Waterproof Junction Boxes & Terminal Enclosures
Sealed enclosures for wiring junctions, terminals and small equipment: gasket-sealed junction boxes, terminal enclosures, sensor housings and inspection boxes, built to your drawing with gland entries and corrosion protection for outdoor and wet environments.
Small Enclosures Where the Seal Is Everything
A junction box has one job and it is unforgiving: keep water out and let nobody think about it again for ten years. The gasket channel depth, the cover screw pitch, the gland seating face and the coating on cut edges are what decide whether it does that job.
We manufacture the box, the gasket channel, the gland entry and the mounting provisions to your drawing, including cast-free folded and welded constructions where volumes do not justify a mould.
Closer Look at This Enclosure Type
Representative photographs of the construction, interfaces and installation context for this product family.
Specifications at a Glance
| Parameter | Typical Specification |
|---|---|
| Typical unit | Junction box, terminal enclosure, sensor housing, inspection box, wiring chamber |
| Mounting | Wall, pole, bracket, floor stand, DIN rail inside the box |
| Materials | SPCC 1.0-1.5 mm, galvanized SECC, SUS304 / 316L for washdown, marine and chemical exposure |
| Size envelope | From 80 × 100 × 60 mm up to 600 × 800 × 250 mm |
| Sealing design | Continuous gasket channel, controlled cover screw pitch, sealed gland face, welded or folded corners |
| Entry options | Pre-cut gland entries, knockouts, blank plates, cable glands fitted to your specification |
| Closure | Screw-fixed cover, hinged door with latch, quarter-turn fasteners, captive screws |
| Finish | Powder coat, zinc plating, hot-dip galvanized parts, stainless brushed for hygiene areas |
The parameters above are representative of typical projects in this category. Your drawing defines the final specification, and every quotation states the scope it covers.
Popular Configurations We Manufacture
Every size and option is customised to your drawing. Use a configuration below as a starting point for your enquiry.
Compact Junction & Terminal Boxes
Small sealed boxes for wiring junctions, terminals and sensor connections.
| Typical size | 80 × 100 × 60 to 300 × 400 × 150 mm |
| Closure | Screw-fixed cover, captived screws |
| Entry | Gland entries or knockouts to your sizes |
Inspection & Access Boxes
Larger boxes with a hinged door so the interior can be inspected and serviced on site.
| Typical size | 300 × 400 × 150 to 600 × 800 × 250 mm |
| Door | Hinged with latch or lock |
| Internal | DIN rail or terminal rail provision |
Stainless & Hygienic Enclosures
Stainless boxes for washdown, marine and food environments where coating is not enough.
| Material | SUS304 / 316L 1.0-1.5 mm |
| Finish | Brushed or bead blasted, no coating to chip |
| Detail | Sealed welded corners, hygienic gasket option |
Materials, Finishes & Customisation
Box material
| Cold-rolled steel SPCC | 1.0-1.5 mm — indoor and sheltered positions with a coated finish |
| Galvanized steel SECC | 0.8-1.5 mm — improved corrosion behaviour at cut edges |
| Stainless steel SUS304 / 316L | 0.8-1.5 mm — washdown, marine, chemical and food environments |
Seal engineering
| Gasket channel | Formed relief with a controlled depth so the gasket compresses without being crushed |
| Screw pitch | Cover fixings positioned to keep even compression along the whole gasket line |
| Corner treatment | Welded and sealed, or folded with a continuous gasket path — no open seam to the inside |
Customisation
| Gland entries | Cut to suit the exact cable and gland sizes you fit, with a flat seating face |
| Internal fittings | Terminal rails, DIN rails, mounting plates, earth studs, cable clamps |
| Marking | Rating plates, circuit labels or engraved identification to your artwork |
How This Product Moves Through the Workshop
For a sealed box the gasket channel and screw positions are formed in the same operation that produces the box, so the seal path is continuous and repeatable. Cut edges are deburred and coated, gland faces are left flat for a proper seal, and the gasket is fitted only after coating. Sealed assemblies are then packed with protection for the gasket during transport.
- Drawing review with DFM feedback before production release
- Fiber laser cutting of the complete flat pattern in one set-up
- CNC press-brake forming, welding and grinding
- Coating applied before gaskets, hardware and glass are fitted
- First-article and sample inspection recorded for each batch
Common Questions About This Product
With a continuous gasket channel, a controlled screw pitch and sealed gland entries, sheet metal boxes commonly achieve IP65 and above when fully sealed. Where the box is large or needs ventilation, the achievable level is lower. Any formal verification test is carried out by you with your chosen laboratory.
Yes. Tell us the gland thread and cable sizes and we will cut the entries accordingly, leaving a flat seating face so the gland seals properly. Spare blanking plates can also be supplied for unused entries.
Stainless is the right choice where the box will be washed down regularly, exposed to salt or chemicals, or installed in food and pharmaceutical areas. For ordinary outdoor and industrial positions, galvanized steel with a good coating and sealed cut edges is usually sufficient and considerably cheaper.
Gaskets are normally fitted by us as part of the enclosure build. Glands, terminals and internal electrical components are usually supplied by you, though we can fit hardware you send us or source standard items on request.
Yes. Every size is built from the drawing, so there is no catalogue limit. For short runs a folded and welded construction avoids the tooling cost of a moulded enclosure while still giving a properly sealed result.
Guides for This Application
Waterproof Junction Box Fabrication: IP-Rated Terminal Boxes
Gaskets, gland entries and materials for IP boxes
Read guideIP-Rated Enclosure Sealing: Glands, Gaskets and Entries
Keeping an IP rating real once cables are fitted
Read guideJunction Box Material Selection: Steel, Stainless or Plastic
Steel, stainless, aluminium and plastics compared
Read guideSend Us Your Drawing
Tell us the enclosure you need, the environment it works in and the quantity — we will return engineering feedback and a quotation, typically within 24 hours on working days.