Standard Test Method for
Resistance to Unsnapping of Snap Fasteners1
This standard is issued under the fixed designation D 4846; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1.1 This test method covers the determination of the force
required to disengage snap fasteners by a pull perpendicular to
and parallel with the plane of the snap fastener.
1.2 This test method requires the attachment of snaps to specimens using specifications provided by the producers of the
1.3 This test method is used to establish a correlation to wear
conditions and for comparing different brands and types of
1.4 The values stated in SI units are to be regarded as the
standard. The values stated in the parentheses are for information only.
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards: 2
D 76 Specification for Tensile Testing Machines for Textiles
D 123 Terminology Relating to Textiles
D 1776 Practice for Conditioning Textiles for Testing
3.1 lateral holding strength, n—the force required to disengage a snap fastener resulting from a pull in the plane parallel
to the material to which the snap fastener is attached.
3.2 snap action, n—the force required to disengage a snap
fastener resulting from a pull exerted perpendicular to the plane
of material to which the snap fastener is attached.
3.3 snap fastener, n—a device for attaching one material to
another consisting of matching male and female parts, each of
which is attached to a separate material so that the parts can be
Click below to download Astm D 4846 – 96 (Reapproved 2004) pdf free
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