Soft Close Lid Struts 400mm 300N – Ball Socket Mount – L & Flat Bracket Kit (Pair)
✓ IN STOCK – FAST UK DISPATCH
This 400mm 300N soft-close lid strut pair is engineered to deliver controlled opening and smoother closing behaviour for hinged storage lids. Unlike basic lift supports, soft close systems focus on balanced movement, helping lids open steadily while preventing sudden drops during closing.
The included L + Flat mounting bracket combination allows flexible installation inside storage furniture, tool chests and bench storage boxes where internal clearance and mounting geometry vary.
Product Engineering Summary
Soft close lid struts are designed to improve the everyday usability of hinged lids by adding controlled lift assistance and improved closing stability.
- Assisted lid opening with controlled motion
- Reduced lid slam risk
- Improved user safety
- Lower hinge stress over time
The 400mm extended length provides suitable travel for medium to deep lids while the 300N force rating supplies reliable lifting support when two struts are installed.
Technical Specification
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Force Output: 300N per strut
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Total Pair Support: 600N combined force
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Extended Length: 400mm
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Stroke Travel: 150mm
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End Fitting: 10mm Ball Socket
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Ball Stud Thread: M6
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Mounting Kit: 2x L Brackets + 2x Flat Brackets
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Supply Format: Pair (2 gas struts)
Where Soft Close Lid Struts Are Commonly Used
This configuration is widely used in furniture and storage systems where controlled lid movement improves safety and user comfort.
- Toy boxes
- Storage chest lids
- Bench seating with storage
- Tool box lids
- Furniture lids requiring assisted closing
Recommended Lid Size & Weight
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Recommended Lid Depth: 500–800mm
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Typical Lid Weight: 30–54kg (lid panel only)
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Installation Layout: One strut installed on each side
Actual performance may vary depending on hinge position, lid thickness and mounting geometry.
Bracket Configuration Explained
This model includes a mixed mounting bracket system designed to improve installation flexibility.
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L Brackets: create offset mounting on the box frame
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Flat Brackets: provide low-profile mounting under the lid
- Improves alignment when internal space is limited
- Reduces friction during lid movement
This combination is commonly preferred for furniture lids where full L-bracket kits would create unnecessary height or offset.
Installation Positioning Guide
- Install one gas strut on each side of the lid
- Mount the upper bracket approximately 20–30% from the hinge line
- Place the lower bracket on the internal side wall of the box frame
- Ensure the strut remains slightly compressed when the lid is closed
Correct geometry ensures smooth lid movement and prevents excessive force during opening.
Choosing the Correct Force Rating
- Lids lighter than 30kg may open too aggressively with 300N struts
- Lids heavier than 54kg may require a stronger force option
- Very deep lids may require longer struts for optimal leverage
Always calculate the weight of the lid panel only — contents inside the box should not be included.
Benefits of Soft Close Lid Support
- Prevents sudden lid drops
- Improves everyday usability
- Protects hinges and mounting screws
- Provides stable hold-open positioning
Soft-close lift supports are widely used to upgrade storage lids that previously relied on basic hinges without assistance.
AUTORCE Product Assurance
- Quality-tested lift performance
- Durable steel construction
- UK stock and fast dispatch
- Reliable customer support
Upgrade your lid mechanism with a controlled soft-close support system designed for reliable daily use.
