GB/T 85-2018 in English
VALIDSquare set screws with long dog point
- Issued on:2018-12-28
- Implemented on:2019-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 85-2018方头长圆柱端紧定螺钉》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
Interpretation of GB/T 85—2018 Square Head Long Cylindrical Point Set Screws
GB/T 85—2018 "Square Head Long Cylindrical Point Set Screws" is one of the important standards in the field of fasteners. This article will provide a detailed interpretation from the aspects of standard formulation background, technical framework comparison and implementation suggestions.
I. Background of Standard Formulation
1. Historical Evolution of the Standard
- 1958: GB 85—1958 was first issued
- 1966: GB 85—1966 revised version issued
- 1976: GB 85—1976 further optimized
- 1988: GB/T 85—1988 converted into a national standard
- 2018: GB/T 85—2018 issued, replacing the old version
2. Key Points of Standard Revision
Compared with GB/T 85—1988, the new standard is mainly optimized in the following aspects:
- Add general technical conditions (GB/T16938)
- Stainless steel mechanical property grades adjusted to A1-12H, A2-12H, etc.
- New non-ferrous metal material requirements (CU2, CU3)
- Supplementary surface treatment technical requirements (non-electrolytic zinc flake coating, passivation treatment)
II. Comparison of technical specification frameworks
| Dimensions | Old standard (GB/T 85—1988) | New standard (GB/T 85—2018) |
|---|---|---|
| Material requirements | Only steel and stainless steel | New non-ferrous metals (such as copper alloys) |
| Mechanical property grade | No clear grading standard | Clearly divided into A1-12H, A2-12H, etc. |
| Surface treatment technology | Only electroplating requirements are specified | Newly added non-electrolytic zinc flake coating and passivation treatment |
III. Implementation Suggestions and Precautions
1. Material selection
Choose appropriate material according to the application scenario. Copper alloy is suitable for corrosive environment, and stainless steel is suitable for high durability requirements.
2. Quality Control
- Acceptance must be strictly carried out in accordance with the standard (GB/T 90.1)
- Surface treatment must comply with relevant technical requirements (such as non-electrolytic zinc flake coating according to GB/T5267.2)
3. Application Cases
For example, in automobile manufacturing, when selecting M10×30 square head long cylindrical end set screws, it is necessary to specify that the material is steel and the hardness grade is 33H, and indicate the surface treatment requirements (if no treatment).
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