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ITP Disc Styli stainless steel Prob Ball Material - M5 Thread x 8mm Ball Diameter - Type O - KHM508012056
| Thread Size | M5 |
| Ball Diameter (DK) | 8 |
| Overall Length (L) | 57 |
| Styli Type | Type O |
| Shank Diameter (DG) | 12 |
| Neck Diameter (DS) | 2.5 |
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The ITP Disc Styli stainless steel Prob Ball is a precision probing accessory designed for measuring large inside diameters and intricate undercuts. This Type O disc ball delivers reliable contact geometry in constrained features, making it a dependable choice for metrology setups.
- Material: Stainless steel construction for durability and corrosion resistance in shop environments.
- Ball Diameter: 8 mm probing ball to reach and measure large internal diameters and undercuts with stable contact.
- Thread: M5 mounting thread for secure, standard-compatible attachment to probing heads.
- Disc Type: Spherical disc segment—designed to access recessed features with precise geometry.
- Type / Code: Type O, part number KHM508012056, indicating the specific disc-stylus configuration.
- Applications: Ideal for measuring large internal diameters and integrated undercuts where traditional disks are insufficient.
- Probing Direction Note: Normal disks are unsuitable for probing in the Z direction unless discs with radius end rollers are used.
This disc stylus addresses real measurement challenges: it provides a compact, robust means to contact curved internal features and undercuts without compromising accuracy. The 8 mm ball paired with a stainless steel shaft offers repeatable results, easy cleaning, and long service life in demanding manufacturing and inspection environments. When planning measurements, keep in mind the Z-direction note to ensure your setup includes the appropriate end-roller configuration if vertical probing is required.
| Thread Size | M5 |
| Ball Diameter (DK) | 8 |
| Overall Length (L) | 57 |
| Styli Type | Type O |
| Shank Diameter (DG) | 12 |
| Neck Diameter (DS) | 2.5 |
| Stem Material | carbide |
| Base Material | stainless steel |
| Prob Ball Material | stainless steel |
| Measuring Length (ML) | 46 |
| B | 1 |
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.


