A horseshoe packer earns its place because of one detail: the open slot. It slides around a screw that is already in the frame, so a fitter can correct a gap without pulling the fixing out. Our range covers four body lengths, from 45 mm to 140 mm, in PP, with thicknesses from 1.0 mm to 10 mm.
What the Open Slot Changes on Site
A closed shim has to go in before the fixing. That order is fine on a bench and awkward on a third-floor frame, where the unit is already screwed off and a gap has appeared at the head. The slot reverses the sequence. Loosen the screw, slide the packer in, tighten it again. The tail hole is the second half of the idea, because it lets you pin the packer so it cannot drop while the next operation runs.
Matching Length to the Gap
Length governs reach and bearing area, not the gap alone. A 45 mm body goes into a narrow reveal where a 140 mm packer will not physically sit. The 140 mm body spreads the same load over more than twice the footprint, which matters when the packer carries a sill and the weight above it. We keep 75 mm and 90 mm as working stock, because most frame work falls between those two jobs, and hold the 140 mm for sills and heavier units.
The Four Lengths at a Glance
| Body | Width x length | Thickness | Where it sits |
|---|
| 45 mm | 47 x 49 mm | 1.0 to 10 mm | Narrow reveals, sashes, bead packing |
| 75 mm | 35 x 75 mm | 1.0 to 10 mm | Frame shimming at head and jambs |
| 90 mm | 35 x 90 mm | 1.0 to 10 mm | Deeper reveals, door frames |
| 140 mm | 38 x 140 mm | 1.0 to 10 mm | Sills, heavy units, wide bearing |
Single thicknesses come 200 to a bag at the thin end of the 75 mm series, and 70 to a bag at 10 mm. Piece weight rises from 2.2 g to 21.3 g across that span.
Mixed boxes are the other way to buy: 120 pieces covering six thicknesses, or 600 pieces for a stockist who wants one carton to serve a whole site. Colour works as a thickness cue rather than decoration, since red, blue, green, yellow, black and grey let a fitter pick a size by eye at arm's length.
Where These Packers Are the Wrong Answer
Three cases where we push back. Structural steel packing is one, because a PP packer is a spacer and the steel connection still needs its own engineered shim. Fire-rated assemblies are another, since the packer is part of a tested system or it is not, and a generic part cannot be dropped into somebody else's report. The third is a gap above 10 mm in a load path, where one thick packer beats three thin ones and we would rather quote the plate range than have you stack.
FAQ
Can horseshoe packers be stacked to close a wider gap?
They can be stacked, and on site they often are. The catch is that each interface adds a little movement under load, so a stack of three 1 mm packers does not behave like one 3 mm packer. Above 10 mm we would move you to a plate packer before we would sell you a stack.
Do these packers carry a load rating?
Our product data lists a maximum load of 5 tonnes for the range. Size and rating are moulded into the face as well, so a packer can be identified after it has been dropped in a bucket. For structural or fire-rated work, ask us for the test data rather than relying on the marking alone.
What is the difference between the 75 mm and the 90 mm packer?
Both are 35 mm wide, so the difference is reach. The 75 mm suits standard frame shims, and the 90 mm covers deeper reveals or a frame that sits back from the face. The thickness options are the same on both, so the detail drawing makes the choice rather than the load.
Yifang Plastic moulds window packers in PP at its facility in Langfang, Hebei. The 140 x 38 mm horseshoe packer and the 75 x 35 mm packer for window and door frames are listed with their thickness options. The reasoning behind the heavier end of the range sits in a note on packers for double glazing. For the survey and installation practice that decides where a packer may sit, see BS 8213-4. Written by the Yifang technical team. AI tools were used to help draft this article from our own product data and photographs.
پیام شما باید بین 20 تا 3000 کاراکتر باشد!
