Mitutoyo 12-20mm Hole Micrometer Set 368-972

Description

Arriving late September 2025 for delivery – Pre-order now

Condition: Used – includes both internal micrometer heads (12–16 mm and 16–20 mm), the original setting ring, and the factory plastic case. The extension rod is missing.

---

Product Overview

This Mitutoyo Holtest 368-972 set is part of the trusted Series 368 three-point internal micrometers, celebrated for self-centering accuracy and wear-resistant titanium-nitride coated measuring pins. Compact and precise, each head utilizes a ratchet stop for consistent force. Designed for reliable bore measurements from 12 mm up to 120 mm when used with an optional extension rod, this partial set remains effective across its included ranges—even though it lacks the deeper-hole accessory.

---

Features & Specifications

Specification	Detail
Series / Model	Mitutoyo Holtest Internal Micrometer Set (368-972)
Included Ranges	12–16 mm and 16–20 mm micrometer heads
Accessories Included	Setting ring and original plastic case
Missing Component	Extension rod (for deep-hole measurement)
Measuring Method	Three-point, self-centering bore measurement
Contact Pins	Titanium-nitride coated for enhanced durability
Graduation (Resolution)	0.005 mm (standard for over-6 mm ranges)
Measuring Depth Capability	Normally expanded with extension rod for deep bores 株式会社ミツトヨ：精密測定機器の総合メーカーwillrich.com
Ratchet Stop	Yes—ensures repeatable measuring force
Condition Notes	Incomplete set; still functional for included range

---

Keywords

Holtest micrometer, Mitutoyo 368-972, internal micrometer 12–16 mm, precision bore gauge, three-point Holtest, machinist measuring tool.

---

Manufacturer Reference

Mitutoyo Holtest Series 368 – Official Product Page