Pulley, Inline Triple
Product Code : LSK-PL-10368
Pulley, Inline Triple (SKU LSK-PL-10368) is a three-wheel pulley block carrying 25, 38 and 50 mm pulleys on ball bearings in an open-sided frame with a hook at each end. With three wheels in one block, students can rig pulley systems with more supporting strands than a single or double block allows. It suits machines practicals in school and college mechanics. Science Lab Supplies assembles the triple block in its own manufacturing unit at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and quotes it directly to schools, colleges, tender contractors and distributors.
Specifications
The three wheel diameters, bearings and frame details of the triple block take one row each. In short, pulleys of 25, 38 and 50 mm sit in line on ball bearings inside an open-sided frame with a hook at each end, and the open side lets string be placed over each wheel without threading.
| Specification | Value |
|---|---|
| SKU | LSK-PL-10368 |
| Number of pulleys | 3, in line |
| Pulley 1 diameter | 25 mm |
| Pulley 2 diameter | 38 mm |
| Pulley 3 diameter | 50 mm |
| Bearings | Ball bearings |
| Frame | Open-sided |
| Hooks | 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 Triple Pulley
Used as the moving or fixed block of a block and tackle, the triple pulley lets students build systems with up to six supporting string segments when paired with a second triple block. They can then compare measured and theoretical mechanical advantage in the machines chapter of ICSE Class 10 physics.
- ICSE Class 10 physics (machines): velocity ratio equal to the number of supporting strands, and efficiency, with effort read on the 1 to 20 N Set of Spring Force Meters with Different Ranges.
- Comparing single, double and triple pulley systems for the same load, built up from enamelled carbon-steel discs of the Laboratory Slotted Masses, 2.5 kg.
- Engineering-foundation and college mechanics: effect of friction and pulley weight on efficiency.
Standard Scope of Supply
Each Pulley, Inline Triple is supplied as one block: the open-sided frame with hooks at both ends, carrying 25, 38 and 50 mm pulleys on ball bearings. String, masses and a support for the system can be added as separate lines on the same quotation.
Packing, MOQ and Lead Time
Whether you need one triple block or a matched pair for each practical group, the quotation will set out packing, delivery time and price for that number. Fixed pulleys, an Atwood machine or mass sets can join the same quotation.
Science Lab Supplies can ship to buyers in the UAE, Saudi Arabia, Oman, the Philippines, Nepal and Bangladesh as a registered exporter holding an Importer-Exporter Code. The business is registered under Udyam as a manufacturing enterprise (UDYAM-HR-01-0014546) and for GST (GSTIN 06ADEPJ0574F2ZU). Single blocks or matched pairs can be asked for on the contact page or saved in the enquiry cart, and the lab tender page handles tender-based orders.
Frequently Asked Questions
What are the three pulley sizes?
The block holds pulleys of 25, 38 and 50 mm diameter, each running on ball bearings in one open-sided frame with a hook at each end for hanging the block or attaching a load.
How is it different from the inline double pulley?
The Pulley, Inline Double carries two pulleys of 38 and 50 mm. The triple adds a 25 mm wheel, so a system built with it can have more supporting strands.
Does the string need threading through the frame?
No. The open-sided frame allows quick and easy stringing, because the string is laid over each pulley rather than threaded through, so arrangements can be changed during a practical.
Is the triple pulley made by Science Lab Supplies or bought in?
It is made in-house: the three ball-bearing wheels are fitted into the open frame at the company’s Saha, Ambala, India factory, which also prepares the quotation, with no trader involved.
Related Mechanics Apparatus
A triple block is used with a second pulley and a set of masses, and pulley work extends to an Atwood machine and a force table. These Physics Lab and Applied Mechanics items extend pulley practicals, and any of them can be quoted together with the triple block.
- Pulley, Inline Double — 38 and 50 mm ball-bearing pulleys in an open-sided frame.
- Fixed Pulley — cast metal pulley with hooks at the top and bottom of the frame.
- Pulley on Rod with Clamp — 50 mm aluminium pulley on a sliding rod with C-clamp base.
- Atwood Machine — friction-minimised pulley with table clamp and multi-clamp.
- Wooden Machine Pulley Model — particle-board model 16¼ in tall with three pulleys.
- Universal Force Table — 40 cm graduated disc with four sliding clamp pulleys.
- Mass Set with Hangers — two each of 10, 20, 50 and 200 g plus 100, 500 and 1000 g.
Browse the full Physics Lab range, the Applied Mechanics range, or all physics lab equipment.
Last updated: 22 October 2026
