Glass adaptor D50 spherical, with inner thread, SS, satin

The Strofix D50 spherical glass adaptor with inner thread and extended spacer is a stainless-steel point fixing used to mount 8–21.52 mm glass panels to flat surfaces in balustrades, façades, canopies, and architectural glazing, with a threaded spacer that allows fine on-site adjustment of the glass offset. Available in AISI 304 or AISI 316 grade with satin finish, a Ø50 mm domed cover, an M10 fixing, and five selectable spacer heights (15, 22, 32, 42, or 52 mm).

The Ø50 mm spherical (domed) cover gives the fixing a distinctive rounded profile and allows small angular deviations between the glass and the mounting surface, which is useful in façade and canopy applications where perfect planarity cannot be guaranteed. Each adaptor secures the glass through a single Ø17 mm pre-drilled hole, with a 16 mm inner bushing diameter, and is tightened with an M10 stainless-steel screw that engages the M10 inner thread of the chosen spacer. The threaded spacer lets the installer fine-tune the standoff distance on site — listed as "slightly adjustable" — which is useful for aligning multiple panels along a façade or compensating for substrate irregularities. AISI 304 suits interior and standard exterior installations; AISI 316 contains added molybdenum for higher resistance to chlorides and salt air, making it the correct choice for coastal and high-humidity environments (note that AISI 316 is supplied in the 52 mm spacer variant only).

The satin finish reduces visible fingerprints and micro-scratches compared to polished stainless steel and suits architectural glazing where a clean, neutral look is required.

Use cases:

• Architectural glass façades and curtain wall point-fixed panels requiring on-site alignment
• Glass canopies, entrance awnings, and porte-cochères with tight alignment tolerances
• Heavy-duty balustrades with thick toughened or laminated glass up to 21.52 mm
• Pool fencing and seafront balustrades with deeper standoff (AISI 316, 52 mm spacer)
• Full-height glass partitions with pronounced shadow gap between substrate and panel
• Retrofit installations on existing walls where finish layers add depth and tolerances must be absorbed on site

FAQ:

What glass thickness does this adaptor support?

This D50 spherical inner-thread variant is suitable for glass panels from 8 mm to 21.52 mm thick, covering standard toughened glass and thicker structural laminated glass buildups commonly used in architectural façades and heavy-duty balustrades.

Which spacer height should I choose?

The threaded spacer sets the standoff distance between the substrate and the glass panel. Choose 15 mm for a short offset, 22 or 32 mm for standard wall construction, and 42 or 52 mm where additional clearance is needed for insulation, finish layers, or a pronounced shadow gap. The M10 inner thread allows fine on-site adjustment within a small range. Note that AISI 316 is offered only in the 52 mm spacer; the 15, 22, 32, and 42 mm spacers are AISI 304 only.

What does the inner thread enable?

The selected spacer has an M10 internal thread that engages the screw directly. The installer can rotate the fixing to fine-tune the standoff distance on site — listed as "slightly adjustable". This is useful for aligning multiple panels precisely along a run or compensating for small substrate irregularities.

How does this differ from the 10 mm spacer D50 spherical inner-thread variant?

The 10 mm SKU offers a single short spacer with selectable M10 or M12 thread on 8–17.52 mm glass through a Ø18 mm hole. This SKU offers five taller spacers (15–52 mm), uses an M10 thread only, and supports thicker glass up to 21.52 mm through a smaller Ø17 mm hole. Choose this SKU when the wall buildup or design requires more than 10 mm standoff or the glass is thicker than 17.52 mm.

What size hole must be drilled in the glass?

A minimum Ø17 mm hole is required for the M10 screw. The adaptor uses a 16 mm inner bushing diameter. The hole must be pre-drilled by the glass supplier before tempering — toughened glass cannot be cut or drilled after heat treatment.

What is the difference between AISI 304 and AISI 316?

AISI 316 contains molybdenum, which provides higher resistance to chlorides and salt air. Specify AISI 316 for coastal, pool, and high-humidity installations. AISI 304 is sufficient for interior use and standard outdoor conditions inland. On this SKU, AISI 316 is available only in the 52 mm spacer height.

About glass adaptors

A glass adaptor is a stainless-steel point fixing that attaches a glass panel to a supporting structure through a drilled hole in the glass. It transfers load from the panel to the substrate while keeping visible hardware to a minimum, leaving the glass as the main visual element in balustrades, façades, partitions, canopies, and shower enclosures.

Strofix supplies round glass adaptors from Ø12 mm up to Ø70 mm (including D30, D38, D40, D50, D60 and D70) plus square 38×38 and 40×40 versions, in AISI 201, AISI 304 and AISI 316 stainless steel, with satin, polished or painted finishes and a broad range of spacer heights. The right adaptor depends on glass thickness, wall-to-glass offset, environment and the type of supporting surface.

Glass adaptors are essential components used to securely connect glass panels to supporting structures while maintaining a clean, modern appearance. They are widely applied in glass railings, partitions, façades, canopies, and other architectural systems where both stability and design matter. By creating a reliable fixing point between glass and metal or wall-mounted surfaces, glass adaptors help distribute load evenly and ensure structural safety without compromising transparency.