This part specifies hexagon socket pan head self-tapping screws with thread specifications of ST2.9 to ST6.3. If other technical requirements are required, they should be selected from the current standards (such as GB/T5280, GB/T3098.5 and GB/T3103.1). GB/T 2670.1-2004 Hexagon socket pan head self-tapping screws GB/T2670.1-2004 Standard download decompression password: www.bzxz.net

ICS 21. 060. 10
National Standard of the People's Republic of China
GB/T2670.1—2004
Hexagonal socket pan head tapping screws
Hexalobular socket pan head tapping screws(ISO14585:2001MOD)
2004-02-10 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
2004-08-01 Implementation
This part is one of the national standard "Hexagonal socket screws" product series standards. This series includes: a) GB/T2670.1-2004 hexalobular pan head tapping screws; GB/T2670.2-2004 hexalobular countersunk head tapping screws; GB/T2670.3-2004 hexalobular semi-countersunk head tapping screws; GB/T 2671.1--2004 hexalobular low cylindrical head screws; GB/T 2671.2---2004 hexalobular cylindrical head screws; GB/T2672-2004 hexalobular pan head screws; GB/T2673-1986 hexalobular countersunk head screws; GB/T2673-1986 hexalobular semi-countersunk head screws.
GB/T 2674—2004
This part is the first part of GB/T2670.
GB/T2670.1—2004
This part is modified to adopt IS014585:2001 "Hexagon socket pan head tapping screws" (English version), and the main modifications are as follows: - ISO14585 does not specify the technical requirements for packaging, this part specifies them (see Table 2); ISO14585 does not specify simplified marking, this part gives simplified marking examples according to the simplification principle of GB/T1237 (see 5.2). This part is proposed by the China Machinery Industry Federation. This part is under the jurisdiction of the National Technical Committee for Standardization of Fasteners (SAC/TC85). This part is drafted by the Mechanical Science Research Institute. This part is published for the first time.
1 Scope
Hexagon socket pan head tapping screws
This part specifies the hexagon socket pan head tapping screws with thread specifications of ST2.9~~ST6.3. GB/T2670.1—2004
If other technical requirements are required, they should be selected from the current standards (such as GB/T5280, GB/T3098.5 and GB/T3103.1). 2 Normative references
The clauses in the following documents become the clauses of this part through reference in this part of GB/T2670. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this part.
Fastener acceptance inspection (GB/T90.1—2002, idtISO3269:2000) GB/T 90.1
GB/T90.2Fastener marking and packaging
GB/T 1237
Fastener marking method (GB/T1237—2000, eqvISO8991:1986) GB/T3098.5Fastener mechanical properties, self-tapping screws (GB/T3098.5-2000, idtISO2702:1992) GB/T3103.1Fastener tolerances bolts, screws, studs and nuts (GB/T3103.1—2002, idtISO4759-1:2000) GB/T 5267.1
Fastener electroplating (GB/T5267.1—2002, ISO4042:1999, IDT) GB/T5276Fastener bolts, screws, studs and nutsSize codes and markings (GB/T5276--1985, eqvISO225:1983)
GB/T5280
Thread for self-tapping screws (GB/T5280—2002, idtISO1478:1999)Hexagonal socket head for bolts and screws (GB/T6188-—2000, idtISO10664:1999) GB/T 6188
3Dimensions
Dimension codes and markings (except A and y) are in accordance with GB/T5276. The types and sizes of self-tapping screws are shown in Figure 1 and Table 1. GB/T 2670. ---2004
y Reference.
Thread specification
Hexagonal shape
Type C, R
Nominal=max
Nominal=max
Flute No.www.bzxz.net
Note: The range of product length specifications is between the solid lines of the ladder. P
Pitch.
Distance from the bearing surface to the first complete thread. Length of incomplete thread.
Specifications marked with "-" in the table are not suitable for manufacturing. Table 1 Dimensions
GB/T 2670.1—2004
Unit is mm
GB/T2670.1—2004
4 Technical conditions and referenced standards
Technical conditions and referenced standards are shown in Table 2.
Mechanical properties
Hexagonal flower shape
Surface treatment
Acceptance and packaging
5 Marking
5.1 The marking method shall be in accordance with GB/T1237.
5.2 Marking example
2 Technical conditions and referenced standards
Product grade
Steel, as specified in GB/T3098.5
GB/T5280
GB/T 3098. 5
GB/T3103.1
GB/T6188
Without surface treatment;
Electroplated, technical requirements as per GB/T5267.1
GB/T 90. 1, GB/T 90. 2
Marking for C-type hexagon socket pan head tapping screws with thread specification ST3.5, nominal length l=16mm, galvanized: Self-tapping screws GB/T2670.1ST3.5X16
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