Hex Nuts vs. Nyloc Nuts
Comparing 2 standards across 11 specifications. 11 key differences identified.
The Standard Hex Nut (standardized under ISO 4032, DIN 934, and ASME B18.2.2) is a 6-sided internal-threaded mechanical fastener. Paired with mating machine screws and structural bolts, it converts rotational tightening torque into axial clamping preload across industrial and architectural assemblies.
The Nyloc Nut (Nylon-Insert Lock Nut / Prevailing Torque Nut, standardized under ISO 7040 and DIN 985) incorporates a non-threaded polymer nylon ring permanently captured in an upper crown collar. When threaded onto a bolt, the nylon insert deforms elastically around the bolt threads, generating high frictional prevailing torque that prevents vibrational back-off.
Specification Comparison Table
11 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standard Specifications
|
ISO 4032 (Standard style 1) / DIN 934 / ASME B18.2.2 | ISO 7040 (Standard height) / ISO 10511 (Low profile) / DIN 985 / ASME B18.16.6 |
|
Geometry
|
6-sided regular hexagonal prism with internal tapped thread and double chamfered faces | — |
|
Nominal Height Ratio
|
Height ≈ 0.8× Nominal Diameter (m ≈ 0.8D) | — |
|
Metric Property Classes
|
Class 6, Class 8 (for 8.8 bolts), Class 10 (for 10.9 bolts), Class 12 (for 12.9 bolts) | — |
|
Imperial Strength Grades
|
Grade 2 (plain), Grade 5 (dot markings), Grade 8 (corner dots/notches) | — |
|
Jam Nut Variant
|
ISO 4035 / DIN 439 (Thin half-height hex nut used for locking) | — |
|
Locking Mechanism
|
— | Radial elastic compression of unthreaded polyamide nylon collar |
|
Operating Temperature Range
|
— | -50°C to +120°C (-58°F to +248°F) |
|
Prevailing Torque Behavior
|
— | Maintains locking friction even without axial bolt preload (free-spinning torque) |
|
Reusability Guidelines
|
— | Reusable 2 to 3 times before nylon wear reduces prevailing torque below safety limits |
|
Primary Applications
|
— | Automotive suspension, aircraft, lawnmowers, go-karts, robotic actuators |