GB/T 32.3-2020 in English
VALIDHexagon bolts with wire holes on head—Fine pitch thread
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
本部分规定了细牙六角头头部带孔螺栓的型式尺寸、技术条件和引用标准、标记。
本部分适用于螺纹公称直径d=8mm~48mm、细牙螺纹、性能等级为5.6、8.8、10.9、A2-70、A4-70、A2-50、A4-50、CU2、CU3和AL4级、产品等级为A和B级的六角头头部带孔螺栓。
本部分规定的螺栓是在符合GB/T5785产品的头部制出金属丝孔。
Introduction
Standard Evolution and Technological Change
GB/T32.3-2020, as the third part of the GB/T32 series of standards, has achieved a comprehensive upgrade of the 1988 version of the standard. The main technological innovations are: optimization of specification classification (dividing the type and size into two tables of preferred/non-preferred), improvement of the technical system (adding technical conditions and reference standard tables). The history of this standard can be traced back to GB32 in 1958, and has gone through three versions in 1976 and 1988.
Core parameter analysis
| Key indicators | Parameter range | Comparison with 1988 version |
|---|---|---|
| Thread specification | M8×1~M48×3 | New M42/M48 specifications |
| Performance level | 7 categories including 5.6~10.9/A2-70 | New A4-50/CU3 level |
| Wire hole diameter | φ2~φ4.3mm | The tolerance band is tightened by 0.05mm |
In-depth analysis of technical conditions
Special technical requirements for hexagonal head bolts with holes:
- Material system: Covers three categories: carbon steel, stainless steel (A2/A4), and non-ferrous metals (CU/AL)
- Mechanical properties: Diameter ≤39mm must comply with the requirements of GB/T3098.1/6/10
- Surface treatment: New option of non-electrolytic zinc flake coating (GB/T5267.2)
Typical application case: The spacecraft cabin connection requires the use of A4-70 grade stainless steel bolts, combined with φ3mm fuse holes to prevent loosening.
Implementation Suggestions
Selection Guide:
- Give priority to the preferred specifications in Table 1 (10 specifications in total from M8 to M48)
- For vibration environments, performance level 8.8 or above is recommended
- For corrosive environments, A2-70/A4-70 stainless steel should be selected
Acceptance Points:
- The diameter of the metal wire hole is detected by a go/no-go gauge
- The thread accuracy is controlled according to the medium precision of GB/T9145
- The surface defects meet the requirements of GB/T5779.1 Class B
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