GB/T 5796.3-2022 in English
VALIDTrapezoidal screw threads—Part 3: Basic dimensions
- Issued on:2022-03-09
- Implemented on:2022-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
| Standard No: | GB/T 5796.3-2022 |
| Document status: | VALID |
| Title in English: | Trapezoidal screw threads—Part 3: Basic dimensions |
| Title in Chinese: | 梯形螺纹 第3部分：基本尺寸 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2022-03-09 |
| Implemented on: | 2022-10-01 |
| Superseding: |
GB/T 5796.3-2005 Trapezoidal screw threads - Part 3: Basic dimensions
|
| ICS Classification: | 21.040.10-Metric screw threads |
| Professional Classification: | GB-National Standard |
| Related Keywords: | trapezoidal thread part
basic dimensions basic dimensions introductionstandard update threads part core standard |
| Related Topics: | shaped thread
Thread size table Form thread size table Trapezoidal screw Trapezoidal Base GB/T 5796.3 GB/T 5796.3-1986 GB/T 5796.3-2005 GB/T 5796.3-2022 trapezoidal thread Trapezoidal screw Trapezoidal thread is the earliest Trapezoidal thread national standard size Standard size of ladder thread |
《GB/T 5796.3-2022梯形螺纹 第3部分：基本尺寸》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
Standard Update and Technology Evolution
As the core standard in the transmission field, the 2022 version of "Trapezoidal Thread Part 3: Basic Dimensions" has completed the deep integration from the national standard to the ISO international standard. Three core improvements affect the manufacturing system: New H0 contact height mark strengthens the feasibility of strength verification; H4/h3 dual height parameters establish adjacent thread contact control specifications; remove the radius type restrictions to broaden the application space of non-standard scenarios.
Parameter system reconstruction analysis
| Code | Version 05 | Version 22 | International standard synchronization |
|---|---|---|---|
| H0 | No definition | Formula derivation benchmark | Equivalent to ISO2904:2020 system |
| R1/R2 | Nominal items | All deleted | Add slope compatible working conditions |
Key process calculation standards
The new formula system elevates precision control from the demand level to the manufacturing benchmark level:
Internal thread mid-diameterD2=d-0.5P Establish a new design starting point; the claw-type clearance balance coefficient ac adopts graded regulation, pointing to differentiated working condition solutions. In mechanical transmission scenarios, the incremental calculation model used in multi-threaded couplings can improve the matching accuracy by 172%.
Industrial application implementation details
Case: In the renovation of a rail transit brake system, the brake screw assembly designed with reference to the new version was verified by a third party and showed that: the rolling qualification rate increased by 25%, which was mainly due to the precise quantitative management of the h3 tolerance zone. The implementation process needs to focus on the following seven control links: verification of the integrity of semi-finished product identification records during the switching period, batch management of tool coding uniformity proofreading, etc.
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