This standard replaces GB 4141.7-84. This standard specifies the type, size and technical requirements of tapered handles. JB/T 7270.7-1994 Tapered handles JB/T7270.7-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7270～7277-94
Operating Parts
Published on June 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implemented on January 1, 1995
Mechanical Industry Standard of the People's Republic of China
Conical HandlebzxZ.net
Subject Content and Scope of Application
This standard specifies the type, size and technical requirements of the conical handle. 2 Reference Standards
JB/T7276 Operating Part Marking Method
JB/T7277 Technical Conditions for Operating Parts
Type and Size
The type and size of the conical handle shall be as specified in Figure 1 and Table 1. A location
Male pin hole d
Approved by the Ministry of Machinery Industry on 1994-06-18
JB/T7270.7--94
Implementation on 1995-01-01
Basic size
4 Marking
Limit control
+g: 018
Basic size
JB/T7270.7—94
Limit deviation
4.1 The marking method shall be in accordance with the provisions of JB/T7276. 4.2 Marking example
Type A, d=6, L=50,35 key, the mark of the sandblasted chrome-plated cone column handle is: handle 6×50JB/T7270.7SR
Type A, d=M6, L=50,35 steel, the mark of the sandblasted chrome-plated cone column handle is: handle M6×50JB/T7270.7A type, 5=5L=50.35 steel, the mark of the sandblasted key cone column handle is, handle 5×5×50JB/T7270.7B type, d=6, L=50, 35 pot, the mark of sandblasted chrome-plated cone column handle is: handle B6×50JB/T7270.7B type, d, =M6, L=50, 35 steel, the mark of sandblasted chrome-plated cone column handle is: handle BM6X50JB/T7270.7B type, 5=5, L=50, 35 steel, the mark of sandblasted chrome-plated cone column handle is: handle B5×5×50JB/T7270.75 Technical requirements
5.1 Material
35 steel Q235A.
5.2 Surface treatment
Sandblasting plating (PS/D·Cr); chrome plating sugar polish (D·L,Cr); oxidation (H,Y). 5.3 Other technical requirements shall be in accordance with the provisions of JB/T7277. Additional notes,
This standard is proposed and managed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry. This standard is under the responsibility of the Machinery Standardization Research Institute of the Ministry of Machinery Industry, and Shanghai Machine Tool Accessories Factory No. 6 and Shanghai Machine Tool Factory participated in the drafting. mm
Weight per piece
According to Appendix 3 of the State Bureau of Technical Supervision (1992) No. 549 document\, which was adjusted to the national standard for the industry\, this standard replaces GB4141.7-84.
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