Suburban PB-123 Tri-Blocks gauge

Precision steel gauge block

The Suburban PB-123 Tri-Block is a single-piece steel gauge block sized at 1 in x 2 in x 3 in with no holes. It is supplied for dimensional inspection and calibration tasks in workshop or metrology environments.

Micrometer verification limits

The block delivers a squareness of 0.0002 in and parallelism of 200 micron in, setting the practical resolution for comparative measurements with micrometers or height gauges. Tolerance is held to +/- 0.0001 in, so readings beyond that band exceed the block’s certified accuracy.

Single-block capacity and headroom

As a solitary 1 in x 2 in x 3 in reference, it comfortably covers go/no-go checks and zero-setting for instruments up to its length. It runs out when a stack height, multi-size calibration set or holed configuration is required for angle plates or bore gauges.