Insize 3221 Tubular Inside Micrometers
The Insize 3221 Tubular Inside Micrometer series is designed for precision measurement of large internal diameters, using a micrometer head paired with extension rods to reach across a wide span of bore sizes. Rather than requiring a separate tool for every size, the 3221 series lets you add extension rods to extend the measuring range, with models covering everything from 1"-2" up to 8"-40". Each unit offers .001" graduation and is well suited for shop floor inspection, CNC machining support, receiving inspection, and general industrial measurement work. Optional accessories, including a setting ring, gage block accessory, cylinder gage block, and caliper/height gage checker, are available to round out your measurement setup for specific applications.
Key Features
- Extension rod system allows one micrometer head to cover a wide range of large bore diameters
- .001" graduation for precise, easy-to-read measurements
- Measuring head travel of .25" to 1" depending on model
- Suitable for shop floor inspection, CNC machining support, and receiving inspection
- Compatible with optional setting ring, gage block accessory, cylinder gage block, and caliper/height gage checker
- Available in ranges from 1"-2" up to 8"-40" to fit a wide variety of bore sizes
Specifications
| Specification |
Detail |
| Measurement Ranges Available |
1"-1.25", 1"-2", 2"-2.5", 2"-8", 2"-12", 8"-9", 8"-20", 8"-40" |
| Graduation |
.001" |
| Accuracy |
[.0003 + .00005(L/2)]", where L = maximum measuring length (inch) |
| Micrometer Head Travel |
.25" to 1" depending on model |
| Extension Rods Included |
0 to 10 pieces depending on range (e.g., 2 rods for 3221-2; 10 rods for 3221-12) |
| Compatible Accessories |
Setting ring (P/N 6313), gage block accessory (P/N 6881), cylinder gage block (P/N 4001), caliper/height gage checker (P/N 6884) - sold separately |
Items Included
- Insize 3221 tubular inside micrometer head in the selected range
- Extension rods (quantity varies by range)
- Fitted storage case
- Instruction manual
Insize 3221 Tubular Inside Micrometers Data Sheet
