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 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
