Page 20 - SELECTA • FASTENERS PLUS... CATALOG
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Washers s Mechanical & Performance Requirements
FASTENERS
External Tooth
Description A hardened circular washer with twisted prongs or “teeth” which
extend out from the outer edge of the washer.
Applications/ This is the most preferable of all tooth-lock washers. It offers the
Advantages greatest locking efficiency since the teeth are on the largest radius
and provide greater torsional resistance.
Internal Tooth
Description A hardened circular washer with twisted prongs or “teeth” which extend
inward from the inside edge of the washer.
Applications/ This is preferred when finished appearance is crucial and the teeth must be
Advantages hidden under the head of the screw; also recommended for use with small
heads such as fillisters.
Regular & High-Alloy Split
Description 2EGULAR A coiled, hardened, split washer with a slightly trapezoidal wire
section.
(IGH !LLOY Dimensionally identical to a regular split lock washer but made
from 4037 alloy steel.
3TAINLESS A regular split lock washer made from austenitic stainless steel.
USS Flat
Description A thin, flat, circular steel part with a centrally located hole.
Applications/ Washers are designed for assembly around a bolt or screw, between the bearing
Advantages surface of the fastener and the part to which it is attached. Flat washers are
USED TO IMPROVE STRESS DISTRIBUTION AND TO SPAN LARGE CLEARANCE HOLES 533
washers are designed to meet the majority of industrial applications in manu-
facturing, maintenance and repair.
SAE Flat
Description 3IMILAR TO A 533 WASHER BUT WITH SLIGHTLY SMALLER INSIDE AND OUTSIDE DIAMETERS
!LSO MOST BUT NOT ALL 3!% WASHERS ARE MADE FROM THINNER MATERIALS THAN 533
washers.
Applications/ 3!% WASHERS WERE DESIGNED TO SERVE SIMILAR PURPOSES AS THE 533 WASHERS BUT
Advantages specifically to meet the requirements in the field of automotive engineering.
C-4 SELECTA PRODUCTS, INC. s Tehachapi, CA s Memphis, TN s 800-722-6445 s 800-433-4319 FAX s www.selectainc.com s orders@selectainc.com
