In automotive checking fixtures, when external reference surfaces are limited or inaccessible, the special inner reference bush becomes a critical solution.
From a user’s perspective, this component defines how accurately an internal datum can be established, protected, and repeatedly referenced during inspection.
Gooding manufactures special inner reference bushes specifically for automotive checking and inspection fixtures, providing stable internal reference points for high-precision dimensional control.

Why Special Inner Reference Bushes Are Essential in Real Fixture Use

In practical fixture applications, engineers often face situations such as:

• Internal holes used as primary or secondary datums

• Limited access for external reference surfaces

• High requirements for coaxiality and positional accuracy

• Need to protect critical datum holes from wear

In these cases, a special inner reference bush allows users to:

• Define a precise internal reference axis

• Guide measuring pins or gauges accurately

• Prevent wear or deformation of the original datum feature

For users, the requirement is clear:
     The internal reference must remain accurate and unchanged throughout the fixture’s lifetime. 

Gooding Special Inner Reference Bush Manufacturing Advantages

✔ Designed for Internal Datum Control

Gooding inner reference bushes are engineered specifically for:

• Internal hole-based datum systems

• High-precision locating and detecting applications

• Automotive checking fixture reference strategies

This ensures reliable alignment and repeatable measurement results.

✔ High-Precision Inner Bore Machining

We strictly control:

• Inner diameter tolerance

• Roundness and cylindricity

• Coaxiality between inner bore and outer profile

to guarantee accurate internal referencing and smooth pin guidance.

✔ Hardened & Wear-Resistant Steel Materials

Manufactured from high-quality steel with optional heat treatment, our inner reference bushes offer:

• Excellent wear resistance

• Long-term dimensional stability

• Reduced need for recalibration or replacement

✔ Custom Geometry for Complex Fixture Designs

Gooding supports full customization, including:

• Special inner bore profiles

• Stepped or flanged outer designs

• Irregular or anti-rotation outer shapes

• Integration with pin seats or fixture plates

Each bush is tailored to the specific fixture and reference requirement.

✔ Reliable Performance in High-Frequency Inspection

Designed for repeated insertion of reference pins or gauges, these bushes maintain consistent performance even under high-cycle inspection conditions.