DIN ES ISO specifies the mechanical properties of bolts, screws and nuts made of austenitic (amongst others) stainless steels, when tested over an ambient temperature range of 15ºC to 25ºC.
Midland Bright Steels supplies a range of material that enable fastener manufacturers and others to produce products that meet or exceed the properties required in the above standard. Material to meet the properties of A is one element of our product range.https://midlandbrightsteels.co.uk/?page_id=&preview=true
The designation A derives from “A” meaning the material is a cold worked austenitic stainless, divided into 5 grades () according to material characteristics (see Annex B of DIN ES ISO for full description of each grade). The “70” denotes the minimum tensile strength to be met by the material (actually the bolt, screw or nut after manufacture).
Therefore, A is an austenitic, acid proof stainless grade (usually material – or L) which has been cold worked to provide a minimum tensile strength of N/mm² (MPa).
We stock round bar from 10 mm to 60 mm diameter, and hexagons from 10 mm to 37 mm AF.
We can also produce flats and squares not covered by the standard, on request, to reduce machining costs (up to mm (“4”) square and flats to mm x 50 mm (4” x 2”]). Please enquire as to properties required.
Grade is the standard “18/8” stainless; it is the most versatile and most widely used stainless steel. It has excellent forming and welding characteristics. The balanced austenitic structure of Grade enables it to be severely deep drawn without intermediate annealing; Grade also has outstanding welding characteristics.
Grade L, the low carbon version of , does not require post-weld annealing and so is extensively used in heavy gauge components (over about 6 mm). Grade H with its higher carbon content finds application at elevated temperatures. The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.
Good oxidation resistance in temperatures up to ºC. Continuous use of in the ºC range is not recommended if subsequent aqueous corrosion resistance is important. Grade L is more resistant to carbide precipitation and can be heated into the above temperature range. H will become sensitized in the temperature range of ºC; this is not a problem for high temperature applications, but will result in reduced aqueous corrosion resistance.
Grade is excellent in a wide range of atmospheric environments and many corrosive media, although it is subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60ºC. Grade is considered resistant to potable water with up to about mg/L chlorides at ambient temperatures, reducing to about mg/L at 60ºC. The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures. Heat Treatment is by solution annealing – heated to ºC and cooled rapidly. These grades cannot be hardened by thermal treatment. Cold working (normally drawing) procedures enhanced levels of tensile strength. All austenitic stainless steel fasteners are normally non-magnetic in the annealed condition.
It is common for grades to be stocked in “Dual Certified” form. These items have chemical and mechanical properties complying with both and L specifications.
See table below for A material chemical composition (standard chemical compositions for a range of stainless steels is also given for information).
- If the chromium content is below 17%, the minimum nickel content should be 12%
- If the carbon content is a maximum of %, nitrogen may be present to a maximum of %
The mechanical properties of material supplied for conversion into bolts, screws and studs conforms to the requirement of the standard below. For comparison, the “normal” mechanical properties of stainless are given for information.
|Grade||Tensile Strength (MPa) min||Yield Strength|
(% in 4D min)
|Red of Area (% min)||Hardness (HRC max)|
|A||40||Not required||Not required|
Note: the standard allows that, for diameters over /2” ( mm), centre (core) properties may be lower than indicated by test results which are based on values determined at ½ radius.
Typical physical properties of grade stainless steel in the annealed condition.
|Elastic Modulus (GPa)||Mean Co-eff of Thermal Expansion (μm/m/°C)||Thermal Conductivity (W/m.K)||Specific Heat|
|Elec Resistivity (nΩ.m)|
Mechanical properties of corrosion resistance stainless steel fasteners Grade A
Garde A Bolts, Screws & Nut
A Stainless Steel Fastener is recognized by 2 ways, A2 which describe it as being from SS family and 70 which classifies its strength. When we say A it generally means that the bolt / screw is from SS grade and has an ultimate tensile strength as 70 kg or n/mm2.
ISO Grade A
|A||Hex bolts, screws, stud bolts, double ended studs, full thread rods, full threaded studs|
ISO Grade A Series Chemical properties
mass fraction, % (maxima unless stated))
16 to 19
5 to 10
15 to 20
8 to 19
17 to 19
9 to 12
2 to 3
10 to 15
2 to 3
ISO Grade A Series Mechanical properties
TensileStrengthRma min. Mpa
Stress at % permanent strain Rpa min. Mpa
Elongation after fracture Ab min. mm
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DIN ES ISO specifies the mechanical properties of bolts, screws and nuts made of austenitic (amongst others) stainless steels, when tested over an ambient temperature range of 15o C to 25o C.
Prosaic Steel and Alloys, through its Manufacturing, trading and Export division High Tensile Stainless, supplies a range of material that enable fastener manufacturers and others to produce products that meet or exceed the properties required in the above standard. Material to meet the properties of A is one element of our product range.
The designation A derives from "A” meaning the material is a cold worked austenitic stainless, divided into 5 grades () according to material characteristics (see Annex B of DIN ES ISO for full description of each grade). The "70” denotes the minimum tensile strength to be met by the material (actually the bolt, screw or nut after manufacture).
Therefore, A is an austenitic, acid proof stainless grade (usually material - or L) which has been cold worked to provide a minimum tensile strength of N/mm2 (MPa).
Grade is the standard "18/8" stainless; it is the most versatile and most widely used stainless steel, available in a wider range of products, forms and finishes than any other. It has excellent forming and welding characteristics. The balanced austenitic structure of Grade enables it to be severely deep drawn without intermediate annealing, which has made this grade dominant in the manufacture of drawn stainless parts such as sinks, hollow-ware and saucepans. For these applications it is common to use special "DDQ" (Deep Drawing Quality) variants. Grade is readily brake or roll formed into a variety of components for applications in the industrial, architectural, and transportation fields. Grade also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections.
Excellent in a wide range of atmospheric environments and many corrosive media. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to potable water with up to about mg/L chlorides at ambient temperatures, reducing to about mg/L at 60°C.
Solution Treatment (Annealing) - Heat to °C and cool rapidly. These grades cannot be hardened by thermal treatment.
Our company is equipped with modern machineries and is organized in four divisions viz WIRE PREPARATION PLANT, NUT MANUFACTURING DIVISION, BOLTS/SCREWS & MACHINE SCREWS MANUFACTURING DIVISION, SELF TAPPING & WOOD SCREWS MANUFACTURING DIVISION. The Production facilities always pulsate with the activities of more than employees turning out a wide range of fasteners.
Our divisions are equipped with modem facilities for Development, Q.A and Manufacturing of our products. These are manned by qualified personal having technical expertise and all are committed to maintain best quality of our products. Prosaic Steel and Alloys is proud of its diverse range of fasteners like. Nuts, Bolts/Screws, Socket Products, Machine Screws, Washers, Self Tapping Screws, Wood Screws, Studs, Threaded Rods etc.
Following are the types of fasteners offered by us:
Grades and Specifications
Stainless Steel Fasteners
Standard: ASTM / ASME A/SA /
Grade: B 8 (), B 8C (SS ), B 8M (SS ), B 8 T (SS ), A 2, A 4
Alloy Steel Fasteners
Standard: ASTM / ASME A/SA / GR
Grade: B 6, B 7/ B 7M, B 16, 2, 2HM, 2H, GR 6, B 7, B 7M
UNS NO.S , S
M10 TO M, LENGTH UPTO 5 METERS
STUD BOLTS, HEX HEAD BOLTS, SOCKET HEXAGON HEAD SCREW ANCHOR BOLTS, U-BOLTS, J BOLTS, MUSHROOM HEAD SQUARE NECK BOLTS, T- HEAD BOLTS, WING SCREW, EYE BOLT, EYE BOLT, FOUNDATION BOLTS, STRUCTURAL BOLTS.
PLAIN WASHER, PLAIN BIG & SMALL OD WASHER, SPRING LOCK WASHER, SPRING WASHER HEAVY DUTY, TOOTH WASHER, STAR WASHER, TAB WASHER WITH ONE & TWO TAB.
HEXAGON NUTS, HEXAGON COUPLING NUTS, HEXAGON THIN NUT, SQUARE NUT, HEXAGON CASTLE NUTS, SELF LOCKING NUT, HEXAGON DOMED CAP NUTS.
PAN HEAD SLOTTED SCREWS, CHEESE HEAD SLOTTED SCREWS, COUNTERSUNK HEAD SLOTTED SCREWS, COUNTERSUNK RAISED HEAD SLOTTED SCREWS, PAN PHILLIPSE HEAD SCREW, COUNTERSUNK PHILLIPSE RAISED HEAD SCREWS, SLOTTED CHEESE TRIM HEAD MACHINE SCREWS, SOCKET HEAD ALLEN CAP SCREWS, ALLEN COUNTERSUNK SOCKET HEAD CAP SCREWS, SOCKET HEAD SHOULDER SCREWS, SOCKET HEAD CAP SCREW LOW HEAD, HEXAGON SOCKET SET SCREW WITH FLAT POINT, HEXAGON SOCKET SET SCEWS WITH CONE POINT, HEXAGON SOCKET SET SCREW WITH DOG POINT, HEXAGON SOCKET SET SCREWS WITH DOG POINT, HEXAGON SOCKET SET SCREWS WITH CUP POINT, IMPRIAL SOCKET CAP SCREWS.
THREADED ROD, AS PER DRAWING AND CUSTOMERS SPEC.
HOT DIPPED GALVANIZING
Manufacturer Test Certificate as per EN /
A Stainless Steel Hex Bolt, A Stainless Steel Full threaded Hex Bolt, A Hex Bolt, A Stainless Hex Bolt Manufacturer, A Stainless Steel Hex Bolt Supplier, A Stainless Hex Bolt India, A Stainless Hex Bolt, A Hex Bolt, A Stainless Steel Hex Bolt Supplier in India, A Stainless Steel Hex Bolt Exporter from India, A Hex Bolt Manufacturer in India.
We export A Stainless Steel Hex Bolt to Iran, Iraq, Oman, Qatar, Albania, Muscat, Bahrain, Turkey, Egypt, Maldives, Italy, UAE, Bahrain, Indonesia, Australia, Kuwait, Saudi Arabia, South Africa, Germany, UK, Denmark, Canada, USA, Peru, Brazil, Nizeria, Mexico, Venezuela (Latin America), South America, Russia, kazakhstan etc.
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Bolt a2 70
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