GB/T 5358-2021 in English
VALIDScrewdriver for hexalobular socket screws
- Issued on:2021-11-26
- Implemented on:2022-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 5358-2021内六角花形螺钉旋具》由TC174（全国五金制品标准化技术委员会）归口，TC174SC2（全国五金制品标准化技术委员会工具五金分会）执行，主管部门为中国轻工业联合会。
Introduction
Background of standard evolution and revision
GB/T5358-2021, as the latest version, replaces the 1998 version of the standard which has been in effect for 23 years.
- Adapt to the wide application of new 50CrV alloy steel materials
- Regulate the size system of small-size screwdrivers such as T5
- Improve the scientific nature of torque test methods
Analysis of key technical requirements
1. Product classification system
| Classification dimension | Type | Code |
|---|---|---|
| Working part structure | With hole type | H |
| Magnetic characteristics | Magnetic | C |
| Non-magnetic | No code |
2. Core performance indicators
Material requirements: The screw rod must be made of 50CrV steel specified in GB/T3077 or materials with equivalent performance, with a hardness of ≥50HRC
Torque test: Test according to the special torque test block in Appendix B. The torque value of the hole-type screwdriver is 85% of the standard value
Comparison of new and old standards
| Comparison dimensions | GB/T5358-1998 | GB/T5358-2021 |
|---|---|---|
| Specifications covered | Maximum T40 | Extended to T50 |
| Magnetic test | Steel ball diameter uniform 3mm | Graded by specifications (3-16mm) |
| Chamfering requirements | Not specified | 5° below T15, 20° above T20 |
Implementation suggestions
- Manufacturers should focus on updating the mold system to ensure that the chamfer of the working end meets the new regulations
- It is recommended to establish a regular inspection system for special quantities (refer to Appendix A)
- Magnetic products need to be equipped with test steel balls of different diameters as specified in Table 5
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