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DIN6926
Frictional Interference Fit: As the external bolt thread enters the unthreaded nylon collar, the insert deforms elastically, generating constant radial friction along the mating thread flanks.
Vibration & Dynamic Load Resistance: Prevents fastener back-off caused by mechanical vibration, rotational forces, and cyclic thermal expansion.
Thread Protection: Unlike all-metal lock nuts that rely on thread pitch deformation, the nylon ring prevents galling and thread damage on both bolt and nut surfaces.
Stress Distribution: Spreads the clamping force over a larger surface area, minimizing surface stress on softer host materials (such as aluminum, plastic, or composite assemblies).
Elimination of Loose Washers: Single-piece assembly reduces Bill of Materials (BOM) complexity, prevents assembly line omissions, and speeds up automated or manual installation.
Hole Bridging: Securely bridges slotted, punched, or oversized clearance holes without pull-through risk.
Parameter | Standard Value / Specification |
|---|---|
Standard Specification | DIN 6926 (Related international equivalents: EN 1663 / ISO 7043 / ISO 12125) |
Thread Standard | Metric coarse pitch, 6H tolerance class |
Nominal Size Range | M5 to M20 (Standard production sizes) |
Drive Type | Metric external hexagon |
Bearing Face | Non-serrated (smooth) flange surface |
Locking Element | Polyamide (Nylon 66) insert |
Standard Operating Temperature | -50°C to +120°C (-58°F to +248°F) |
Thread Size (dd) | Pitch (PP) | Flange Diameter (dcdc max) | Width Across Flats (ss) | Total Height (hh max) | Wrench Size |
|---|---|---|---|---|---|
M5 | 0.8 mm | 11.8 mm | 8.0 mm | 7.1 mm | 8 mm |
M6 | 1.0 mm | 14.2 mm | 10.0 mm | 9.1 mm | 10 mm |
M8 | 1.25 mm | 17.9 mm | 13.0 mm | 11.1 mm | 13 mm |
M10 | 1.5 mm | 21.8 mm | 15.0 mm | 13.5 mm | 15 mm |
M12 | 1.75 mm | 26.0 mm | 18.0 mm | 16.1 mm | 18 mm |
M14 | 2.0 mm | 29.9 mm | 21.0 mm | 18.2 mm | 21 mm |
M16 | 2.0 mm | 34.5 mm | 24.0 mm | 20.3 mm | 24 mm |
M20 | 2.5 mm | 42.8 mm | 30.0 mm | 24.8 mm | 30 mm |
Carbon Steel / Alloy Steel:
Property Class 8: Suitable for pairing with standard metric Grade 8.8 bolts.
Property Class 10: High-tensile grade for pairing with Grade 10.9 structural and mechanical bolts.
Stainless Steel:
A2-70 (AISI 304): High general corrosion resistance for outdoor, food processing, and general industrial environments.
A4-80 (AISI 316): Superior acid and chloride resistance for marine, chemical, and coastal applications.
Zinc Plated (Clear / Blue / Yellow passivated): Standard indoor and light outdoor corrosion protection.
Hot-Dip Galvanized (HDG): Heavy protective zinc coating for harsh atmospheric conditions (requires appropriate thread clearance).
Zinc Flake / Dacromet Coating: High-corrosion resistance without risk of hydrogen embrittlement on high-strength grades.
Black Oxide / Phosphate: Base protection for oiled mechanical assemblies.
Plain / Passivated: Natural finish for stainless steel grades.
Automotive & Transportation: Chassis frames, powertrain assemblies, bracket mountings, and suspension link points.
Solar Racking & Photovoltaic Structures: Mounting frames and tracker linkages subject to sustained wind loads and outdoor exposure.
Industrial Machinery & Equipment: Compressors, pumps, gearboxes, vibrating screens, and material handling systems.
Agricultural & Heavy Construction Machinery: Structural connections exposed to severe terrain vibration and dynamic loading.
Electrical Cabinets & Steel Enclosures: Secure fastening on slotted structural channels.
Thread & Dimension Verification: 100% 6H Go/No-Go thread gauge testing and dimensional tolerance control.
Performance Testing: Prevailing torque verification per ISO 2320.
Documentation & Traceability: Mill Test Certificates (EN 10204 Type 3.1) and surface coating thickness test reports available upon request.
Export Packaging: Small inner box packing with barcode labeling, or heavy-duty bulk cartons (20–25 kg) palletized for ocean/air freight.
DIN 6926 features an integrated flange base that acts as a built-in washer to distribute surface pressure, while DIN 985 is a standard hexagon nylon lock nut without a flange.
Standard polyamide (nylon) locking rings operate reliably within a temperature range of -50°C to +120°C (-58°F to +248°F). For high-temperature environments exceeding 120°C, all-metal prevailing torque lock nuts (such as DIN 6927 or DIN 980) are recommended.
Yes, the nylon ring recovers elastically to allow multiple installations. However, prevailing torque decreases slightly with each reuse cycle. In high-vibration or critical safety joints, replacing lock nuts during major maintenance is recommended.
No additional thread lubricant is required under normal assembly conditions. Standard plating provides adequate lubricity for correct torque-tension relationships.
For bulk pricing, technical drawings, custom materials, or special coating requirements:
Submit your size specifications, quantity, material grade, and delivery terms via the online RFQ form.
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