This standard specifies the structure, dimensions, technical requirements and inspection rules of the hook nut positioning plate. This standard applies to the hook nut positioning plate used to prevent the nut from rotating in the hook device. JB/T 7687.4-1995 Straight shank hook nut positioning plate JB/T7687.4-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Straight Handle Hook Nut Positioning Plate
Subject Content and Scope of Application
JB/T 7687. 4-.
This standard specifies the structure, dimensions, technical requirements and inspection rules of hook nut positioning plates. This standard applies to hook nut positioning plates (hereinafter referred to as positioning plates) in hook devices that prevent the nut from rotating. Note: This standard should be used in conjunction with G1310051.5 and JB/T7687.3. 2 Reference standards
GB700 Carbon structural steel
GB10051.5 Lifting hook Straight handle single hook
GB/T13384
General technical conditions for packaging of electromechanical products
JB/T7687.3
Straight handle hook nut
3 Structure, size and model representation method of locating plate 3.1 The structure and size of the locating plate are shown in Figure 1 and Table 1. Z44:2
2—d3
16 and 20
32 and 10
Approved by the Ministry of Machinery Industry of the People's Republic of China on June 16, 19956
Implementation on July 1, 1996
63, 80 and 100
125.160 and 200
3.2 Model indication method
-Location plate width 6
Location plate center hole spacing
3.3 Marking example
JB/T7687. 4—95
Continued Table 1
Hook No. 6, the hole spacing is 75mm, the width is 25mm, and the positioning plate should be marked as: Positioning plate 75×25JB/T7687.4
4 Technical requirements
4.1 The material of the positioning plate should not be lower than Q235-A in GB700. 4.2 The unmarked tolerance should be the "grade" in GB/T1804 "General tolerance linear dimension unmarked tolerance". 4.3 The maximum allowable value of the surface roughness of the positioning plate shall comply with the provisions of Table 2. Table 2bzxZ.net
Force two sides|| tt||L Two-sided holes
4 When the hook nut positioning plate slot is matched with the positioning plate, the positioning plate should have matching marks. 4.4
The positioning plate should be smooth and free of cracks and rust stains. 4.5
5 Inspection rules
5.1 The positioning plates should be inspected piece by piece according to the requirements of Chapter 3 and Chapter 4. 5.2 The qualified positioning plates should be provided with certificates, 212
Marking, packaging
JB/T7687.4—95
Should be in the appropriate position of the positioning plate (generally on the plate surface) Make fixed and clear marks. 6.1
6.2 The packaging of the positioning plate shall comply with the relevant provisions of GB/T13384. The certificate of conformity and other random documents shall be placed in the packaging box. The content of the certificate of conformity is:
Supplier name or code;
Hook number:
Quantity;
Standard number.
Additional instructions:
This standard is proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Taiyuan Heavy Machinery. The main drafter of this standard is Zhao Yonghua.
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