Description

Dial Bore Gauge CHUOKU 160–250 mm, 0.01 mm Graduation

The CHUOKU Dial Bore Gauge accurately measures the internal diameter of bores and cylinders. It covers 160–250 mm with a 0.01 mm dial graduation and is used to check roundness, taper, and wear in engine rebuilding and parts manufacturing. Supplied by BOWMAP Industry & Tooling, Samut Prakan.

Specifications

Brand	CHUOKU
Type	Dial bore gauge
Measuring range	160–250 mm
Graduation	0.01 mm
Measures	Bore ID, roundness, taper, wear
Packaging	Supplied as a boxed kit with multiple anvils/extensions (from product image)

Use cases

• Measuring cylinder bore diameter in engine rebuilds
• Checking roundness and taper of bores in boring and internal grinding
• Inspecting wear of liners and bushings during maintenance
• Dimensional QC of bores in machine-part production
• Comparing a bore against the drawing tolerance

Compatibility

Always zero the gauge against an outside micrometer or a master ring gauge before use, and fit the anvil and extension matched to the bore range. Rock the gauge gently in the bore to read the lowest value (true perpendicular point). Store it in its case and avoid knocks to preserve accuracy.

Availability

In stock at the BOWMAP warehouse in Samut Prakan, ready for same-day pickup or next-day delivery across Bangkok and the surrounding provinces. Contact us for bulk pricing on large orders.

Related products

• MITUTOYO outside micrometer (for zeroing)
• CHUOKU digital vernier caliper
• CHUOKU dial gauge
• CHUOKU combination square

FAQ

How do I zero a dial bore gauge before use?

Set zero against a known reference size — use an outside micrometer or a ring gauge to set the needle to zero at the target dimension, then insert the gauge into the actual bore. The reading is the deviation from the reference. This lets you measure the bore to 0.01 mm.

Why rock the gauge inside the bore?

Gently rocking finds the point where the anvil is truly perpendicular to the bore wall, which gives the lowest reading on the dial. Measuring at an angle reads larger than actual, so the correct value is the lowest turning point as you rock.

160–250 mm seems large — is there a smaller range?

This page is the 160–250 mm model for large bores such as big cylinders. CHUOKU offers other ranges for smaller bores; tell BOWMAP the bore size you need to measure and we will supply the model and anvil set covering your range.