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Pair of steel gauge blocks in wooden case

Suburban

Suburban B-123-H1-M Tri-Blocks gauge pair 1 in x 2 in x 3 in

SKU CH-1T6C-P1HNP

A pair of hardened-steel tri-block gauges with 0.0001 in squareness and ±0.0002 in tolerance, supplied in a wooden case

  • Product typeMicrometers
  • Precision alignment with 0.0001 in squareness tolerance
  • Reliable parallelism held to 200 micron across blocks
  • Tight dimensional control within +/- 0.0002 in tolerance
  • Secure mounting via 5/16-18 tapped holes in each block
  • Protected storage and transport in included wooden case

Tri-Block Pair for Inspection

The Suburban B-123-H1-M Tri-Block gauge pair consists of two hardened steel blocks sized 1 in x 2 in x 3 in. They are built for machinists and quality technicians who need a reference standard for checking squareness and parallelism on surface plates or during layout work.

Wooden Case and Tapped Holes

Each block includes a 5/16 in - 18 tapped hole for secure mounting or fixturing during measurement routines. The pair ships in a fitted wooden case that protects the finished faces and keeps the blocks together when not in use.

Squareness and Parallelism Tolerances

The set delivers squareness within 0.0001 in and parallelism within 200 micron in, with an overall tolerance of +/- 0.0002 in. These limits suit precision setup and inspection tasks but do not replace a calibrated gauge block set for higher-order metrology.

How it compares

Measured against everything we stock in Gauges & Tachometers, at today’s prices. Recalculated every night.

Price $173.99
Pricier than about 90% of the 193 comparable items (median $35.99).

Specifications

Product
Brand nameSUBURBAN
Product typeMicrometers

Questions about this item

How do I verify the Tri-Blocks meet the 0.0001 in squareness spec after setup?

Use a calibrated surface plate and indicator to measure squareness across the 3 in length; the pair should read within 0.0001 in.

What comes in the wooden case and what must I source separately?

The case holds the 1 in x 2 in x 3 in steel pair with 5/16-18 tapped holes; no calibration certificate or mounting hardware is included.

Which tolerance grade suits inspection versus layout work?

The +/- 0.0002 in tolerance with 200 micron parallelism fits precision inspection; choose a looser grade only for rough layout.

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