A washer is a thin plate with a circular hole that’s typically used to evenly distribute the load of a threaded fastener. Before a threaded fastener is driven into a surface, a washer may be placed through the end for greater protection. This prevents the bolt head and nut from scuffing or indenting the surfaces of the two fastened parts, which could ultimately loosen the fastener.
Several different types of washers are available to suit different applications. For example, vibration-isolating washers are designed to absorb vibrations. These components are made of a soft material, such as plastic or urethane. Occasionally, metal washers are also used as spacers to increase the distance between the parts being fastened.
Below are some of the most recognized washers.
Flat washers: The function of flat washers is to increase the size of a screw’s bearing surface area, reducing the surface pressure applied on the fastened object. It is also known as Type A plain washers. They are good for general use.
Spring washers: Spring (or locking) washers are made by cutting out part of a flat washer so that it can form a twisted shape. As a result, a spring action or an elastic force operates. Unlike flat washers, which are placed on both the bolt and nut side, spring washers only go on the nut side of the fastener to establish a bond.
Belleville or Conical Washer: The Belleville washer consists of sides that support very heavy force with small deflections. It is also known as a conical spring washer. Conical washer load-deflection properties depend on its height and thickness rate. It is used for projects including thermal expansion.
Dome Spring Washer: The dome spring washers are similar to a Belleville washer but with rounded sides. Dome spring washers produce very high load capabilities with a comparatively small deflection range.
Lock Washer: This form of lock washer is used to lock the nuts and bolts. After fixing this washer its leaves are bent on the sides of the nut or bolt. Thus, this washer prevents the nut bolts from getting loose.
External Tooth washers: This type of lock washer has many teeth on its outer diameter that cut into a surface and maintain compression. The external tooth lock washer prevents a fastener head from loosening by using the strut action of the teeth. It is used to lock deep-headed fasteners into place.
Internal Tooth washers: This type of lock washer consists of many teeth on the inside diameter that cut into the nut or bolt. The internal tooth lock washer prevents a fastener head from loosening using the strut action of the teeth. These washer teeth can also absorb shock and vibration. It is used to lock shallow-headed fasteners into place.
Fender Washer: The fender washers are flat washers with a small hole and outside relatively large diameter. Hence this type of plain washer gives loads over a relatively larger area than flat washers. It is usually a thin metal. They have named it for their general use on car fenders.
Finishing or Countersunk Washer: The finishing washer has a top designed to hold the fastener. It is also known as a countersunk washer. The Countersunk washer has 90° or 120° counters at the top. These washers served as flat washers for flat head counters screws. This gives a flush surface to the countersunk screw.
At Precision metal we manufacture and stock washers of various types, grades and standards as well as custom designed.
Below is the list of washers we offer/supply:
|Flat Washers||Load Indicator washer|
|Lock Washers||Spring Washer|
|Structural Washers||Dome Spring washer|
|Square Washers||Taper Washer|
|Round Washers||Tab Washer|
|Backup Rivet Washers||Nylon washer|
|Belleville Conical Washers||Square Washers|
|Dock Washers||Washer for Clevis Pins|
|Fender Washers||Toothed Washers|
|Finishing countersunk Washers||Brass washers|
|Spherical Washer||PTFE washer|
|Bevel Washer||High Collar Lock washers|
|Internal tooth washers||External tooth washers|
Standards: ASTM/ ASME/ BS/ DIN/ JIS/ BS/ EN/ ISO
DIA RANGE: M3 TO M100 AND 1/8” TO 3” (Bigger size can be manufactured as per customer requirement)
- SELF COLOR
- BLACK OXIDIZING
- MECHANICAL GALVANIZED
- HOT DIP GALVANIZED
- ELECTRO ZINC PLATING
- ZINC DICHROMATE
- ZINC NICKEL
- ZINC YELLOW
- ELECTROLESS NICKEL PLATING
- ZINC BICHROMATE
- CERAMIC COATING
- TECTYL COATING
- TAKECOAT 1000
- MOYLKOTE COATING
- ZINC FLATE COATING
- PTFE XYLAN/XYLAR COATING
- DACROMET COATING
- AS PER CLIENT SPECIFICATIONS