Engineering measuring tools aimed at accurate internal and external diameter readings for workshop tasks. Repeatable measurements reduce setup guesswork and speed up jobs such as woodturning and part matching. Is the Hardys Spring Caliper Set precise and durable enough for regular workshop use?
⚡ At a Glance
- • Measurement Accuracy: Accurate to 0.001mm thanks to hardened points and uniform spring tension
- • Best for: Workshop users and hobbyists needing repeatable internal and external measurements
- • Not ideal for: Tasks requiring digital readouts or hands-free measurement recording
Three-piece spring calliper set includes divider, external and internal callipers for a range of measuring tasks. Hardened and tempered bow springs combine with a 2.5" adjustment screw to deliver fine, repeatable adjustments.
Pinpoint repeatability – with hardened points and uniform spring tension
Hardened, heat-treated steel points contact workpieces without deforming, while tempered bow springs supply steady tension to reduce play. A 2.5" (63mm) adjustment screw with a self-seated washer enables fine incremental changes.
Consistent read-offs down to 0.001mm make transferring measurements straightforward, ideal when matching diameters on a lathe or checking mating parts.
Versatile measuring options – with a three-piece set for external, internal and divider tasks
Set contains divider, external calliper and internal calliper, each 7.5" (190mm) long, with maximum spans of 170mm for the divider, 185mm for the internal calliper and 160mm for the external calliper. Points and jaws are shaped to handle odd contours and hole diameters.
Useful across woodworking and light engineering, quickly measure holes, distances and odd shapes without swapping many tools.
Built for workshop wear – with heat-treated construction and tempered springs
Steel heat-treated points resist wear from repeated contact, and tempered bow springs maintain uniform tension over time. The simple screw adjustment reduces backlash compared with friction-only designs.
Durable finish and robust spring action mean the set stays reliable under regular bench and lathe use, so calibration drifts are less likely.
✨ The 4 Key Reasons for Hardys Spring Caliper Set
- Fine adjustment screw — Allows precise 0.001mm fine-tuning for repeatable measurements
- Heat-treated steel points — Resist wear for reliable contact over many uses
- Three-piece configuration — Covers external, internal and divider jobs without extra tools
- Tempered bow springs — Maintain uniform tension to reduce measurement play
📋 Technical Details at a Glance
- Category: Engineering measuring tools
- Brand: Hardys
- Included pieces: Divider calliper, external calliper, internal calliper
- Material / Points: Steel, heat-treated points
- Spring type / Construction: Hardened and tempered bow springs
❓ Frequently Asked Questions
Q: Can the set measure both internal and external diameters?
A: Yes. The three-piece set includes both internal and external callipers plus a divider for measuring diameters and distances.
Q: How fine are the adjustments?
A: Fine adjustments are made with a 2.5" (63mm) screw featuring a self-seated washer, enabling repeatable tuning and readings down to 0.001mm as stated.
Q: Are these suitable for woodturning?
A: User feedback specifically mentions successful use for woodturning, indicating the heat-treated points and stable spring action work well for workshop and lathe tasks.
🏆 Our Verdict
Suitable for workshop users and hobbyists who need reliable internal and external diameter measurements. Hardened, heat-treated points combined with tempered bow springs and a fine adjustment screw deliver repeatable accuracy and robust construction. Built to last for regular bench and lathe work, the set represents good long-term value for workshops.
