Premium A2 (304) and A4 (316) stainless steel hex screws, fully threaded (DIN 933 / ISO 4017). Available in strength classes A2-70, A4-70, A4-80, with metric coarse threads (M3–M56) and select UNC/UNF on request. Mill Test Certificates (MTC), strict dimensional tolerances, and fast dispatch from ready stock.
DIN 933
Stainless Steel Hex Screw
Trusted SS Hex Screw for demanding applications.
Key Specifications
Standards
DIN 933 (full thread), DIN 931 (partial thread); ISO 4017/4014 equivalents; ASME B18.2.3.1M (metric)
Grades (Material)
A2 (304), A4 (316)
Strength Classes
A2-70, A4-70, A4-80
Threads
Metric coarse (default). Fine/UNC/UNF available on request
Sizes
M3–M56 (others on request)
Lengths
10 mm – 300 mm (range varies by size)
Head
Hexagon, external; washer face per standard
Marking
Grade/class & manufacturer ID as applicable
Certificates
MTC 3.1 / chemical composition & mechanicals available
Compliance
RoHS/REACH; generally non-magnetic in solution-annealed state (slight magnetism possible after cold-work)
Choosing the Right Stainless Steel Hex Screw
1) Environment & corrosion
- Indoors/general outdoor → A2 (304)
- Marine/chemical/chloride exposure → A4 (316)
2) Joint type
- Clamp joints (full nut engagement) → Full thread (DIN 933 / ISO 4017)
- Shear/bending with unthreaded shear plane → Partial thread (DIN 931 / ISO 4014)
3) Strength
- General purpose → A2-70 / A4-70
- Higher clamp load or critical joints → A4-80
4) Thread form
- Default metric coarse (better galling resistance)
- Metric fine/UNC/UNF → when finer adjustment or compatibility with mating parts is required
5) Pairing hardware
- Use matching grade nuts (e.g., A4-80 with A4-80/A4-70 nut as per design) and washers (A2/A4)
- Consider spring/lock washers or prevailing-torque nuts where vibration is present
Mechanical Properties (Guide)
A2-70 / A4-70: minimum tensile strength 700 MPa; typical proof strength 450 MPa.
A4-80: minimum tensile strength 800 MPa; typical proof strength 600 MPa.
Select A4 (316) or A4-80 for marine, chemical, and chloride-rich environments where pitting resistance and/or higher strength are needed.
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What We Do
From a vast manufacturing facility situated in GIDC Wadhwan, Gujarat to strategic
sales offices in Mumbai and Chennai, we design, produce, and deliver a wide array of stainless steel
fasteners, hex bolts, machine screws, socket screws, washers, nuts, self‑tapping screws, threaded rods,
anchor fasteners, and specialty material products, engineered for demanding sectors like petrochemicals,
pharmaceuticals, automotive, and construction.
Our Legacy & Mission
Founded on a vision of precision and service, we have consistently expanded our
capabilities to meet evolving industrial needs. Our commitment to "We Deliver Quality" reflects in the
long-term relationships we build with clients across India and abroad.
Frequently Asked Questions
What’s the difference between DIN 934 and ISO 4032?
DIN 934 and ISO 4032 are both standards for standard hex nuts.
For most common sizes (M5–M20), dimensions are very similar and generally interchangeable in typical applications.
ISO 4032 is the modern international standard, while DIN 934 is the older German standard that many people still use in practice.
How do I choose between A2 and A4 stainless steel hex nuts?
A2 (304) → For indoor, general outdoor, and mildly corrosive environments.
A4 (316) → For marine, coastal, chemical, or chloride-rich environments where corrosion resistance must be higher.
If you’re near the sea, using chemicals, or see pitting / rust in A2, switch to A4.
Which nut grade should I use with my bolt?
Always match or exceed the bolt’s property class: With A2-70 / A4-70 bolts → use A2-70 or A4-70 nuts (same family & environment).
With A4-80 bolts → use A4-80 nuts (or as specified by the design).
Rule of thumb: Nut grade ≥ bolt grade in the same material family.
What’s the difference between a standard hex nut and a thin (jam) nut?
Standard hex nut (ISO 4032 / DIN 934) Full height, designed to take the full load of the joint.
Thin / jam nut (ISO 4035 / DIN 439)
Lower height, used mainly as a lock nut against a standard nut or where space is limited.
Not recommended as the only nut in heavily loaded structural joints.
Will stainless steel hex nuts be magnetic?
A2 / A4 stainless is nominally non-magnetic, but:
Due to cold working (thread rolling, forming) and manufacturing, a slight magnetism is common.
Light magnetism is normal and does not necessarily mean the material is not stainless.
