GB/T 39378-2020 in English
VALIDSockets for spark-plugs and glow-plugs
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$127.00
《GB/T 39378-2020火花塞和电热塞套筒》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
Analysis of the core content of the standard
| Technical dimension | GB/T 39378-2020 | ISO 11168:1995 | Difference analysis |
|---|---|---|---|
| Specification system | 12-25.5mm 8 specifications | 6 basic specifications | New 17.5/20.8/22.2mm specifications |
| Torque requirement | 42-128N·m classification | Unclassified | Establish quantitative indicators |
| Positioning device | Mandatory requirement | Recommendation | Improved insulation protection |
Detailed explanation of key technical requirements
1. Dimension specifications
The standard stipulates that the working end of the spark plug socket is divided into two types: hexagonal hole (L-type) and dodecagonal hole, and the opposite side size of the square hole at the transmission end is limited to two series of 10/12.5. Key dimension tolerance requirements:
- Across-side width s: +0.18~+0.36mm positive deviation
- Location hole diameter: 11.0-24.0mm
- Working hole depth ≥9.5mm
2. Performance indicators
Typical application case
A car 4S shop slipped when using a 19mm twelve-angle hole sleeve. After testing:
- Actual hardness 38HRC (lower than the standard 39HRC)
- Torque test 90N·m means deformation (standard requirement 100N·m)
- Electroplated layer thickness is only 4μm (standard ≥6μm)
Suggestions for the implementation of the standard
Key points for procurement verification
| Inspection items | Methods | Qualification standards |
|---|---|---|
| Pull-off force test | Tenciator + standard spark plug | 5-30N range |
| Torque test | Hexagonal test rod + torque machine | Keep no deformation for 30s |
| Roughness test | Ra sample comparison | ≤25μm |
Maintenance specifications
- Regularly check the elasticity of the positioning device
- Avoid contact with corrosive media
- Storage humidity ≤70%RH
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