How Much Weight Will a 100N Gas Strut Hold? Complete Force Guide
What Does 100 Newtons Actually Mean?
A 100N gas strut produces a constant upward force of 100 Newtons throughout its stroke. One Newton equals approximately 0.102 kilograms of force, which means a 100N gas strut generates roughly 10.2 kg of lifting power. This is straightforward in theory but becomes more complex in real-world applications because the actual weight a gas strut can hold depends on geometry, angle, and where the load sits relative to the hinge point.
100N Force in Kilograms and Pounds
For practical reference:
- 100 Newtons = 10.2 kilograms (kg)
- 100 Newtons = 22.5 pounds (lbs)
- 100 Newtons = 10.2 kilogram-force (kgf)
This conversion is useful when checking product specifications or cross-referencing between UK metric data and US imperial measurements. Most gas struts sold in the UK are rated in Newtons; many US suppliers list both.
How Hinge Position Affects Load Capacity
The distance from the hinge to where the gas strut mounts dramatically changes how much weight it can support. This is a lever principle known as mechanical advantage. A gas strut mounted close to the hinge must generate more force to hold the same load than one mounted further away.
For example, if a lid measures 600 mm from hinge to rear edge, and the gas strut mounts at 500 mm from the hinge, the strut must support roughly twice the actual weight of the lid. If the strut mounts at only 250 mm from the hinge, it must support approximately four times the lid weight. A 100N strut mounted close to the hinge may hold a 2–3 kg lid comfortably, but hold only a 0.5 kg lid if mounted at the extreme end.
Mounting Angle Impact on Load Rating
Gas struts perform optimally when mounted vertically (perpendicular to the surface they are lifting). As the angle increases, the effective lifting force decreases. A gas strut mounted at 45 degrees provides approximately 70% of its rated force. At 60 degrees, it provides roughly 50% of rated force.
For a 100N strut:
- Vertical (0°): 100N effective force
- 30° angle: ~87N effective force
- 45° angle: ~71N effective force
- 60° angle: ~50N effective force
In furniture applications, gas struts rarely mount perfectly vertical, so accounting for angle is critical to avoiding a strut that cannot hold the load throughout the full stroke.
Real-World Weight Holding Examples: 100N Strut
To understand practical load capacity, consider these typical scenarios with a 100N gas strut:
Ottoman Storage Bed with Rear-Mounted Strut
A bed base measuring 900 mm from hinge to back edge, with a 100N strut mounted at 700 mm from the hinge, needs to support a bed platform weighing 8–12 kg. Using the lever calculation, the strut must generate approximately 75N to hold a 10 kg platform in this geometry. A 100N strut provides adequate margin for smooth opening and closing.
Car Boot Lid (Boot is Too Heavy for 100N Alone)
A typical car boot lid weighs 8–15 kg and hinges 200–250 mm from the strut mounting point. A single 100N gas strut cannot support this weight safely. Most vehicles use two gas struts (total 200–300N) or struts rated 150–200N per side. This is why 100N struts rarely appear in automotive applications—the loads are too high.
Kitchen Overhead Cabinet Door
A standard kitchen cabinet door (IKEA, Howdens, B&Q) weighs 3–6 kg. With a hinge-to-strut distance of 350–400 mm and a hinge-to-door-edge distance of 400–500 mm, a 100N strut holds this load comfortably with margin. Most overhead cabinet applications specify 100–150N struts.
Loft Hatch Lid (Attic Access)
A typical loft hatch lid weighs 4–8 kg. Mounted with struts at roughly mid-panel (400–450 mm from hinge), a single 100N strut will hold most loft hatches adequately if installed at a near-vertical angle. Two 100N struts provide stronger support and smoother operation.
The Lever Calculation: How to Find Real Load Capacity
To calculate whether a 100N strut will hold your specific load, use the lever principle:
Required Force = (Load Weight in kg × Distance from Hinge to Load Center) ÷ Distance from Hinge to Strut Mount
Example: A 6 kg cabinet door with the hinge 50 mm from the hinge and strut mounted 300 mm from the hinge:
- Load center (center of mass) ≈ 200 mm from hinge
- Required Force = (6 kg × 200 mm) ÷ 300 mm = 4 kg ≈ 40N
- A 100N strut provides 2.5× safety margin
If the same door weighs 15 kg and you use the same strut:
- Required Force = (15 kg × 200 mm) ÷ 300 mm = 10 kg ≈ 98N
- A 100N strut barely holds it, with minimal margin
Safety Margin and Over-Force Conditions
Engineers typically recommend sizing gas struts with a 20–30% safety margin above calculated requirements. This accounts for:
- Wear over time (gas struts lose force gradually)
- Temperature effects (struts generate less force in cold conditions)
- Friction in hinges and glides (requires additional force)
- Shock loads (users closing lids forcefully, not smoothly)
If a load requires exactly 100N, you should specify a 120–130N strut instead. A 100N strut rated at exactly the load requirement will fail to hold the load safely within 12–24 months.
When a 100N Gas Strut Is the Right Choice
A 100N gas strut is appropriate for:
- Kitchen cabinet doors under 7 kg
- Small loft hatch lids (4–6 kg single strut, or two struts for 6–8 kg)
- Ottoman storage beds with rear mounting and weight under 12 kg per strut
- Small furniture panels, TV lift bases, and desk mechanisms
- Marine hatches and smaller caravan storage lockers under 5 kg
- Industrial machine guards and access panels under 8 kg
When a 100N Strut Is Undersized
A 100N strut will struggle or fail to support:
- Car boot lids (require 150–250N per strut)
- Car bonnet/hood panels (require 150–200N)
- Tailgates on SUVs (require 250–400N per strut)
- Heavy caravan doors (often 250–300N)
- Industrial machinery guards over 12 kg
- Large furniture panels or bed bases over 15 kg
Temperature Effects on 100N Strut Performance
Gas struts lose approximately 5–8% of their force in very cold conditions (-20°C) and gain approximately 3–5% in warm conditions (+40°C). A 100N strut in January UK winters may perform closer to 92–95N. This reinforces the need for safety margin—a strut rated exactly to load will fail in cold weather.
How to Measure if Your Current Strut Is Adequate
If you already have a gas strut installed and want to verify if 100N is sufficient:
- Open the lid or panel fully and hold it open with your hand
- Slowly release your hand and feel how much force the strut exerts
- If it closes slowly and smoothly, the strut is sized correctly or slightly over-sized
- If it slams shut or drops quickly, the strut is undersized—you need more Newtons
- If you must push down hard to close it, the strut is oversized for comfort
Choosing Between One 100N Strut or Two
For loads under 5 kg, a single 100N strut usually suffices. For loads 5–10 kg, two 100N struts (total 200N) provide balanced support, smoother operation, and safety margin. Two struts also distribute wear evenly and prevent the panel from tilting to one side as a single strut ages. Most professional installations use two gas struts for any load over 6 kg, regardless of calculated minimum force.
Using the Gas Spring Force Calculator
For precise sizing, use the Gas Spring Force Calculator to input your specific lid weight, hinge distances, and mounting angle. The calculator eliminates guesswork and recommends the correct Newton rating for your application with built-in safety margin.
Common Mistakes When Buying a 100N Strut
Many buyers select a 100N strut based on weight alone without considering hinge geometry or mounting angle. This is the primary reason gas struts fail or perform poorly after installation. Always measure hinge-to-load distances and confirm the mounting angle before ordering. When in doubt, specify a higher Newton rating (120–150N) rather than risk undersizing.
Technical Specifications of Standard 100N Gas Struts
Most 100N gas struts share these characteristics:
- Force: 100N (±5N tolerance typical)
- Stroke: 100–300 mm (varies by model)
- Temperature range: -30°C to +80°C
- Cycle life: 50,000 cycles (standard grade)
- Mounting types: eye-to-eye, stud, ball socket, clevis
- Rod diameter: typically 8–10 mm
- Pressure: nitrogen-filled, typically 60–80 bar
Summary: Is 100N Enough for Your Application?
A 100N gas strut holds approximately 10.2 kg of force in ideal vertical conditions but typically supports 4–8 kg of actual weight in real-world installations due to angle and leverage effects. It is suitable for light to medium furniture, small cabinet doors, and compact loft hatches. It is insufficient for automotive applications, large caravan doors, or heavy industrial machinery. Always calculate your specific requirements using hinge geometry and consult the force calculator to confirm 100N is adequate before purchase.
For specific fitment or replacement struts for your application, browse our furniture and cabinetry selection or contact our technical team for bespoke recommendations.