One Way Key Manufacturer,Supplier and Exporter in India

One Way Key (Product Code: SCL-353/075) is a plug key used to open and close a single electric circuit in school and college physics practicals. It has two brass blocks with 4 mm terminals on a moulded plastic base, and one accurately tapered brass plug with a fluted plastic top bridges the gap between them with negligible contact resistance. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.

Specifications

What Is the One Way Key Used For?

The one way key acts as the on/off switch in nearly every current-electricity practical, from Ohm's law and meter bridge circuits to potentiometer driver circuits. Inserting the plug completes the circuit; removing it breaks the circuit so that no current flows while connections are being changed.

Good practice is to insert the key only while taking a reading and remove it straight afterwards, which stops cells running down and resistance wires heating up. Give the plug a slight twist as it goes in for a firm seat, and keep the tapered surfaces clean. It is a basic item among the physics lab instruments on a student bench.

OEM Manufacturer

Jain Scientific Equipments Private Limited, which sells under the ScienceLab name, is the OEM of this one way key and produces it at the company's own licensed factory at Saha, Ambala, Haryana, India. Plug keys are usually ordered in bench quantities, and buying factory-direct keeps supply and repeat orders straightforward; spare plugs can be requested straight from the manufacturer. The company profile explains more.

Related Physics Lab Equipment

Switching a simple cell circuit calls for a few companion items:

• Two Way Key — for switching a common point between two circuits.
• Contact Key (Push Switch) — a momentary alternative that closes only while pressed.
• Leclanche Cell — a cell to power the circuit being switched.
• Banana Plug Connectors Leads — 4 mm leads for the key's terminals.

Find other circuit accessories in the Physics Lab category.

Frequently Asked Questions

What does the One Way Key include?
The One Way Key has two brass blocks, each fitted with a 4 mm bakelite terminal and mounted on a moulded plastic base, plus one accurately tapered brass plug with a fluted plastic top that fits the hole between the blocks.

How does the One Way Key make good electrical contact?
The tapered brass plug of the One Way Key wedges firmly into the matching hole between the two brass blocks, giving negligible contact resistance. A slight twist while inserting it keeps the contact reliable throughout a practical session.

When should a one way key be used instead of a two way key?
Use the One Way Key when a single circuit needs to be switched on and off, such as a cell and resistance loop. A two way key is chosen when one common point must be connected to either of two circuits, as when comparing two cells.

Who manufactures the One Way Key?
The One Way Key is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own licensed factory in Saha, Ambala, Haryana, India. Schools and dealers buying keys in bench quantities deal directly with the manufacturer.

Which leads fit the One Way Key terminals?
The 4 mm terminals on the One Way Key accept standard 4 mm banana-plug leads, the same connector used on many laboratory meters and resistance boxes. This lets students connect the key into circuits quickly without loose wire joints.

Can the One Way Key be supplied in bulk?
Yes, the One Way Key can be supplied in bulk for school, college and dealer orders in India and international markets. Tell us the quantity and delivery location through the contact page, and the manufacturer will prepare a quotation.

Request a Quote

Order the One Way Key by sending your quantity through the contact page or adding it to the enquiry cart. Quotations come directly from the factory.

Last updated: 24 September 2026