Description
Product Overview
The Mitutoyo Holtest 36-710 is a three-point internal micrometer designed for fast, repeatable bore measurement in the 40–45 mm range. Unlike a two-point bore gauge that requires a reference master to give an absolute reading, the Holtest self-centres in the bore via its three-contact anvil system, delivering a direct reading off the thimble — no tramming, no rocking, no guesswork. A staple of serious toolrooms and production floors across Japan and Australia for decades, this is a genuine Mitutoyo instrument with the pedigree to back it up.
- Three-point self-centring contact system — The tri-anvil head automatically centres itself in the bore, eliminating the angular error that plagues two-point bore gauges when the operator fails to find true diameter. For tight-tolerance work — think H7 fits, hydraulic cylinder bores, or bearing housings — this matters directly to the number on the thimble.
- Direct micrometer reading to 0.001 mm graduation — The thimble reads like a standard outside mic, so there’s no interpolation from a dial face or encoder display. On the bench, this means the reading is unambiguous and repeatable without a secondary reference gauge in hand.
- 40–45 mm measuring range — Covers a critical band of bore sizes that appear constantly in general machining: 40 mm and 45 mm are both common metric shaft/bore standards, and this single instrument handles the full 5 mm span without a head change or extension swap.
- Compatibility and accessories — The Holtest 36-710 is a standalone instrument. Setting rings are required for absolute zeroing and calibration verification; the seller notes setting rings are available separately — strongly recommended for any production or inspection application.
- Ideal for — Measuring bearing housing bores, checking cylinder liner internal diameters, verifying reamed or bored holes to H6/H7 tolerance, inspecting bushing fits on hydraulic or pneumatic components, and production QC on turned or bored 40–45 mm features.
Condition
Used (Good Condition / Pre-owned, Functionally Sound)
The measuring head contacts and anvil faces present well — no visible pitting, scoring, or chipping on the contact points, which is the surface that actually determines measurement integrity. The thimble rotates smoothly with consistent feel through the full range, and there is no detectable spindle slop or roughness in the mechanism. The instrument carries the expected patina of a used Mitutoyo — minor handling marks and light wear on the knurled grip body — but nothing that touches the precision surfaces or the calibrated thread. The original wooden storage case, paperwork, and original accessories are included, which is a genuine plus for a used Mitutoyo: the box keeps the anvils protected between uses and the documentation confirms the original specification. As with any pre-owned precision bore measuring instrument, verification against a calibrated setting ring in the 40–45 mm range before putting this to work on close-tolerance jobs is strongly recommended — not because there’s a known issue, but because it’s good metrology practice and the seller has correctly flagged that setting rings are available separately.
Included:
- 1 x Mitutoyo Holtest Three-Point Internal Micrometer, Model 36-710, 40–45 mm
- Original Mitutoyo wooden storage case
- Original paperwork / documentation
- Original Mitutoyo accessories (as supplied with instrument)
Not Included:
- Setting ring(s) — required for zeroing and calibration verification; available separately from the seller
Brand Information
Mitutoyo Corporation, founded in Japan in 1934, is the global benchmark in dimensional metrology — the name machinists reach for when accuracy is non-negotiable. Their instruments are manufactured to tolerances that satisfy ISO, JIS, and ASME standards, and Mitutoyo sits in the top tier of the global precision measurement market alongside Mahr and Tesa, and a clear step above the bulk of import tooling. Japanese-made Mitutoyo instruments carry a strong resale value and a well-established aftermarket calibration and service network in Australia, making them a sound long-term investment for any toolroom or inspection bench.
Specifications
| Feature | Specification |
|---|---|
| Brand | Mitutoyo |
| Model | 36-710 |
| Type | Three-Point Internal Micrometer (Holtest) |
| Series | 368 — Holtest Three-Point Internal Micrometer |
| Measuring Range | 40–45 mm |
| Graduation / Resolution | 0.001 mm |
| Accuracy | ±0.003 mm (verify against current Mitutoyo specification sheet) |
| Contact System | Three-point self-centring anvil |
| Material / Construction | Hardened steel anvils; aluminium alloy body |
| Country of Origin | Japan |
| Condition | Used — Good Condition |
| Included Items | Instrument, original wooden case, paperwork, original accessories |
| Not Included | Setting ring(s) — available separately from seller |
Keywords
Mitutoyo 36-710, Mitutoyo Holtest, Mitutoyo three-point internal micrometer, bore mic 40-45mm, Holtest internal micrometer, three-point bore gauge, internal micrometer toolroom, bore measurement precision, Mitutoyo Japan micrometer, bore mic machining, internal mic 40mm 45mm, precision bore gauge Australia
