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 can be 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. The double block is manufactured on the Science Lab Supplies factory floor at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and quoted from there to schools, colleges, tender contractors and distributors.
Specifications
Wheel sizes, bearings and frame of the two-wheel inline block are given in separate rows. In short, 38 mm and 50 mm pulleys run 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 avoids threading the string.
| Specification | Value |
|---|---|
| SKU | LSK-PL-10367 |
| Number of pulleys | 2, in line |
| Larger pulley diameter | 50 mm |
| Smaller pulley diameter | 38 mm |
| Bearings | Ball bearings |
| Frame | Open-sided |
| Hooks | One at each end |
| Stringing | Quick and easy, no threading involved |
| 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, with effort read on a Digital Force Meter of 0.1 to 20 N.
- Middle-school science: comparing a single fixed pulley with a two-pulley arrangement and with the Inclined Plane, Economy as another simple machine.
- 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 can be added as further lines on the same 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, so a whole pulley bench can be priced at once.
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. Pulley blocks for each group can be requested in a short message on the contact page or as lines in the enquiry cart; buyers working through a tender can turn to the lab tender page.
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 with a hook at each end for hanging or loading.
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 and easy during a lesson.
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. Frame, hooks and ball-bearing wheels are put together at the company’s Saha, Ambala, India factory, and as the maker rather than a trader, Science Lab Supplies quotes the block 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 Physics Lab items complete a pulley system, from a triple block and fixed pulley to an Atwood machine and a magnetic mechanics kit, and can go on one quotation with the double pulley.
- Pulley, Inline Triple — three ball-bearing pulleys of 25, 38 and 50 mm.
- Fixed Pulley — low-friction cast metal pulley with a deep V-groove.
- Pulley on Rod with Clamp — grooved 50 mm pulley held in a table clamp by a screw.
- Atwood Machine — stainless-steel support rods, braided cord and a slotted mass set.
- Wooden Machine Pulley Model — three pulleys on a wooden base with string and manual.
- Complete Mechanics Kit — magnetic pulleys, 2 N dial force gauges and hook weights.
- Mass Set with Hangers — rugged steel masses from 10 g to 1000 g.
Browse the full Physics Lab range, the Applied Mechanics range, or all physics lab equipment.
Last updated: 22 October 2026
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