GB/T 2673.2-2020 in English
VALIDHexalobular socket high countersunk head screws
- Issued on:2020-03-06
- Implemented on:2020-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$117.00
| Standard No: | GB/T 2673.2-2020 |
| Document status: | VALID |
| Title in English: | Hexalobular socket high countersunk head screws |
| Title in Chinese: | 内六角花形高沉头螺钉 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-03-06 |
| Implemented on: | 2020-10-01 |
| ICS Classification: | 21.060.10-Bolts, screws, studs |
| Chinese Classification: | J13-Fastener |
| Professional Classification: | GB-National Standard |
| Related Keywords: | high countersunk screws
ordinary countersunk screws head high countersunk head hexagon socket countersunk screws countersunk structure |
| Related Topics: | GB/T 193
inner hexagon gb/t193 hexagon pattern Hexagonal Tube Hexagonal Tube GBT193 GB/T 2673.2 GBT26732 GB/T 2673.2-2020 countersunk screw Hexalobular pan head screws international Round head countersunk head hexagon socket bolts Hexagon countersunk head screws country Single pass hexagonal padding column Twist screws |
《GB/T 2673.2-2020内六角花形高沉头螺钉》由TC85（全国紧固件标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Standard Overview and Technical Background
GB/T 2673.2-2020 is a special technical specification for hexagon socket countersunk screws in my country, which is an important part of the fastener standard system. This standard revision adopts ISO14582:2013 international standard, and while maintaining technical coordination, it has been adaptively adjusted according to domestic industry needs.
Core parameters and technical characteristics
| Key indicators | GB/T 2673.2 requirements | Differences from ordinary countersunk screws |
|---|---|---|
| Head height | Increase by 10-15% | Ensure full load capacity |
| Thread specification | M3-M10 | Covering common mechanical connection requirements |
| Performance level | Grade 4.8/8.8/10.9 | Meet different strength requirements |
| Deep countersink | Needs to be deepened by 15-20% | Adapts to the heightened head design |
Comparative analysis of international standards
Compared with ISO14582:2013, this standard has made three major technical adjustments:
- Delete the open clauses that quote ISO4759-1 in the international standard and clarify the boundaries of technical requirements
- Add GB/T90.2 packaging technical requirements and GB/T5267.4 surface treatment specifications
- Optimize the marking system and adopt the simplified marking method specified in GB/T1237
Typical application case: In the fixation of new energy vehicle battery packs, 10.9 grade M8 high countersunk screws can increase the shear resistance by 30% while ensuring the flatness of the countersunk structure.
Implementation points and precautions
1. Dimension adaptation: During assembly, the countersink depth needs to be adjusted according to Table 1. It is recommended to use a special gauge (Figure 3) to detect the head height
2. Material selection: Screws above grade 8.8 should be made of alloy steel and heat treated, and carbon steel parts need to be treated with anti-corrosion
3. Marking specifications: Example "GB/T2673.2-M10×40" indicates a grade 10.9 standard screw with a nominal length of 40mm
Technology evolution trend
This standard reflects the trend of fastener technology towards high strength and specialization:
- Strength improvement without enlarging the diameter by increasing the head height
- Inner hexagonal flower design provides higher torque transmission capacity
- Gauge inspection system ensures consistency of key dimensions
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