Nylock Jam Nuts
What are Nylock Jam Nuts?
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.
Asiad Steel Industries is a trusted manufacturer, supplier, and exporter of premium Nylock Jam Nuts available in various types, sizes, grades, and finishes, ensuring secure locking, vibration resistance, and long-lasting fastening performance across industries worldwide.
Key Features
Leak-Proof
Jointing
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Size | M3 to M48 (Metric), 1/8″ to 2″ (Inch sizes, custom on request) |
| Thread Standards | Metric / Imperial | ISO Metric (M), UNC, UNF, BSW, BSF, DIN, ANSI, JIS |
| Product Types | Nylock Jam Nuts | Low-profile hexagonal nuts with nylon insert for vibration resistance |
| Material Options | Stainless Steel Grades | SS 304, SS 316, SS 316L |
| Carbon & Alloy Steel | Grade 5, Grade 8, EN8, EN19 | |
| Brass & Copper Alloys | CZ121, Naval Brass, Phosphor Bronze | |
| Other Materials | Nylon-coated steel, Titanium (custom) | |
| Standards & Certifications | ASTM | ASTM A194, ASTM A563 |
| DIN / ISO | DIN 985, ISO 10511 | |
| ASME / ANSI | ASME B18.16.6 | |
| Certifications | ISO 9001, IATF 16949, RoHS, PED 2014/68/EU | |
| Design Features | Locking Mechanism | Nylon insert provides prevailing torque to resist loosening |
| Profile | Jam type – low height compared to standard hex nut | |
| Threads | Coarse & Fine threads, right-hand & left-hand available | |
| Coating & Surface Finish | Anti-Corrosion Coating | Zinc Plated, Hot Dip Galvanized, Geomet |
| Optional Coatings | PTFE, Black Oxide, Nickel, Cadmium | |
| Surface Finish | Polished, Self-Color, Passivated | |
| Testing & Inspection | Mechanical Testing | Tensile, Proof Load, Hardness, Prevailing Torque Test |
| Non-Destructive Testing | Visual, Magnetic Particle (MPI) | |
| Dimensional Accuracy | GO/NO-GO Gauges, Thread Inspection per ISO/DIN | |
| Certification | 3.1 / 3.2 MTC as per EN 10204 |
Dimensions (Jam Nut – DIN 985 / ISO 10511)
| Nominal Size (M / Inch) | Outer Diameter (OD) / mm | Width Across Flats (WAF) / mm | Height / mm | Thread Pitch / mm | Thread Type | Recommended Torque / Nm |
|---|---|---|---|---|---|---|
| M3 | 5.5 | 5 | 2 | 0.5 | Coarse | 1.2 |
| M4 | 7 | 7 | 2.5 | 0.7 | Coarse | 2.5 |
| M5 | 8 | 8 | 3 | 0.8 | Coarse | 4 |
| M6 | 10 | 10 | 3 | 1.0 | Coarse | 7 |
| M8 | 13 | 13 | 4 | 1.25 | Coarse | 16 |
| M10 | 16 | 16 | 5 | 1.5 | Coarse | 28 |
| M12 | 18 | 18 | 5 | 1.75 | Coarse | 45 |
| M14 | 21 | 21 | 6 | 2.0 | Coarse | 70 |
| M16 | 24 | 24 | 6 | 2.0 | Coarse | 95 |
| M18 | 27 | 27 | 7 | 2.5 | Coarse | 130 |
| M20 | 30 | 30 | 7 | 2.5 | Coarse | 170 |
| M22 | 32 | 32 | 8 | 2.5 | Coarse | 210 |
| M24 | 36 | 36 | 8 | 3.0 | Coarse | 260 |
| M27 | 41 | 41 | 9 | 3.0 | Coarse | 330 |
| M30 | 46 | 46 | 10 | 3.5 | Coarse | 430 |
| M33 | 50 | 50 | 10 | 3.5 | Coarse | 520 |
| M36 | 55 | 55 | 11 | 4.0 | Coarse | 650 |
| M39 | 60 | 60 | 12 | 4.0 | Coarse | 780 |
| M42 | 65 | 65 | 12 | 4.5 | Coarse | 900 |
| M45 | 70 | 70 | 13 | 4.5 | Coarse | 1050 |
| M48 | 75 | 75 | 13 | 5.0 | Coarse | 1200 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 400 – 900 | MPa (Carbon Steel, Stainless Steel, Alloy Steel) |
| Yield Strength | 200 – 500 | MPa |
| Hardness | 100 – 220 | HB (Brinell) |
| Elongation | ≥ 10 – 25 | % |
| Density | 7.7 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 20 – 65 | J (Charpy, grade-dependent) |
| Modulus of Elasticity (E) | ~190 | GPa |
| Fatigue Strength | 200 – 400 | MPa |
| Corrosion Resistance | Good to Excellent (SS > CS > Alloy Steel) | – |
| Thermal Conductivity | 15 – 50 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 18 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.40 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Surface Finish | Serrated / Stock / Smooth finish per DIN 985 / ISO 10511 | – |
| Locking Mechanism | Nylon Insert | – |
| Operating Temperature Range | -40 to 120 | °C (nylon-dependent) |
| Recommended Torque Range | As per ISO / DIN standards | Nm |
| Thread Type | Coarse & Fine available | – |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | 10.0 – 14.0 | 10.0 – 14.0 |
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
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?
Can Nylock jam nuts be reused?
Are Nylock jam nuts heat-resistant?
Do you supply bulk quantities with test certification?
