Please log in here to access all benefits, including promotional discounts and faster checkouts.

25-50mm Metric Outside Micrometer - 3203 Series (Insize)
| Range (mm) | 25-50 |
| Setting Ring | 287.5mm (optional) |
| l | 57 |
| a | 14 |
| b | 38 |
| Accuracy | ±0.004mm |
Learn more about Klarna
The 25-50mm Metric Outside Micrometer - 3203 Series from Insize is a precision external measuring instrument designed for engineers, machinists, inspectors, and hobbyists who need accurate, repeatable readings on small to mid-size parts. It measures outside dimensions in the 25 to 50 mm range and features carbide measuring faces for longer tool life in daily shop use. As Insize’s best-selling micrometer, the 3203 series is supplied with setting standards for quick, reliable setup (except 0–25 mm).
Carbide measuring faces resist wear from routine use, helping maintain accurate measurements even in busy workshop environments. The 3203 family covers sizes up to 300 mm, offering a durable, scalable solution for current projects and future needs.
- Carbide measuring faces for long tool life: Hard-wearing carbide tips resist wear, delivering consistent measurements in demanding shop conditions.
- 0.01 mm graduation for precise readings: Fine, easy-to-read increments enable repeatable checks and tighter tolerances with confidence.
- Includes setting standards for quick setup (except 0–25 mm): Ready-to-use references speed calibration and measurement setup, reducing downtime.
With the 25-50 mm Outside Micrometer - 3203 Series, you gain a reliable, user-friendly tool that streamlines measurement tasks, supports consistent results across parts, and helps you complete quality checks faster with greater confidence.
| Range (mm) | 25-50 |
| Setting Ring | 287.5mm (optional) |
| l | 57 |
| a | 14 |
| b | 38 |
| Accuracy | ±0.004mm |
| Read Out | Analogue |
| mm or Inch | mm |
| Data Output | No |
| Individual or Set | Individual |
| Graduation | 0.01mm |
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: Metric Outside Micrometers - 3203 Series (Insize)
View full collection →You are viewing 3203-50A. Click any other SKU to view its full details.
| Product SKU | Range (mm) | Accuracy | Price | Stock | Order |
|---|---|---|---|---|---|
| 3203-25A | 0-25 | ±0.004mm | £24.91 | 4-5 days | |
| 3203-50A Viewing | 25-50 | ±0.004mm | £27.32 | 4-5 days | |
| 3203-75A | 50-75 | ±0.005mm | £35.58 | 4-5 days | |
| 3203-100A | 75-100 | ±0.005mm | £39.94 | 4-5 days | |
| 3203-125A | 100-125 | ±0.006mm | £54.29 | 4-5 days | |
| 3203-150A | 125-150 | ±0.006mm | £62.21 | 4-5 days | |
| 3203-175A | 150-175 | ±0.007mm | £78.86 | 4-5 days | |
| 3203-200A | 175-200 | ±0.007mm | £82.07 | 4-5 days | |
| 3203-225A | 200-225 | ±0.008mm | £88.50 | 4-5 days | |
| 3203-250A | 225-250 | ±0.008mm | £102.16 | 4-5 days | |
| 3203-275A | 250-275 | ±0.009mm | £113.63 | 4-5 days | |
| 3203-300A | 275-300 | ±0.009mm | £120.52 | 4-5 days |
No products match your filters.


