316 Stainless Large Square Glass Clamp for 48.3mm Tube, 17.52-21.52mm Laminated Glass

This large square clamp holds the thickest laminated glass, 17.52mm to 21.52mm, to the side of a heavy 48.3mm round stainless post, in marine grade stainless steel for heavy-duty glass balustrades indoors and out. It is grade 316 stainless steel with a satin brushed finish, 70 x 60 x 45mm, with a back curved to suit 48.3mm tube, rubber pads for 17.52mm, 20.76mm and 21.52mm glass and an optional glass support pin. Two countersunk screws close the two halves round the glass edge. The price shown is for one clamp.

Why use this clamp

Made for laminated glass. Laminated glass is two plies of glass bonded with an interlayer, so it stays in one piece if it breaks. The heaviest panels, made from two 8mm or two 10mm plies, come out at 17.52mm, 20.76mm and 21.52mm, far too thick for a standard clamp. This clamp has the deepest slot in the range and three sets of rubbers to suit.

The biggest body in the range. At 70 x 60 x 45mm, it is a large, solid clamp with plenty of rubber contact on each face of the glass, sized for the weight of the thickest laminated panels.

Grade 316 for outdoor and coastal work. 316 stainless resists sea air, pool water and de-icing salt far better than 304, so it suits roof terraces, balconies and pool surrounds.

Shaped to the heavier post. The back is curved to 48.3mm, the larger post size often chosen for heavy laminated glass and crowd-loaded balustrades, so the clamp sits tight on the tube with no rocking and the glass stays straight from post to post.

Optional glass support pin. A support pin is supplied in the box for glass drilled to suit, giving the panel a positive location inside the clamp. Without it, the clamp grips the glass on its rubber pads alone.

Where it is used

Heavy laminated glass balustrades on 48.3mm round stainless posts: shopping centre and atrium edges, stadiums and grandstands, transport hubs, schools and public buildings where crowd loads call for 17.52mm to 21.52mm glass, and tall wind screens on high-level terraces.

Specifications

Which glass clamp to choose

How many do you need?

Most panels are held by four clamps, two on each post, set about 150 to 200mm in from the top and bottom of the glass. Laminated panels are heavy, so tall or wide panels often need a third clamp each side; follow your glass supplier's or designer's layout. A run of three panels between four posts takes 12 clamps, or 18 with three per side.

Choosing the right option

Measure the actual glass: this clamp suits 17.52mm, 20.76mm and 21.52mm laminated glass. On 42.4mm posts, use the 42.4mm version. For 8mm to 12mm toughened glass, use a standard square or D clamp. Measure across the post: 48.3mm tube is often sold as 1 1/2" nominal bore, and this clamp will not sit tight on other sizes. If you want the support pin, order the glass with holes drilled before toughening and laminating, matched to the pin position.

Fitting and care

Mark the clamp heights on every post with a level line. Drill the post and fix the back half, then fit the rubber pads for your glass. Set the glass on packers, fit the support pin if used, offer up the front half and tighten the two countersunk screws evenly until the glass is gripped firmly, without overtightening. Use laminated safety glass to your designer's specification. Wipe with warm soapy water; on the coast or by a pool, a fresh-water rinse every few weeks keeps the satin finish bright.

Frequently asked questions

Ordering and delivery

Order online with Express UK Delivery and same-day dispatch on orders before 2pm, Monday to Friday. For a full balustrade, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will check quantities and delivery before you order.