M24 and M27 Tunnel Segment Bolts Manufacturer for Nanchang Metro Line 1
Anyang Railway Equipment Co., Ltd provided M24 and M27 Tunnel Segment Bolts Manufacturer for Nanchang Metro Line 1.
Nanchang Metro Line 1 is the first subway line built and operated in Nanchang, Jiangxi Province, China, the total length of the east extension project is 4360m.
Anyang Railway Equipment Co., Ltd(AT) supplied 62,000 sets of pipeline bolts for Nanchang Metro Line 1 in 2022, including M24 bolt (grade 6.8) with double nuts (grade 6) and double washers, the length of bolt arcs is 523.6mm. Besides, Anyang Railway Equipment Co., Ltd(AT) supplied 72,000 suits of pipeline bolts for Nanchang Metro Line 1 in 2022, M27 bolt (grade 6.8) with nuts (grade 6) with double nuts (grade 6) and double washers, the length of bolt arc is 545.5mm.
The surface of the segment tunnel bolts are treated with hot dip galvanizing. The circumferential bolts and the longitudinal bolts meet “Hexagon head bolts–Full thread” (GB/T5783-2000), the mechanical properties of the ring tunnel bolts are grade 6.8.
- The mechanical properties of the nuts are grade 6, the dimensions and technical data meet “Hexagon nuts”(GB/T 6170-2000).
- The flat washer are treated with hot dip galvanizing.
