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允大螺丝工业股份有限公司致力于高拉力螺栓, 螺帽(A-325.B7.B16.2H.F10T)U型螺栓, 黑皮六角头螺栓, 岩栓, 基础螺栓(TypeI, TypeL, TypeJ), 六角承窝头螺栓, 特殊形状螺栓等产品及服务。