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This standard is equivalent to international standard ISO 1580: 1994 Slotted Pan Head Screws - Product Grade A.
This standard is a part of the series standards of "screw-in fastener" products, which consist of:
a) Slotted pan head screws: GB/T 65, GB/T 67, GB/T 68, GB/T 69, GB/T 71, GB/T 72, GB/T 73, GB/T 74, GB/T 75, GB/T 828, GB/T 829, GB/T 830, GB/T 831, GB/T 832, GB/T 833, GB/T 837, GB/T 946, GB/T 947, GB/T 948 and GB/T 949;
b) Cross recessed screws: GB/T 818, GB/T 819.1, GB/T 819.2, GB/T 820, GB/T 822, GB/T 823 and GB/T 13806.1;
c) Hexagon socket screws: GB/T 70.1, GB/T 70.2, GB/T 70.3, GB/T 77, GB/T 78, GB/T 79, GB/T 80 and GB/T 5281;
d) Hexalobular socket screws: GB/T 2672, GB/T 2673, GB/T 2674, GB/T 6190 and GB/T 6191;
e) Round nuts: GB/T 815 and GB/T 817;
f) Wood screws, head tapping screws and assemblies: GB/T 99, GB/T 100, GB/T 101, GB/T 950, GB/T 951, GB/T 952, GB/T 845, GB/T 846, GB/T 847, GB/T 5282, GB/T 5283, GB/T 5284, GB/T 6560, GB/T 6561, GB/T 6562, GB/T 6564, GB/T 13806.2, GB/T 14210, GB/T 15856.1, GB/T 15856.2, GB/T 15856.3, GB/T 9074.1, GB/T 9074.2, GB/T 9074.3, GB/T 9074.4, GB/T 9074.5, GB/T 9074.6, GB/T 9074.7, GB/T 9074.8, GB/T 9074.9 and GB/T 9074.10.
Packing technology requirements, which are not specified in ISO 1580, are specified in this standard (Table 2).
The specific property class for nonferrous metal screw, which is not provided in ISO 1580, is provided in this standard (Table 2).
Simplified designation is not specified in ISO 1580, while this standard provides a simplified example of designation (5.2) in accordance with the simplification principle of GB/T 1237.
This standard is the revision of GB/T 67-1982, the main changes in this standard are as follows:
a) specifications of thread M3.5 are added (Table 1);
b) approximate mass per 1000 pieces is added (Table 1);
c) general requirements in GB/T 16938 are added (Table 2);
d) non-ferrous metal screws are added, and their property class is selected according to GB/T 3098.10 (Table 2).
This standard replaces GB/T 67-1985 from the implementation date hereof.
This standard was proposed by the State Bureau of Machine Building Industry.
This standard is under the jurisdiction of National Technical Committee on Fasteners of Standardization Administration of China.
The Secretariat of the National Technical Committee on Fasteners of Standardization Administration of China is in charge of the explanation of this standard.
ISO Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires construction organization approval by at least 75% approval by the member bodies voting.
International Standard ISO 1580 was prepared by Technical Committee ISO/TC 2, Fasteners.
This second edition cancels and replaces the first edition (ISO 1580:1983), which has been technically revised.
Slotted pan head screws
1 Scope
This standard specifies slotted pan head screws of product grade A, property classes 4.8, 5.8, A2-50, A2-70, CU2, CU3 and AL4 and with threads from M1.6 to M10 inclusive.
If specifications other than those listed in this standard are required, they shall be selected from existing standards, for example GB/T 196, GB/T 3106, GB/T 3098.1, GB/T 3098.6, GB/T 3098.10 and GB/T 3103.1.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, all editions listed were valid. All the standards will be modified, however, parties to agreements based on this standard shall investigate the possibility of applying the most recent editions of the documents indicated below.
GB/T 90-1985 Acceptance inspection, marking and packaging of fasteners (eqv ISO 3269:1984)
GB/T 196-1981 General purpose screw threads - Basic dimensions for diameter from 1 to 600mm
GB/T 197-1981 General purpose screw threads - Tolerances and fits for diameter from 1 to 355mm
GB/T 1237-2000 Designation system for fasteners (eqv ISO 8991:1986)
GB/T 3098.1-2000 Mechanical properties of fasteners - Bolts, screws and studs (idt ISO 898-1: 1999)
GB/T 3098.6-2000 Mechanical properties of corrosion-resistant stainless-steel fasteners - Part 1 : Bolts, screws and studs (idt ISO 3506-1:1997)
GB/T 3098.10-1993 Mechanical properties of fasteners Bolts, screws, studs and nuts made of non-ferrous metals (eqv ISO 8839:1986)
GB/T 3103.1-1982 (confirmed in 1988) Tolerances for fasteners - Bolts, screws and nuts (eqv ISO 4759-1:1978)
GB/T 3106-1982 (confirmed in 1988) Bolts, screws and studs; Nominal lengths and thread lengths for general purpose bolts (eqv ISO 888:1976)
GB/T 5267-2012 Electroplated coatings on threaded fasteners
GB/T 5276-1985 Fasteners; Bolts, screws, studs and nuts; Symbols and designations of dimensions (eqv ISO 225:1983)
GB/T 5779.1-2000 Fasteners-Surface discontinuities-Bolts, screws and studs for general requirements (idt ISO 6157-1:1988)
GB/T 16938-1997 Fasteners - General requirements for blots, screws, studs and nuts (idt ISO 8992:1986)
3 Dimensions
Note: designations and symbols of dimensions shall meet GB/T 5276.
The shank diameter is approximately equal to the pitch diameter or equal to the permissible major thread diameter.
Figure 1
Table 1 Dimension mm
Thread dimension d M1.6 M2 M2.5 M3 (M3.5)1) M4 M5 M6 M8 M10
4 Specifications and reference standards
Table 2 Specifications and reference standards
Material Steel Stainless steel Non-ferrous metal
General requirements GB/T 16938
Thread Tolerance 6g
Standard GB/T 196 and GB/T 197
Mechanical properties Grade 4.8, 5.8 A2-50, A2-70 CU2, CU3, AL4
Standard GB/T 3098.1 GB/T 3098.6 GB/T 3098.10
Tolerance Product grade A
Standard GB/T 3103.1
Surface defect GB/T 5779.1
Finish Plain Simple treatment Simple treatment
Requirements for electroplating are covered in GB/T 5267.
If different electroplating requirements are desired or if requirements are needed for other finishes, they shall be agreed between customer and supplier.
Acceptance and packaging GB/T 90
5 Designation
5.1 Designation system shall comply with the requirements of GB/T 1237.
5.2 Designation example
A plain slotted pan head screw with thread d = M5, nominal length l = 20 mm and property class 4.8 is designated as follows:
Pan head screw GB/T 67 M5×20
Foreword I
ISO Foreword III
1 Scope
2 Normative references
3 Dimensions
4 Specifications and reference standards
5 Designation
