Huayou Scaffold Limpet Clamp EN 74
A scaffold board rides on short transom tubes, and you need something to secure it down. The limpet clamp is positioned over the board edge, hooks under the transom tube, and the long bolt fastens the cap against the plank. One single wrench locks the board in place so that it cannot be moved. That is why for some markets the popular name is the scaffold mushroom coupler, a scaffold board coupler, or a plank coupler scaffold fitting— all the same pressed steel part.
The two ways the cap shape does the job are: A round hat limpet coupler provides a smooth bearing surface over the board edge and is the lighter, cheaper option. A square cap limpet clamp distributes pressure over a larger area, which is ideal for thicker boards or rental gear that gets handled hard. These are the same, regardless of whether a one-piece hooked clamp or does what it needs to, using the same pressed hook and forged nut.
Compared to a forged board coupler the tailored body remains less than 1lb or 1lb. Attackers drill more per trip, and erection moves faster. For those high-rise work and exposed façades, a few hundred boards make all the difference.
Scaffold Limpet Clamp EN 74 Specifications
| Item | Specification |
| Product Name | Round Cap Limpet Clamp |
| Weight | 0.36 kg |
| Bolt Diameter | 7/16" |
| Steel Grade | S235 |
| Workable Board Height | Up to 58mm |
| Standard | EN 74, BS 1139 |
| Surface Finish | E-galvanized, hot dip galvanized, painted, galvanized + painted |
Key Features of Huayou Scaffold Limpet Clamp EN 74
1.Pressed steel body:
Our body is constructed as a pressed steel limpet clamp and the hook and cap are stamped S235 plate, with little weight but no loss of grip on the transom tube.
2.Two Lid Styles:
round and square lids have the same function; the spherical limpet coupler with a lower profile and lower price, whereas the square cap has the advantage of distributing the load over a larger plate.
3.Board Retaining Function:
Scaffolding board securing clamp, board down onto the transom and prevent boards shifting in persistent high wind and moving load.
4.Board Height Range:
Suitable decks of up to 58mm, including the common timber boards, and steel decking.
5.Standard:
Made to the 2 environmental standards requested by most scaffold specifiers: EN 74 & BS 1139.
6.Surface Options:
E-galvanized (either white of golden), hot dip galvanized, painted, or galvanized with a painted identification mark. The hot dip galvanized product is the one that will last for long time for rental and coastal applications when it is available as a galvanized limpet clamp.
Why Choose Huayou Scaffold Limpet Clamp EN 74?
Design Pressed to be Lightweight:
More fittings per trip and erecting quicker by fitters of 0.36kg or 0.43kg compared to with forged board couplers.
Complete variety of finishes:
E-galvanized for short jobs, colour coded paint, hot dip galvanized for 20-year life rental and offshore application.
Standard Production:
finds consistency in batch quality with their production lines of EN 74 and BS 1139.
Export Proficiency:
Year since 2013, almost 50 countries customers, with export as a full system spanning documents to shipping.
Quality Oversight:
Each batch is wiped for its dimensions and zinc thickness before being packed, and test records are accessible upon request.
Competitive Factory Pricing:
Since both cap types run on the same pressed lines, it's not difficult to maintain price across orders.
FAQ
Q: Round cap or square cap:Which one do I need to order?
A: The function is same. Round cap limpet clamp is lighter and cheaper - may do the job for a lot of board work. Tightening pressure for thick boards or the heavy use rental can be handled better with the square cap usually.
Q: How thick is the board that the clamp works on?
A: Works for boards up to 58mm high. Tell us the actual size of your board and we'll verify before production.
Q: What is the difference between this and a forged board coupler?
A: The body of the pressed clamp is lighter and easier to grip. Forged versions have higher load ratings, reducing stress. Where speed and weight are more important than load, the limpet clamp is your best board fixing option.
Q: Which finish is best for lives on the coast sites?
A: Hot dip galvanized limpet clamps offer the longest anti-rust life, which is around 20 years on average. E-galvenised, is acceptable for neighbourhood work for a short time.
