ASTM F939-05a

Standard Practice for Selection of Release Torque Values for Alpine Ski Bindings

SCOPE
1.1 This practice provides procedures for the selection of release torque values for Alpine ski/boot/bindings systems. These procedures may be used by ski binding manufacturers in their instructions for installation and use and by ski shops for the adjustment of already mounted ski bindings.
1.2 This practice is applicable to releasable Alpine ski/boot/binding systems.
1.3 Release torque values selected using this practice may not be appropriate for circumstances in which:
1.3.1 The skier carries an object that significantly increases the skier's effective body weight,
1.3.2 The skier grasps or in some manner controls an object such as a sled, or
1.3.3 The skier encounters exceptional snow or terrain conditions not commonly found on developed ski slopes.
1.4 This practice may be inappropriate for nonmechanical bindings or bindings used with boots that reach more than half way up the lower leg.
1.5 Release torque values outside the recommendations of this practice may increase the risk of injury to the skier. However, skiers who are informed of this potential risk may request such settings and have them provided, subject to any guidelines and limitations specified by the binding manufacturer.
1.6 These values refer to recommended release torque for initial adjustment of a ski binding and subsequent readjustment of the binding during routine maintenance or following a suspected malfunction. However, these values are not intended to apply to the condition of the equipment at any time after it is put into use.
1.6.1 For information concerning applicable tolerances to be used for the adjustment and inspection of releasable Alpine ski bindings in retail operations consult Practice F 1063; for rental applications consult Practice F 1064 .
1.7 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.

General Information

• Status: Historical
• Publication Date: 31-Jul-2005
• ICS: 97.220.20 - Winter sports equipment
• Technical Committee: F27 - Snow and Water Sports
• Drafting Committee: F27.10 - Binding Test Procedures

Relations

• Replaces: ASTM F939-05 - Standard Practice for Selection of Release Torque Values for Alpine Ski Bindings
• Effective Date: 01-Aug-2005
• Replaced By: ASTM F939-06 - Standard Practice for Selection of Release Torque Values for Alpine Ski Bindings
• Effective Date: 01-Aug-2006
• Referred By: ASTM F1061-08(2020) - Standard Specification for Ski Binding Test Devices
• Effective Date: 01-Aug-2005
• Referred By: ASTM F1064-21 - Standard Practice for Sampling and Inspection of Complete and Incomplete Alpine Ski/Binding/Boot Systems in Rental Applications
• Effective Date: 01-Aug-2005
• Referred By: ASTM F1063-22 - Standard Practice for Functional Inspections and Adjustments of Alpine Ski/Binding/Boot Systems
• Effective Date: 01-Aug-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F939–05a
Standard Practice for
1
Selection of Release Torque Values for Alpine Ski Bindings
This standard is issued under the fixed designation F939; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Adheringtotheseguidelinesmayhelptoreducetheriskofinjuriesresultingfromimproperrelease
torque selection. However, skiing involves inherent risks. Injury can result from simply falling down,
impact with another object, or from many other actions. Many injuries are unrelated to binding
release/retention characteristics. Furthermore, even a properly adjusted binding cannot release under
all injury-producing loads or retain at all times when retention is desired.Therefore, it is to be clearly
understood that compliance with these guidelines in no way guarantees that injury can be prevented.
1. Scope suspectedmalfunction.However,thesevaluesarenotintended
to apply to the condition of the equipment at any time after it
1.1 This practice provides procedures for the selection of
is put into use.
release torque values for Alpine ski/boot/bindings systems.
1.6.1 For information concerning applicable tolerances to
Theseproceduresmaybeusedbyskibindingmanufacturersin
be used for the adjustment and inspection of releasableAlpine
their instructions for installation and use and by ski shops for
ski bindings in retail operations consult Practice F1063; for
the adjustment of already mounted ski bindings.
rental applications consult Practice F1064.
1.2 ThispracticeisapplicabletoreleasableAlpineski/boot/
1.7 This standard does not purport to address all of the
binding systems.
safety concerns, if any, associated with its use. It is the
1.3 Release torque values selected using this practice may
responsibility of the user of this standard to establish appro-
not be appropriate for circumstances in which:
priate safety and health practices and determine the applica-
1.3.1 The skier carries an object that significantly increases
bility of regulatory limitations prior to use.
the skier’s effective body weight,
1.3.2 Theskiergraspsorinsomemannercontrolsanobject
2. Referenced Documents
such as a sled, or
2
2.1 ASTM Standards:
1.3.3 The skier encounters exceptional snow or terrain
F504 Test Method for Measuring the Quasi-Static Release
conditions not commonly found on developed ski slopes.
Moments of Alpine Ski Bindings
1.4 This practice may be inappropriate for non-mechanical
F1061 Specification for Ski Binding Test Devices
bindings or bindings used with boots that reach more than half
F1063 PracticeforFunctionalInspectionsandAdjustments
way up the lower leg.
of Alpine Ski/Binding/Boot Systems
1.5 Release torque values outside the recommendations of
F1064 Practice for Sampling and Inspection of Complete
this practice may increase the risk of injury to the skier.
and Incomplete Alpine Ski/Binding/Boot Systems in
However, skiers who are informed of this potential risk may
Rental Applications
request such settings and have them provided, subject to any
3
2.2 ISO Standard:
guidelines and limitations specified by the binding manufac-
8061 Method for the Selection of Release Torque Values
turer.
1.6 These values refer to recommended release torque for
3. Terminology
initialadjustmentofaskibindingandsubsequentreadjustment
3.1 Definitions:
of the binding during routine maintenance or following a
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This practice is under the jurisdiction of ASTM Committee F27 on Snow contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Skiing and is the direct responsibility of Subcommittee F27.10 on Binding Test Standards volume information, refer to the standard’s Document Summary page on
Procedures. the ASTM website.
3
Current edition approved Aug. 1, 2005. Published August 2005. Originally Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
approved in 1985. Last previous edition approved in 2005 as F939–05. 4th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F939–05a
M 50.69 m 115 (2)
3.1.1 release/retention settings—release torque of the ski/
z s
boot/binding system in twist (M ) and forward lean (M)as
z y
where:
defined in Test Method F504.
m = the mass of the skier in kg.
s
3.1.2 skier type—classification selected by the skier for the
type of skiing to be undertaken.
5.1.2 Lower Value for Twist, M , in N-m is determined by
z
3.1.2.1 I—designation that provides low
...