GB/T 818-2016 in English

《GB/T 818-2016十字槽盘头螺钉》由TC85（全国紧固件标准化技术委员会）归口，主管部门为中国机械工业联合会。

Pan head screws with cross recess

1 Scope

This standard specifies the types, dimensions, technical conditions and designation of pan head screws with cross recess.

This standard is applicable to pan head screws of product grade A, with threads from M1.6 to M10, with property classes of 4.8, A2-50, A2-70, CU2, CU3 and AL4, and with type H and type Z cross recess.

2 Normative references

The following referenced documents are indispensable for the purpose 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 90.1 Fasteners - Acceptance inspection (GB/T 90.1-2002, ISO 3269:2000, IDT)
GB/T 90.2 Fasteners - Marking and packaging
GB/T 193 General purpose metric screw threads - General plan (GB/T 193-2003, ISO 261:1998, MOD)
GB/T 944.1 Cross recesses for screws (GB/T 944.1-1985, eqv ISO 4757:1983)
GB/T 1237 Designation system for fasteners (GB/T 1237-2000, eqv ISO 8991:1986)
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs (GB/T 3098.1-2010, ISO 898-1:2009, MOD)
GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and studs (GB/T 3098.6-2014, ISO 3506-1:2009, MOD)
GB/T 3098.10 Mechanical properties of fasteners - Bolts, screws, studs and nuts made of non-ferrous metals (GB/T 3098.10-1993, eqv ISO 8839:1986)
GB/T 3103.1 Tolerances for fasteners - Bolts, screws, studs and nuts (GB/T 3103.1-2002, idt ISO 4759-1:2000)
GB/T 5267.1 Fasteners - Electroplated coatings (GB/T 5267.1-2002, ISO 4042:1999, IDT)
GB/T 5267.2 Fasteners - Non-electrolytically applied zinc flake coatings (GB/T 5267.2-2002, ISO 10683: 2000, IDT)
GB/T 5267.4 Passivation of corrosion-resistant stainless-steel fasteners (GB/T 5267.4-2009, ISO 16048:2003, IDT)
GB/T 5276 Fasteners - Bolts, screws, studs and nuts - Symbols and descriptions of dimensions (GB/T 5276-2015, ISO 225:2010, MOD)
GB/T 5779.1 Fasteners - Surface discontinuities - Bolts, screws and studs for general requirements (GB/T 5779. 1-2000, idt ISO 6157-1:1988)
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 16938 Fasteners - General requirements for bolts, screws, studs and nuts (GB/T 16938-2008, ISO 8992: 2005, IDT)

3 Dimensions

See Figure 1 and Table 1 for the types and dimensions of screws.

Symbols and descriptions of dimensions are specified in GB/T 5276.

The shank diameter is approximately equal to the pitch diameter or equal to the permissible major thread diameter.

Foreword i
1 Scope
2 Normative references
3 Dimensions
4 Technical conditions and normative references
5 Designation