JB/T 7956.1-1999 This standard is a revision of JB/T 7956.1-95 "Hand-held 1:50 taper pin reamer". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged. This standard is part of the JB/T 7956 "1:50 taper pin reamer" series of standards. This series of standards includes the following three parts: JB/T 7956.1: Hand-held reamer JB/T 7956.2: Hand-held long blade reamer JB/T 7956.3: Taper shank machine reamer This standard specifies the type and size of hand-held 1:50 taper pin reamer. This standard is applicable to hand-held 1:50 taper pin reamer with a diameter of 0.6~50mm. This standard was first issued in 1984 as GB 1136-84 and was adjusted to JB/T 7956.1-95 in April 1996. JB/T 7956.1-1999 1:50 taper pin reamer Part 1: Hand reamer JB/T7956.1-1999 Standard download decompression password: www.bzxz.net

ICS25.100.30
Machinery Industry Standard of the People's Republic of China
JB/T7956.1~7956.31999
1:50 taper pin reamer
Published on 1999-05-20
National Bureau of Machinery Industry
Implementation on 2000-01-01
JB/T7956.1-1999
This standard is a revision of JB/T7956.1-95 (formerly GB1136-84) "Hand-held 1:50 taper pin reamer". During the revision, only editorial modifications were made in accordance with relevant regulations, and the technical content remained unchanged. This standard is part of the JB/T7956 "1:50 taper pin reamer" series of standards, which includes the following parts: JB/T7956.1--1999 1:50 taper pin reamer Part 1: Hand reamer JB/T7956.2--1999 1:50 taper pin reamer Part 2: Hand long blade reamer JB/T7956.3-1999 1:50 taper pin reamer Part 3: Taper shank machine reamer
This standard replaces JB/T7956.1-95 from the date of implementation. This standard is proposed and managed by the National Tool Standardization Technical Committee. The responsible drafting unit of this standard: Chengdu Tool Research Institute. The main drafters of this standard: Lu Fuying, Fan ScopebZxz.net
Mechanical Industry Standard of the People's Republic of China
1:50 taper pin reamer
Part 1: Hand reamer
This standard specifies the type and size of hand-held 1:50 taper pin reamer. This standard applies to hand-held 1:50 taper pin cutters with a diameter of 0.6~50mm. 2 Referenced standards
JB/T 7956.1-1999
Replaces JB/T7956.1-95
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard: the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T4248-1984 Technical conditions for hand-held 1:50 taper pin reamer GB/T4267-1984 Shank diameter and drive square head size for straight tree rotary tools 3
Type and size
3.1 The type of hand-held 1:50 taper pin reamer is as shown in Figure 1, and the size is given in Table 1. Type A
Key back blade
Note: The angle value in the figure is for reference only.
Approved by the State Machinery Industry Bureau on May 20, 19992
Implemented on January 1, 2000
Basic limit
1 Professionally produced sensitive knives are according to Type A.
2 The reamer with diameter d≤6mm can be made into a reverse tip
3 The deviation of the square head of the vehicle body shall comply with the provisions of GB/T4267. 3.2 Marking example
JB/T7956.1-1999
The marking of the hand-held 1:50 taper pin reamer with diameter d-20mm, length/=180mm, type A, is 1:50 chain degree pin reamer 20×180AJB/T7956.1-19994 Technical conditions
The technical conditions of the hand-held 1:50 taper pin reamer shall comply with the provisions of GB/T4248. 16
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