Flat Washer Availability
The flat washers listed in this catalog represent only
a small portion of the many that are available. The WCL
inventory contains over 7000 different sizes, in different
materials, etc. All of these cannot be listed here because
of space limitations. Source tooling is available for
many others not shown. Pages 29 & 30 in our pdf catalog show some of
the more commonly used specials that are available, cross-referenced
to appropriate ordnance numbers.
Quality Assurance
WCL has a Quality Assurance Department and Program to
confirm the integrity of all the products it sells. We
represent only those manufacturers that have an outstanding
reputation for consistently providing high quality parts,
and we maintain complete procurement data and certifications
from our suppliers and processors on pertinent Stock
Reference items.
Specifications, Testing and Certifications
A detailed explanation of the test requirements called
for under the various military specifications and a listing
of the many certifications available through WCL, appear
on pages 8 (
html ) and 9 ( pdf ). WCL can be an indispensable
source for parts conforming to all MIL-SPEC requirements.
If parts are not tested to MIL-SPEC requirements, they
are not MIL-SPEC parts. If parts are not plated to MIL-SPEC
requirements, they are not MIL-SPEC parts.
Nominal Dimensions
Nominal dimensions are provided on all flat washers
and are so identified. They are provided for reference
only. Parts are produced to standard commercial tolerance
and are appropriate for all commercial applications.
With regards to thickness dimensions indicated, parts
conform to stamping industry standards.
WCL frequently stocks popular washer sizes in more than
one thickness and this is indicated in the charts. For
specific tolerances and thicknesses on other referenced
parts, please contact WCL. Parts with special tolerances
and thicknesses can be provided as specified.
Inside Diameter Profile
The inside diameter of a conventional flat washer traditionally
has three distinct profiles as a result of the punch
press process. As the punch enters, there is some pushing
in of the material which results in a rounded corner
section.
(A). Then, as the punch advances, it creates a substantially
parallel section until it approaches the exit point and
a tapered breakout occurs.
(B). Dimensions given for inside diameters, and their
accepted tolerances, apply to the parallel sections.
At the break out side of the washer, the specified maximum
inside diameter may be exceeded by a maximum of 25%
of the specified thickness (See figure 1 in the pdf file ).
Materials and Plating
The charts on the following pages show the availability
of washers in the more popular materials. Many of these
washers are available in other non-ferrous materials
and non-metallics. In the appropriate materials availability
columns, standard dash reference numbers are used for
AN, MS and NAS parts as well as for some commercial parts
to indicate the availability of these parts in the designated
materials and finishes. For commercial parts, an “X” designation
is used. (See figure 2 in the pdf file ).
Metric Washers
The many metric flat washers available from WCL are
designated with an (M-) prefix for the metric screw or
bolt size in the “Size” column. Metric washers
are available in either DIN or ANSI/ASME B18.22M specifications
and the relevant specification is indicated in the particular “Reference”column.
Material thicknesses on metric parts generally conform
to conventional U.S.washer manufacturing tolerances unless
the parts have been stamped from material produced to
metric thickness.
View, download, or print the PDF file
which contains the specifications: Flat Washer Reference Specifications |
WCL
stocks one of the nation’s most comprehensive lines
of plastic fasteners and components. These are reliable,
high-performance plastic products from the nation’s
leading manufacturers. With our state-of-the-art information
retrieval system, we can immediately tell you, not only
if we have the part you require, but everything else
in stock that’s similar to what you need. We know
the advantages and limitations of commercially used plastics
and plastic compounds. We can assist in developing an
application-specific, cost-effective part matched to
your exact requirements. For the right fastener
at the right price, it’s WCL.