Faithfull Internal Spring Caliper - 100mm (4in)
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Product Information
Full details
The Faithfull Internal Spring Caliper is designed for metalworkers, woodworkers, and DIY enthusiasts who require high-precision internal measurements for their projects. Its primary benefit is the combination of a robust, balanced steel construction with a smooth adjustment mechanism, allowing for consistent and repeatable readings. The main caveat is that, as a traditional manual tool, it requires a steady hand and a separate measuring scale to convert the caliper's gap into a numerical value.
All features
| Model Part Number | 1240285 |
|---|---|
| Brand | Faithfull |
Extended Product Information
FAQs
Does this tool provide a digital readout?
No, this is a traditional manual tool. You must use a separate measuring device to read the distance between the points.
What is the maximum internal dimension this can measure?
The caliper is rated for a 100mm (4-inch) capacity.
Are the tips hardened?
Yes, the points are treated to ensure durability and accuracy during repeated use.
Can this be used for external measurements?
No, this model is specifically designed for internal measurements. External spring calipers are required for outer diameter readings.
Is this tool suitable for professional workshop use?
Yes, its solid steel construction and reliable adjustment mechanism make it well-suited for professional, educational, and hobbyist workshops.
Troubleshooting
Adjustment screw feels stiff or jerky
Clean the threads of the adjustment screw with a soft brush and apply a very light coat of machine oil.
Caliper legs shift during measurement
Ensure the bow spring has not been deformed; check that the adjustment nut is seated correctly in its housing.
Surface oxidation or rust spots appearing
Gently remove light rust with fine-grit abrasive cloth and apply a protective oil coating immediately.
Pros and Cons
Pros
- Durable all-steel construction
- Smooth and predictable adjustment action
- Compact size perfect for tight spaces
- Excellent value for precision mechanical measuring
Cons
- Requires manual calibration against a separate ruler or micrometer
- Natural steel finish may require oiling to prevent oxidation
- Not intended for heavy-duty prying or force
Setup, Compatibility & Care
To ensure the longevity of your Faithfull caliper, follow these best practices:
- Initial Setup: Clean the tool thoroughly before first use to remove any factory protective grease.
- Calibration: Use a high-quality, certified steel rule to verify your zero or set your desired measurement.
- Compatibility: This tool is designed for manual measurement and pairs best with precision rules or feeler gauges.
- Care & Maintenance: Because the legs are natural steel, wipe them down with a light machine oil after each use if you are working in a humid shop environment to prevent surface rust. Store in a clean, dry toolbox to avoid damaging the precision-treated points.