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Nylock nuts are specialized self-locking fasteners designed with a nylon insert that resists loosening under vibration and dynamic load conditions. These nuts are widely used in automotive assemblies, heavy machinery, and structural engineering applications where joint integrity is critical. The nylon ring creates prevailing torque against the bolt threads, preventing accidental loosening without the need for additional locking components like washers or adhesives.
| Parameter | Specification / Range |
|---|---|
| Material Variants | Stainless Steel 304, Stainless Steel 316, Carbon Steel, Alloy Steel, Brass (special order) |
| Grade Options | A2-70, A4-70, 8.8, 10.9 (depending on base material) |
| Size / Dimension Range | M3 to M48 (Metric), #6 to 1-1/2” (UNC/UNF) |
| Thread Type | Metric (M), UNC, UNF, BSF (on request) |
| Standards | DIN 985, ISO 7040, ISO 10511, ASTM F594 |
| Surface Finish | Zinc Plated, Hot Dip Galvanized, Black Oxide, Plain, Nickel Plated |
| Type Variants | Hex Nylock Nut, Heavy Hex Nylock Nut, Flanged Nylock Nut |
| Hardness / Tensile Strength | Up to 8.8 / 10.9 grade equivalent; tensile strength up to 1000 MPa (material dependent) |
| Thread size d | M5 | M6 | M7 | M8 | M10 | M12 | M14 | M16 | M18 | M20 | M22 | M24 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| - | - | - | M8x1 | M10x1 | M12x1,5 | M14x1,5 | M16x1,5 | M18x2 | M20x2 | M22x2 | M24x2 | ||
| - | - | - | - | M10x1,25 | M12x1,25 | - | - | M18x1,5 | M20x2 | M22x2 | - | ||
| P | 0,8 | 1 | 1 | 1,25 | 1,5 | 1,75 | 2 | 2 | 2,5 | 2,5 | 2,5 | 3 | |
| da | min. | 5 | 6 | 7 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
| max. | 5,75 | 6,75 | 7,75 | 8,75 | 10,8 | 13 | 15,1 | 17,3 | 19,5 | 21,6 | 23,7 | 25,9 | |
| dw | min. | 6,9 | 8,9 | 9,6 | 11,6 | 15,6 | 17,4 | 20,5 | 22,5 | 24,9 | 27,7 | 29,5 | 33,2 |
| e | min. | 8,79 | 11,05 | 12,12 | 14,38 | 18,9 | 21,1 | 24,49 | 26,75 | 29,56 | 32,95 | 35,03 | 29,55 |
| h | max. = nominal size | 6,3 | 8 | 8,5 | 9,5 | 11,5 | 14 | 16 | 18 | 20 | 22 | 25 | 28 |
| min. | 6 | 7,7 | 8,2 | 9,14 | 11,14 | 13,64 | 15,3 | 17,3 | 19,16 | 20,7 | 23,7 | 26,7 | |
| m | min. | 4,4 | 4,9 | 6,14 | 6,44 | 8,04 | 10,37 | 12,1 | 14,1 | 15,1 | 16,9 | 18,1 | 20,2 |
| m´ | min. | 3,52 | 3,92 | 4,91 | 5,15 | 6,43 | 8,3 | 9,68 | 11,28 | 12,08 | 13,52 | 14,48 | 16,16 |
| s | max. = nominal size | 8 | 10 | 11 | 13 | 17 | 19 | 22 | 24 | 27 | 30 | 32 | 36 |
| min. | 7,78 | 9,78 | 10,73 | 12,73 | 16,73 | 19,67 | 21,67 | 23,67 | 26,16 | 29,16 | 31 | 35 | |
| Weight (7,85 kg/dm3) kg/1000pcs | 1,4 | 3,1 | 3,2 | 6 | 11,7 | 16,6 | 21 | 37,8 | 51,6 | 68 | 86 | 127 | |
| Size Metric | Weight |
|---|---|
| M3 | 0.5 |
| M4 | 1.0 |
| M5 | 1.4 |
| M6 | 2.4 |
| M7 | 3.0 |
| M8 | 5.1 |
| M10 | 10.6 |
| M12 | 17.2 |
| M14 | 26 |
| M16 | 34 |
| M18 | 45 |
| M20 | 65 |
| M22 | 75 |
| M24 | 100 |
| M27 | 162 |
| M30 | 212 |
| M33 | 317 |
| M36 | 415 |
| M39 | 499 |
| M42 | 628 |
| M45 | 771 |
| M48 | 998 |
Nylock nuts are used wherever vibration resistance and secure fastening are essential to prevent mechanical loosening in dynamic environments. Their locking mechanism makes them suitable for both light-duty and heavy-duty engineering systems.
Nylock nuts are manufactured using precision cold forging processes followed by thread rolling to achieve superior grain structure alignment and mechanical strength. The nylon insert is precisely molded and integrated into the nut body under controlled conditions to ensure consistent prevailing torque performance.
Each batch undergoes dimensional inspection, hardness testing, and thread gauge verification to ensure compliance with DIN 985 and ISO 7040 standards. Surface treatments such as zinc plating or black oxide coating are applied based on application requirements.
KK Fasteners implements full lot traceability and multi-stage quality checks aligned with ISO 9001:2015 standards, ensuring every nut meets stringent industrial performance requirements before dispatch.
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Nylock nuts are self-locking hex nuts that include a nylon insert inside the top section. This insert creates friction against the bolt threads, preventing loosening caused by vibration or dynamic loads. They are widely used in automotive, machinery, and structural assemblies where secure fastening is essential.
Nylock nuts are manufactured using stainless steel (SS 304, SS 316), carbon steel, and alloy steel. Stainless steel variants offer strong corrosion resistance for outdoor and marine environments, while carbon steel and alloy steel grades are preferred for high-strength industrial applications.
These nuts are typically produced in compliance with DIN 985, ISO 7040, ISO 10511, and ASTM F594 standards. These international specifications ensure proper dimensional accuracy, thread compatibility, and consistent locking performance across global applications.
Selection depends on operating conditions. For corrosive or marine environments, SS 316 is preferred. For general engineering, SS 304 or carbon steel is suitable. For high-load structural applications, alloy steel grades provide better strength and torque retention.
Look for ISO-certified manufacturers with proven export experience, strict quality testing, and material traceability. Suppliers like KK Fasteners provide standardized production, documentation support, and global supply consistency for OEM and industrial buyers.
Nylock nuts play a critical role in ensuring vibration-resistant and failure-safe fastening across industrial systems. With strict adherence to international standards and controlled manufacturing processes, KK Fasteners delivers precision-engineered solutions tailored for global engineering requirements.
For technical specifications, bulk pricing, or customized export orders, connect with the engineering team at KK Fasteners to receive a detailed quotation and application support.
