Premium A2 (304) and A4 (316) stainless steel nylock 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 982
Stainless Steel Nylock Nut
TRSUTED SS NYLOCK NUT FOR DEMANDING APPLICATION
Key Specifications
Standards
DIN 982
Grades (Material)
A2 (304), A4 (316)
Strength Classes
-
Threads
Metric coarse (default). Fine/UNC/BSW available on request
Sizes
M 5 to M 24, 1/4" to 1" (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 Nylock Nut
Environment & corrosion
Indoors / general outdoor → A2 (304) Nylock nut DIN 982
Marine / chemical / chloride exposure → A4 (316) Nylock nut DIN 982
Use A2 for standard machinery, structures, and general outdoor use.
Use A4 near the sea, coastal areas, chemical plants, cooling towers, or where pitting corrosion is a risk.
Strength & matching with bolt grade
General purpose joints →
→ With A2-70 / A4-70 bolts → use A2-70 / A4-70 Nylock nuts (DIN 982)
Higher clamp load / critical joints →
→ With A4-80 bolts → use A4-80 Nylock nuts (if specified) or consider all-metal lock nuts for very high duty / high temperature.
Rule of thumb:
Nylock nut grade ≥ bolt grade, and use the same stainless family (A2 with A2, A4 with A4).
Temperature & chemical limits (nylon insert)
Nylock nuts rely on a nylon insert for locking:
Suitable for normal ambient to moderately elevated temperatures.
Avoid high-temperature zones (exhaust, ovens, near furnaces) – nylon softens and loses locking effect.
Avoid chemicals/solvents that attack nylon (strong solvents, some oils/chemicals).
If the joint runs hot or in aggressive chemicals, choose an all-metal lock nut instead of Nylock.
Vibration level & locking performance
Nylock nut DIN 982 is ideal for:
Low to medium vibration applications (general machinery, panels, enclosures, automotive bodywork, equipment).
Joints you may need to open and close a few times, but not very frequently.
For very high vibration / shock (heavy equipment, critical rotating machinery), prefer:
All-metal prevailing torque nuts or
Nylock + additional safety (e.g., spring washer or thread locker) if design permits.
Thread form & compatibility
Default → Metric coarse (e.g., M8×1.25, M10×1.5, M12×1.75)
Use metric fine / UNC / UNF only when:
Matching existing bolts, studs, or tapped holes
Finer adjustment or specific thread engagement is required
Always match diameter + pitch + standard between bolt and Nylock nut
(e.g., M10×1.5 Nylock DIN 982 with M10×1.5 bolt).
Reusability of Nylock nuts (DIN 982)
Nylock nuts can be reused a limited number of times.
Replace the nut if:
The nylon ring looks flattened, cut, or damaged
The nut spins too freely and no longer generates noticeable prevailing torque
For safety-critical joints, treat Nylock nuts as single-use or limited-use.
Mechanical Properties (Guide)
Nylock nuts follow the same property class logic as standard stainless hex nuts.
They are designed so that the nut proof load safely matches the bolts they are used with.
A2-70 / A4-70 Nylock nuts (DIN 982)
Intended for use with A2-70 / A4-70 bolts (700 MPa tensile class).
Designed to withstand the proof load of the matching bolt without thread stripping or permanent deformation.
Provide reliable clamping + prevailing torque via the nylon insert in standard temperature service.
A4-80 Nylock nuts (DIN 982)
Intended for use with A4-80 bolts (800 MPa tensile class).
Higher proof strength for higher clamp forces in more demanding joints.
Use within the temperature and chemical limits of nylon; for very high temperature, switch to all-metal lock nuts.
Simple selection guide
General stainless joints, normal environment →
→ A2-70 Nylock nut DIN 982 with A2-70 bolt.
Corrosive / marine / chemical environments →
→ A4-70 or A4-80 Nylock nut DIN 982 with A4 bolts.
High strength + vibration, but moderate temperature →
→ A4-80 Nylock nut DIN 982 with A4-80 bolt.
High temperature or harsh chemicals →
→ Use all-metal lock nut instead of Nylock.
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Frequently Asked Questions
What is a Nylock nut (DIN 982)?
A Nylock nut is a hex lock nut with a nylon insert at the top.
The nylon ring grips the bolt threads and creates prevailing torque, which helps prevent the nut from loosening under vibration or movement. DIN 982 specifies a taller (high) type Nylock nut compared to some low-profile variants.
When should I use a Nylock nut instead of a normal hex nut?
Use a Nylock nut when:
The joint is exposed to vibration or light to medium shock
You want an integrated locking feature without separate spring washers or thread-locker
The joint will be opened and closed occasionally, but not constantly
For purely static joints, a standard hex nut is usually sufficient.
What’s the difference between DIN 982 and DIN 985 Nylock nuts?
Both are Nylock nuts with a nylon insert, but:
DIN 982 → Higher (full) height Nylock nut – generally higher load capacity.
DIN 985 → Lower (thin) Nylock nut – more compact, used where space is limited.
For structural or higher-loaded joints, DIN 982 is usually preferred.
Should I choose A2 or A4 stainless steel Nylock 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 the application is near the sea, in cooling towers, chemical plants, or harsh outdoor conditions, A4 Nylock nuts are recommended.
Which bolt grade should I use with Nylock nuts?
Match or exceed the bolt’s strength class:
With A2-70 / A4-70 bolts → use A2-70 / A4-70 Nylock nuts (DIN 982).
With A4-80 bolts → use A4-80 Nylock nuts or consider all-metal lock nuts for very high duty or high temperature.
Rule: The Nylock nut property class should be ≥ bolt class in the same stainless family.
