GB/T 25666-2010 in English
VALIDParallel shank twist drills with carbide tips
- Issued on:2010-12-23
- Implemented on:2011-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$175.00
| Standard No: | GB/T 25666-2010 |
| Document status: | VALID |
| Title in English: | Parallel shank twist drills with carbide tips |
| Title in Chinese: | 硬质合金直柄麻花钻 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2010-12-23 |
| Implemented on: | 2011-07-01 |
| ICS Classification: | 25.100.30-Drills, countersinks, reamers |
| Chinese Classification: | J41-Cutting tools |
| Professional Classification: | GB-National Standard |
| Related Keywords: | carbide straight shank twist drills
shank twist drills shank twist drill shank twist twist drills |
| Related Topics: | twist drill
Twist numb non-rigid cuboid Straight shank twist drill GBT25666 GB/T 25666-2010 Carbide PDC drill bit carbide standard Carbide twist drill tolerances Carbide blade model Carbide drill bits for international use |
《GB/T 25666-2010硬质合金直柄麻花钻》由TC91（全国刀具标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
GB/T 25666-2010 Standard Overview
GB/T 25666-2010 "Carbide Straight Shank Twist Drills" is a Chinese national standard that mainly regulates the type, size, technical requirements, marking and packaging of carbide straight shank twist drills. This standard is applicable to carbide straight shank twist drills with a diameter of 5mm to 20mm.
Standard Development Background and Technical Evolution
With the rapid development of the machining industry, higher requirements are placed on the quality and performance of cutting tools. The formulation of the GB/T 25666-2010 standard aims to unify the technical specifications of carbide straight shank twist drills, ensure the consistency and reliability of the products, and meet the needs of modern machining.
Technical requirements for twist drill models and sizes
| Diameter range (mm) | Total length (mm) | Groove length (mm) | Reference value |
|---|---|---|---|
| 5.00-5.30 | 70 | 36 | The reference value for the standard type is E106 |
| 5.30-6.00 | 75 | 40 | The reference value for the standard type is E107 |
Technical conditions and quality control
The technical requirements of twist drills include:
- Material selection: The blade material is selected according to GB/T 2075 to ensure hardness and wear resistance.
- Dimension tolerance: The limit deviation of the total length and groove length is calculated as 3 times js16.
- Angle control: The helix angle is determined by the manufacturer, and the angle deviation is ±3'.
Implementation suggestions and practical applications
Case analysis: Manufacturing of 10mm diameter twist drill
Take a 10mm diameter carbide straight shank twist drill as an example, its marking should be:
Carbide straight shank twist drill 10 K30 GB/T 25666-2010 Note when manufacturing:
- The blade is welded firmly without cracks or chipping.
- The upper limit of surface roughness meets the requirements of Table 5 (such as Rz ≤ 3.2μm on the front, back and edge surface).
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