Description
Product Overview
This is a Tsugami PTW Grade 0 Precision Ground Gauge Block Bar in 300mm — a Japanese-made reference standard intended for the toolroom, surface plate, or calibration bench where your measurements need to be traced back to something you can actually trust. Grade 0 is not a general-purpose grade; it sits at the top of the working gauge block hierarchy, making this a legitimate metrology-grade reference for setting comparators, verifying measuring equipment, and establishing ground reference dimensions with confidence.
- Grade 0 accuracy class — Grade 0 gauge blocks conform to the tightest tolerances in the working gauge block range (per JIS B 7506 and ISO 3650), with flatness and parallelism deviations measured in fractions of a micrometre. In practical terms, this means when you’re setting a comparator or zeroing a bench micrometer against this bar, the reference itself is not introducing error into your process.
- 300mm precision ground reference length — A 300mm bar covers the long-range reference requirements that a standard slip block set can’t easily stack to. It’s the right tool for calibrating or verifying long-range measuring instruments, setting up large bore or OD comparators, and providing a known datum for surface grinder depth-of-cut verification over longer travel.
- PTW gauge block format — PTW (Precision Tungsten / hardened and ground steel construction) gauge blocks feature lapped reference faces that are flat, parallel, and wrung-ready. The surface finish is critical — it’s what allows the block to wring cleanly to an accessory or surface plate and hold its stated dimension without mechanical fastening.
- Includes original box, documentation, and calibration certificate — The calibration certificate provides traceability, which matters the moment you need to justify your measurement process to a customer, auditor, or quality system. Out of the box, this block arrives with its provenance intact.
- Ideal for: setting and verifying bench and digital micrometers, zeroing comparators and dial bore gauges, calibrating height gauges and CMM reference artefacts, verifying surface grinder table travel and depth stops, and establishing reference datums during precision inspection of shafts, bores, and ground surfaces in a toolroom or quality lab environment.
Condition
(New — Factory Sealed)
This gauge block bar is new and factory sealed in its original Tsugami case. The reference faces have not been used, wrung, or exposed to the workshop environment — they remain in the as-manufactured condition as delivered from Tsugami’s production facility. The calibration certificate is included and pertains to this specific unit (storage box number 9763), providing full measurement traceability from new. There is nothing to disclose in terms of wear, surface condition, or handling marks because the tool has not been placed in service. The label on the case clearly identifies the product as PTW Gauge Block, Grade 0, 300mm, manufactured by Tsugami Corporation, Japan.
As with any gauge block that has been in storage — even factory sealed — it is standard good practice to verify the block against your own calibration master or send it for independent accredited calibration before introducing it into a formal QMS or customer-facing inspection process. The included certificate documents the original factory calibration; if your process requires current in-date traceability, schedule recalibration accordingly.
Included:
- 1 x Tsugami PTW Grade 0 Precision Ground Gauge Block Bar, 300mm
- Original Tsugami storage case (box number 9763)
- Calibration certificate / papers
Not included: No additional accessories, wring accessories, or comparator holders are included beyond the above.
Brand Information
Tsugami Corporation is a long-established Japanese precision machine tool and metrology manufacturer, headquartered in Tokyo, with a manufacturing heritage stretching back to 1923. In the metrology and precision tooling sector, Tsugami occupies a tier alongside recognised Japanese industry names such as Mitutoyo and RSK — products made in Japan to JIS standards, backed by a manufacturing culture where surface finish, dimensional accuracy, and process control are treated as non-negotiable rather than aspirational. Japanese-made gauge blocks in particular carry a strong reputation in the global toolroom market for consistent lapping quality and long-term dimensional stability, and Tsugami’s PTW blocks are no exception to that standard.
Specifications
| Feature | Specification |
|---|---|
| Brand | Tsugami Corporation |
| Product Name | PTW Gauge Block Bar |
| Type | Precision Ground Gauge Block (Single Bar) |
| Series | PTW |
| Nominal Length / Size | 300 mm |
| Accuracy Grade | Grade 0 (JIS B 7506 / ISO 3650 equivalent) |
| Material / Construction | Hardened and precision lapped steel (PTW construction) |
| Reference Face Condition | Lapped, wring-quality reference faces |
| Storage Box Number | 9763 |
| Country of Origin | Japan |
| Condition | New (Factory Sealed) |
| Included Items | Gauge block bar, original Tsugami case, calibration certificate / papers |
| Not Included | No additional accessories |
Keywords
Tsugami gauge block, Tsugami PTW grade 0, 300mm gauge block bar, precision gauge block Japan, grade 0 gauge block, toolroom reference standard, gauge block calibration, JIS gauge block, surface grinder reference, comparator setting block, precision metrology Australia, gauge block 300mm
