带有一个60度的V型测坫和锥型心轴,易于测量英制或统一标准的螺纹中径,棘轮锁定装置可保持恒定测力,带有调零基准杆.测量范围货号待测螺纹0-25mm125-1010.4-0.5mm/64-48TPI0-25mm125-1020.6-0.9mm/44-28TPI0-25mm125-1031-1.75mm/24-14TPI0-25mm125-1042-3mm/13-9TPI0-25mm125-1053.5-5mm/8-5TPI25-50mm125-1060.4-0.5mm/64-48TPI25-50mm125-1070.6-0.9mm/44-28TPI25-50mm125-1081-1.75mm/24-14TPI25-50mm125-1092-3mm/13-9TPI25-50mm125-1103.5-5mm/8-5TPI50-75mm125-1110.6-0.9mm/44-28TPI50-75mm125-1121-1.75mm/24-14TPI50-75mm125-1132-3mm/13-9TPI50-75mm125-1143.5-5mm/8-5TPI50-75mm125-1155.5-7mm/4.5-3.5TPI75-100mm125-1160.6-0.9mm/44-28TPI75-100mm125-1171-1.75mm/24-14TPI75-100mm125-1182-3mm/13-9TPI75-100mm125-1193.5-5mm/8-5TPI75-100mm125-1205.5-7mm/4.5-3.5TPI