This part specifies hexagon socket countersunk 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 2670.2-2004 Hexagon socket countersunk tapping screws GB/T2670.2-2004 Standard download decompression password: www.bzxz.net

ICS 21. 060. 10
National Standard of the People's Republic of China
GB/T2670.2--2004
Hexalobular socket countersunk head tapping screws
Hexalobular socket countersunk head tapping screws(ISO14586:2001,MOD)
Issued on 2004-02-10
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
Implementation on 2004-08-01
This part is one of the national standard "Hexagon socket screws" product series standards. This series includes: a)
hexagon socket pan head self-tapping screws;
GB/T 2670.1-2004
GB/T 2670. 2—2004
GB/T 2670.3—2004
GB/T 2671. 1-2004wwW.bzxz.Net
Hexalobular countersunk tapping screws;
Hexalobular semi-countersunk tapping screws;
Hexalobular low cylindrical head screws;
GB/T2671.2--2004 Hexalobular cylindrical head screws; GB/T2672-2004 Hexalobular pan head screws; GB/T2673-1986 Hexalobular countersunk head screws; g)
GB/T2674-2004
Hexalobular semi-countersunk head screws.
This part is Part 2 of GB/T2670.
GB/T 2670.2—2004
This part is modified to adopt ISO14586:2001 "Hexagon socket countersunk tapping screws" (English version), and the main modifications are as follows: - ISO14586 does not specify the technical requirements for packaging, this part specifies them (see Table 2), ISO14586 does not specify simplified markings, 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 countersunk tapping screws
This part specifies the hexagon socket countersunk tapping screws with thread specifications of ST2.9 to ST6.3. GB/T2670.2—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 agreements 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 apply to this part.
GB/T90.1 Fastener acceptance inspection (GB/T90.1—2002, idtISO3269:2000) GB/T90.2 Fastener marking and packaging
GB/T1237 Fastener marking method (GB/T1237—2000, eqvISO8991:1986) GB/T3098.5 Mechanical properties of fasteners Self-tapping screws (GB/T3098.5—2000, idtISO2702:1992) GB/T3103.1 Fastener tolerances Bolts, screws, studs and nuts (GB/T3103.1-—2002, idtISO4759-1:2000) Fastener electroplating (GB/T5267.1—2002, ISO4042:1999, IDT) GB/T 5267.1
GB/T5276 Fasteners Bolts, screws, studs and nuts Dimension codes and markings (GB/T5276-1985, eqVISO225:1983)
GB/T5280 Thread for self-tapping screws (GB/T5280--2002, idtISO1478:1999) GB/T6188 Hexagon socket head for bolts and screws (GB/T6188-2000, idtISO10664:1999) 3 Dimensions
Dimension codes and markings (except A and y) are in accordance with GB/T5276. The types and dimensions of self-tapping screws are shown in Figure 1 and Table 1. GB/T2670.2-2004
90°+\
The edges can be round or straight, which can be selected by the manufacturer. (y)
Thread specification
Hexagonal shape
Type C, R
Groove No.
Note: The range of product length specifications is between the solid lines of the ladder. a
Pitch.
The distance from the bearing surface to the first complete thread. The measurement of the head size shall comply with the provisions of GB/T5279. The length of the incomplete thread.
Specifications marked with "" in the table are not suitable for manufacturing. Table 1 Dimensions
GB/T 2670.2—2004
Unit is mm
GB/T2670.2-2004
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
Table 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/T 6188
Without surface treatment;
Electroplated, technical requirements as per GB/T5267.1
GB/T 90.1, GB/T90.2
Marking of C-type hexagon socket countersunk tapping screws with thread specification ST3.5, nominal length l=16mm, galvanized: Self-tapping screws GB/T2670.2ST3.5X16
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