Weld-In Dead Lock for 40 x 40mm Box Section Gates, Double-Throw Deadbolt, Euro Cylinder and 3 Keys

A dead lock built to become part of a 40 x 40mm box section gate frame. The steel lock box sits in line with the closing stile, so the gate frame carries on above and below it and the box itself is welded into place. The lock lifts out while you weld and goes back in afterwards. A key turn throws a square deadbolt out by 24mm, and the supply includes a euro cylinder, three keys and a keep plate for the post. There is no latch and no handle: this lock is locked and unlocked with the key only. It can be fitted either side of a gate. The price shown is for one lock set.

Why this part works

It is the frame, not an add-on. A surface lock bolts onto the outside of a finished gate. This one is welded into the stile during fabrication, so nothing stands proud of the frame and the join is as neat as the rest of your welding.

The lock comes out before you weld. The lock case slides out of the box, so heat from the torch never reaches the mechanism. Weld the box, let it cool, clean and paint it, then slide the lock back in.

A proper double throw. The deadbolt moves 24mm into the keep on a double throw of the key, which gives a much firmer hold than a single short throw.

Standard euro cylinder. It takes a euro profile cylinder, so if you ever lose the keys or want the lock keyed to match others on site, you change the cylinder rather than the lock.

Where it is used

Yard and compound gates, pedestrian gates in security fencing, plant room and bin store gates, and any 40 x 40mm box section gate you are making or repairing where the frame can be cut and welded. It is a fabricator's part, so you need a welder and the gate needs to be in the workshop or the stile accessible. For a finished gate that cannot be cut, choose a surface mounted lock instead.

Specifications

Choosing the right option

The size is the size of the box section you are welding it into, and this one is for 40 x 40mm frames only. A smaller frame needs a smaller lock box: the box is 40mm across, so it will not sit neatly in 30mm tube. If you want the gate to latch shut on its own without a key, you need a lock with a latch and handle as well, which is the sash version listed below rather than a dead lock.

Fitting and care

Take the lock case out of the box before you start. Cut the stile to leave a gap for the 100mm box, set the box in line with the frame and weld along the top and bottom where it meets the stile. Let it cool, then clean and paint the welds before refitting the lock case, because welding spatter and hot-dip galvanising will both ruin the mechanism. Galvanise the frame with the lock out if you want a galvanised gate.

Fit the keep plate to the post with the 48 x 10mm slot aligned to the bolt. Fit the cylinder and tighten the cylinder screw last. Oil the bolt lightly once or twice a year and use graphite, not oil, in the cylinder.

Frequently asked questions

Ordering and delivery

Order online, with Express UK Delivery to your site and same-day dispatch on orders before 2pm, Monday to Friday. For a larger job, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will confirm availability and delivery before you order.