal Expansion (μm/m/°C) Thermal Conductivity (W/m.K) Specific Heat
0-100 °C (J/kg.K)
Elec Resistivity (nΩ.m)
0-100 °C 0-315 °C 0-538 °C
At 100 °C At 500 °C
A4-70 8000 193
15.9 16.2 17.5
16.3 21.5
500 740
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