Mechanical Spring Balance

Quick Answer: The Mechanical Spring Balance is a hanging force-measuring instrument that determines the weight or pulling force of a suspended load by reading how far an internal spring stretches against a graduated scale. It is a simple, visual way to teach force, weight and elastic extension without any electronics.

Description

This spring balance works by suspending the load directly from a hook, letting the internal spring extend under the pull of gravity (or any applied force). As the spring stretches within its calibrated operating range, an indicator moves along a graduated scale, and the reading is taken once the load has settled and the balance is hanging vertically and steadily. This hanging format makes it especially suited to demonstrating the relationship between force, mass and gravity in a very visual way — students can see the spring extend proportionally as heavier loads are attached, reinforcing Hooke’s Law and the concept of elastic extension. It differs in format from a platform-style spring balance such as our Cylindrical Spring Weighing Balance, which uses a cylindrical housing rather than a hanging hook-and-scale design, making this instrument better suited to experiments where a load needs to be suspended freely (such as measuring the weight of an object on a string, or checking the pulling force needed to move something).

Specifications

Care & Maintenance

• Never exceed the balance’s rated maximum capacity, as overloading can permanently stretch or damage the internal spring and cause inaccurate readings.
• Always let the load settle and hang steadily and vertically before taking a reading.
• Store hanging or lying flat in a way that avoids the spring being left under sustained tension.
• Keep the scale window clean and free of dust for a clear reading.
• Avoid sudden jerking or dropping loads onto the hook, as shock loading can damage the spring mechanism.
• Periodically check the zero reading with no load attached and note any offset.

Why Choose LabEquip

LabEquip supplies a range of force and mass measurement instruments for physics laboratories. If your practicals also need a platform-style weighing format, our Cylindrical Spring Weighing Balance is a useful complement, and our Brass Analytical Weight Set (1mg-100g) supports mass comparison work. Browse our full Measuring Instruments range, or contact our team to confirm the exact capacity for your requirement.

Frequently Asked Questions

How does this spring balance work?
A load is suspended from a hook, which stretches an internal spring; the extension moves an indicator along a graduated scale, and the force/weight is read once the load hangs steadily.

What is the maximum load it can measure?
The maximum capacity depends on the specific model. Please confirm the capacity you require with our sales team.

How is this different from the Cylindrical Spring Weighing Balance?
This is a hanging, hook-and-scale design for suspended loads, while the Cylindrical Spring Weighing Balance uses a cylindrical housing/platform format — the two suit different types of experiments.

What physics concepts does it help teach?
It is commonly used to demonstrate force, weight, gravity and Hooke’s Law (the proportional relationship between spring extension and applied force).

Does it need batteries?
No, it is a fully mechanical instrument read directly from its graduated scale.

How should I avoid damaging the spring?
Never exceed the rated maximum capacity, avoid sudden jerking or dropping loads onto the hook, and avoid storing it under sustained tension.

Last Updated: September 2026