接杆式内径千分尺 特点：
◆ 通过连接延长杆（延长管）有带有微分头的测砧可扩大测量范围
◆ 测量面带有硬质合金头（也可选择测量面不带硬质合金头的137经济型）
◆ 139系列采用高耐磨性延长管
◆ 140系列采用大直径延长管
接杆式内径千分尺 性能参数：
◆ 精度137、139系列：±（3＋n＋L/50）um[±(.00015＋.00005n＋.00005(L/2))″]
◆ 140系列：±（7＋n＋L/50）um[±(.0003＋.00005n＋.00005(L/2))″]
公制型 延长杆型
| 测量范围 | 货号(普通头) | 编号 | 货号(硬质合金头) | 分度值 | 测量行程 | 延长杆 |
| 50-63mm | 137-011 | IMZ-M | 137-013 | 0.01mm | 13mm | — |
| 50-150mm | 137-201 | IMZ-150 | 137-206 | 0.01mm | 13mm | 13mm,25mm,50mm |
| 50-300mm | 137-202 | IMZ-300 | 137-207 | 0.01mm | 13mm | 13mm,25mm,50mm(2个),100mm |
| 50-500mm | 137-203 | IMZ-500 | 137-208 | 0.01mm | 13mm | 13mm,25mm,50mm(2),100mm,200mm |
| 50-1000mm | 137-204 | IMZ-1000 | 137-209 | 0.01mm | 13mm | 13mm,25mm,50mm(2),100mm,200mm(2个),300mm |
| 50-1500mm | 137-205 | IMZ-1500 | 137-210 | 0.01mm | 13mm | 13mm,25mm,50mm(2),100mm,200mm(3个),300mm(2个) |
英制型 延长杆型
| 测量范围 | 货号(普通头) | 货号(硬质合金头) | 分度值 | 测量行程 | 延长杆 |
| 2"-2.5" | 137-012 | 137-014 | .001" | .5" | — |
| 2"-6" | 137-211 | 137-216 | .001" | .5" | .5",1",2" |
| 2"-12" | 137-212 | 137-217 | .001" | .5" | .5",1",2"(2个),4" |
| 2"-20" | 137-213 | 137-218 | .001" | .5" | .5",1",2"(2个),4",8" |
| 2"-40" | 137-214 | 137-219 | .001" | .5" | .5",1",2"(2个),4",8"(2个),12" |
| 2"-60" | 137-215 | 137-220 | .001" | .5" | .5",1",2",4"(2个),6",8"(3个),12"(2个) |
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