GB/T 9074.32-2017 English PDF (GBT9074.32-2017)

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GB/T 9074.32-2017: Bolt or screw and washer assemblies with conical spring washers
GB/T 9074.32-2017
Bolt or screw and washer assemblies with conical spring washers
ICS 21.060.10
J13
National Standards of People's Republic of China
Bolt or screw and tapered spring washer assembly
Released on.2017-12-29
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Foreword
This part is one of the national standards for the “fastener assembly” series. The series includes.
---GB/T 9074.1 bolt or screw and flat washer assembly;
---GB/T 9074.2 cross recessed pan head screw and outer serrated lock washer assembly;
---GB/T 9074.3 cross recessed pan head screw and spring washer assembly;
---GB/T 9074.4 cross recessed pan head screw, spring washer and flat washer assembly;
---GB/T 9074.5 cross recessed small pan head screw and flat washer assembly;
---GB/T 9074.7 cross recessed small pan head screw and spring washer assembly;
---GB/T 9074.8 cross recessed small pan head screw, spring washer and flat washer assembly;
---GB/T 9074.9 cross recessed countersunk head screw and tapered lock washer assembly;
---GB/T 9074.10 cross recessed countersunk head screw and tapered lock washer assembly;
---GB/T 9074.11 Cross recessed hex head bolt and flat washer assembly;
---GB/T 9074.12 cross recessed hex head bolt and spring washer assembly;
---GB/T 9074.13 Cross recessed hex head bolts, spring washers and flat washer assemblies;
---GB/T 9074.15 Hex head bolt and spring washer assembly;
---GB/T 9074.16 Hex head bolt and outer serrated lock washer assembly;
---GB/T 9074.17 Hex head bolts, spring washers and flat washer assemblies;
---GB/T 9074.18 self-tapping screws and flat washer assemblies;
---GB/T 9074.20 cross recessed hex head self-tapping screws and flat washer assembly;
---GB/T 9074.26 Spring washers for assemblies;
---GB/T 9074.27 External sawtooth lock washer for assembly;
---GB/T 9074.28 Conical locking washer for assembly;
---GB/T 9074.31 Conical elastic washers for assemblies;
---GB/T 9074.32 Bolt or screw and tapered elastic washer assembly.
This part is the 32nd part of GB/T 9074.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by the China Machinery Industry Federation.
This part is under the jurisdiction of the National Fastener Standardization Technical Committee (SAC/TC85).
This section is responsible for drafting the unit. China Machine Productivity Promotion Center.
Participated in the drafting of this section. Shandong Tengda Fastening Technology Co., Ltd., Yuhuan Tianzhu Machinery Co., Ltd., General Machinery Industry
Parts Product Quality Supervision and Inspection Center.
This part is explained by the National Fastener Standardization Technical Committee.
Bolt or screw and tapered spring washer assembly
1 Scope
This part of GB/T 9074 specifies the type dimensions, technical conditions and markings for bolts or screws and tapered elastomeric washer assemblies.
This section applies to bolts or screws (GB/T 3098.1) with thread specifications of M2.5~M12, performance class 8.8 and 10.9.
Bolts or screws and tapered elastic washer assemblies (hereinafter referred to as assemblies) with a ring hardness of 420 HV to 490 HV.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 90.1 fastener acceptance inspection
GB/T 90.2 Fastener Marking and Packaging
GB/T 94.4 Elastic washer technical condition Conical elastic washer
GB/T 1237 fastener marking method
GB/T 3098.1 Fastener mechanical properties bolts, screws and studs
GB/T 5267.1 fastener plating
GB/T 5267.2 fastener non-electrolytic zinc sheet coating
GB/T 9074.31 Conical elastic washer for assembly
3 size
3.1 The dimensions of the bolts for the assembly shall be in accordance with the following requirements in addition to the following requirements.
---Bolts should have a thin rod of diameter ds (see Figure 1). The diameter of the washer should conform to GB/T 9074.31 so that it can rotate freely.
Ds ≈ thread diameter.
--- The distance from the bearing surface to the beginning of the complete thread of the first buckle should be increased to the maximum thickness that can accommodate the gasket. For this type of product, it will be
Thread the thread to a position close to the washer.
--- The transition circle diameter da1 (see Figure 1 and Table 1) should be less than the transition circle diameter da specified by the product standard, the reduction is the nominal diameter and
The difference in diameter of the rolled thread blank. The curvature specified for the fillet in the corresponding national standard should not be included in the assembly.
change.
3.2 The size of the tapered elastic washer shall be in accordance with the provisions of GB/T 9074.31.
Figure 1 Transition circle diameter da1 and rod diameter ds
3.3 Typical examples of assemblies are shown in Figures 2 and 3.
Figure 2 Full thread screw Figure 3 Hex head bolt
Table 1 Dimensions are in millimeters
Thread size
Max
Da1
Max
L2a
Min
Tapered elastic washer size
D2 h
Max min max min
M2.5 0.9 2.8 4 6 5.70 0.72 0.61
M3 1.0 3.3 4 7 6.64 0.85 0.72
(M3.5) 1.2 3.7 6 8 7.64 1.06 0.92
M4 1.4 4.3 6 9 8.64 1.30 1.12
M5 1.6 5.2 6 11 10.57 1.55 1.35
M6 2.0 6.2 8 14 13.57 2.60 2.30
M8 2.5 8.4 10 18 17.57 3.10 2.80
M10 3.0 10.2 12 23 22.48 3.60 3.30
M12 3.5 12.6 14 29 28.48 4.10 3.80
Note 1. The specifications in parentheses are not used as much as possible.
Note 2. In addition to the specified size, the remaining dimensions are specified in accordance with the corresponding product standards, such as GB/T 70.1.
a Shortest screw length.
3.4 After the supply and demand agreement, a U-shaped undercut groove can be used under the head of the hex head bolt, see Figure 4 and Table 2.
a Smooth transition.
Figure 4 U-shaped undercuts available under the head
Table 2 U-shaped dimensions are in millimeters
Thread size d M2.5 M3 M4 M5 M6 M8 M10 M12
Da2 max 3.0 3.6 4.7 5.7 6.8 9.2 11.2 13.7
r min 0.1 0.1 0.2 0.2 0.25 0.4 0.4 0.6
Max 0.2 0.2 0.25 0.25 0.3 0.4 0.4 0.5
Min 0.05 0.05 0.05 0.05 0.1 0.1 0.1 0.1
Note. The remaining dimensions are shown in Table 1.
4 Technical conditions
The technical conditions and reference standards are shown in Table 3.
Table 3 Technical conditions and reference standards
Item bolt or screw tapered elastic washer
General requirements The gasket in the assembly should be free to rotate without falling off
Mechanical behavior
Grade 8.8, 10.9 420HV~490HV
Standard GB/T 3098.1 GB/T 94.4
Surface treatment
Not treated;
Electroplating technology requirements are in accordance with GB/T 5267.1;
Non-electrolytic zinc sheet coating technology requirements according to GB/T 5267.2
Acceptance and packaging GB/T 90.1, GB/T 90.2
5 mark
5.1 Marking method
The marking method is as specified in GB/T 1237.
5.2 Tag example
GB/T 5783M6×30, 8.8 hex head bolts and GB/T 9074.31, taper elasticity with hardness 420HV~490HV
Gaskets, markings for untreated hex head bolts and tapered elastomeric gasket assemblies.
Assembly GB/T 9074.32 M6×30
One head with U-shaped undercut groove, M6×30, 8.8 grade hex head bolt and one GB/T 9074.31, hardness 420HV~
T...