Passivated Metal Stamping Parts SS External Tooth Lock Washer DIN6797 Type A
Passivated Metal Stamping Parts SS External Tooth Lock Washer DIN6797 Type A
Toothed lock washer stamping parts with a hole in the centre that can be put onto a screw or bolt for combination application , toothed lock washer type A is stamped with external teeth , and each tooth are not on level , they are placed with waving for increase friction .
External toothed lock washers are usually used with a combined screw or headed bolt to enhance secure purpose , the specifications are from 1.7 to 31 normally , customized sizes are available .
DIN 6797 type A
| Normal size | d1 | d2 | S1 | h |
| 1.7 | 1.7 | 3.6 | 0.3 | ≥2s1 |
| 2.2 | 2.2 | 4.5 | 0.3 | ≥2s1 |
| 2.7 | 2.7 | 5.5 | 0.4 | ≥2s1 |
| 3.2 | 3.2 | 6 | 0.4 | ≥2s1 |
| 3.7 | 3.7 | 7 | 0.5 | ≥2s1 |
| 4.3 | 4.3 | 8 | 0.5 | ≥2s1 |
| 5.3 | 5.3 | 10 | 0.6 | ≥2s1 |
| 6.4 | 6.4 | 11 | 0.7 | ≥2s1 |
| 7.4 | 7.4 | 12.5 | 0.8 | ≥2s1 |
| 8.4 | 8.4 | 15 | 0.8 | ≥2s1 |
| 10.5 | 10.5 | 18 | 0.9 | ≥2s1 |
| 13 | 13 | 20.5 | 1 | ≥2s1 |
| 15 | 15 | 24 | 1 | ≥2s1 |
| 17 | 17 | 26 | 1.2 | ≥2s1 |
| 19 | 19 | 30 | 1.4 | ≥2s1 |
| 21 | 21 | 33 | 1.4 | ≥2s1 |
| 23 | 23 | 36 | 1.5 | ≥2s1 |
| 25 | 25 | 38 | 1.5 | ≥2s1 |
| 28 | 28 | 44 | 1.6 | ≥2s1 |
| 31 | 31 | 48 | 1.6 | ≥2s1 |
Unit : mm
Material for external toothed lock washers either stainless steel nor carbon steel and sometimes , spring steel is also a choice .
SUS 304 toothed lock washer
Chemical elements
| C | Si | Mn | S | P | N | Cr | Ni |
| 0.07 | 0.06 | 2 | 0.025 | 0.04 | 0.1 | 19 | 10.5 |
Physical performance
| Tensile strength σb (MPa) | 535 |
| Yield Strength σs (MPa) | 210 |
| Elongation δ5 (%) | 50 |
| Reduction of area ψ (%) | 65 |
| Density g/cm3) | 7.93 |
Finish for external toothed lock washers
Zinc
The most popular plating for the most products , bright and smooth and resistant corrosion
Nickel
The film thickness is 1～3μm , it improves brightness and wear resistance . it is for the most items .
Polishing
Reduce roughness of parts and improve brightness . is workable for the most metal parts in industry .
Tin
With film thickness 0.13～1.27μm , tin finish with bright surface and good ductility ,corrosion resistance ,lower melting point ,eco-friendly features . and is used for electronics .
Brass
Usually, 5gm～8gm finish coating thickness and with good dispersibility ,Bright appearance .
Dacromet
This finish is grey color with High corrosion resistance , No hydrogen embrittlement ,Heat resistance ,Easy to plated more ,eco-friendly etc characteristics and the film thickness is 4-8μm ; Its used for Heavy-load truck ,engine ,Marine equipments etc
Chrome
Chrome finish is silver white color and the thickness of film is 0．25～0．5μm normally . chrome finish has many practical Features like Bright appearance ,Wear resistance ,Corrosion resistance ,Hard plating film ,Heat resistance .
Applications for external toothed lock washers
★ Car and Trucks
★ Air conditioner
★ Aerospace
★ Vessels
★ Bus
★ Telecommunication
★ Machines
★ Official devices
★ Electric items
Tips for operation
External toothed lock washers should be used combined with screws or bolts that with flat head so that lock washers can be touched fully it to increase friction .
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