Nuts · DIN 982
DIN 982 Nylock Nut
Accurate Fastners supplies cold-forged DIN 982 Nylock Nuts in stainless steel grades SS 304 and SS 316, available from M5 to M16. These prevailing-torque nuts are manufactured to the DIN 982 standard and are commonly used across industries where vibration resistance and reliable fastening are required.
- Standard
- DIN 982
- Grades
- 304 / 316
- Size
- M5 – M16
- Length
- —
Overview
What is the DIN 982 Nylock Nut?
The DIN 982 Nylock Nut is a hexagonal prevailing-torque nut that incorporates a nylon insert at the top of the nut body. Governed by the DIN 982 standard, this nut type is widely recognised in engineering for its ability to resist unintentional loosening. The nylon collar grips the bolt thread and creates a friction-based locking action without requiring any additional locking hardware.
The nut is characterised by a full-height hexagonal body — distinguishing it from the thinner DIN 985 variant — topped by a non-metallic nylon insert. When the nut is driven onto a bolt, the insert deforms slightly around the thread flanks, generating the prevailing torque that resists rotation in service. The external hex profile allows installation using standard spanners or socket tooling, and the internal thread follows the metric thread form.
Accurate Fastners produces these nuts through a cold forging process, which typically results in a dense, consistent grain structure throughout the nut body. The finished parts are supplied in SS 304 and SS 316 stainless steel to suit different environmental and chemical exposure requirements. Quality checks are performed during procurement and at delivery, in line with the company's standard quality control practice.
In Depth
Product description
Construction & Geometry
The DIN 982 Nylock Nut features a full-height hexagonal body with a metric internal thread, produced by cold forging. The defining element is the nylon insert fitted into a recess at the top of the nut. This insert sits proud of the metal crown and has an inner bore smaller than the bolt's nominal diameter, ensuring the thread flanks engage the nylon upon assembly.
The external hex drive profile is consistent with the DIN 982 specification and accepts standard metric tooling. The nut body dimensions — across flats, across corners, and overall height — are governed by the standard, ensuring interchangeability with compliant bolts. The nylon insert is retained mechanically within the metal shell and is not adhesively bonded, which maintains insert integrity during storage and handling.
Functional Behaviour in an Assembly
When assembled, the bolt thread displaces the nylon insert radially as it passes through. The elastic recovery of the nylon creates a clamping force on the thread flanks independent of the joint's clamping load. This prevailing torque is the primary mechanism by which the nut resists loosening under vibration or dynamic loading, without relying solely on friction between bearing surfaces.
Because the locking action is mechanical rather than chemical, the nut may typically be removed and re-used a limited number of times, provided the nylon insert retains sufficient resilience. However, the insert is sensitive to elevated temperatures; it is generally not recommended for sustained high-temperature environments, as heat may degrade the nylon and reduce its locking effectiveness. Confirming service temperature suitability with the application requirements is advisable before selection.
How It Differs from Similar Fasteners
The DIN 982 Nylock Nut is often compared with the DIN 985 nut, which shares the same nylon-insert locking principle but uses a thinner, lower-profile body. DIN 982 provides a taller body and therefore a longer thread engagement length, which may be preferred where higher load capacity or greater thread engagement is needed. Both standards coexist in the market and selection depends on assembly geometry and load requirements.
Compared with all-metal prevailing-torque nuts or serrated-flange locking nuts, the nylon insert type offers the advantage of not marking or damaging the mating surface during tightening, as there are no hardened serrations. Compared with chemically locked nuts requiring adhesive application, DIN 982 nuts offer simpler, cleaner assembly. The stainless steel body of Accurate Fastners' DIN 982 nuts adds corrosion resistance that plain carbon steel variants do not provide.
Material & Grade
Material and grade information
- SS 304
- SS 316
Accurate Fastners offers DIN 982 Nylock Nuts in SS 304 and SS 316 stainless steel. SS 304 is an austenitic grade containing chromium and nickel, commonly used in a wide range of general industrial and light-duty environments where moderate corrosion resistance is adequate. It is typically suitable for indoor assemblies, food-adjacent equipment, and applications where exposure to chlorides is minimal or infrequent.
SS 316 contains an addition of molybdenum, which generally improves resistance to pitting and crevice corrosion, particularly in chloride-containing environments. This makes SS 316 a commonly preferred choice for pharmaceutical machinery, marine-adjacent applications, and chemical processing equipment. Where grade selection is uncertain, customers are encouraged to discuss their operating environment with the Accurate Fastners sales team to confirm the most appropriate material.
Grades shown are those documented for this product in the Accurate Fastners brochure. General material notes are guidance only; confirm grade selection for your environment.
Technical Data
Technical specifications
| Product type | Nut – DIN 982 Nylock Nut |
|---|---|
| Material | Stainless steel |
| Material grade | SS 304, SS 316 |
| Applicable standard | DIN 982 |
| Nominal diameter / size | M5 – M16 |
| Thread type | Metric internal thread |
| Head / form | Hexagon with nylon insert |
| Drive / tightening | External hex |
| Manufacturing process | Cold forged |
Sizes
Available sizes
Documented size range
M5 – M16
Documented length range
Not applicable
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
RO Water Purifier Assemblies
Nylock nuts are commonly used in water purifier frames and pressure vessel mounting, where vibration from pumps and flow dynamics may otherwise cause conventional nuts to work loose over time.
Submersible Pump Components
In submersible pump housings and motor enclosures, the nylon insert provides vibration-resistant fastening, while the stainless steel body offers corrosion resistance in wet and submerged conditions.
Solar Energy Mounting Structures
Solar panel racking systems are subject to wind-induced vibration and thermal cycling. DIN 982 Nylock Nuts in SS 304 or SS 316 may help maintain joint integrity in these outdoor structural assemblies.
LED Lighting Enclosures
Light fittings and driver housings often require fasteners that stay secure through operational vibration. Nylock nuts offer a clean, tool-accessible locking solution suited to panel and enclosure assembly.
Pharmaceutical & Food Machinery
SS 316 DIN 982 Nylock Nuts may be considered for equipment in food processing or pharmaceutical environments where corrosion resistance and hygienic material compatibility are important selection criteria.
Features & Selection
Features and selection considerations
Design features
Nylon Insert Locking
The integrated nylon collar creates prevailing torque on the bolt thread, resisting loosening without secondary locking devices, clips, or thread-locking compounds.
Full-Height Hexagonal Body
DIN 982 specifies a full-height nut body, providing longer thread engagement compared with half-height or thin-profile variants, which may improve load distribution.
Cold Forged Manufacturing
Cold forging produces a nut body with a consistent, dense grain structure, contributing to dimensional accuracy and mechanical integrity across the production batch.
Metric Thread Profile
The internal metric thread conforms to standard pitch dimensions across the M5–M16 range, ensuring compatibility with DIN-compliant bolts and threaded rod.
Stainless Steel Body
Available in SS 304 and SS 316, the nut body offers inherent corrosion resistance suited to industrial environments, combining the locking action with material durability.
Before you order
Thread Size & Pitch Confirmation
Confirm the required nominal diameter within the M5–M16 range and verify the thread pitch against the mating bolt. Standard metric coarse pitches are typical for DIN 982, but enquiry should clarify if fine pitch is needed.
Grade Selection by Environment
Choose between SS 304 and SS 316 based on the likely exposure conditions. Chloride-rich, wet, or chemically active environments generally favour SS 316, while SS 304 may be adequate for lighter-duty or indoor service.
Mating Fastener Compatibility
The DIN 982 Nylock Nut is designed for use with metric hex bolts or threaded rod. Ensure the bolt thread class and surface finish are compatible with the nut to achieve correct prevailing torque and joint integrity.
Quantity & Documentation Requirements
For bulk or project orders, advise the Accurate Fastners team of required quantities, packaging preferences, and whether material test reports or dimensional inspection documentation are needed at the time of enquiry.
FAQs
Frequently asked questions
What sizes of DIN 982 Nylock Nuts does Accurate Fastners supply?
Accurate Fastners supplies DIN 982 Nylock Nuts in the M5 to M16 diameter range. For sizes outside this range or specific pitch requirements, please contact the sales team directly to discuss availability and options.
Which stainless steel grades are available for DIN 982 Nylock Nuts?
The nuts are available in SS 304 and SS 316. SS 304 suits general industrial use, while SS 316 offers improved resistance to chlorides and is commonly selected for pharmaceutical, food processing, or wet environments.
What does the DIN 982 standard specify?
DIN 982 is a German dimensional standard for hexagonal nuts with a nylon insert, specifying the full-height body form. It defines dimensions such as width across flats, height, and thread tolerance, ensuring interchangeability with compliant fasteners.
Can the nylon insert be used at high temperatures?
Nylon inserts are generally sensitive to sustained elevated temperatures, which may reduce locking effectiveness. If the application involves high thermal exposure, confirming temperature suitability before selection is advisable. The Accurate Fastners team can assist with guidance on enquiry.
What other fasteners are commonly used alongside DIN 982 Nylock Nuts?
These nuts are typically paired with metric hex bolts, hex cap screws, or threaded rod of compatible grade and pitch. Accurate Fastners also supplies a range of washers, bolts, and other nuts that may be specified alongside Nylock nuts in an assembly.
How can I request a quotation for DIN 982 Nylock Nuts?
Quotations can be requested via the enquiry form on the website, by emailing export@accuratefastners.com, or through WhatsApp. Please include the required diameter, grade, quantity, and any documentation requirements to receive an accurate and prompt response.
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