GB/T 37462-2019 in English
VALIDLocking threads with 30 degree wedge ramp
- Issued on:2019-05-10
- Implemented on:2019-12-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
| Standard No: | GB/T 37462-2019 |
| Document status: | VALID |
| Title in English: | Locking threads with 30 degree wedge ramp |
| Title in Chinese: | 30°楔形防松螺纹 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2019-05-10 |
| Implemented on: | 2019-12-01 |
| ICS Classification: | 21.040.30-Special screw threads |
| Chinese Classification: | J04-Basic standards and general methods |
| Professional Classification: | GB-National Standard |
| Related Keywords: | internal thread bevel major/minor diameter tolerance = medium diameter tolerance6h tolerance value
bevel±0.004~0.014mm thread end plug gaugemaximum bevel ordinary threads internal thread ordinary thread |
| Related Topics: | GBT37462
GB/T 37462-2019 Wedge net |
《GB/T 37462-201930°楔形防松螺纹》由TC108（全国螺纹标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
| Technical elements | Precision grade (4H/4h) | Medium grade (6H/6g) |
|---|---|---|
| Scope of application | Non-loosening and fastening connection with nominal diameter 1-39mm | |
| Tolerance zone position | 4H internal thread bevel major/minor diameter tolerance = medium diameter tolerance | 6H tolerance value is 30-50% larger than 4H |
| Typical applications | Aerospace, precision instruments | General machinery, transportation equipment |
Key Technical Features
The standard innovatively adopts the 30° bevel tooth design, and achieves anti-loosening by generating a normal force component through the contact between the thread crest and the bevel under the action of preload:
- A 30° bevel is set at the bottom of the internal thread (standard Figure 1)
- The external thread is compatible with both ordinary thread (M) and MJ thread
- The precision tolerance zone 4H/4h can achieve μm-level matching accuracy
Implementation and application suggestions
Typical application case
A high-speed railway bogie adopts the RLM24×3-6H thread pair, which has a 300% improvement in anti-loosening performance compared with ordinary threads in a vibration environment. Key parameters:
- Tolerance of major diameter of bevel: 24.278~24.448mm
- Calculation of median diameter: D₂=2D-D₅-0.866P
- Recommended preload ≥85% of bolt yield strength
Inspection and quality control
Appendix A of the standard specifies detailed technical requirements for gauges:
| Gauge type | Inspection elements | Allowance deviation |
|---|---|---|
| Threaded through-end plug gauge | Minimum major diameter of bevel | ±0.004~0.014mm |
| Thread end plug gauge | Maximum bevel major diameter | Screw in ≤2P |
| Smooth plug gauge | Top diameter | Enter ≤1P |
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