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Pulley, Metal, Double
Pulley, Metal, Double (Product Code: SLE/PHY/276) is a tandem metal pulley block with 50 mm and 38 mm wheels, used to build block-and-tackle systems and study mechanical advantage in school physics. Its open-sided frame, with a hook at each end, lets students string it up quickly without any threading, and both pulleys run on ball bearings. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Arrangement | Tandem metal pulleys |
| Type | Double |
| Pulley diameters | 50 mm and 38 mm |
| Bearings | Ball bearings |
| Frame | Open-sided, with hooks at each end |
| Stringing | Quick and easy; no threading involved |
| Product code | SLE/PHY/276 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Double Metal Pulley Used For?
Paired with a single pulley or a second double block, it forms a pulley system in which the load is shared between several string segments. Students measure the effort, the load and the distances each one moves, then calculate mechanical advantage, velocity ratio and efficiency. With two wheels in one block, a group can rig systems with a higher velocity ratio than single pulleys allow, and the ball bearings keep frictional losses small so efficiency figures stay realistic.
The open-sided frame is the practical advantage in class: the string is simply laid over each wheel instead of being threaded through, so groups can change from one arrangement to another in moments. Hang the block from a firm support by its top hook, attach loads to the bottom hook, and keep the string seated in the grooves as masses are added. It is a flexible pulley system for the school lab.
What to Specify When Ordering
- Number of double blocks, plus single pulleys if you plan block-and-tackle systems.
- Slotted masses and hangers for the load, and a spring balance for measuring effort.
- Stands or a support frame to hang the pulleys from.
OEM Manufacturer
Jain Scientific Equipments Private Limited trades as ScienceLab and is the OEM of the Pulley, Metal, Double, which it makes at its own licensed factory at Saha, Ambala, Haryana, India. The company (CIN U29309HR2020PTC087597) produces its mechanics apparatus at these premises under Factory Licence AMB-ONLINE-CHD-J-414 and supplies schools, colleges, dealers and importers directly. Additional pulley blocks, or matching single pulleys for an existing set, can be ordered from the manufacturer; just ask us. See our company profile.
Related Laboratory Equipment
Pulleys and accessories for complete pulley-system experiments:
- Pulley, Metal, Double, Parallel — two 50 mm wheels in a metal frame for a different block arrangement.
- Pulley, Metal, Single, Parallel — a single metal pulley to combine with this block.
- Pulley, Plastic Double, with Ball Bearings — a plastic in-line alternative with the same open-sided frame.
- Slotted Mass Hanger, 500g — the load for the bottom hook.
- Force Meter/Spring Balance — measures the effort needed to raise the load.
The Physics Lab Equipment category lists the full pulley range.
Frequently Asked Questions
What sizes are the pulleys in the Pulley, Metal, Double?
The Pulley, Metal, Double carries two metal pulleys in tandem, one 50 mm and one 38 mm in diameter. Both run on ball bearings inside an open-sided frame that has a hook at each end for hanging the block and attaching a load.
What is the advantage of the open-sided frame?
The open-sided frame of the Pulley, Metal, Double lets the string be laid over the wheels instead of threaded through the frame, so students can string up or change a pulley arrangement quickly during a practical lesson.
How is the Pulley, Metal, Double used to show mechanical advantage?
Hang the Pulley, Metal, Double from a support, combine it with a single or second double pulley, and lift a known load with a spring balance. Comparing effort with load, and string pulled with load raised, gives mechanical advantage, velocity ratio and efficiency.
How is the Pulley, Metal, Double different from the parallel version?
The Pulley, Metal, Double has 50 mm and 38 mm pulleys in tandem inside an open-sided frame, while the Pulley, Metal, Double, Parallel has two 50 mm wheels mounted in a metal frame with two hooks. Both build multi-string pulley systems.
Who manufactures the Pulley, Metal, Double?
The Pulley, Metal, Double is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its licensed factory at Saha, Ambala, Haryana, India, and is supplied directly to schools, colleges, dealers and importers in India and international markets.
What should I include when requesting a quote for the Pulley, Metal, Double?
For the Pulley, Metal, Double, give the product code SLE/PHY/276, the number of pulley blocks, any single pulleys, masses or spring balances needed, and the delivery location. Send the details through the contact page or add the items to the enquiry cart.
Request a Quote
Get a Pulley, Metal, Double quotation straight from the manufacturer by writing through our contact page, or place the block and its accessories in the enquiry cart.
Last updated: 24 September 2026
