Standard:DIN9250（Domestic equivalent JB/ZQ4340），分 S"Lightweight"/ VSHeavy duty Two series
⚠️Distinguishing point: Many customers will mix DIN9250 double-sided toothed disc pad and DIN25201 wedge-shaped double layered pad as "double-sided teeth"，The principles are completely different
✅ structural principle
Single conical discBoth the upper and lower surfaces are equipped with radial knurled teeth. After being tightened, the disc is compressed to generate a continuous disc-shaped elastic force Double sided teeth simultaneously bite the nut end face and the workpiece surface；Relying on Disc elasticity and double-sided friction bite to achieve anti loosening。
· DIN9250:Single-piece use，Double sided full tooth, conical disc spring+Friction anti-slip
· DIN25201:Two pieces in a group，Inner wedge-shaped inclined surface, outer single-sided radiating teeth, wedge-shaped self-locking principle
✅Material&Heat Treatment
1. 65Mn / S60CSpring steel (mainstreamQuenching and temperingHV400~480; Adaptation8.8,10.9,12.9High strength bolts; Surface: Blackened, galvanized, Dacromet (wind/outdoor)
2. SUS304 / SUS316LStainless steelFor anti-corrosion conditions, with relatively low hardness, it is suitable for medium and low loads
3. Optional heavy load60Si2MnA,50CrVA
✅ specification
SLightweightm1.6-m7~M42 VSHeavy dutyM5~M30，Same thread specification ratio SThicker and with greater load-bearing capacity
✅ Core features
· Double sided radiating teeth, both sides can bite, installation No distinction between positive and negative sidesSimple assembly
· Disc spring continuously compensates for pre tension force, resisting vibration, creep, thermal expansion and contraction
· ComparedNFE25-511(With only single-sided teeth), the two-sided meshing provides stronger anti-slip performance
· ⚠ ️Teeth may crush soft substrates such as aluminum and plastic. Use soft connections with caution
· ❗Weak point Pure friction anti loosening,JunkerThe performance of strong alternating vibration is weaker thanDIN25201Wedge-shaped self-locking washer
✅Application scenarios
Automotive chassis, motors, fans, gearboxes, rail transit, general engineering machinery, electrical equipment; Moderate vibration condition, suitable for scenarios where it is not desirable to install two gaskets in pairs and where assembly space is limited.
✅ Installation points
1. Single piece for independent useNo need to be in pairs; Both sides are toothed and have no front or back
2. Matching bolts8.8 or higher"Best grade"
3. Do not stack too many gaskets to avoid flattening the disc and losing its elasticity
