GB/T 9074.1-2018 PDF English (GB/T 9074.1-2002: Older version)

GB/T9074.1-2018 (GBT9074.1-2018): PDF in English

GB/T 9074.1-2018 Bolt or screw and washer assemblies with plain washers ICS 21.060.10 J13 National Standards of People's Republic of China Replace GB/T 9074.1-2002 Bolt or screw and flat washer assembly (ISO 10644.2009, Screwandwasherassembliesmadeofsteelwithplain washers-Washerhardnessclasses200HVand300HV, MOD) Published on.2018-12-28 2019-07-01 implementation State market supervision and administration 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 assembly spring washer; ---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 first part of GB/T 9074. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 9074.1-2002 "Bolt or Screw and Flat Washer Assembly". This part is related to GB/T 9074.1-2002 The main technical changes are as follows. --- When the bolt or screw is ≤ 8.8, the hardness level of the washer is changed to.200HV or 300HV (see Table 3, Chapter 4 of the.2002 edition); --- Increase the technical requirements for non-electrolytic zinc sheet coating and phosphating (see Table 3); --- Add "If other technical requirements or surface treatment are required, the supply and demand agreement should be provided" (see Table 3); --- Increase the standardized combination of bolts or screws and washers (see Table 4); --- Mark the content to increase the hardness level of the gasket (see Chapter 6); --- Added informative Appendix A "Methods for producing bolts or screws and flat washer assemblies" (see Appendix A). This section uses the redrafting method to modify the ISO 10644.2009 "screw and washer assembly washer hardness class.200HV And 300HV. The technical differences between this part and ISO 10644.2009 and their reasons are as follows. --- In the normative reference documents, replace the international standards with Chinese standards (see Chapter 2), increase the reference to GB/T 90.1 (see Table 2), GB/T 90.2 (see Table 2) and GB/T 1237 (see 5.1) to comply with China's fastener basic standards; --- Increase packaging technical requirements (Table 2) to meet the basic standards of fasteners in China. This section also made the following editorial changes. --- Modified the standard name. 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. 7412 Factory in Zhoushan City, Zhejiang Haili Co., Ltd., Shanghai Shenguang High Strength Bolt Co., Ltd. Jinyi Industrial Co., Ltd., Qifeng Precision Technology Co., Ltd., Hunan Feiwo New Energy Technology Co., Ltd., Zhejiang Jingyi Standard Zhunquan Co., Ltd., Yuhuan Wanquan Machinery Manufacturing Co., Ltd., Zhejiang Gree Machinery Co., Ltd. Product Quality Supervision and Inspection Center. This part is explained by the National Fastener Standardization Technical Committee. The previous versions of the standards replaced by this section are. ---GB/T 9074.1-1988, GB/T 9074.1-2002; ---GB/T 9074.14-1988. Bolt or screw and flat washer assembly 1 Scope This part of GB/T 9074 specifies the type dimensions, technical conditions and markings for bolts or screws and flat washer assemblies. This section applies to thread sizes M2~M12, flat bearing surfaces, bolts or screws with performance grades of 8.8, 9.8 and 10.9, flat washers Bolts or screws and flat washer assemblies with a ring hardness rating of.200 HV or 300 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 65 slotted cylindrical head screw (GB/T 65-2016, ISO 1207.2011, MOD) GB/T 67 slotted pan head screw (GB/T 67-2016, ISO 1580.2011, MOD) GB/T 70.1 hexagon socket head cap screws (GB/T 70.1-2008, ISO 4762.2004, MOD) GB/T 90.1 fastener acceptance inspection (GB/T 90.1-2002, idtISO 3269.2000) GB/T 90.2 Fastener Marking and Packaging GB/T 97.4 flat washers for screw and washer assemblies (GB/T 97.4-2002, eqvISO 10673.1998) GB/T 818 cross recessed pan head screw (GB/T 818-2016, ISO 7045.2011, MOD) GB/T 1237 fastener marking method GB/T 2671.2 hexagonal flower-shaped cylinder head screw (GB/T 2671.2-2017, ISO 14579.2011, MOD) GB/T 2672 hexagonal flower-shaped pan head screw (GB/T 2672-2017, ISO 14583.2011, MOD) GB/T 3098.1 Mechanical properties of fasteners, bolts, screws and studs (GB/T 3098.1-2010, ISO 898-1.2009, MOD) GB/T 5267.1 Fastener Plating (GB/T 5267.1-2002, ISO 4042.1999, IDT) GB/T 5267.2 fastener non-electrolytic zinc sheet coating (GB/T 5267.2-2017, ISO 10683.2014, MOD) GB/T 5782 Hex Head Bolts (GB/T 5782-2016, ISO 4014.2011, MOD) GB/T 5783 hex head bolt full thread (GB/T 5783-2016, ISO 4017.2014, MOD) GB/T 5784 Hexagon Head Bolts, Grade B (GB/T 5784-1986, eqvISO 4015.1979) GB/T 11376 metal phosphate conversion film (GB/T 11376-1997, eqvISO 9717.1990) GB/T 16674.1 Hexagon head flange bolt series (GB/T 16674.1-2016, ISO 15071.2011, MOD) GB/T 16674.2 Hexagon head flange bolt small series of fine teeth (GB/T 16674.2-2016, ISO 15072.2012, MOD) 3 type size 3.1 Flat washer type size should meet the requirements of GB/T 97.4. 3.2 The size of the bolts and screws for the assembly shall be in accordance with the following requirements except for the assembly of the gasket, and the rest shall comply with the corresponding country. Standard regulations, such as GB/T 65, GB/T 67, GB/T 70.1, GB/T 818, GB/T 5782, GB/T 5783, GB/T 5784, etc.. ---Bolts and screws should have a thin rod of diameter ds, the diameter of the washer should be in accordance with GB/T 97.4, so that it can rotate freely. Note. ds≈ medium 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. --- Transition circle diameter da1 (see Figure 1 and Table 1), should be less than the transition circle diameter da specified in the product standard (see Table 4), the reduction is The difference between the nominal diameter and the diameter of the rolled thread blank. The curvature specified for the fillet in the corresponding national standard, in the assembly It should not change. Figure 1 Transition circle diameter da1 and polished rod diameter ds 3.3 Examples of bolts or screws and flat washer assemblies, see Figures 2 and 3. Figure 2 Bolts threaded to the washer Figure 3 Screw with thin rod Table 1 Dimensions are in millimeters Thread size Ab Max Da1 Max Flat washer size c Small series S type Standard series N type Large series L type Nominal D2 Max Nominal D2 Max Nominal D2 Max M2 M2.5 M3 (M3.5)a M4 M5 M6 M8 M10 M12 2Pd 2.4 0.6 4.5 0.6 5 0.6 6 2.8 0.6 5 0.6 6 0.6 8 3.3 0.6 6 0.6 7 0.8 9 3.7 0.8 7 0.8 8 0.8 11 4.3 0.8 8 0.8 9 1 12 5.2 1 9 1 10 1 15 6.2 1.6 11 1.6 12 1.6 18 8.4 1.6 15 1.6 16 2 24 10.2 2 18 2 20 2.5 30 12.6 2 20 2.5 24 3 37 a Try not to use the specifications in parentheses as much as possible. b The maximum distance from the bearing surface of the washer to the beginning of the complete thread of the first buckle, when measured with a flat surface (ie with a ring gauge that is not chamfered), the washer should be supported with the screw Face or head rounded corner contact, see Figure 2. c Dimensions taken from GB/T 97.4 are for reference only. dP---pitch. 3.4 According to the supply and demand agreement, a U-shaped undercut groove can be used under the hex head bolt head, see Figure 4 and Table 2. a Smooth transition. Figure 4 Alternative sub-U-shaped undercut Table 2 U-shaped dimensions are in millimeters Thread size d M3 M4 M5 M6 M8 M10 M12 Da2 max 3.6 4.7 5.7 6.8 9.2 11.2 13.7 r min 0.1 0.2 0.2 0.25 0.4 0.4 0.6 Max 0.20 0.25 0.25 0.30 0.40 0.40 0.50 Min 0.05 0.05 0.05 0.10 0.10 0.10 Note. The remaining dimensions are shown in Table 1. 4 Technical conditions and reference standards The flat washer in the assemb.......
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