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DIN6926
Standard: DIN 6926 (Ref. ISO 7043 / ISO 12125 / EN 1663)
Product Type: Prevailing Torque Type Hexagon Nut with Flange & Non-Metallic Insert
Thread Range: M5 to M20 (Metric Coarse Pitch, Tolerance 6H)
Strength Classes: Class 8, Class 10 | Stainless Steel A2-70, A4-80
Primary Function: Vibration-proof self-locking + Surface load distribution
The DIN 6926 Prevailing Torque Hex Flange Nut is a one-piece self-locking fastener engineered for high-vibration structural and mechanical connections. It combines two critical fastening functions into a single component:
Prevailing Torque Self-Locking: An integrated non-metallic polyamide (Nylon 66) ring sits at the top collar of the nut. When mated with an external bolt thread, the nylon deforms elastically rather than cutting, creating a high-friction radial grip along the thread flanks that prevents rotation under dynamic vibration.
Integrated Flange Bearing Face: A wide, smooth flange base distributes the clamping preload over a broader contact area, reducing surface pressure on softer base materials and effectively spanning slotted or oversized clearance holes.
Elimination of Loose Washers: The integral flange replaces separate flat and spring washers, reducing part numbers on the bill of materials (BOM), lowering assembly cycle times, and preventing operator installation errors.
Non-Damaging Thread Engagement: Unlike all-metal lock nuts that use deformed threads, the nylon insert will not gall, score, or strip the mating bolt threads during installation or disassembly.
Resistant to Dynamic Loosening: Specifically designed for machinery, automotive chassis, and renewable energy structures subject to continuous transverse and axial vibration.
Controlled Clamping Pressure: The wide flange surface minimizes localized surface deformation (embedment) on aluminum, composites, painted steel, or plastic-joint interfaces.
Parameter | Standard Data / Engineering Requirement |
|---|---|
Manufacturing Standard | DIN 6926 |
Thread Specification | Metric Coarse Pitch, ISO 965-2 / 6H |
Flange Design | Non-serrated, smooth bearing surface |
Locking Element | Polyamide (Nylon 66) insert collar |
Working Temperature Range | -50°C to +120°C (-58°F to +248°F) |
Reusability | Multiple re-uses permitted (torque decreases progressively per cycle) |
Size (dd) | Pitch (PP) | Flange Dia. (dcdc max) | Width Across Flats (ss) | Total Height (hh max) | Socket/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 (ISO 898-2):
Class 8: Standard high-strength grade for pairing with Class 8.8 structural bolts.
Class 10: High-tensile property class for heavy mechanical equipment and Class 10.9 bolts.
Austenitic Stainless Steel (ISO 3506-2):
A2-70 (AISI 304): High general atmospheric and moisture corrosion resistance.
A4-80 (AISI 316): Marine-grade corrosion resistance for coastal, chemical, and offshore environments.
Electro-Galvanized (Zinc Plated): Clear/Blue or Yellow trivalent passivation for general indoor/outdoor protection.
Zinc Flake / Dacromet Coating: High-corrosion barrier with thin coating thickness and zero hydrogen embrittlement risk.
Hot-Dip Galvanized (HDG): Heavy sacrificial zinc coating for outdoor infrastructure (requires corresponding thread tolerance matching).
Plain / Passivated: Degreased and passivated finish for stainless steel grades.
Renewable Energy & Solar Tracking: Racking structures, torque tubes, and drive mountings exposed to cyclic wind vibration.
Automotive & Commercial Vehicles: Chassis brackets, engine mount supports, suspension linkages, and cab assemblies.
Heavy Machinery & Plant Equipment: Vibrating screens, compressors, industrial pumps, gearboxes, and conveyor systems.
Agricultural Equipment: Tractors, harvesters, and tillage machinery operating in harsh dynamic environments.
Structural Metal Framing: Structural steel joints utilizing slotted clearance channels.
100% Gauge Inspection: Standard 6H thread tolerance verified by Go / No-Go thread plug gauges.
Prevailing Torque Testing: Torque-in and torque-out validation performed in accordance with ISO 2320.
Material & Test Documentation: EN 10204 Type 3.1 Material Test Reports (MTR), plating thickness certificates, and RoHS compliance reports available on request.
B2B Packaging: Bulk cartons (20–25 kg) palletized for sea freight, or private-label small box packaging.
Q1: How does DIN 6926 differ from an all-metal flange lock nut (DIN 6927)?
A: DIN 6926 uses an elastic nylon ring to generate prevailing torque without damaging bolt threads, suitable up to 120°C. DIN 6927 relies on metallic thread deformation, offering higher temperature resistance (>120°C) but with higher thread friction and galling tendency.
Q2: Can DIN 6926 nuts be installed with high-speed impact tools?
A: Controlled-speed torque tools or calibrated hand tools are recommended. Excessive high-speed friction can generate heat that softens the nylon collar, temporarily reducing locking effectiveness.
Q3: Are these nuts suitable for outdoor marine applications?
A: Yes, when specified in Stainless Steel A4-80 (AISI 316) or high-grade Zinc Flake / Dacromet coating on high-strength carbon steel.
For bulk procurement, dimensional confirmation, or custom material inquiries:
Submit your requested size list, property class, surface treatment, and target quantities via our RFQ form.
Direct engineering and commercial RFQs are processed with complete standard drawings and material test certifications.
