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DIN6796
SUNZO
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Product Overview
DIN 6796 is an active anti-loosening component specifically designed for medium-and high-load bolted connections; it is also known as a conical elastic washer or heavy-duty bolted connection washer. Leveraging the axial deformation characteristics of its disc-shaped structure, this product stores elastic potential energy during bolt pre-tightening, thereby continuously providing the connection pair with a stable pre-tightening force. It effectively compensates for loss of clamping force caused by vibration, wear, creep, thermal expansion and contraction, among other factors, serving as an upgraded alternative to the traditional "flat washer + standard elastic washer" combination.
Core Advantage
Outstanding anti-loosening performance: According to the DIN 25201-4 transverse vibration standard test, the M10 specification maintains a 75.67% clamping force retention rate – which is 1.59 times higher than that of the traditional flat washer + elastic washer combination.
Elastic preload retention: The conical design continuously applies an axial preload force, compensating for the reduction in clamping force caused by material creep, temperature fluctuations, or seal compression.
Heavy-load compatibility design: The maximum flattening force corresponds to 70%–90% of the 8.8 or 10.9-grade bolt clamping force, ensuring perfect compatibility for heavy-load bolted connections.
Elastic stability and reliability: Preferably use high-elasticity spring steels such as 65Mn, 60Si2MnA, or 50CrVA; the hardness should be consistently maintained between 420–510 HV to ensure no loosening or fracture during long-term use.
Versatile surface treatments: Blackening, electroplating, phosphating, zinc plating (Dakro/Jimet), mechanical zinc plating, etc., to meet various corrosion protection requirements.
Application Area
Application Industry | Typical Application Locations | Core Functions & Roles |
Wind Power / New Energy | Tower flange bolts, PV bracket fastening, energy storage cabinet connections | Withstands outdoor wind vibration and temperature cycling; maintains long-term bolt preload; reduces high-altitude O&M operations |
Automotive Manufacturing | Powertrain bolts, chassis connection pairs, NEV wire-controlled braking / thermal management systems | Handles vehicle driving vibration and thermal expansion/contraction to ensure the reliability of critical connections |
Rail Transit | Rail fasteners, carriage suspension systems, vehicle structure fastening | Withstands long-term alternating vibration and impact to prevent bolt loosening and detachment |
Construction Machinery | Excavator & crane structural connections, power equipment bolts | Adapts to heavy-load impact conditions to avoid bolt failure at critical parts |
Shipbuilding | Hull structure bolts, engine bases, pipe flange connections | Resists high-humidity, high-salinity marine corrosion and navigation vibration |
Electric Power Grid | Transmission tower bolts, substation equipment connections, generator set fastening | Copes with long-term outdoor wind vibration and temperature changes to reduce inspection and maintenance |
Construction & Bridges | Steel structure joints, large-scale bridge engineering fastening | Provides sustained preload for large heavy-load structures, coping with temperature changes and load fluctuations |
Aerospace | Aircraft engine & fuselage structural bolt connections | Withstands extreme temperature changes and high-intensity vibration to reduce safety risks of connection loosening |
Technical Parameter
Nominal specification | D (mm) | d (mm) | t (mm) | H (mm) | F (N) | (kg/ 1000piece) |
M2 | 5 | 2.2 | 0.40 | 0.60 | 630 | 0.05 |
M2.5 | 6 | 2.7 | 0.50 | 0.72 | 950 | 0.09 |
M3 | 7 | 3.2 | 0.60 | 0.85 | 1320 | 0.14 |
M3.5 | 8 | 3.7 | 0.80 | 1.06 | 2400 | 0.25 |
M4 | 9 | 4.3 | 1.00 | 1.30 | 3800 | 0.38 |
M5 | 11 | 5.3 | 1.20 | 1.55 | 5500 | 0.68 |
M6 | 14 | 6.4 | 1.50 | 2.00 | 8600 | 1.42 |
M7 | 17 | 7.4 | 1.75 | 2.30 | 11300 | 2.51 |
M8 | 18 | 8.4 | 2.00 | 2.60 | 14900 | 3.10 |
M10 | 23 | 10.5 | 2.50 | 3.20 | 22100 | 5.13 |
M12 | 29 | 13.0 | 3.00 | 3.95 | 3431 | 12.35 |
M14 | 35 | 15.0 | 3.50 | 4.65 | 41000 | 21.44 |
M16 | 39 | 17.0 | 4.00 | 5.25 | 59700 | 30.19 |
M18 | 42 | 19.0 | 4.50 | 5.80 | 74400 | 38.68 |
M20 | 45 | 21.0 | 5.00 | 6.40 | 93200 | 48.52 |
M22 | 49 | 23.0 | 5.50 | 7.05 | 114000 | 63.07 |
M24 | 56 | 25.0 | 6.00 | 7.75 | 131000 | 92.30 |
M27 | 60 | 28.0 | 6.50 | 8.35 | 154000 | 112.13 |
M30 | 70 | 31.0 | 7.00 | 9.20 | 172000 | 168.92 |
M33 | 76 | 34.0 | 7.50 | 10.00 | 226000 | 213.52 |
M36 | 83 | 37.2 | 8.00 | 10.50 | 276000 | 271.39 |
M42 | 96 | 43.5 | 8.50 | 12.00 | 290000 | 383.61 |
M48 | 110 | 49.5 | 9.00 | 12.50 | 261000 | 535.18 |
M56 | 128 | 58.0 | 9.50 | 13.50 | 260000 | 762.21 |
M64 | 136 | 66.0 | 10.00 | 14.00 | 287000 | 871.34 |
M72 | 145 | 74.0 | 10.50 | 15.00 | 327000 | 1006.84 |
M90 | 160 | 92.5 | 11.00 | 16.00 | 378000 | 1155.31 |
M100 | 180 | 102.5 | 11.50 | 17.00 | 370000 | 1551.52 |
M125 | 220 | 128.0 | 12.00 | 19.00 | 365000 | 2367.49 |
Materials available: 1074,51CrV4, 60Si2Mn, 65Mn, SUS302, SUS304, SUS316,17-7, Inconel 718, Inconel X-750, etc.; Surface treatments: phosphating, Dacromet plating, blue coating, polishing, Jumeite treatment, passivation, Teflon coating, etc. Custom non-standard dimensions and specifications can be provided upon request.
