Description
Product Overview
The SK 30mm Setting Ring is a precision-ground internal reference standard used to set and verify bore measuring instruments to a known diameter. Whether you’re zeroing a bore gauge, qualifying a three-point internal micrometer, or confirming the calibration of a snap gauge, a quality setting ring is the ground reference that everything else is measured against. This example, marked 呼 30 (nominal 30mm) with an actual deviation of -D 0009 (indicating the actual size is ground to a controlled deviation from nominal), is a genuine Japanese-made SK tool — the kind of reference standard you’d expect to find in a proper toolroom, not a hobby catalogue.
- Ground and lapped bore to traceable tolerance — The internal bore is precision-ground and lapped to a certified deviation from nominal (stamped directly on the face), so you’re not guessing at zero when you set your bore gauge. The stamped actual deviation means this ring can be used as a direct reference without an additional calibration certificate for most workshop applications.
- Hardened steel construction — Setting rings cop a lot of handling. The hardened body resists wear on the reference bore, meaning the ring holds its size over years of daily use at the bench — unlike soft or cast alternatives that drift with repeated gauge insertion.
- Nominal 30mm with stamped actual deviation (-D 0009) — The deviation is stamped on the face in the Japanese JIS convention. The “-D 0009” marking indicates the actual bore is ground to a specific minus deviation from the 30mm nominal, consistent with JIS B 7420 setting ring standards. This is the figure you apply when setting a two-point or three-point bore gauge to achieve a true zero reference.
- Compatibility — Suits any bore gauge, bore micrometer, air gauge plug, or snap gauge set up for the 30mm range. No additional accessories are required to use this as a setting standard; an instrument with a 30mm range and the appropriate anvil configuration is all that’s needed.
- Ideal for — Zeroing dial bore gauges and Holtest-style three-point micrometers for engine cylinder, hydraulic bore, and bearing housing inspection; qualifying bore gauges before a production run on a CNC machining centre; checking bore gauge repeatability on a surface plate; and setting snap gauges for go/no-go inspection of 30mm shafts and pins.
Condition
(Used — Good Condition / Pre-owned, working reference standard)
The reference bore shows no visible damage, scoring, or deformation — the surfaces that matter for accurate gauge setting are intact and functional. The outer faces and OD show light handling marks and a modest patina consistent with careful workshop storage, which is entirely normal for a used setting ring. There is no pitting, corrosion, or wear visible on the lapped internal bore. The stamped markings — nominal size, actual deviation, and manufacturer details — are clearly legible. The ring seats correctly in its original packaging and shows no signs of having been dropped or mishandled. As with any used precision reference standard, it is good practice to verify the actual bore against a calibrated instrument before committing it to a critical inspection role; if your application demands full traceability, have it re-certified by a NATA-accredited laboratory. For most toolroom and production floor zeroing tasks, the ring should perform as intended straight from the box.
Included:
- 1 x SK Setting Ring, 30mm nominal, -D 0009 actual deviation
- 1 x Original green SK packaging / box
Not included: Calibration certificate (original certificate, if issued, is not present — re-certification available through a NATA-accredited metrology lab if required).
Brand Information
SK (Shin Nippon Kogyo Co., Ltd.) is a long-established Japanese precision tool manufacturer headquartered in Tokyo, producing a comprehensive range of metrology and hand tools including micrometers, dial gauges, setting rings, and squares to JIS standards. SK sits comfortably alongside Mitutoyo and RSK in the upper tier of Japanese industrial metrology — tools built to toolroom tolerances, not catalogue approximations. Japanese-made precision standards of this type are well regarded globally for consistent manufacturing quality, and SK’s setting rings in particular are a recognised standard in Japanese automotive and aerospace supplier facilities.
Specifications
| Feature | Specification |
|---|---|
| Brand | SK (Shin Nippon Kogyo) |
| Model / Part Number | MCQ008 (as stamped on ring face) |
| Type | Setting Ring / Internal Reference Standard |
| Nominal Size | 30mm (呼 30) |
| Actual Deviation | -D 0009 (stamped on face — bore ground to a controlled minus deviation from 30mm nominal) |
| Standard | JIS B 7420 (Japanese Industrial Standard for setting rings) |
| Material / Construction | Hardened steel, precision-ground and lapped bore |
| Country of Origin | Japan |
| Condition | Used — Good Condition |
| Included Items | Setting ring, original SK box / packaging |
| Not Included | Calibration certificate |
Keywords
SK setting ring 30mm, SK MCQ008, SK precision setting ring, bore gauge setting ring 30mm, internal reference standard 30mm, JIS setting ring, bore gauge zero setting, toolroom bore standard, precision setting ring Australia, bore micrometer reference, Holtest setting ring, metrology standard Japan
