Wall Plug Colour Chart — UK Colour Coding Guide
Every wall plug in the UK follows the same colour-coding system, regardless of brand. Whether you buy Fischer, Rawlplug, DeWalt, or a budget brand, a red plug is always 6mm and a brown plug is always 7mm. This chart explains every standard colour, what drill bit and screw to use with it, and how much weight each size can hold.
Quick Answer
The four most common wall plug colours in the UK are: yellow (5mm) for light loads, red (6mm) for general-purpose, brown (7mm) for heavy loads, and blue (10mm) for very heavy structural fixings. The colour tells you both the plug diameter and the drill bit size needed.
Complete Wall Plug Colour Chart
| Colour | Plug Diameter | Drill Bit Size | Screw Gauge | Hole Depth | Weight Capacity (masonry) |
|---|---|---|---|---|---|
| 🟡 Yellow | 5mm | 5mm | No. 4–8 (2.5–4mm) | 30mm | Up to 20kg per fixing |
| 🔴 Red | 6mm | 6mm | No. 6–10 (3.5–5mm) | 35mm | Up to 40kg per fixing |
| 🟤 Brown | 7mm | 7mm | No. 8–12 (4–5.5mm) | 40mm | Up to 60kg per fixing |
| 🔵 Blue | 10mm | 10mm | No. 12–16 (5.5–8mm) | 50mm | Up to 100kg per fixing |
| ⚪ White/Grey | 8mm | 8mm | No. 10–14 (5–6mm) | 45mm | Up to 75kg per fixing |
| 🟢 Green | 12mm | 12mm | No. 16–20 (8–10mm) | 60mm | 100kg+ per fixing |
Weight Capacities Are Approximate
The weight ratings above assume a solid masonry wall (brick or concrete block) in good condition with proper installation. In lightweight blocks, old crumbly mortar, or aerated blocks (like Thermalite/Celcon), actual holding capacity will be significantly lower. Always use a longer plug or go up one size in soft or poor-quality masonry.
Which Colour for Which Job?
Yellow Plugs (5mm) — Light Duty
Yellow plugs are the smallest standard size. Use them for picture hooks, small mirrors, light switch plates, cable clips, and anything that weighs under about 5kg per fixing point. They use small No. 4–8 screws and a 5mm masonry or multi-purpose drill bit.
Red Plugs (6mm) — General Purpose
Red plugs are the most commonly used wall plug in the UK. They handle curtain poles, towel rails, bathroom cabinets, medium shelves, coat hooks, and most household fixings. A pair of red plugs with No. 8 screws is the go-to fixing for most DIY jobs. Use a 6mm drill bit.
Brown Plugs (7mm) — Heavy Duty
Brown plugs step up to serious holding power. Use them for wall-mounted TVs (with an appropriate bracket), heavy shelves, kitchen wall units, boiler brackets, large mirrors, and heavy radiators. They accept No. 8–12 screws and need a 7mm drill bit.
Blue Plugs (10mm) — Very Heavy Duty
Blue plugs are for structural and very heavy applications — security gates, stair rails fixed to masonry, large radiators on external walls, heavy-duty garage shelving, and outdoor fixtures exposed to wind load. They use large coach screws or No. 12–16 screws and a 10mm drill bit.
Less Common Colours
While yellow, red, brown, and blue cover 95% of domestic DIY jobs, you may also encounter white or grey plugs (8mm — between brown and blue, occasionally used in commercial settings) and green plugs (12mm — heavy industrial/structural use). Some brands also make 3.5mm and 4mm plugs for very small fixings, but these are rarely stocked in UK DIY stores.
Frequently Asked Questions
Are wall plug colours the same across all brands?
Yes. The colour-coding system is standardised across the UK market. A red plug from Fischer, Rawlplug, DeWalt, or any own-brand range is always 6mm. The shade may vary slightly but the sizing is consistent.
What if my wall plug doesn’t match these colours?
Some specialist plugs (like Fischer DuoPower in grey, or frame fixings) use different colours. In these cases, ignore the colour and go by the diameter printed on the packaging. The colour chart applies specifically to standard expansion wall plugs.
Can I use a wall plug that’s one size bigger than needed?
Yes, going up one size is fine and gives extra holding power. Going down is risky — an undersized plug may fail under load. When in doubt, always size up rather than down.
Recommended Wall Plugs
| Product | Colour/Size | Best For | Link |
|---|---|---|---|
| Fischer SX 6mm Red (50 Pack) | Red / 6mm | General-purpose masonry | View on Amazon |
| Rawlplug Mixed Wall Plug Kit (272 Pieces) | Mixed | All-in-one kit for any job | View on Amazon |
| Fischer DuoPower 6x30mm (100 Pack) | Grey / 6mm universal | Any wall type — masonry or plasterboard | View on Amazon |
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