Open Spanner Manufacturer,Supplier and Exporter in India
Product Code : EL-MWLE-9283
Jlab Export is a leading Open Spanner Manufacturer,and suppliers in India
An open spanner has a fixed, open jaw that slides onto the flats of a nut or bolt head from the side. It is made in sizes from 6 to 50 mm, in carbon steel or chrome vanadium steel. Finishes run from fully polished chrome and satin to coloured lacquer and black phosphate, and the patterns include cold coin stamped, elliptical and recessed panel.
Specifications
| Sizes | 6–50 mm |
| Material | Carbon steel or chrome vanadium steel |
| Finish options | Polished heads, fully polished chrome, satin, coloured lacquer, black phosphate |
| Patterns | Cold coin stamped, elliptical, recessed panel |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Fitting and Assembly Practicals
In a refrigeration lab, students make flare joints on copper tube and tighten the brass nuts from the Flare Fitting Set. An open spanner suits this job because its jaw slips onto the nut from the side while the tube runs through it. A second spanner holds the fitting body so the tube is not twisted.
In the fitting shop, students bolt together a small frame from Angle Iron drilled on the Drill Press. Teachers use the job to show how an open jaw is flipped over to take a fresh grip in a tight space. For the final tightening, a ring from the Box End Spanner Set grips the nut all round and slips less.
Frequently Asked Questions
How do I pick the right size?
The size is measured across the flats of a hex in millimetres, so a 10 mm spanner fits a hex 10 mm across. This range runs from 6 to 50 mm, from small machine screws up to large bolts on machinery and pipework.
Carbon steel or chrome vanadium: which should I choose?
Carbon steel spanners suit general bench work and student training. Chrome vanadium is an alloy steel, usually chosen for heavier everyday use in maintenance shops.
What do the finish options mean?
Polished or satin chrome gives a bright surface that is easy to wipe clean. Black phosphate is a dull grey-black coating that holds a thin film of oil against rust. Coloured lacquer is a painted coat over the steel.
Can it be used on a flare nut or a pipe union?
Yes. The open jaw passes over the tube and onto the flats of the nut, which a closed ring cannot do. Use the exact size so the soft brass corners are not rounded off.
How do I avoid rounding off a nut?
Push the jaw fully onto the flats so the nut sits deep in the opening and not at the tips. Turn it with a steady pull. If the nut is seized, free it with penetrating oil or use a ring spanner before applying more force.
Other Spanners and Wrenches
- Open End Spanner Set (metric set of eleven)
- Double Ended Spanner (ring ends)
- Combination Spanner Set (inch sizes)
- Adjustable Wrench Set
For a quote, use Add To Cart or send us a message through the contact page.
Last updated: 5 November 2026
