316 Stainless Steel Square Glass Clamp 52 x 52mm for Flat Post, 8-12mm Glass, Safety Pin

This large square clamp holds a glass panel up to 12mm thick to a square post, box section or wall, in marine grade stainless steel for outdoor and poolside balustrades. It is grade 316 stainless steel with a satin brushed finish, 52 x 52 x 31mm, with a flat back, rubber pads for 8mm, 10mm and 12mm glass and an optional safety pin. Two countersunk screws close the two halves round the glass edge. The price shown is for one clamp.

Why use this clamp

Grade 316 for outdoor and coastal work. 316 stainless contains molybdenum, which resists the chlorides in sea air, pool water and de-icing salt far better than 304. On a roof terrace, balcony or pool surround it keeps its finish with simple cleaning.

Takes 12mm glass. The larger body grips 8mm, 10mm or 12mm toughened glass with the matching rubbers. Thicker glass is stiffer between posts and is often specified for wider panels and busier areas.

Flat back for square posts and walls. Square and rectangular posts, box section, flat bar and walls need a flat-back clamp. A curved-back clamp would rock and never hold the glass straight.

Safety pin option. The pin sits inside the clamp and passes through a hole in the glass, so the panel cannot slide out even if a screw works loose. Use it where the glass is drilled for it, or leave it out.

Where it is used

Glass balustrades on square-post roof terraces, balconies, decks and stairs; pool and hot tub screens; glass infill in box-section frames; and glass screens fixed to walls, indoors or out.

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. A run of three panels between four posts takes 12. Tall or wide panels may need a third clamp each side; follow your glass supplier's or designer's layout.

Choosing the right option

Use this flat-back clamp on any face at least 52mm wide. Fit the rubber pads to match your glass: 8mm, 10mm or 12mm. If you want the safety pin, order the glass with holes drilled before toughening, matched to the pin position. Choose this larger clamp for 12mm glass; for 8mm or 10mm glass the 45mm square clamp is neater. Choose 316 for outdoors, coastal sites and pools.

Fitting and care

Mark the clamp heights on every post with a level line. Drill and tap the post, fix the back half, then fit the rubber pads for your glass. Set the glass on packers, fit the pin if used, offer up the front half and tighten the two countersunk screws evenly until the glass is gripped firmly, without overtightening. Use toughened safety glass only. Wipe with warm soapy water; on the coast or by a pool, a fresh-water rinse every few weeks keeps the satin finish bright. Do not use wire wool or chloride cleaners.

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.