GB/T 9074.32-2017Bolt or screw and washer assemblies with conical spring washers (English PDF)

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.

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 document. 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.

3.2 The size of the tapered elastic washer shall be in accordance with the provisions of GB/T 9074.31.

3.3 Typical examples of assemblies are shown in Figures 2 and 3.

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.

4 Technical conditions

The technical conditions and reference standards are shown in Table 3.

5 Mark