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 .
