P&N
P&N Quick-Adjust Inside Caliper — 150mm (6″)
Part No: 267MTQ306 | Barcode: 9311744438457 | Series: P&N Workshop Inside Calipers
P&N’s 150mm inside caliper is designed for measuring internal diameters — bores, cylinders and tapped-hole widths — with quick-adjust screw precision. Carbon-steel legs bow outward to contact the inside wall and the adjustment bar dials in the dimension without removing the caliper from the workpiece.
150mm Legs
Carbon Steel
Quick-Adjust Screw
Bowed Inside Legs
Top Loop Handle
Compatible Work
Bores & Cylinders
Tube ID
Tapped Holes
Castings & Housings
General Engineering
Key Features & Benefits
- Quick-adjust screw bar — hand-set the dimension then fine-tune with the knurled nut, landing on the exact measurement without removing the caliper from the bore.
- Bowed inside-caliper legs — profile specifically shaped to reach through the bore and contact the diameter cleanly, not the entry chamfer.
- Hardened carbon-steel construction — retains its setting and resists wear from repeated use in engine and cylinder work.
- Top loop handle — comfortable to hold and rock through the bore looking for the true max diameter.
- Trusted P&N workshop heritage — Australian engineering-tool brand with decades of precision measuring-instrument production.
When to Use the 267MTQ306
Reach for the 267MTQ306 150mm inside caliper when you need to check or transfer an internal diameter — cylinder bores, valve guide IDs, tapped-hole widths, or hydraulic bore inspection. The 150mm size suits automotive and general engineering bore work. For measuring outside diameters on the same parts, pair with a P&N outside caliper (267MTQ206/208).
Pro Tip: When checking a bore, rock the caliper gently side-to-side until the legs just drag rather than slide — that’s the actual diameter. Pressing harder spreads the legs and reads oversize. Transfer to a micrometer or rule for the actual number.
Authorised Australian Dealer — This product is sourced directly from P&N Tools Australia and is backed by full Australian manufacturer warranty and local support.
Product Specifications
| Part No. | Leg Length | Imperial | Barcode |
|---|---|---|---|
| 267MTQ306 ★ | 150mm | 6″ | 9311744438457 |
| 267MTQ308 | 200mm | 8″ | 9311744438464 |
★ You are viewing the highlighted variant. Other sizes in this series are also available.
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