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DIN6926
Elastic Deformation Locking: As the mating bolt thread passes through the unthreaded nylon insert, the polymer elastically deforms rather than cuts, creating continuous radial friction along the thread flanks.
Vibration & Shock Resistance: Effectively resists back-off caused by transverse vibration, rotational shocks, and thermal expansion cycles.
Reusable Locking Action: The elastic nature of the nylon ring allows multiple re-installations while retaining substantial prevailing torque (recommended inspection after repeat assemblies).
Optimized Pressure Distribution: The wide circular flange acts as an integrated washer, distributing clamping stress over a larger contact surface to protect mating components from surface indentation.
Oversized / Slotted Hole Bridging: Spans oversized or slotted clearance holes securely, preventing pull-through.
Assembly Efficiency: One-piece design eliminates loose washers, preventing assembly errors, reducing inventory SKUs, and speeding up high-volume production lines.
Unlike all-metal prevailing torque nuts that deform steel threads, the nylon insert prevents galling and damage to bolt threads, preserving the integrity of both internal and external threads.
Parameter | Specification / Standard |
|---|---|
Standard Reference | DIN 6926 (Equivalent / Related: EN 1663, ISO 7043, ISO 12125) |
Thread Type | Metric Coarse Thread (ISO 261 / ISO 965-2), 6H Tolerance |
Size Range | M5, M6, M8, M10, M12, M14, M16, M20 (Custom sizes available upon request) |
Drive Style | Standard Metric External Hexagon |
Flange Style | Smooth / Non-serrated Flange Face (Standard DIN 6926 configuration) |
Locking Element | Non-Metallic Insert (Polyamide / Nylon 66 Ring) |
Operating Temperature | -50°C to +120°C (-58°F to +248°F) depending on environment |
Size (d) | Thread Pitch (P) | Flange Diameter (dcdc max) | Width Across Flats (s) | Total Nut Height (h 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 |
Note: Dimensional values correspond to standard DIN 6926 tolerances. Exact production drawings and batch inspection sheets are provided upon order confirmation.
Carbon Steel / Alloy Steel:
Class 8: Suitable for pairing with Grade 8.8 metric bolts in general mechanical and automotive structures.
Class 10: High-tensile strength for pairing with Grade 10.9 structural bolts in heavy equipment and load-bearing assemblies.
Stainless Steel:
A2-70 (AISI 304): High corrosion resistance for outdoor, food processing, water treatment, and standard industrial use.
A4-80 (AISI 316): Marine-grade corrosion resistance for chemical processing, offshore, and coastal installations.
Zinc Plating (CR3+ Blue/White & Yellow Zinc): General-purpose indoor/outdoor corrosion protection (ISO 4042).
Hot-Dip Galvanizing (HDG): Heavy-duty atmospheric barrier for infrastructure (oversized thread tapping applied where applicable).
Dacromet / Geomet (Zinc Flake Coating): Thin, high-corrosion barrier (720–1500h salt spray) with zero hydrogen embrittlement risk for high-tensile grades.
Black Oxide / Phosphate: Lubricated finish for oiled mechanical applications.
Plain / Passivated: Standard clean finish for stainless steel options.
Automotive & Commercial Vehicles: Engine mounts, chassis suspension, frame brackets, exhaust heat shields, and dynamic drivetrain components.
Solar Mounting Systems & Renewables: Photovoltaic racking assemblies, wind turbine sub-assemblies, and tracker linkages subject to sustained wind loads.
Agricultural & Heavy Construction Machinery: Harvesters, excavators, conveyor systems, and vibrating screening equipment.
Railway & Transport Infrastructure: Signaling brackets, trackside switchgear, and rolling stock cabinetry.
Pumps, Compressors & Power Tools: High-vibration housings, motors, fans, and industrial gearbox mountings.
Dimensional & Thread Verification: 100% 6H Go/No-Go plug gauge inspection for pitch accuracy and prevailing torque compliance.
Prevailing Torque Testing: Verified torque-in and torque-out testing per ISO 2320 / DIN EN ISO 2320.
Certificates & Traceability: Material Test Reports (MTR / EN 10204 Type 3.1), salt spray test reports, and RoHs / REACH compliance documentation available upon request.
Flexible Export Packaging:
Small box packaging (e.g., 100/200/500 pcs) with custom private labeling and barcodes.
Heavy-duty export bulk cartons (25 kg) palletized on fumigated wooden or plastic pallets.
Global Shipping & Incoterms: Supporting FOB, CIF, CFR, and DAP delivery terms with reliable ocean, air, and multimodal logistics.
A: While both feature a nylon insert for prevailing torque locking, DIN 6926 includes an integrated flanged base, whereas DIN 985 is a standard hexagon profile requiring a separate washer. DIN 6926 spreads the clamping load over a larger area, reduces assembly steps, and provides higher stability on slotted holes.
A: The standard polyamide (Nylon 66) insert performs reliably between -50°C and +120°C (-58°F to +248°F). For applications exceeding 120°C, all-metal prevailing torque lock nuts (such as DIN 6927 or DIN 980) should be specified.
A: Yes, the elastic recovery of the nylon ring permits multiple installations. However, prevailing torque decreases slightly with each reuse. For critical safety or high-vibration applications, replacing lock nuts during major maintenance overhauls is standard industry practice.
A: No additional lubricant is required. Standard plated finishes provide sufficient lubricity. When tightening, always follow specified assembly torque values and avoid high-speed impact wrenches that could generate excessive friction heat in the nylon insert.
A: Yes. In addition to standard metric coarse sizes (M5–M20 in Class 8 and 10), we support fine pitch threads, stainless steel (A2/A4), special plating finishes, and custom OEM packaging according to customer drawings and technical specifications.
Looking for dependable, standard-compliant DIN 6926 Hex Flange Nylon Insert Nuts for your manufacturing or distribution supply chain?
Inquire Online: Submit your size list, quantity, material grade, and surface finish requirements via our Online RFQ Form.
Direct Email Contact: Send your procurement inquiries and technical drawings to tony@wf-fastener.com.
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