ASTM B362-91(2008)
(Test Method)Standard Test Method for Mechanical Torque Rate of Spiral Coils of Thermostat Metal
Standard Test Method for Mechanical Torque Rate of Spiral Coils of Thermostat Metal
SIGNIFICANCE AND USE
This test method is useful to determine the mechanical force of spiral coils of thermostat metal.
The mechanical properties of a coil may vary from lot to lot of thermostat metal material. This method is useful for determining the optimum thickness and length of the material for a given mechanical torque specification.
This test is useful as a quality test to determine acceptance or rejection of a lot of thermostat metal coils.
SCOPE
1.1 The test method covers the principles of determining the mechanical torque rate of spiral coils of thermostat metal.
Note 1—This test method has been developed particularly to cover the determination of the mechanical torque rate of spiral coils made of thermostat metal for carburetors and manifold heat controls. The method is not limited to thermostat metals and can be used for spiral coils of other materials for which the torque rate must be measured accurately.
1.2 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate.
1.3 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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
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Designation: B362 − 91(Reapproved 2008)
Standard Test Method for
Mechanical Torque Rate of Spiral Coils of Thermostat Metal
This standard is issued under the fixed designation B362; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope several methods for obtaining this value, it is preferred that the
outer end of the spiral coil be held stationary, but not fixed, and
1.1 The test method covers the principles of determining the
the inner end of the coil be rotated after applying a load to the
mechanical torque rate of spiral coils of thermostat metal.
outer end of the coil at a fixed radius.
NOTE 1—This test method has been developed particularly to cover the
determination of the mechanical torque rate of spiral coils made of
4. Significance and Use
thermostat metal for carburetors and manifold heat controls. The method
is not limited to thermostat metals and can be used for spiral coils of other 4.1 This test method is useful to determine the mechanical
materials for which the torque rate must be measured accurately.
force of spiral coils of thermostat metal.
1.2 The values stated in inch-pound units are to be regarded
4.2 The mechanical properties of a coil may vary from lot to
as the standard. The metric equivalents of inch-pound units
lot of thermostat metal material. This method is useful for
may be approximate.
determining the optimum thickness and length of the material
1.3 This standard does not purport to address all of the
for a given mechanical torque specification.
safety concerns, if any, associated with its use. It is the
4.3 This test is useful as a quality test to determine accep-
responsibility of the user of this standard to become familiar
tance or rejection of a lot of thermostat metal coils.
with all hazards including those identified in the appropriate
Material Safety Data Sheet (MSDS) for this product/material
5. Apparatus
as provided by the manufacturer, to establish appropriate
5.1 The determination of the mechanical torque rate of
safety and health practices, and determine the applicability of
spiral coils is subject to many variables and is sensitive to the
regulatory limitations prior to use.
degree that even different apparatus employing the same test
principles will give different results. Therefore it is recom-
2. Terminology
mended that the apparatus be standardized. The apparatus
2.1 thermostat metal, n—a composite material, usually in
shown in Fig. 1 and Fig. 2 and consisting essentially of the
the form of sheet or strip, comprising two or more materials of
following components, has been found satisfactory:
any appropriate nature, metallic or otherwise, that, by virtue of
5.1.1 Specimen Holder—A specimen holder shall provide
the differing expansivities of the components, tends to alter its
for securely holding the inner end of the test specimen.
curvature when its temperature is changed.
Preferably, the holder or mounting arbor shall be of circular
2.2 mechanical torque rate, n—the ratio of torque to deflec-
cross section whose diameter is as large as possible without
tion. It is a measure of the stiffness of the coil and may have the
touching the inner turn of the coil under any test conditions of
units of ounce inch or gram centimetre per angular degree.
load. The end of the arbor shall be slotted entirely across its
2.3 spiral coil, n—a part made by winding strip on itself.
diameter, to a depth greater than the width of the specimen, and
of a width slightly narrower than the thickness of the specimen.
3. Summary of Test Method
Thus, the inner tab will be a push or snug fit in the slot for its
entire width. The edges of the slot shall be sharp where it
3.1 The test for mechanical torque rate of spiral coils
intersects the circumference of the arbor. The slot shall be so
consists of applying a torque, or moment of force, that will not
positioned in the arbor that the center of rotation of the arbor
stress the material in excess of its elastic limits, to the coil and
and the coil will coincide.
measuring the resulting deflection as angular rotation. Of the
5.1.2 Protractor—The angular deflection due to the test
torque shall be measured by a protractor with a minimum
division of 0.5 angular degrees.
This test method is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
5.1.3 Loading Pin—The loading pin is the member by
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
means of which the load is applied to the outer end of the coil.
Current edition approved April 1, 2008. Published April 2008. Originally
The pin shall be preferably of circular cross section approxi-
approved in 1960. Last previous edition approved in 2003 as B362 – 91 (2003).
DOI: 10.1520/B0362-91R08. mately ⁄32 in. (2.4 mm) in diame
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This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:B362–91(Reapproved2003) Designation: B 362 – 91 (Reapproved 2008)
Standard Test Method for
Mechanical Torque Rate of Spiral Coils of Thermostat Metal
This standard is issued under the fixed designation B 362; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of 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. Scope
1.1 The test method covers the principles of determining the mechanical torque rate of spiral coils of thermostat metal.
NOTE 1—This test method has been developed particularly to cover the determination of the mechanical torque rate of spiral coils made of thermostat
metal for carburetors and manifold heat controls. The method is not limited to thermostat metals and can be used for spiral coils of other materials for
which the torque rate must be measured accurately.
1.2 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may
be approximate.
1.3 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 become familiar with all hazards including those identified in the appropriate Material Safety Data
Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and
determine the applicability of regulatory limitations prior to use.
2. Terminology
2.1 thermostat metal, n—a composite material, usually in the form of sheet or strip, comprising two or more materials of any
appropriate nature, metallic or otherwise, that, by virtue of the differing expansivities of the components, tends to alter its curvature
when its temperature is changed.
2.2 mechanical torque rate, n—the ratio of torque to deflection. It is a measure of the stiffness of the coil and may have the units
of ounce inch or gram centimetre per angular degree.
2.3 spiral coil, n—a part made by winding strip on itself.
3. Summary of Test Method
3.1 The test for mechanical torque rate of spiral coils consists of applying a torque, or moment of force, that will not stress the
material in excess of its elastic limits, to the coil and measuring the resulting deflection as angular rotation. Of the several methods
for obtaining this value, it is preferred that the outer end of the spiral coil be held stationary, but not fixed, and the inner end of
the coil be rotated after applying a load to the outer end of the coil at a fixed radius.
4. Significance and Use
4.1 This test method is useful to determine the mechanical force of spiral coils of thermostat metal.
4.2 The mechanical properties of a coil may vary from lot to lot of thermostat metal material. This method is useful for
determining the optimum thickness and length of the material for a given mechanical torque specification.
4.3 This test is useful as a quality test to determine acceptance or rejection of a lot of thermostat metal coils.
5. Apparatus
5.1 The determination of the mechanical torque rate of spiral coils is subject to many variables and is sensitive to the degree
that even different apparatus employing the same test principles will give different results. Therefore it is recommended that the
apparatus be standardized. The apparatus shown in Fig. 1 and Fig. 2 and consisting essentially of the following components, has
been found satisfactory:
5.1.1 Specimen Holder—A specimen holder shall provide for securely holding the inner end of the test specimen. Preferably,
the holder or mounting arbor shall be of circular cross section whose diameter is as large as possible without touching the inner
turn of the coil under any test conditions of load.The end of the arbor shall be slotted entirely across its diameter, to a depth greater
than the width of the specimen, and of a width slightly narrower than the thickness of the specimen. Thus, the inner tab will be
This test method is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.10 on
Thermostat Metals and Electrical Resistance Heating Materials.
e1
Current edition approved June 10, 2003. Published July 2003. Originally approved in 1960. Last previous edition approved in 1991 as B362–91(1997) .
Current edition approved April 1, 2008. Published April 2008. Originally approved in 1960. Last previous edition approved in 2003 as B 362 – 91 (2003).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 362 – 91 (2008)
FIG. 1 Schematic Design of Apparatus
FIG. 2 Typical Design of Apparatus
a push or snug fit in the slot for its entire width. The edges of the slot sha
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