Sizing tool · length & geometry

Gas Strut Calculator

Enter your panel dimensions, weight and hinge position. We match the right strut length, work out where the brackets go, and give you the part to order.

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Enter parameters
Step 01
Measure the panel
Step 02
Set hinge & angle
Step 03
Order the match
Your Inputs
Calculation type
Top-hinged lid lifting up and back over the box.
01 / Panel
Weight
kg
Lid Depth hinge→front
mm
Lid Width
mm
Lid Thickness
mm
Box Wall Height hinge→floor
mm
Box Mounting Tilt e.g. sloped ute tray
°
Positive = hinge end lower (lid falls open easier). Negative = hinge end higher (lid falls shut harder).
02 / Hinge & mount
Hinge Mount
Pivot assumed at the wall's inner top corner.
03 / Motion
Number of Struts
2 struts required for panels over 5 kg
Max Open Angle
°
Shorter angle = shorter, cheaper strut.
Opening assist
20°
Lift to this angle, release — lid holds open on its own.
Adjust the slider below to change how light or assisted the opening feels.
2D Guide
Gravity closes (latch zone)
Strut holds open
Strut self-opens here
Fig. 01 / Geometry · side view1:10
Strut Panel Closed position Bracket A / B Hinge pivot
Fig. 02 / 3D previewdrag to rotate
A · panel bracket   B · wall bracket   Hinge
 
 
0°
—
Hand: —
Installation Diagram
A = bearing shoe on lid (20mm arm) · B = side bracket on wall (standoff)
Order
Recommended variant
 
—
—
 
Install length
—
Stroke
—
Kicks in at
—
 
Qty
2
—
NZ$ incl. GST
End fittings both ends
🛒 Add to Cart
Nearest alternatives
8mm Gas Strut · all 16 length variants · $75 each incl. GST reference only
Mounting Positions
AHinge to bracket A, along the panel
—
BBracket B in from the hinge wall
—
CBracket B offset off the hinge line
—
Print this diagram with your figures filled in and take it to the bench.
—
Strut horizontal at close → latch force: —
Behaviour
—
Gravity closes
—
Strut holds
Strut kicks in at
—
Push to close (from open)
—
against strut
—
Tube → lid (A) · Rod (thin, 12mm exposed) → wall (B)
Horizontal at close → rod seal lubricated ✓