Fiberglass and FRP Grating Clips, Hold-Down and Connectors

What a Grating Clip Actually Does

A grating clip is a connection component. It does one of two jobs, and installations that run into trouble usually treat those two jobs as one. A hold-down transfers restraint from the panel to the support so the panel stays where the drawing puts it. A panel connector keeps two edges level so the walking surface is continuous and the step at the joint stays small.

Neither job changes the structure. The allowable span and the load the panel carries are set by the panel, its bearing edges and the support spacing, which is why the same panel behaves differently on a 450 mm support spacing and on a 1200 mm one. A fixing cannot borrow capacity from the panel, and a clip placed between two supports holds the panel to nothing. Read the load and span guidance before a fixing is asked to solve a deflection problem.

Because FRP cannot be welded, a panel on a steel frame is either restrained by fixings, retained inside a frame or edge, or left loose on the supports. That decision belongs with the support layout, not with the maintenance team on the day the panels arrive. The installation guide sets out the same checks in the order they happen on site.

M, L and C: What the Letter Tells You

Suppliers use M, L and C to describe clip families, and the letters are understood the same way across the industry — but the letter is a shape, not a fit. Two manufacturers can both list an “M clip” and produce different jaw widths, different bolt centers and different overall heights for the same nominal panel.

Some suppliers publish a clip size list to order against. We do not, because the grating itself is made to the order: the clip is matched to the panel height of the panel being made and supplied with it, so there is no separate size list standing on its own. Send the panel height and format with the panel sizes and the matching clip comes back with the quotation.

What decides whether a clip works is narrower than the name:

• does the jaw sit on the bar rather than on the edge of it;
• does the height suit the ordered panel, so the panel is held flat instead of pulled out of shape;
• can the bolt reach the support and be tightened from where the installer is standing.

That is why we ask for the panel height and the bar width together. A clip that matches the height but carries a jaw sized for a wider bar will sit on the edge of the bar and distort the panel as it is tightened; a clip with insufficient bolt length cannot be fixed from below even though it looks correct in the pack. Panel dimensions and bar pitch are set out on the panel weight and size pages.

Names you will meet in other catalogs

Searching for fixings turns up saddle clips, WLP clips, T clips, G clips, J-bolts and recessed square clips. These are catalog names for particular hold-down and edge shapes, used mainly in North American distribution, and they describe a supplier’s geometry rather than a standard. If your drawing calls one of them up, send the fixing detail rather than the name: the jaw has to be matched to the bar of the panel we are supplying and to the support it bolts to. Where a shape falls outside our standard M, L and C range we say so at inquiry instead of substituting something that looks similar. Send the detail with the panel sizes and it is confirmed before the quotation is issued.

How Many Clips: the Count Comes From the Layout

Most answers to this question give a number of clips per panel. We do not publish one, because it would be wrong on most projects. A panel is restrained where it crosses a support, where its edges are held, and where the exposure lifts it — a fixing placed in the middle of a panel bay, between two supports, restrains nothing at all.

In practice the count comes from four things: the number of support lines the panel crosses, how the panel is cut and oriented, whether the edges need restraint as well as the supports, and how often the panel is lifted for cleaning or inspection. If your layout shows a 1220 × 3660 mm panel carried on support lines at 900 mm centers, the fixings sit at the crossings — the drawing gives the count, not the panel length. Where panels are removable, the same layout also decides which fixings have to be releasable and how the panel goes back.

Galvanized or Stainless: Choose for the Exposure

Galvanized steel is the ordinary choice for general access areas, indoor walkways and dry outdoor exposure. Stainless steel is used where the exposure, the cleaning regime or the project specification calls for it: wash-down areas, coastal and marine locations, and chemical or process areas. The grade is settled with the order, because stainless covers a wide range and one grade does not suit every environment.

The fixing deserves more attention than its price suggests, because it is the steel part of an installation that is otherwise not steel. A galvanized clip in a daily wash-down area, or stainless hardware against a support it is not compatible with, shows the environment long before the panel does. Where the fixing sits on a metal support, the two are considered as one assembly, and the exposure decides the pair. That is where the galvanized-or-stainless decision is actually made, and it is most often made in wastewater treatment areas rather than on a dry indoor walkway. The same logic runs through the chemical resistance pages and the resin selection guidance.

What Clips Cost

A clip is a small share of an order’s value, but it is the item most often left off a first quotation, which is why buyers end up pricing it separately at short notice. The price has a short list of drivers: the type, the panel height it matches, the material, the hardware supplied with it, and the quantity. Galvanized versus stainless steel is the largest single step in that list.

Published distributor prices give a sense of the market. These are list prices for clips sold in the United States, checked in October 2026, and they move with the market. Pack sizes and unit bases differ between listings, so read them as an order of magnitude rather than as a quotation:

Those are distributor prices rather than factory prices, and they are quoted here for context rather than as our offer. Our own clips are priced per piece against the panel you are ordering and the material the exposure needs, with the clip shown as its own line in the quotation so the quantity is visible. Send the panel height and format, the support and the quantity for a piece price; the panel base prices themselves are published in the price schedule.

Installation: What Goes Wrong on Site

The problems that reach us after delivery are rarely about the letter on the clip:

• a fixing tightened while the jaw is only partly on the bar, which pulls the panel out of shape instead of holding it;
• a bolt that cannot be reached from below, so the fixing is left loose or left out;
• a fixing position that lands between support members, where there is nothing to bolt through to;
• a joint connector treated as a support, with the panel edge left to carry load it was never rated for;
• panels left loose along an exposed edge, where the layout had assumed an edge restraint;
• a fixing brought down until the panel visibly deforms. It should seat on the bar and be brought up firmly; crushing the resin around a bar does not make the connection stronger.

Cutting and drilling change the panel as well as the fixing: openings and cut edges belong on the same drawing as the fixing positions, and a cut edge is sealed on request rather than by default. See cutting and edge sealing for what factory fabrication includes.

Maintenance, Replacement and Refitting Panels

Clips are the part of an installation that gets inspected, replaced and refitted, so they are worth recording. Corroded, deformed or loosened clips should be noted and assessed rather than tightened and forgotten, particularly where panels are lifted for maintenance or for access to equipment below.

When a panel goes back, the original fixing arrangement should go back with it. A panel refitted with fewer clips than the layout calls for is no longer the arrangement that was quoted, and the restraint it was designed to give is no longer there. If a clip has to be replaced, match it on the panel and the support rather than on the name: a measured panel height and bar width, plus a photograph of the fixing in place, are enough for us to say whether the clip we supply will fit. The wider inspection routine is set out under maintenance and service life.

Packing, Clips and Shipping

Clips travel in the same consignment as the panels they are matched to, so the fixing count and the panel count arrive together. Panels are wrapped in EPE foam and stretch film, and export orders normally go on wooden pallets with iron supports. We do not ship clip-only consignments: the clip is matched to the panel being made, and the two leave the works together.

Panel orders are supplied with a certificate of conformity and the factory product test report, and third-party testing is arranged per project where the specification asks for it. If the fixing itself needs a material or coating certificate, say so at inquiry so it is quoted and arranged rather than promised afterwards — the approach is the same as for order documents in general. Where a consignment mixes panels, cut pieces and accessories, the packing and the description that go with it are also what the customs classification is built from.