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standard:DIN 931/933
Contact NowHaiyan Neptune Machinery&Electric Co., Ltd.
standard:DIN, ANSi,4.8,8.8,10.9,12.9,
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standard:DIN ,ANSI,JIS
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standard:4.8-10.9
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standard:DIN/ANSI B18.2.1/IFI/JIS
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standard:DIN933,DIN931,ASME B.18.2.1, SAE 429, ISO898
Contact NowNingbo Dongtuo Metal Products Co Ltd
