This part specifies the hexagon socket head screws with thread specifications of M2 to M10, performance levels of 4.8, 5.8, A2-50, A2-70, A3-50, A3-70, CU2 and CU3, and product grade A. If other technical requirements are required, they should be selected from the current standards (such as GB/T193, GB/T9145, GB/T3106, GB/T3098.1, GB/T3098.6 and GB/T3103.1). GB/T 2671.1-2004 Hexagon socket head screws with bottom cylindrical head GB/T2671.1-2004 Standard download decompression password: www.bzxz.net

ICS 21. 060. 10
National Standard of the People's Republic of Chinawww.bzxz.net
GB/T 2671.1—2004
Replaces GB/T6190—1986
Hexagonal socket cheese (short) head screws
Hexalobular socket cheese (short) head screws(ISO 14580:2001,Hexalobular s0cket cheese head screws,MOD)2004-02-10Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
Implementation on August 1, 2004
This part is one of the national standard "Hexagonal socket screws" product series standards. This series includes: a) GB/T2670.1—2004
hexagon socket pan head tapping screws;
GB/T2670.2—2004
hexagon socket countersunk head tapping screws;
GB/T 2670.3—2004
GB/T 2671.1—2004
hexagon socket semi-countersunk head tapping screws;
hexagon socket low cylindrical head screws;
GB/T 2671.2—2004
hexagon socket cylindrical head screws;
GB/T 2672—2004
GB/T 2673—1986
GB/T 2674—2004
Hexagon socket pan head screws;
Hexagon socket countersunk head screws;
Hexagon socket semi-countersunk head screws.
This part is Part 1 of GB/T 2671.
GB/T 2671.1---2004
This part is modified to adopt ISO14580:2001 "Hexagon socket head self-tapping screws" (English version), and the main modifications are as follows: There is no "low" in the standard name of ISO14580. In order to distinguish it from GB/T2671.2 "Hexagon socket head screws", this part adds "low" in the name;
-1 ISO14580 does not specify the technical requirements for packaging, this part specifies them (see Table 2); - ISO14580 does not give specific performance levels for non-ferrous metal screws, this part specifies them (see Table 2); - ISO14580 does not specify simplified markings, this part gives simplified marking examples according to the simplification principle of GB/T1237 (see 5.2). This part replaces GB/T6190-1986 "Hexagon socket head screws-4.8 grade". Compared with GB/T6190-1986, the main changes of this part are as follows: the name of the standard has been modified;
- Cancel M12, (M14), M16 and M20, and add M2, M2.5, M3, (M3.5), M4 and M5 thread specifications (see Table 1);
The value of the screw head height k has been adjusted comprehensively (see Table 1); The maximum length specification of the screw has been adjusted comprehensively (see Table 1); Stainless steel, non-ferrous metal materials and their corresponding performance grades have been added (see Table 2); Grade 5.8 of carbon steel materials has been added (see Table 2); "Non-electrolytic zinc flake coating" has been added to the surface treatment (see Table 2). This part was 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 was drafted by the Mechanical Science Research Institute. The previous versions of the standards replaced by this part are: -GB/T 2671—1981;
-GB/T 6190--1986.
1 Scope
Hexagon socket low cylindrical head screws
GB/T2671.1—2004
This part specifies the hexagon socket low cylindrical head screws with thread specifications of M2 to M10, property grades of 4.8, 5.8, A2-50, A2-70, A3-50, A3-70, CU2 and CU3, and product grade A. If other technical requirements are required, they should be selected from the current standards (such as GB/T193, GB/T9145, GB/T3106, GB/T3098.1, GB/T3098.6 and GB/T3103.1). 2 Normative references
The clauses in the following documents become clauses of this part through reference in this part of GB/T 2671. For all dated references, 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 references, the latest versions are applicable to this part.
GB/T2 Fasteners Ends of external threaded parts (GB/T2--2001, idtISO4753:1999) GB/T65 Slotted cylindrical head screws (GB/T65-2000, eqvISO1207:1992) GB/T90.1 Fastener acceptance inspection (GB/T90.1-2002, idtISO3269:2000) GB/T 90.2 Fastener marking and packaging
GB/T193 General thread diameter and pitch series (GB/T193--2003, ISO261:1998, ISO general purpose metric screw threads-General plan,MOD)GB/T1237 Fastener marking method (GB/T1237--2000, eqvISO8991:1986)GB/T3098.1 Mechanical properties of fasteners Bolts, screws and studs (GB/T3098.1-2000, idtISO898-1:1999)GB/T3098.6 Mechanical properties of fasteners Stainless steel bolts, screws and studs (GB/T3098.6-2000, idtISO3506-1:1997)
GB/T 3098. 10
Mechanical properties of fasteners Bolts, screws, studs and nuts made of non-ferrous metals (GB/T3098.10-1993, eqvISO8839:1986)
GB/T 3103.1
Fastener tolerances Bolts, screws, studs and nuts (GB/T3103.1--2002, idtISO4759-1:2000) GB/T 3106
Nominal length of bolts, screws and studs and thread length of ordinary bolts (GB/T3106-1982, eqv ISO 888:1976)
GB/T 5267.1
Fastener electroplating (GB/T5267.1-2002, ISO4042:1999, IDT) GB/T 5267.2
Fastener non-electrolytic zinc flake coating (GB/T5267.2-2002, ISO10683:2000, IDT) GB/T 5276
eqv ISO 225:1983)
Fastener
GB/T 5779. 1
idtISO6157-1:1988)
Size codes and markings for bolts, screws, studs and nuts (GB/T5276-1985, Surface defects of fasteners General requirements for bolts, screws and studs (GB/T5779.1-2000, GB/T6188 Hexagonal socket head for bolts and screws (GB/T6188--2000, idtISO10664:1999) GB/T9145 Limit sizes for medium precision and preferred series of ordinary threads (GB/T9145-2003, ISO965-2:1998, ISO general purpose metric screw threads-TolerancesPart 2: Limits of sizes for general purposeexternal and internal screw threads--Medium quality,MOD)GB/T16938 General technical conditions for fasteners bolts, screws, studs and nuts (GB/T16938-1997, idtISO 8992:1986)
GB/T2671.1—2004
3 Dimensions
Dimension codes and markings (except A) are in accordance with GB/T5276. The types and dimensions of screws are shown in Figure 1 and Table 1.59
Note: The diameter d of the unthreaded rod is approximately equal to the thread pitch diameter or thread major diameter. The rolled end is shown in GB/T 2.
The edges can be round or straight, which can be selected by the manufacturer. Figure 1
Thread specification d
Nominal max
Nominal = max
Unit is mm
Thread specification d
Slot No.
Inner hexagonal shape
Note: The range of product length specifications is between the solid stepped lines. a
The specifications in brackets should not be used as much as possible.
Pitch.
Table 1 (continued)
(M3.5).
GB/T 26Z1.1---2004
Unit: mm
Mass of every 1000 steel screws (p=7.85kg/dm2)M8
CThe head height is increased compared with GB/T 65 to improve the head strength. 0.786
dThe length above the dotted line, threaded to the head (b=l-a); see GB/T 3106.1.09
GB/T 2671.1—2004
4Technical conditions and referenced standards
See Table 2 for technical conditions and referenced standards.
General technical conditions
Mechanical properties
Product grade
Hexagonal flower shape
Surface defects
Technical conditions and reference standards
Stainless steel
GB/T16938
GB/T 193,GB/T 9145
4.8, 5.8
GB/T 3098. 1
GB/T 5779.1
Without surface treatment;
Electroplating, technical requirements are in accordance with GB/T5267.1; Surface treatment
Acceptance and packaging
5 Marking
Non-electrolytic zinc flake coating, technical requirements are in accordance with
GB/T 5267.2
A2-50、A2-70
A3-50、A3-70
GB/T 3098. 6
GB/T 3103. 1
GB/T 6188
Simple treatment
Non-ferrous metals
GB/T 3098. 10
Simple treatment;
Electroplating, technical requirements according to
GB/T 5267.1
If other surface treatment is required, it shall be agreed upon by both parties GB/T 90. 1、GB/T 90. 2
5.1 Marking method is in accordance with GB/T1237.
5.2 Marking example
Marking of A-grade hexagon socket low cylindrical head screws with thread specification d=M5, nominal length l=20mm, performance grade 4.8, and no surface treatment:
Screws GB/T2671.1
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