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DIN 949-1
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汽标QC 121 QC121 121QC(GB898) 双头螺柱 b1=1.25d
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原机械部JB /T1308.14-1999 JB1308.14 1308.14J PN 2
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国标GB /T902.2-2010 GB902.2 902.2GB RD型电弧焊用焊接螺柱
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德标DIN 835-2010 DIN835 835DIN 双头螺柱b1≈2d
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德标DIN 34828-2005 DIN34828 34828DIN 单头焊接螺柱
A193 B7全螺纹/双头螺柱-发黑 苏州不锈钢螺丝厂家不锈钢美标弹垫产品名称：A1