This part of GB/T 16823 specifies the conditions for carrying out torque/clamp force tests on threaded fasteners and related parts.
It is applicable, basically, to bolts, screws, studs and nuts made of carbon steel and alloy steel, whose mechanical properties are specified in GB/T 3098.1, GB/T 3098.2 or GB/T 3098.4, with thread sizes M3 to M39. It is also applicable to the combination of other externally and internally threaded fasteners which are in accordance with ISO 68-1.
It is not applicable to set screws and similar threaded fasteners that are not under tensile stresses, nor to screws which form their own mating thread or threaded fasteners having additional self-locking features.
Unless otherwise agreed, the tests are carried out at room temperature. However, tests carried out under standard conditions are made at a temperature of 10℃~35℃.
This method allows determination of the tightening characteristics of threaded fasteners and related parts.
2 Normative references
The following documents contain provisions which, through reference in this part of GB/T 16823, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions apply to this part.
GB/T 70.1 Hexagon socket head cap screws (GB/T 70.1-2008, ISO 4762:2004, MOD)
GB/T 96.1 Large series - Product grade A (GB/T 96.1-2002, eqv ISO 7093-1:2000)
GB/T 192 General purpose metric screw threads - Basic profile (GB/T 192-2003, ISO 68-1:1998, MOD)
GB/T 228 Metallic materials - Tensile testing at ambient temperature (GB/T 228-2002, eqv ISO 6892:1998)
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs (GB/T 3098.1-2010, ISO 898-1:1999, IDT)
GB/T 3098.2 Mechanical properties of fasteners - Nuts - Coarse thread (GB/T 3098.2-2000, idt ISO 898-2:1992)
GB/T 3098.4 Mechanical Properties of Fasteners - Nuts - Fine Pitch Thread (GB/T 3098.4-2000, idt ISO 898-6:1994)
GB/T 3103.3 Tolerance for fasteners - Plain washers (GB/T 3103.3-2000, idt ISO 4759-3:2000)
GB/T 5267.1 Fasteners - Electroplated coatings (GB/T 5267.1-2002, ISO 4092:1999, IDT)
GB/T 5267.2 Fasteners - Non-electrolytically applied zinc flake coatings (GB/T 5267.2-2002, ISO 10683:2000, IDT)
GB/T 5277 Fasteners - Clearance holes for bolts and screws (GB/T 5277-1985, eqv ISO 273:1979)
GB/T 5782 Hexagon head bolts (GB/T 5782-2000, eqv ISO 4014:1999)
GB/T 5783 Hexagon head bolts - Full thread (GB/T 5783-2000, eqv ISO 4017:1999)
GB/T 5785 Hexagon head bolts - Fine pitch thread (GB/T 5785-2000, eqv ISO 8765:1999)
GB/T 6170 Hexagon nuts, style 1 (GB/T 6170-2000, eqv ISO 4032:1999)
GB/T 6171 Hexagon nuts, style 1, with fine pitch thread (GB/T 6171-2000, eqv ISO 8673:1999)
GB/T 6175 Hexagon nuts, style 2 (GB/T 6175-2000, eqv ISO 4033:1999)
GB/T 6176 Hexagon nuts, style 2, with fine pitch thread (GB/T 6176-2000, eqv ISO 8674:1999)
GB/T 16674.1 Hexagon bolts with flange - Small series (GB/T 16674.1-2004, ISO 15071:1999, MOD)
GB/T 16674.2 Hexagon bolts with flange - Fine pitch thread - Small series (GB/T 16674.2-2004, ISO 15072:1999, MOD)
