Mitutoyo 369-351-30 | Non-Rotating Spindle Disc Micrometer | 1–2 in, IP65, 20 mm Disc

The Mitutoyo 369-351-30 is a Series 369 IP65 inch/metric disk micrometer with a non-rotating spindle, 20 mm measuring disks, and a 1-2" (25.4-50.8 mm) measuring range. Genuine Mitutoyo from General Tech, authorised distributor in Saudi Arabia. Request a quote.

Part No. 369-351-30
Call +966 531 321586 for pricing and stock availability.

Product Overview

Measuring gear teeth, thin flanges and soft materials with a standard micrometer can be difficult because flat anvils cannot easily reach between teeth, while a rotating spindle can twist or mark the workpiece. The Mitutoyo 369-351-30 uses thin 20 mm measuring disks to reach into narrow spaces across a 1-2" (25.4-50.8 mm) measuring range.

The non-rotating spindle eliminates torque on the workpiece, helping prevent deformation and wear, while IP65 protection makes the instrument suitable for shop-floor environments where dust and coolant may be present. It is genuine Mitutoyo, supplied through an authorised distributor.

Typical applications include checking gear root tangent length, measuring thin flanges, ribs and narrow recesses, and inspecting soft materials such as rubber, felt, cardboard and fabric. The Digimatic data output allows readings to be transferred to SPC or data collection systems.

For best accuracy, allow the micrometer and workpiece to reach the same temperature before measuring. Avoid holding the frame for extended periods because hand heat can cause thermal expansion and affect readings, particularly with larger micrometer frames.

For ranges that do not start at zero, the micrometer is set using a standard bar. Confirm the gear module or part dimensions with our team so the correct measuring range can be selected. General Tech can also arrange calibration.

Comparing options? See the Mitutoyo 369-352-30, which covers 2-3" (50.8-76.2 mm).

Key Benefits

• 20 mm measuring disks reach into narrow recesses

• Designed for measuring gear root tangent length

• Non-rotating spindle helps eliminate torque on the workpiece

• IP65 protection for shop-floor use

• 1-2" (25.4-50.8 mm) measuring range

• Digimatic data output for SPC and data collection

• Genuine Mitutoyo from an authorised distributor in Saudi Arabia

Call +966 531 321586 for pricing and stock availability.

Who This Product Is Best For

• Gear manufacturers checking root tangent length

• Machine shops measuring thin flanges, ribs and narrow recesses

• Quality-control teams inspecting soft materials such as rubber, felt and card

• Manufacturing and inspection environments requiring Digimatic data output

How to Specify & Install It

1. Clean the measuring disk faces before use.

2. Set the origin on the measuring disks or with a suitable standard bar.

3. Position the disks correctly on the workpiece.

4. Apply measuring force using the ratchet stop.

5. Read the measurement on the display or transfer the value through the data output.

Frequently Asked Questions

What is a disk micrometer used for?
A disk micrometer is mainly used to measure the root tangent length of spur and helical gears. It is also suitable for measuring thin sections, narrow recesses and soft materials.

What size are the measuring disks?
The Mitutoyo 369-351-30 has 20 mm diameter measuring disks.

Why does this micrometer have a non-rotating spindle?
The non-rotating spindle helps eliminate torque on the workpiece, reducing the possibility of deformation or wear during measurement.

Is the Mitutoyo 369-351-30 suitable for shop-floor use?
Yes. Its IP65 protection helps protect the instrument against dust and coolant exposure in suitable shop-floor environments.

Should I choose the 369-351-30 or the 369-352-30?
The 369-351-30 covers 1-2" (25.4-50.8 mm), while the 369-352-30 covers 2-3" (50.8-76.2 mm). Select the model according to the dimensions of the parts being measured.

How should I care for the instrument?
Wipe the measuring faces clean after use and store the micrometer in its case away from excessive heat, humidity and coolant. Regular calibration helps maintain measurement reliability.

Can the instrument be calibrated?
Yes. General Tech Saudi provides calibration services for dimensional measuring instruments. Ask our team about calibration when you order.

Can you supply other Mitutoyo instruments in the same order?
Yes. General Tech can supply a wide range of Mitutoyo micrometers, bore gauges, calipers and indicators. Contact the team to request a combined quotation.

Is genuine Mitutoyo available in Saudi Arabia?
Yes. General Tech is an authorised Mitutoyo distributor. Contact the team for current pricing, availability and lead time.

Call +966 531 321586 for pricing, availability and quotation.