Glass adaptor - gasket, 40x40, Silicone

The Strofix glass adaptor gasket 40×40 silicone is a square silicone sealing pad designed for use in Strofix 40×40 mm square glass adaptor assemblies, placed between the stainless-steel cover or distancer and the glass panel surface. Manufactured from silicone rubber, 38×38 mm outer dimensions, Ø 10.5 mm central hole, 2 mm thick. The gasket is a flat type without a flange.

The gasket cushions the contact between the metal adaptor components and the glass, preventing direct metal-to-glass contact that could cause stress cracks or scratches. The square shape is designed to match Strofix 40×40 mm square glass adaptor covers and distancers, providing full coverage within the adaptor footprint. Silicone offers high flexibility and maintains its elastic properties across a wide temperature range, making it suitable for both indoor and outdoor installations. Two gaskets are typically required per adaptor point — one on each side of the glass panel. The gasket is sold individually.

The Ø 10.5 mm internal hole is sized for M10 screws or studs to pass through.

Use cases:

• Sealing 40×40 mm square glass adaptor assemblies on balustrades, partitions, and façades
• Replacing worn or compressed gaskets in existing Strofix square adaptor installations
• Cushioning glass-to-metal contact in square point fixing assemblies
• Stocking spare gaskets for maintenance of 40×40 mm glass fixing systems
• Indoor and outdoor installations requiring flexible, UV-stable sealing

FAQ:

What is this gasket used for?

The gasket sits between the stainless-steel adaptor component (cover or distancer) and the glass panel in a Strofix 40×40 mm square point fixing assembly. It prevents direct metal-to-glass contact, cushions clamping pressure, and provides a seal. Two gaskets are typically used per fixing point — one on each side of the glass.

Why is this gasket square?

The square shape matches Strofix 40×40 mm square glass adaptor covers and distancers. Round gaskets (D30, D40, D50, etc.) are designed for the round adaptor range and are not compatible with the square adaptor footprint.

What internal hole diameter does it have?

The internal hole is fixed at Ø 10.5 mm on this SKU, sized for M10 screws or studs. There is no selectable hole-size option.

What material is it made from?

Silicone rubber. Silicone is flexible, maintains its elastic properties over a wide temperature range, and is resistant to UV degradation and ageing.

Is this gasket compatible with round D40 adaptors?

No. Despite the similar 40 mm dimension, the square 40×40 mm gasket is designed exclusively for the Strofix square adaptor range. For round D40 adaptors (Ø 40 mm), use the round D40 gaskets available in EPDM or silicone.

How often should the gasket be replaced?

Silicone gaskets maintain their sealing properties over many years under normal conditions. Replacement is recommended if the gasket shows visible compression set, tearing, or no longer provides a seal against water ingress.

About glass adaptor gaskets

A glass adaptor gasket is a rubber or silicone washer that sits between the metal adaptor body and the glass surface, preventing direct steel-to-glass contact. It cushions the clamping force, compensates for minor surface irregularities and protects the glass edge around the drilled hole from chipping or stress cracking under load.

Strofix supplies glass adaptor gaskets in six sizes — D30, D40, 40×40, D50, D60 and D70 — in two materials: EPDM rubber and silicone. Both flat gaskets and gaskets with an integrated flange are available; flanged variants provide additional coverage around the hole perimeter.

The correct gasket depends on the adaptor diameter, the required material and whether a flanged or flat profile is needed for the assembly.