INSIZE 3521-60 Digital Tubular Inside Micrometer
Are you looking for a precision instrument designed for measuring large internal diameters ranging from 6″ to 60″ (approximately 150 mm to 1,500 mm)? The INSIZE 3521-60 Digital Tubular Inside Micrometer is built for industrial and metrology environments, this micrometer combines rugged construction, fine resolution, and a durable design to deliver highly accurate internal bore measurements. It’s ideal for gauging large pipes, cylinders, or bores where standard inside micrometers may not reach.
Key Features
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Excellent Resolution: Displays measurements with a resolution of 0.00005″ (0.001 mm), enabling very fine internal dimension readings.
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Wide Measurement Range: Covers a broad range from 6″ to 60″, making it versatile for very large internal bores.
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High Accuracy Design: Accuracy is specified as
[0.00005 × (3 + n + L/2)]″, where n = number of extension rods and L = maximum measuring length in inches.
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Carbide Measuring Faces: The contact surfaces are made of carbide, improving durability and wear resistance for consistent, long-term measurement.
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Rugged Extension Rods: Comes with extension rods whose diameter is 0.866″, allowing flexibility to adapt to different measurement lengths.
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Water- & Dust-Resistant (IP65): The micrometer is rated IP65, protecting it from dust ingress and water spray, making it reliable in harsher shop-floor environments.
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Setting Standards Included: Supplied with certified setting standards so you can calibrate the micrometer before use.
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Optional Data Output: There is an optional data output cable for SPC/data-logging applications (not always included).
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Automatic Power-Off: Helps conserve battery life by powering down the unit when not in use (per catalog behavior).
Specifications
| Measuring Range |
6″ – 60″ (approx. 150 mm – 1,500 mm) |
| Resolution |
0.00005″ / 0.001 mm |
| Accuracy |
±[0.00005 × (3 + n + L/2)]″ (n = number of rods, L = max measuring length in inches) |
| Measuring Faces |
Carbide |
| Extension Rod Diameter |
0.866″ |
| Protection Rating |
IP65 (dust/water resistance) |
| Data Output |
SPC (when data cable accessory is used) |
| Power |
Digital electronics, battery-powered (with automatic power-off) |
| Weight |
Approx. 10 lb |
Items Included
- Main tubular micrometer head (6–7″)
- Extension rods (enough to span up to 60″ range)
- Setting standards (gauge ring or reference) for calibration
- Carrying / storage case
- Instruction manual / user guide (for operation, zeroing, rod handling)
Insize 3521-60 Digital Tubular Inside Micrometer Manual
