ISO 2320-2015 pdf free.Fasteners一Prevailling torque steel nuts – Functional properties.
ISO 2320 specifies the functional properties for prevailing torque steel nuts when tested at an ambient temperature range of +10 °C to +35 °C. It includes a combined test method to determine the prevailing torque properties and the torque/clamp force properties at the same time.
It applies to prevailing torque all metal type nuts and prevailing torque non-metallic insert type nuts:
— with triangular ISO thread in accordance with ISO 68-1;
— with diameter/pitch combination in accordance with ISO 261 and ISO 262;
— with coarse pitch thread M5 to M39 or with fine pitch thread M8 x ito M39 x 3;
— with thread tolerances in accordance with ISO 965-2;
— with mechanical properties in accordance with ISO 898-2;
Prevailing torque values specified in this standard are based on laboratory test conditions.
NOTE I Actual prevailing torques in practical application can vary.
NOTE 2 All metal type nuts conforming to the requirements of this International Standard are used in applications ranging from -50°C to +150 °C.
NOTE 3 Non-metallic insert type nuts conforming to the requirements of this International Standard are used In applications ranging from -50 °C to +120 °C.
WARNING — Temperatures outside the ambient temperature range can influence the functional I)roperties (torque/clamp force and prevailing torque properties), see AnjiexA.
2 Normative references
The following referenced documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 273, Fasteners — Clearance holes for bolts and screws
ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread
ISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2: Nuts with specified property classes — Coarse thread and fine pitch thread
ISO 965-2. Iso general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general purpose external and internal screw threads — Medium quality
ISO 16047:2005, Fasteners — Torque/clamp force testing.ISO 2320 pdf free download.
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