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8-10mm 0.31-0.39" Three Point Internal Bore Micrometer - 3227 Series (Insize)
| Range (mm) | 46303 |
| Range (inch) | 0.31-0.39 |
| Setting Ring | 8mm (included) |
| b | 2.5 |
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Description
The Insize 3227 Internal 3‑Point Bore Micrometer is a precision tool designed for measuring inside bores with three‑point contact. It’s built for repeatable measurements in manufacturing, maintenance, and inspection, delivering stable readings across a range of bore sizes.
With carbide measuring faces and a ratchet stop, the instrument resists wear and maintains consistent measuring pressure, making it ideal for engineers, machinists, quality‑control professionals, and hobbyists who demand reliable results.
- Three‑point internal contact with carbide faces: Delivers stable, repeatable measurements with excellent wear resistance for long‑term accuracy.
- Ratchet stop for consistent measuring pressure: Ensures uniform contact force, prevents over‑tightening, and improves repeatability across measurements.
- Wide range up to 300 mm with setting ring and extension rods: Flexible coverage for various bore sizes, with ready‑to‑use accessories that speed setup and measurement.
Equipped with a 0.001 mm graduation, this bore micrometer enables fine tolerance control on internal diameters. The included setting ring and extension rods expand measurement versatility, helping you work faster, maintain quality, and keep production moving with confidence.
Part Numbers
- Protool Part Number
- 3227-10
- Brand
- Insize
- Category
- Measuring Tool
Need cutting data? Call 01732 887334 or email sales@protool-ltd.co.uk.
Delivery
Free UK mainland delivery on orders over £50 ex VAT. In-stock items ordered before 4:30pm are dispatched the same working day. Full delivery information.
Returns
14-day returns on unused stock items in original packaging. Special-order and bespoke tooling is non-returnable. Read our returns policy.
Technical Support
Over 30 years of machining experience behind the counter. Call 01732 887334, Mon–Thurs 8:30–17:30, Fri 8:30–16:30.
Trade Accounts
Credit accounts, contract pricing and scheduled call-off orders available for trade customers. Apply for an account.
What time are Protool open?
We are open Monday to Friday between 8:30am and 5pm.
Do you offer Free Next Day delivery?
Yes! We offer Free Next Day delivery via Royal Mail Tracked 24 on all orders over £50 ex VAT*. We also offer Free DPD Local Next Day delivery on all orders over £100 ex VAT*.
We also offer the following:
- Royal Mail Tracked 24 — £5.90 (FREE on orders over £50 ex VAT*). Order before 4:30pm for next day delivery. No signature required.
- DPD Local Next Day — £8.00 (FREE on orders over £100 ex VAT*). Standard next day delivery to UK mainland addresses.
- Royal Mail Special Delivery — £12.50. Guaranteed delivery before 1pm the next working day.
- DPD Saturday Delivery — £25.00. Must be ordered on Friday before 4pm. Pre-12pm delivery.
For delivery to Scottish Highlands & Islands, Northern Ireland, Republic of Ireland, or overseas locations, additional charges apply. Please see our delivery page for full details, or call us on 01732 887 334.
*T's & C's and exclusions apply. Please see our delivery page for more information on all our services.
Full Range: Three Point Internal Bore Micrometers - 3227 Series (Insize)
View full collection →You are viewing 3227-10. Click any other SKU to view its full details.
| Product SKU | Metric Range (mm) | Metric Range (Inch) | Ip Rating | mm or Inch | Price | Stock | Order |
|---|---|---|---|---|---|---|---|
| 3227-8 | 46240 | 0.24-0.31 | IP65 | mm|inch | £273.39 | 4-5 days | |
| 3227-10 Viewing | 46303 | 0.31-0.39 | IP65 | mm|inch | £273.39 | 4-5 days | |
| 3227-12 | 46366 | 0.39-0.47 | IP65 | mm|inch | £273.39 | 4-5 days | |
| 3227-16 | 42705 | 0.47-0.63 | IP65 | mm|inch | £219.13 | 4-5 days | |
| 3227-20 | 16-20 | 0.63-0.79 | IP65 | mm|inch | £219.13 | 4-5 days | |
| 3227-25 | 20-25 | 0.79-0.98 | IP65 | mm|inch | £285.91 | 4-5 days | |
| 3227-30 | 25-30 | 0.98-1.18 | IP65 | mm|inch | £285.91 | 4-5 days | |
| 3227-40 | 30-40 | 1.18-1.57 | IP65 | mm|inch | £325.57 | 4-5 days | |
| 3227-50 | 40-50 | 1.57-1.97 | IP65 | mm|inch | £354.78 | 4-5 days | |
| 3227-63 | 50-63 | 1.97-2.48 | IP65 | mm|inch | £393.39 | 4-5 days | |
| 3227-75 | 62-75 | 2.44-2.95 | IP65 | mm|inch | £408.00 | 4-5 days | |
| 3227-88 | 75-88 | 2.95-3.46 | IP65 | mm|inch | £427.83 | 4-5 days | |
| 3227-100 | 87-100 | 3.43-3.94 | IP65 | mm|inch | £449.74 | 4-5 days | |
| 3227-125 | 100-125 | 3.94-4.92 | IP65 | mm|inch | £563.48 | 4-5 days | |
| 3227-150 | 125-150 | 4.92-5.91 | IP65 | mm|inch | £636.52 | 4-5 days | |
| 3227-175 | 150-175 | 5.91-6.89 | IP65 | mm|inch | £705.39 | 4-5 days | |
| 3227-200 | 175-200 | 6.89-7.87 | IP65 | mm|inch | £814.96 | 4-5 days | |
| 3227-225 | 200-225 | 7.87-8.86 | IP65 | mm|inch | £1,039.30 | 4-5 days | |
| 3227-250 | 225-250 | 8.86-9.84 | IP65 | mm|inch | £1,173.91 | 4-5 days | |
| 3227-275 | 250-275 | 9.84-10.83 | IP65 | mm|inch | £1,361.74 | 4-5 days | |
| 3227-300 | 275-300 | 10.83-11.81 | IP65 | mm|inch | £1,581.91 | 4-5 days |
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