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GB/T 6139-2007: Subland twist drills -- Technical specifications
Status: Valid GB/T 6139: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 6139-2007 | English | 159 |
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3 days [Need to translate]
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Subland twist drills -- Technical specifications
| Valid |
GB/T 6139-2007
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| GB/T 6139-1997 | English | 239 |
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2 days [Need to translate]
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Subland twist drills--Technical specifications
| Obsolete |
GB/T 6139-1997
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| GB/T 6139-1985 | English | RFQ |
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3 days [Need to translate]
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Subland twist drills with taper shanks for holes prior to tapping screw threads
| Obsolete |
GB/T 6139-1985
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PDF similar to GB/T 6139-2007
Basic data | Standard ID | GB/T 6139-2007 (GB/T6139-2007) | | Description (Translated English) | Subland twist drills -- Technical specifications | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J41 | | Classification of International Standard | 25.100.30 | | Word Count Estimation | 6,614 | | Date of Implementation | 2007-12-01 | | Older Standard (superseded by this standard) | GB/T 6139-1997 | | Regulation (derived from) | China National Standard Announcement 2007 No.7 (Total No.107) - National-Standard-Commission | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the ladder twist (ordinary level and precision) of size, material and hardness, appearance and surface roughness, logo and packaging technology requirements. This standard applies to the front by GB/T 6138. 1 and GB/T 6138. 2 produced by tapping drilling and other ladder ladder twist twist. | GB/T 6139-2007: Subland twist drills -- Technical specifications---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Subland twist drills. Technical specifications
ICS 25.100.30
J41
National Standards of People's Republic of China
Replacing GB/T 6139-1997
Twist ladder technical conditions
Posted 2007-07-26
2007-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard replaces GB/T 6139-1997 "Twist ladder technical conditions."
This standard and GB/T 6139-1997 compared to the main changes are as follows.
--- Cancel the performance test portion;
--- Increase the general level and precision of classification;
--- Increasing the precision bore diameter portion tolerance;
--- Increased precision stepped straight shank twist drill shank diameter tolerance;
--- Increased 4.4 requirements, namely. before tapping manufactured with flat tail when stepped straight shank twist drill, flat tail dimensions and tolerances press
GB/T 1442;
--- Increasing the ladder twist precision drilling and core drilling part of the countersunk part of the axis of symmetry;
--- Increasing the ladder twist precision cutting edge of the oblique axis circular countersunk sections beating;
--- Increasing the overall high speed steel (HSS-E) hardness shank;
--- Adds twist stepped surface roughness value precision.
The standard proposed by China Machinery Industry Federation.
This standard tool by the National Standardization Technical Committee (SAC/TC91) centralized.
This standard was drafted. the Henan Tools Co., Ltd., Shanghai Tool Works Co., Ltd.
The main drafters of this standard. Zhao Jianmin, Kong Chunyan, Pan Aiguo, Li Zheng-wei, Chen Liping, Hua Jianrong, Wang Zhuo Lin, Zhao Jianbin, Zhang Zhengang.
This standard replaces the standards previously issued as follows.
--- GB 6139-85, GB/T 6139-1997.
Twist ladder technical conditions
1 Scope
This standard specifies the ladder twist (general level and precision) of size, material and hardness, appearance and surface roughness, marking and packaging
Technical requirements.
This standard applies to press GB/T 6138.1 and GB/T 6138.2 produced before tapping drilling ladder ladder twist and other hemp
Flowers diamond.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms of dated references, all subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to study under this agreement is standard
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 1442 straight shank tools with drive flat tail and sleeve dimensions and tolerances (GB/T 1442-2004, ISO 4203. 1978,
MOD)
GB/T 1443 from machine tools and tool handles with clip cone (GB/T 1443-1996, eqv ISO 296.1991)
GB/T 1804 General tolerances for linear dimensions without individual tolerance (GB/T 1804-2000, eqv ISO 2768-1. 1989)
GB/T 6138.1 before tapping drilling stepped twist drills - Part 1. Straight shank twist ladder types and dimensions
(GB/T 6138.1-2007, eqv ISO 3439.2003)
GB/T 6138.2 before tapping drilling stepped twist drills - Part 2. Morse taper shank twist ladder types and dimensions
(GB/T 6138.2-2007, eqv ISO 3438.2003)
3 Symbol
4 Dimensions
h9, precision h8.
4.2 twist drill diameter portion of the stepped taper down. each 100mm length 0.02mm ~ 0.08mm.
4.3 stepped straight shank twist drill shank diameter tolerance. general level of h11, precision is h10; cylindrical tolerance as part of its holding
0.02mm.
4.4 Manufacturing stepped straight shank twist drill with flat tail, flat tail dimensions and tolerances according to GB/T 1442.
4.5 taper shank twist stepped taper Morse taper shank with a flat tail, Morse taper shank dimensions and tolerances according to GB/T 1443.
Pass level is js16, precision is js13.
Under special circumstances, according to the agreement between the stepped-General and the twist length of the channel is allowed to limit the size of the upper and lower adjacent ladder hemp
Flower diamond basic dimensions of length.
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