Spherical washers are designed for creating a parallel plane between the bolt head and the face of the nut. Raptor Supplies offers spherical washers from Grainger. They are also known as levelling washers and are ideal for die & fixturing applications.
Features
The spherical design allows these washers to automatically adjust and compensate for the angular deviation between planes.
They minimise bolt fatigue from bending bolts.
These washers provide uniformly distributed bolt tension.
They are surface treated for protection against harsh & humid environments.
These washers feature improved bolt stretch owing to the increased clamping length.
They are offered in thicknesses ranging from 4.2 mm to 0.5 inches, at a maximum tolerance rating of +/-0.01 inches.
Buying Guide
Based On Finish
Black Oxide
Minimises light reflection and provides light-to-medium corrosion resistance
Plain
Provides wear resistance and protection from acids
Based On Material
Steel
Provides hardness, structural rigidity and durability
Stainless Steel
Corrosion, heat & fire-resistant properties with moderate structural rigidity
Low Carbon Steel
Provides structural rigidity and can be welded / machined easily
18-8 Stainless Steel
Offers chemical resistance and is mildly magnetic
Selection Factors
Rockwell Hardness
It indicates the resistance of the material to indentation / penetration.
Diameter
Users should select the washer based on the desired outside & inside ring diameters. The former decides the circumference or size of the washer whereas the latter sets the size of the fastener it would fit.
Thickness & Overall Height
These two factors decide the load bearing & shock absorbing capacity of the washer.
Frequently Asked Questions
How much angular deviation can spherical washers compensate?
All-spherical, two-piece washers automatically adjust under compression for compensating angular deviations up to 4 degrees.
What is the significance of male and female components in a spherical washer?
When the male and female components nest, they swivel slightly to compensate for uneven surfaces & tolerance variations.
What is the advantage of compensating angular deviations?
Compensation of angular deviations creates a parallel plane between the inner face of the nut and the inner face of the bolt head. This allows uniform distribution of load over the complete inner contact surface area.
What is the nature of tolerance of the concave and convex components of these spherical washers?
The concave component has a positive tolerance while the convex part has a negative tolerance.