Description
Product Overview
The Ocean 76mm Setting Ring is a precision-ground internal reference standard used to set and verify bore measuring instruments to a known diameter. At ø76mm with a marked deviation of −0.001mm, this ring gives you a traceable reference point for zeroing bore gauges, internal micrometers, and air gauging systems — keeping your hole tolerances honest on the shop floor.
- Precision-ground bore with −0.001mm deviation marking — The engraved correction value tells you exactly how far the actual bore differs from the nominal 76mm diameter. That single figure is what separates a setting ring from a rough spacer: you can apply the offset when zeroing your instrument and hold tighter tolerances with confidence.
- Hardened steel construction with knurled OD — The outer diameter knurl gives a positive, non-slip grip when setting instruments by hand, while the hardened bore resists wear from repeated gauge contact. A soft bore would drift out of spec after modest use; hardened steel holds the reference geometry long-term.
- Flat lapped face surfaces — The lapped top face is the datum for consistent axial positioning of the gauge. A true, flat face ensures your bore gauge sits square in the ring every time, eliminating cosine error that would otherwise creep into your readings.
- Compatibility — Sized to set bore gauges, dial bore gauges, internal micrometers, and air gauging probes at the 76mm nominal. No additional accessories are required for standard setting use; a temperature-controlled surface or toolroom bench is recommended for best accuracy.
- Ideal for — Zeroing dial bore gauges before checking cylinder bores, hydraulic cylinder IDs, and bearing housing bores; setting internal micrometers for bushing and sleeve inspection; verifying bore gauge calibration on a surface grinder or jig borer setup; and incoming inspection of turned or bored components to 76mm nominal.
Condition
Used (Good Condition / Previously Deployed, Stored Correctly)
The bore — the only surface that does the actual measuring work — is clean, free of visible scoring, and presents well under inspection. The lapped top face shows light service marks consistent with normal workshop handling but retains its flat reference character. The outer knurl is intact and functional. The seller has lubed the ring and plastic-wrapped it for storage, which is exactly the right practice for a hardened steel gauge: it prevents atmospheric rust and keeps the bore surface protected between uses. Some light surface patina is visible on the flat face, typical of a used toolroom piece that has seen honest work. The bore itself does not show the kind of ring-marking or contact wear that would indicate misuse or damage to the reference surface. As with any used setting ring, best practice is to verify the bore dimension against a known master or CMM before committing to tight-tolerance work — the engraved −0.001mm correction value should be confirmed rather than assumed, especially if the ring has been out of a calibrated environment for an extended period.
Included:
- 1 x Ocean Setting Ring — ø76mm nominal, −0.001mm deviation, hardened steel
Not included: Storage or presentation case, calibration certificate
Brand Information
Ocean is a Japanese manufacturer of precision metrology standards and gauging accessories, producing setting rings, gauge blocks, and reference standards to toolroom and industrial quality levels. Japanese metrology tooling carries a well-earned reputation for consistent ground finishes and reliable hardening, and Ocean sits in the same practical tier as brands like Diatest and Etalon for reference standards used in production and toolroom environments. While not as broadly distributed in Australia as Mitutoyo or Mahr, Ocean setting rings are recognised in Asian-Pacific toolrooms as dependable, accurately marked reference pieces.
Specifications
| Feature | Specification |
|---|---|
| Brand | Ocean |
| Type | Setting Ring / Internal Reference Standard |
| Nominal Diameter | ø76mm |
| Marked Deviation | −0.001mm |
| Actual Bore (nominal + deviation) | 75.999mm |
| Material / Construction | Hardened steel, precision-ground bore, knurled OD |
| Face Finish | Lapped flat reference faces |
| Country of Origin | Japan |
| Condition | Used — Good Condition |
| Storage State | Lubed and plastic-wrapped; no box |
| Included Items | Setting ring only |
| Not Included | Case, calibration certificate |
Keywords
Ocean setting ring, Ocean 76mm setting ring, bore gauge setting ring 76mm, internal reference standard 76mm, setting ring bore gauge, toolroom setting ring Australia, dial bore gauge master ring, bore gauge zero ring, internal micrometer setting ring, precision bore standard, metrology setting ring, bore gauge calibration ring
