4 Inch Outside Bow Spring Caliper With Roller Pivot And Solid Adjusting Nut The Go To Steel OD Measuring Tool For Shafts Dowels Pipes Up To 100mm Matte Finish

4-Inch External Bow Caliper for Precise OD to 100 mm (1 pc)
✔️ Solid adjusting nut, bow-spring tension, roller pivot

This 4-inch external spring caliper is designed to measure outer diameters of shafts, dowels, rods, pipes, bolts, and bores with repeatable accuracy. Its compact, solid steel build and matte finish resist glare and wear in busy workshop environments, making it a reliable choice for layout and inspection tasks.

✅ Measuring outer diameters up to 4 in (100 mm) with repeatable contact
✅ Bow-spring tension keeps legs loaded against the adjusting nut for stable settings
✅ Roller pivot and large bearing surface resist side deflection for true motion
✅ Solid adjusting nut enables drift-free fine tuning and quick repositioning
✅ Matte finished steel body built for machinists, toolmakers, and hobbyists

💡 What is an external spring caliper used for in precision measurement?

This handy tool is used for quick, repeatable outer-diameter checks and layout transfer.

- Outer diameter checks on shafts, dowels, pipes, and bores.

- Transfer measurements to rulers, micrometers, or workpieces for accurate setups.

- Durable steel body with a matte finish for long-term use in workshop environments.