GB/T 3098.9-2020 Mechanical properties of fasteners—Prevailing torque type steel nuts English
Mechanical Properties of Fasteners — Prevailing Torque Type Steel Nuts
1 Scope
This part of GB/T 3098 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.
This part is applicable to prevailing torque all metal type nuts and prevailing torque non-metallic insert type nuts:
— with general purpose metric screw threads in accordance with GB/T 192;
— with diameter/pitch combination in accordance with GB/T 193 and GB/T 9144;
— with coarse pitch thread M5 to M39 or with fine pitch thread of nominal diameter d = 8 mm to 39 mm;
— with thread tolerances in accordance with GB/T 9145;
— with mechanical properties in accordance with GB/T 3098.2.
Prevailing torque values specified in this part are based on laboratory test conditions.
Note 1: Actual prevailing torques in practical application can vary.
Note 2: All metal type nuts conforming to the requirements of this part are used in applications ranging from -50°C to +150°C.
Note 3: Non-metallic insert type nuts conforming to the requirements of this part are used in applications ranging from -50°C to +120°C.
Warning: Temperatures outside the ambient temperature range can influence the functional properties (torque/clamp force and prevailing torque properties). See annex A.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3098.1 Mechanical Properties of Fasteners — Bolts, Screws and Studs (GB/T 3098.1-2010, ISO 898-1: 2009, MOD)
GB/T 3098.2 Mechanical Properties of Fasteners — Nuts (GB/T 3098.2-2010, ISO 898-2:2012, MOD)
GB/T 5277 Fasteners — Clearance Holes for Bolts and Screws (GB/T 5277-1985, eqv ISO 273:1979)
GB/T 9145 General Purpose Metric Screw Threads — Limits of Sizes for the Screw Threads of Medium Quality and Preferable Plan (GB/T 9145-2003, ISO 965-2: 1998, MOD)
GB/T 16823.3 Fasteners — Torque/Clamp Force Testing (GB/T 16823.3-2010, ISO 16047:2005, IDT)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 16823.3 and the following apply.
GB/T 3098.9-2020 The following standards are cited：
GB/T 3098.9-2020 Cited by the following standards：
