Proving Rings Manufacturer,Supplier and Exporter in India
Product Code : EL-CACTE-9452
Jlab Export is a leading Proving Rings Manufacturer,and suppliers in India
A proving ring is a forged steel ring that deflects in direct proportion to the load on it, so it can measure or check a load. A dial gauge reading 0.002 mm per division shows the deflection. Each ring comes with its dial gauge, a pair of loading pads and a works calibration chart, packed in a polished wooden box.
Specifications
| Ring material | Special steel, forged |
| Deflection | Directly proportional to applied load |
| Dial gauge sensitivity | 0.002 mm per division |
| Dial mounting | Dial gauge and anvil on U-brackets clamped by set screws |
| Loading pads | Separate pair to suit each ring |
| Supplied with | Dial gauge and works calibration chart |
| Packing | Individual polished wooden box |
| Capacities | 1–100 kN and 1–2000 kN |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 7–10 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Proving Ring Experiments and Calibration Work
The classic exercise is checking a testing machine. Students place the ring between the platens of a Compression Testing Machine for Concrete, apply load in steps and read the dial at each one. Load equals the ring constant k times the deflection, taken from the calibration chart, and is compared with the machine gauge.
The same check can be run on a Universal Testing Machine in compression. Students also plot load against deflection to show the straight-line response of an elastic ring. In soil labs, proving rings are the load-measuring part of many test frames, such as CBR and direct shear set-ups.
Frequently Asked Questions
How is the load worked out from the dial reading?
Multiply the dial divisions by 0.002 mm to get the deflection, then convert it to load with the calibration chart supplied with the ring. Because deflection is proportional to load, the chart is a straight line, often given as a constant k in kN per mm.
Which capacity ring should I choose?
Choose a ring whose capacity is a little above the highest load you need to read, so working loads use most of the dial travel. A ring far larger than the load gives only a few divisions and a coarse reading.
What are the loading pads for?
The pair of pads seats the ring squarely between the platens or loading points. Each ring has its own pads, so keep them with it and use them every time it is loaded.
How do you zero the dial before a test?
With the ring unloaded and seated on its pads, turn the dial bezel until the pointer reads zero. Apply and remove a small load once or twice, then check that the pointer returns to zero before taking readings.
How should a proving ring be stored?
Keep it in its wooden box with the dial gauge fitted, away from knocks and damp. Never load it past its rated capacity, because overloading can bend the ring and change its calibration.
Machines and Gauges Used with Proving Rings
- Cube Testing Machine
- Compression Testing Machine Digital
- Dial Gauge (magnetic base)
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Last updated: 5 November 2026
