The Kozelo Spring Joint Caliper is a spring joint caliper for metalworking that transfers internal sizes and scribes precise circles. Sturdy carbon steel construction gives confidence during layout work and repeated use. Is the 12-inch reach and hardened-point design right for your workshop marking tasks?
⚡ At a Glance
- • Marking Precision: Hardened high-carbon steel points and adjustable solid nut enable fine, repeatable scribing
- • Best for: Metalworkers and machinists transferring internal measurements and laying out circles
- • Not ideal for: Tasks that require digital readouts or micrometre-level measurement accuracy
A 12-inch spring joint caliper made from heat-treated carbon steel with hardened points. The solid nut allows secure, repeatable markings and accurate internal size transfers.
Precise scribing – With hardened high-carbon steel points
Hardened points create a fine, durable scribe on metal while the spring joint keeps leg tension steady. The legs are heat-treated to increase hardness and wear resistance under repeated use.
Fine, repeatable marks allow accurate layout of holes and circles without slipping during scribing.
Stable measurements – Thanks to the solid adjusting nut
A solid nut secures leg spacing after adjustment so the setting resists movement during marking. The spring joint maintains consistent pressure to reduce variation between marks.
Locked settings make internal size transfers reliable and cut down the need for repeated checks.
Workshop-ready durability – With heat-treated carbon steel construction
Carbon steel subjected to heat treatment increases surface hardness and wear resistance across the legs. Flat leg design helps maintain contact with flat workpieces for cleaner scribing.
Robust build suits regular shop use and helps the tool remain accurate over time.
✨ The 4 Key Reasons for Kozelo Spring Joint Caliper
- Flat leg design - Scribe close to edges and flat surfaces for neater layout work
- Spring joint mechanism - Maintains steady tension for even marking pressure each use
- 12-inch maximum opening - Reach larger stock and lay out bigger circles without shifting
- Simple mechanical operation - No batteries or calibration, works reliably in workshop conditions
📋 Technical Details at a Glance
- Category: Spring joint caliper
- Brand: Kozelo
- Material: Carbon steel, heat-treated
- Max opening: 12 inch (maximum open length)
- Leg design: Flat leg
❓ Frequently Asked Questions
Q: What is the caliper best used for?
A: Measuring and transferring internal sizes on round or irregular stock, scribing circles and arcs, and general layout and drafting work for metalworking.
Q: What material is the tool made from and is it durable?
A: Made of carbon steel with heat treatment to increase hardness and wear resistance; user feedback highlights sturdy, durable construction suited to workshop use.
Q: How can I ensure accurate measurements with the caliper?
A: Ensure the object being measured is stable, using clamps or other secure methods, and lock the leg spacing with the solid nut before scribing or transferring dimensions.
🏆 Our Verdict
Ideal for metalworkers, machinists and hobbyists who need a simple, mechanical tool for layout and internal-size transfers. Hardened points, a solid adjusting nut and heat-treated carbon steel combine for reliable, repeatable scribing and robust workshop use. The straightforward, durable design gives long-term value for routine marking tasks.
