This part of ISO 898 specifies mechanical and physical
properties of bolts, screws and studs made of carbon steel and
alloy steel when tested at an ambient temperature range of 10 °C to
35 °C. Fasteners (the term used when bolts, screws and studs are
considered all together) that conform to the requirements of this
part of ISO 898 are evaluated at that ambient temperature range.
They might not retain the specified mechanical and physical
properties at elevated temperatures (see Annex B) and/or lower
NOTE 1 Fasteners conforming to the requirements of this part of
ISO 898 are used in applications ranging from −50 °C to +150 °C.
Users are advised to consult an experienced fastener metallurgist
for temperatures outside the range of −50 °C to +150 °C and up to a
maximum temperature of +300 °C when determining appropriate choices
for a given application.
NOTE 2 Information for the selection and application of steels
for use at lower and elevated temperatures is given, for example,
in EN 10269, ASTM F2281 and in ASTM A320/A320M.
Certain bolts and screws might not fulfil the tensile or
torsional requirements of this part of ISO 898 because the geometry
of their heads reduces the shear area in the head compared to the
stress area in the thread. These include bolts and screws having a
low or countersunk head.
This part of ISO 898 is applicable to bolts, screws and
— made of carbon steel or alloy steel,
— having triangular ISO metric screw thread in accordance with
— with coarse pitch thread M1,6 to M39, and fine pitch thread
M8×1 to M39×3,
— with diameter/pitch combinations in accordance with ISO 261
and ISO 262, and
— having thread tolerances in accordance with ISO 965-1, ISO
965-2 and ISO 965-4. It is not applicable to set screws and similar
threaded fasteners not under tensile stress (see ISO 898-5). It
does not specify requirements for such properties as
— corrosion resistance,
— resistance to shear stress,
— torque/clamp force performance (for test method, see ISO
— fatigue resistance.
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