JB/T 7956.2-1999 This standard is a revision of JB/T 7956.2-95 "Hand-held long blade 1:50 taper pin reamer". During the revision, only editorial changes were made according to relevant regulations, and the technical content was not changed. The original standard non-equivalently adopted the international standard ISO 3465-1975 "Hand-held taper pin reamer". 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 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 long blade 1:50 taper pin reamer. This standard is applicable to hand-held long blade 1:50 taper pin reamer with a diameter of 0.6~50mm. This standard was first issued in 1984 as GB 1137-84 and was adjusted to JB/T 7956.2-95 in April 1996. JB/T 7956.2-1999 1:50 taper pin reamer Part 2: Hand-held long blade reamer JB/T7956.2-1999 Standard download decompression password: www.bzxz.net

1CS25.100.30
Machinery Industry Standard of the People's Republic of China
JB/T7956.1~7956.3-1999
1:50 taper pin reamer
Published on 1999-05-20
State Machinery Industry Bureau
Implementation on 2000-01-01
JB/T7956.2—1999
This standard is a revision of JB/T7956.2-95 (formerly GB1137—84) "Hand-held long-blade 1:50 taper pin reamer". During the revision, only editorial modifications were made in accordance with relevant regulations, and the technical content remained unchanged. The original standard adopts the international standard ISO3465-1975 "Hand-held Taper Pin Reamer". This standard is part of the JB/T7956 "1:50 Dimension Pin Reamer" series of standards, which includes the following three 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/T7956.2-95 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Knives. The responsible drafting unit of this standard: Chengdu Tool Research Institute. The main drafters of this standard: Lu Meiying and Fan Jin. ScopeWww.bzxZ.net
Mechanical Industry Standard of the People's Republic of China
1:50 Taper Pin Reamer
Part 2: Hand Long Blade Reamer
This standard specifies the type and size of hand long blade 1:50 taper pin reamers. This standard applies to hand long blade 1:50 taper pin reamers with a diameter of 0.6~50mm. Cited Standards
JB/T 7956.2-1999
Replaces JB/T7956.2-95
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, 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 dimension pin reamer GB/T4267—1984 Straight handle rotary tools and their shank diameter and transmission square head size 3
Type and size
3.1 The type of hand-held long-blade 1:50 taper pin reamer is shown in Figure 1, and the size is given in Table 1. Type A
(measurement of the edge band
Note: The angle value in the figure is for reference only
Approved by the State Machinery Industry Bureau on May 20, 1999 BB
Implementation on January 1, 2000
1 Professionally produced reamer is type A.
2 Reamers with a true diameter d≤6mm can be made into reverse tip. JB/T7956.2—1999
3 The deviation of the shank square head is in accordance with GB/T 4267, 3.2 Marking example
Diameter d=20mm, length /=250mm, type A, hand-held long blade 1:50 taper pin reamer is marked as long blade 1:50 taper pin reamer
20×250AJB/T7956.2--1999
4 Technical conditions
The technical conditions of hand-held long blade 1:50 dimension pin reamer shall comply with the provisions of GB/T4248. 6
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