MT 187.7-1988 Scraper conveyor fasteners Cup head square neck bolts

This standard applies to the semicircular head square neck bolts (hereinafter referred to as bolts) used in scraper box conveyors or transfer machines in coal mines. MT 187.7-1988 Scraper conveyor fasteners Semicircular head square neck bolts MT187.7-1988 Standard download decompression password: www.bzxz.net

Scope of application
Ministry of Coal Industry of the People's Republic of China Scraper conveyor fasteners
Semi-round head square neck bolts
MT 187.7-88
This standard applies to semi-round head square neck bolts (hereinafter referred to as bolts) used in underground coal mine scraper conveyors or transfer machines. 2 Reference standards
Scraper conveyor fasteners
3 Product classification
3.1 The product has two specifications, M12 and M16.
Bolt technical conditions
3.2 For types and sizes, see the figure below and Tables 1 and 2. Table 1
Limits approved by the Ministry of Coal Industry of the People's Republic of China on 1988-04-13
Implementation on 1988-08-01
Weight per 1000 steel
3.3 Marking example:
MT 187.7-88
Coarse pitch ordinary thread, major diameter 16mm, length 34mm, mechanical properties of semicircular head square neck bolts according to grade 4.6: Bolts M16×34—4.6MT187.7—88
3.4 ​​Marking description:
4 Technical requirements
M16X34—8.8
The mechanical properties of the bolts shall not be less than grade 4.6. 4.1www.bzxz.net
4.2 The technical conditions of the bolts shall be in accordance with the provisions of MT187.1. Additional notes:
MT187.7--88
—Standard code
Performance level
Product specification
Product name
This standard is proposed by the Technology Development Department of the Ministry of Coal Industry of the People's Republic of China. This standard is under the jurisdiction of the Taiyuan Branch of the Coal Science Research Institute. This standard is drafted by the Harbin Coal Mine Machinery Research Institute. The main drafters of this standard are Ji An and Cong Peijian. This standard is entrusted to the Taiyuan Branch of the Coal Science Research Institute for interpretation. 226
The limit deviation of L
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