Washers

Washers

WASHERS are disks of rubber placed beneath a nut, an axle bearing, or a joint, to relieve friction, prevents leakage, isolate, prevent loosening or distribute pressure. There are many different types of washers and washer type products for a variety of applications. Common types include Flat Washers, Beveled, C-Washers, D-shaped Washers, Sealing Washers, Spherical Washers, Square Washers & Shoulder Washers. Flat Washers are thin, flat, and circular general-purpose washers, with a centrally located hole.

Washers can be specified in ANSI nominal sizes or ANSI metric sizes. Important size dimensions to consider when specifying washers include Inside Diameter, Outside Diameter, Thickness or working Height, and rated or working load. Materials of construction include Aflas®, FKM or VITON, SILICON, EPDM, NBR, NEOPRENE, PTFE, PU, SBR & NATURAL. The hardness rating on a Shore A scale for Washers can be 30 ~ 95 Durometer. Exact specifications should be clarified by our engineers, as chemical and physical properties of Washers can differ based on manufacturing technique.

Material Selection Guide

MATERIAL NR SBR NBR CR EPDM HNBR ACM CSM SILICONE FKM
(VITON)
HARDNESS RANGE ( SHORE A) 40-90 35-90 40-90 40-80 40-90 40-90 40-80 40-80 30-80 50-90
HIGH TEMP◦C 100 120 130 130 150 150 180 150 230 225
LOW TEMP◦C -50 -55 -45 -40 -50 -45 -25 -40 -60 -15
STEAM F F F P G G P E E E

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E= EXCELLENT;  G= GOOD;  F= Fair; P= Poor; A=Available, NA= Not Available

This guide is intended for general  reference Only. The materials listed are the most commonly used. There are numerous compound variations  designed  for  specific  applications  for  which  please  forward  details  to our  engineers  for  recommendation.

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