Plain Washers
A plain washer is a thin plate, which is most commonly has a disk-shape with a hole in middle. It is widely used to distribute the load of a threaded fastener.
Plain washers are used to provide a larger bearing surface where screws, bolts and nuts come in contact with the bearing surfaces.
NOMENCLATURE
d1 Inside diameter
d2 Outside diameter
s Thickness.
There is a large range available to suit every application.
The normal series is available as per the following standards
DIN 125
ISO 7089
IS 2016
Smaller OD washers for Machine Screws are available as per the following standards.
DIN 433
IS 2016
ISO 7092
Larger OD washers are used for irregular holes, softer materials and larger holes. They are sometimes referred to as “Fender Washers” and distribute the load over a larger area making them useful for materials such as wood and plastics.
These are available as per the following standards
DIN 9021
IS 2016
ISO 7093
Special dimensions are also available under our Penny Washer Series and we have a range of SHIM washers as per DIN 988.
We ensure that every batch confirms correctly to the relevant standard and material grade.
They are available in the following materials.
Mild Steel – Natural Finish, Zinc Plated and Nickel Plated.
Stainless Steel – AISI 304 and AISI 316
Titanium – Grade 2
NYLON
Plain Washer Hardness
Class 100 HV : Minimum HV 140 (Rockwell B 56.2 minimum). Suitable for hexagon bolts and screws of product grade C in property classes up to and including 6.8; hexagon nuts of product grade C in property classes up to and including 6; case-hardened thread rolling screws
Class 140 HV : Minimum HV 140 (Rockwell B 75 minimum). Useful for majority of industrial applications including stainless steel assemblies.
Class 200 HV : Minimum HV 200 (Rockwell B 91.5 – C 29.8). Useful for higher demands in manufacturing, maintenance and repair.
Class 300 HV : Minimum HV 300 (Rockwell C 29.8- 40.8). Hardened and tempered. Best suited for use with through hardened screws, bolts and nuts.