◆ All bolts/nuts of grade 8.8grade 10.9 and grade 12.9 ◆ Special accessories for coal mine supportrail transit engineering accessoriesbuilding structure connectors ◆ Covering GB (national standard)DIN (German standard)ANSI (American standard)BS (British standard)JIS (Japanese standard)ISO (International standard) and other standard systems ◆ Customized stainless steelcopperaluminum alloy and other special material products and special-shaped non-standard parts
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