Nylock Jam Nuts
What is a Nylock Jam Nut?
A Nylock Jam Nut is a low-profile, internally threaded hex nut integrated with a nylon insert that provides vibration resistance and self-locking capability. Combining the space-saving design of a jam nut with the anti-loosening benefits of a nylon ring, Nylock jam nuts are ideal for applications where secure fastening is critical, and installation space is limited.
Commonly used in automotive, aerospace, and machinery applications, these nuts are effective in preventing thread loosening caused by vibration, motion, or dynamic loads.
Key Features
- Nylon Insert Locking – Prevents loosening from vibration or movement.
- Low-Profile Design – Thinner than standard Nylock nuts, ideal for compact assemblies.
- Reusable with Limitations – Can be reused a few times before the nylon insert wears.
- Thread Compatibility – Suitable for use with metric and imperial threaded fasteners.
- Corrosion Resistant Options – Available in stainless steel and coated carbon steel versions.
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Specification |
|---|---|
| Size Range | M3 to M36 |
| Thread Types | Metric, UNC, UNF |
| Manufacturing Methods | Cold Forged, Hot Forged, CNC Machined |
| Material Options | Carbon Steel, Alloy Steel, Stainless Steel |
| Standards | DIN 985 (Low Type), ISO 10511, IFI-100/107 |
| Finishes Available | Zinc Plated, Galvanized, Black Oxide, Phosphate |
| Property | Value |
|---|---|
| Proof Load | 400 – 900 MPa (grade-specific) |
| Hardness | 100 – 300 HB |
| Elongation | 10% – 20% |
| Temperature Range | -50°C to 120°C (due to nylon insert) |
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.42 – 0.50 |
| Manganese (Mn) | 0.60 – 0.90 |
| Silicon (Si) | 0.10 – 0.35 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.050 |
| Iron (Fe) | Balance |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A563, A194 |
| DIN | 985 (Low Type) |
| ISO | 10511 |
| JIS | B1186 |
| BS | 1768 |
| Nut Size (mm) | Thread Pitch (mm) | Weight (kg) |
|---|---|---|
| M6 | 1.0 | 0.45 |
| M8 | 1.25 | 0.85 |
| M10 | 1.5 | 1.45 |
| M12 | 1.75 | 2.50 |
| M16 | 2.0 | 4.60 |
| M20 | 2.5 | 7.80 |
Applications of Nylock Jam Nuts
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is the purpose of the nylon insert in a Nylock jam nut?
The nylon ring increases friction on the bolt threads, preventing the nut from loosening due to vibration or movement.
Can Nylock jam nuts be reused?
Yes, but reuse is limited. After several installations, the nylon insert may lose its effectiveness and should be replaced.
Are Nylock jam nuts heat-resistant?
They are effective up to around 120°C. For higher-temperature applications, consider all-metal lock nuts.
Do you supply bulk quantities with test certification?
Yes, we support bulk orders and provide material test certificates, compliance reports, and export documentation as required.
