Pulley, Inline Double
Product Code : LSK-PL-10367
Pulley, Inline Double (SKU LSK-PL-10367) is a two-pulley block with wheels of 38 and 50 mm diameter running on ball bearings in an open-sided frame, with a hook at each end. It is used to build block-and-tackle arrangements that show how pulley systems trade effort for distance. It suits machine experiments in secondary school and college mechanics. Manufacturing takes place at the Science Lab Supplies factory, Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and the company supplies it directly to schools, colleges, tender contractors and distributors.
Specifications
Two pulleys, 38 mm and 50 mm in diameter, are carried in line on ball bearings inside an open-sided frame. Hooks at both ends let the block hang from a support or carry a load, and the open side means string can be laid over the wheels without threading it through.
| Parameter | Value |
|---|---|
| SKU | LSK-PL-10367 |
| Number of pulleys | 2, in line |
| Pulley diameters | 38 mm and 50 mm |
| Bearings | Ball bearings |
| Frame | Open-sided, hook at each end |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Inline Double Pulley
Paired with a second block or a fixed pulley, the double block forms a pulley system with several supporting string segments, so students can measure load, effort and distances moved. It supports the machines chapter of ICSE Class 10 physics and simple-machine work in school and college mechanics labs.
- ICSE Class 10 physics (machines): mechanical advantage, velocity ratio and efficiency of a block and tackle.
- Middle-school science: comparing a single fixed pulley with a two-pulley arrangement.
- College mechanics: investigating how friction in the system lowers efficiency below the ideal value.
Because the frame is open-sided, the string can be changed between arrangements quickly, which keeps practical time for measurement.
Standard Scope of Supply
The Pulley, Inline Double is supplied as a single block: an open-sided frame with hooks at each end carrying the 38 mm and 50 mm ball-bearing pulleys. String, masses and a support stand are separate items for the quotation.
Packing, MOQ and Lead Time
Quotations can be made for one double pulley or for several to equip each group, together with triple or fixed pulleys if needed. Each one gives packing, delivery time and price for the quantity requested.
Science Lab Supplies is a registered exporter with an Importer-Exporter Code, able to ship to buyers in Uganda, the UAE, Saudi Arabia, Oman, the Philippines and Nepal. Contact the team on the contact page, compile items in the enquiry cart, or refer to the lab tender page for tenders.
Frequently Asked Questions
What sizes are the two pulleys?
The block carries one 38 mm and one 50 mm pulley, both running on ball bearings in an open-sided frame.
Why is the frame open on one side?
The open side lets you lay the string over the pulleys instead of threading it, so setting up or changing a pulley system is quick.
How does it differ from the inline triple pulley?
The Pulley, Inline Triple has three pulleys of 25, 38 and 50 mm in the same open-sided, hooked frame. The double version has two pulleys, 38 and 50 mm.
Is Science Lab Supplies the producer of this pulley block?
It is. The block is manufactured at the company's Saha, Ambala, India factory, and as the maker rather than a trader, Science Lab Supplies quotes it directly.
Related Pulley Apparatus
A double block works together with other pulleys, a clamp to hold the system and hanging masses to load it. These four items from the same physics range complete a pulley system and can go on one quotation with the double pulley.
- Pulley, Inline Triple — three ball-bearing pulleys of 25, 38 and 50 mm.
- Wooden Machine Pulley Model — three pulleys on a wooden base with manual.
- Pulley on Rod with Clamp — 50 mm pulley on a rod with table clamp.
- Mass Set with Hangers — steel masses from 10 g to 1000 g.
Browse the full Physics Lab range or all physics lab equipment.
Last updated: 25 September 2026
