Premium A2 (304) and A4 (316) stainless steel hex nuts. Available in metric coarse threads and select UNC/BSW on request. Mill Test Certificates (MTC), strict dimensional tolerances, and fast dispatch from ready stock.
DIN 934
Stainless Steel Hex Nut
TRSUTED SS HEX NUT FOR DEMANDING APPLICATION
Key Specifications
Standards
DIN 934; ANSI B18.2.4.1M, BS 1083
Grades (Material)
A2 (304), A4 (316)
Strength Classes
-
Threads
Metric coarse (default). Fine/UNC/BSW available on request
Sizes
M1.6 to M 70, 3/16" to 2.1/2" (others on request)
Lengths
-
Head
-
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 Nut
Choosing the right hex nut:
- Environment & corrosion
- Indoors / general outdoor → Use A2 (304) hex nuts
- Marine / chemical / chloride exposure → Use A4 (316) hex nuts
- Matched to bolt grade & strength
- General purpose joints (standard clamp load)
- With A2-70 / A4-70 bolts → Use A2-70 or A4-70 nuts (same or higher class than bolt)
- Higher clamp load / critical joints
- With A4-80 bolts → Use A4-80 nuts (or as per design / standard)
- Rule of thumb: Nut property class ≥ bolt property class (within the same material family)
- Nut type (height & shape)
- Standard hex nut (ISO 4032 / DIN 934)
- For most structural and general-purpose joints
- Thin / jam nut (ISO 4035 / DIN 439)
- For locking against another nut or space-restricted areas
- Not recommended as the only nut in highly loaded structural joints
- Flange hex nut (ISO 4161 / DIN 6923)
- Built-in washer face to spread load and improve bearing on softer material.
- Cap / acorn nut
- For safety, aesthetics, or thread protection, not for high-strength structural clamping unless specified
- Locking / anti-loosening requirements
- Vibration present (motors, machinery, vehicles, etc.) → consider:
- All-metal prevailing torque nuts
- Nyloc / polymer insert nuts (temperature & chemical limits apply)
- Serrated flange nuts (where surface damage is acceptable)
- Combine with spring washers, wedge-lock washers, or thread locking adhesive if design requires.
- Material compatibility
- Use A2 nuts with A2 bolts, A4 nuts with A4 bolts as far as possible.
- Avoid mixing stainless nuts with carbon steel bolts in corrosive environments (risk of galvanic corrosion and unpredictable failure modes).
Mechanical Properties (Guide)
Note: Nuts are rated by proof load rather than tensile strength like bolts, but they are designed to safely clamp bolts of the same property class. • A2-70 / A4-70 hex nuts
o Intended to be used with A2-70 / A4-70 bolts (700 MPa class)
o Designed proof load is such that the nut can sustain the proof load of the matching bolt without thread stripping or deformation.
- A4-80 hex nuts
o Intended to be used with A4-80 bolts (800 MPa class)
o Higher proof load capacity for higher clamp forces and more critical joints.
Simplified selection rule
- For general stainless joints → A2-70 or A4-70 nut (match the environment: A2 for normal, A4 for marine/chemical).
- For high-strength stainless joints or where extra safety margin is required → A4-80 nut with A4-80 bolt.
- For marine, chemical, chloride-rich environments → A4 -70
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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.
"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."
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.
