A1: DIN 985 specifies the dimensions and requirements for standard-profile Hexagon Nylon Insert Locking Nuts, commonly known as Nyloc nuts. As a prevailing torque nut, its key feature is a nylon collar (insert) embedded in its upper portion. When tightened onto a bolt, the nylon deforms and grips the threads, creating friction that resists loosening caused by vibration. It is the most common and economical type of locknut, suitable for a wide range of applications within the nylon insert's temperature range (typically -50°C to +100°C).
A2: The internationally recognized equivalent standard is DIN EN ISO 10511 for non-metallic insert (prevailing torque) locknuts. It covers the same standard profile nuts as DIN 985.
A3: The primary difference is the nut height/profile. DIN 982 defines High (Thick) Nylon Insert Locking Nuts, which have a greater height than the standard-profile nuts defined in DIN 985. This increased height provides a larger wrenching surface, improving tool grip and making them advantageous in confined spaces or for hard-to-reach fasteners. Both types utilize the same nylon insert locking mechanism and share similar performance characteristics regarding temperature limits and reusability.
Material Category |
Typical Grade/ Class |
Standard Finish |
Performance & Key Characteristics |
Typical Applications |
Pros & Cons |
| Medium-Strength Steel | 5 | Zinc-Plated: Basic corrosion resistance for occasional moisture exposure. Zinc Yellow-Chromate: More durable coating for most wet/outdoor environments. |
Standard strength for general-purpose use. Reliable vibration resistance from nylon insert. | Fastening most machinery, equipment, and general industrial assemblies. | Pros: Most cost-effective, versatile, widely available. Cons: Not for high corrosion/chem. exposure; temp. limited by nylon insert. |
| High-Strength Steel | 8 / 10 | Zinc-Plated: Provides basic corrosion protection. | ~25% stronger than medium-strength grades. Ensures integrity in high-stress, vibrating connections. | Critical applications: automotive, valves, pumps, motors, and structural components. | Pros: High load capacity with locking feature. Cons: Must mate with high-strength screws; limited corrosion resistance. |
| Corrosion-Resistant Stainless Steel (A2) | A2-70 (18-8) | Naturally corrosion-resistant; no plating needed. | Good corrosion resistance, resists rust from water and mild chemicals. Non-magnetic (annealed). | Outdoor fittings, marine interiors, food processing, chemical plants (mild exposure). | Pros: Excellent balance of corrosion resistance, strength, and cost. Cons: Not for severe chlorides/chemicals. |
| Corrosion-Resistant Stainless Steel (A4) | A4-80 (316) | Naturally corrosion-resistant; no plating needed. | Excellent corrosion resistance, withstands harsh weather, salt water, and most chemicals. | Marine exteriors, coastal infrastructure, high-corrosion chemical environments. | Pros: Maximum durability in aggressive environments. Cons: Higher cost; slightly lower mechanical strength than equivalent grade steel nuts. |
Locking Mechanism: Relies on a nylon insert. Performance degrades at sustained high temperatures (consult specs, typically max ~100°C-120°C).
Reusability: Can be reused several times, but the prevailing torque (locking force) decreases with each reinstallation.
Critical Installation Rule: Always match the nut's strength grade (e.g., Grade 8) with a comparable or higher-strength screw/bolt to prevent thread stripping.
Application Range: Suitable for thread diameters ranging from approximately M3 to M48.
| CLICK VIEW ONLIN | DIN 985 Dimensions | DIN 985 weight chart |
| CLICK DOWNLOAD | DIN 985 Dimensions pdf | DIN 985 weight chart pdf |
PIC |
PRODUCT |
SIZE |
GRADE |
FINISH |
THREAD |
 |
Hexagon Nylon Locking Nuts (DIN 985) - Stainless Steel (A2) | M1.6-M36 | A2 Grade | Natural | Coarse |
|
Hexagon Nylon Locking Nuts (DIN 985) - Marine Stainless Steel (A4) | M1.6-M36 | A4 Grade | Natural | Coarse |
|
Hexagon Nylon Locking Nuts (DIN 985) - Bright Zinc Plated Carbon Steel (Class 6) | M1.6-M48 | 6 Grade | Zinc CR3 | Coarse |
|
Hexagon Nylon Locking Nuts (DIN 985) - Bright Zinc Plated Carbon Steel (Class8) | M1.6-M48 | 8 Grade | Zinc CR3 | Coarse |
|
Hexagon Nylon Locking Nuts (DIN 985) - Bright Zinc Plated Carbon Steel (Class 10) | M6-M36 | 10 Grade | Zinc CR3 | Coarse |