# Checking Fixtures & Go/No-Go Gauges

> Checking fixtures and go/no-go gauges must be designed around the product datum scheme and the measurement decision they make. The RFQ should state the master part or CAD authority, gauge limits, wear allowance, contact material, operator sequence, calibration features and required correlation report.

- Market: mold-tooling
- HTML page: https://fabvector.com/solutions/checking-fixtures-go-no-go-gauges (Portuguese: https://fabvector.com/pt/solutions/checking-fixtures-go-no-go-gauges)
- Industry hub: https://fabvector.com/industries/mold-tooling
- Quote: https://fabvector.com/quote

## Components and applications

- Attribute checking fixtures
- Go/no-go plug and snap gauges
- Assembly-position gauges
- Master and correlation fixtures

## Recommended manufacturing route

1. Translate product datums and decision limits into the gauge concept.
2. Machine the base, locators and replaceable contacts.
3. Harden and grind gauge features where required.
4. Calibrate or correlate to the specified master and report format.

## Drawing and RFQ controls

| Control | Guidance |
|---|---|
| Gauge limits | Define wear allowance and whether limits include measurement uncertainty. |
| Datum simulation | Match the product drawing datum precedence without over-constraining the part. |
| Calibration access | Provide features that can be measured and reset through the gauge life. |

## Recommended materials

- [tool-steel-a2](https://fabvector.com/md/materials/tool-steel-a2): Stable hardened gauge contacts and pins.
- [tool-steel-d2](https://fabvector.com/md/materials/tool-steel-d2): High-wear gauge elements.
- [aluminum-mic-6](https://fabvector.com/md/materials/aluminum-mic-6): Stable fixture bases and plates.

## Related manufacturing processes

- [cnc-milling](https://fabvector.com/md/services/cnc-milling)
- [cnc-turning](https://fabvector.com/md/services/cnc-turning)
- [surface-grinding](https://fabvector.com/md/services/surface-grinding)
- [wire-edm](https://fabvector.com/md/services/wire-edm)

## Compatible finishes

- [hardcoat-anodizing-type-iii](https://fabvector.com/md/finishes/hardcoat-anodizing-type-iii)
- [black-oxide](https://fabvector.com/md/finishes/black-oxide)
- [electroless-nickel-plating](https://fabvector.com/md/finishes/electroless-nickel-plating)

## Inspection to define before production

- Traceable dimensional calibration report when included
- Master-part or CMM correlation results
- Serialized BOM, wear components and reset instructions

## Standards and documentation scope

- **Customer gauge standard**: Gauge design, uncertainty and calibration interval follow the supplied standard.
- **ISO/IEC 17025 interface**: Accredited calibration is a separately confirmed scope, not implied by machining.

## Buyer questions, answered

### What is needed to quote a go/no-go gauge?

Provide the controlled product drawing, gauge type, limits, wear allowance, material and hardness, handle or holder standard, quantity and calibration requirement.

### Is accredited calibration included with gauge machining?

Not automatically. State whether a dimensional report, master correlation or accredited certificate is required so the route and external scope can be confirmed before order.

## Related engineering guides

- [Jigs, fixtures and tooling guide](https://fabvector.com/custom-cnc-parts/cnc-machined-jigs-fixtures)
- [Inspection and documentation options](https://fabvector.com/quality)