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Description
The square external connector joins two lengths of 25mm box section end to end, so a rail can run longer than one length. Each box end pushes halfway into the sleeve and is locked by its own grub screw, with no welding or drilling. It is malleable cast iron with a galvanised finish, made for 25 x 25mm square box section. Use it for in-line joints in rails and frames; it is not intended as a structural splice. The price shown is for one fitting, with a minimum order of 10.
Why use a square external connector
Longer runs. Box section comes in fixed lengths. The connector carries a rail on past the end of one length without welding.
Uses offcuts. Join shorter pieces instead of cutting into a new full length for the last stretch of a run.
Stays square. Square box cannot twist inside a square sleeve, so the joined rail lines up flat face to flat face.
No hot work. Two grub screws and a hex key; no welding and no damaged galvanising.
Where it is used
Top and mid rails on square-section railings and fences, long shelf rails in racking, frames for screens and partitions, and repairs where a damaged length is cut out and replaced.
Specifications
| What you get | One external connector with two grub screws fitted, minimum order 10 |
|---|---|
| Fitting type | External in-line connector, square |
| Suits | 25 x 25mm square box section, both ends |
| A: length | 78mm |
| B: width | 42mm |
| C: height | 36mm |
| Material | Malleable cast iron |
| Finish | Galvanised |
| Grub screws | Two, one for each end (size not published for this line) |
| Weight | About 0.30 kg |
| Structural use | Not recommended as a structural joint |
Where to put the joint
- Close to an upright, not in the middle of a long span.
- Never where the box has to carry a load across a gap on its own.
- For a joint directly over an upright, use the 25mm square long tee, which joins the two ends and the upright in one fitting.
Other 25mm square fittings
| Joint | Fitting |
|---|---|
| Two lengths end to end | This external connector |
| Joint hidden inside the box | 25mm square internal connector |
| Rail through an upright | 25mm square four way cross |
| Rail on top of an upright | 25mm square short tee |
| Three rails at an upright | 25mm square side outlet tee |
How many do you need?
One for each place where two lengths meet in a straight line. For a rail longer than one length, divide the run by the length of box and round down; that is the number of joints per rail.
Choosing the right size
Square key clamps are sized by the outside of the box section. This one suits 25 x 25mm box; measure across the flats before ordering.
Fitting and care
Cut both box ends square and deburr them. Mark the middle of the connector on each length so the joint is centred, push the ends in until they meet, and tighten both grub screws firmly with a hex key. Check them after the first week. Touch up scratched galvanising with zinc-rich paint.
Frequently asked questions
Is the price for one fitting?
Yes. The price is for one connector with both grub screws fitted. The minimum order is 10.
Is the joint as strong as a solid length?
No. It is an in-line connector, not a structural splice. Place it close to an upright.
Will it fit round tube?
No. It is made for 25 x 25mm square box section only.
Ordering and delivery
Order 10 or more online, with Express UK Delivery and same-day dispatch on orders before 2pm, Monday to Friday. For larger quantities, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will confirm availability and delivery before you order.
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About Us
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Minimum order 10 pcs