Locking Washers

These are used for locking a device and reducing the vibration. They reduce loosening by preventing unscrewing rotation of the fastening device; locking washers are usually also spring washers.

Washers are available in a wide range such as spring washers, star washers, multi-tooth washers, disc spring washers, wave washers, taper washers, safety washers etc.


Spring Washers Type A Square Product Code: B4D05 

A Spring washer is a metal ring split at one point and bent into a helical shape. This helps the washer to exert a spring force between the fastener’s head and the surface. This keeps the washer firm against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.

A spring washer square has square ends at the split end. Provides much better resistance as compared to a plain washer.

Material SS04


Spring Washers Type B Flat/ Split Lock Washers 

DIN 127B Product Code:B4D06 

The lock washer prevents nuts and bolts from turning, slipping and coming loose because of vibration and torque. The washer has sharp edges that dig into the nut as well as mounting surface in order to prevent rotation in the counter clockwise direction. 
Spring Lock Washers are of many types, most common one being the helical split washer. A ring split at one point and bent into a helical shape. This causes the washer to exert a spring force between the fastener’s head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.  
Materials: Spring Steel, SS AISI 301 and AISI 316

Standards: IS 3063, DIN 127B
Size Range: M2 to M48


Star Washers Internal Product Code: B4D11  

These are locking washers that form part of the serrated or toothed type of washers. They feature serrations or teeth that extend radially inward to bite into the bearing surface.
Their effectiveness is more evident on soft substrates such as plastics or Aluminium although they do resist rotation better than plain washers on harder surfaces. As per DIN 6797A

​​Materials
– Spring Steel
– SS AISI 304
– SS AISI 316. Available on request.


Star Washers External Product Code: B4D12 

 

Materials
– Spring Steel
– SS AISI 304
– SS AISI 316. Available on request.


Multi Tooth Washers External Product Code: B4D13 

​​Materials
– Spring Steel
– Stainless Steel AISI 304
– Stainless Steel AISI 316. Available on request.

Multi Tooth Washers Internal   Product Code: B4D14 

The multi tooth lock washer works best with smaller screws heads. It is useful where a good grip is required but the teeth should not be visible as they affect the appearance of the product. The internal teeth grip the screw head and are useful in preventing a backward motion.

​​Materials
– Spring Steel
– Stainless Steel AISI 304
– Stainless Steel AISI 316. Available on request.


Conical Spring Washers DIN 6796 Product Code: B4D20 

A Conical spring washer designed to help prevent loosening of bolted joints under vibration. This type, manufactured to DIN 6796 has an inherent conical shape. It is also known as a Belleville washer, disc spring, coned-disc spring and cupped disc washer.

 

Serrated Safety Washers Type S – Schnorr Type  

The Safety Washers are of trapezoidal cross section and serrated on both sides. The security is achieved through friction and mechanical locking.
Advantages
– The cross section ensures locking effect at the outside diameter.
– Due to the closed ring form, high degree of pretensioning is achieved.
– Sliding surfaces allow tightening with damaging the mating surfaces.
– High resistance to vibration due to positive locking of the serrations
– Suitable for a wide range of screw/bolt heads minimizing stocks.

Afnor Contact Lock Washers – NF E-25 511 

Contact Washers are Conical shaped Lock Washers formed with a ribbed top surface. The conical shape exerts locking force 360 degree around the underside of the screw head/ nut by generating tension. The ribbed top surface further enhances the locking force and resists the torqued fastener connection potential for loosening under pressure and vibration. This is a single-sided toothed and non-slip locking washer, providing the designer the ability to secure wobble-prone screw effectively. It is particularly suitable for use on slot fasteners, dynamic cross-loaded to the screw connections and applications that require high biasing forces.

These washers are widely used in locomotives, appliances, elevators, electrical towers, medical machinery and electronic equipment.

Range available: Sizes – M3 to M20

Materials SS-304 / SS-316. As per NFE – 25511

 

Disc Spring Washers – DIN 2093 

Known by many different names, this washer is a type of spring shaped like a washer. Disc Washers are loaded in the axial direction, either dynamically or statically. They offer well-developed solutions to many engineering problems. Through a unique combination of high force in a small space, the disc can be used single or arranged in stacks.