By default, grommets are roughly evenly spaced along the edge. If this is not what you want, you must supply alternate spacing instructions in the notes field when filling in your custom tarp order.
When you specify the number of grommets for each edge, the system automatically calculates how far apart each grommet will be. The distances shown are from the center of the grommet to the center of the adjacent grommet. Please note that these distances are just approximations, some grommets may end up being closer or farther apart than what is indicated.
When grommets are specified for the top and bottom edges, we assume that the initial grommets will be set on the ends of the specified edge. The centers of these end grommets are always one inch from the edge of the tarp as shown in the following image.
By default, opposing grommets may not exactly line up. That is, if you fold the tarp in half the grommets on one side may not align with those on the other side. If this is necessary, please add a note about this. Similarly, if you order two tarps that are both ordered with the same grommet spacing it is unlikely the grommets from one tarp will align with those of the other unless we are specifically told that this is necessary.
Note that when entering the number of grommets, the numbers specified for the top and bottom edges are assumed to include the corner grommets. The numbers you specify for the sides won't include the corner grommets assuming the top and/or bottom edge has grommets. Notice in the diagram we show a representation of a square tarp with evenly spaced grommets. In this example you would specify four grommets for the top and bottom edges since these edges include the corner grommets. For the sides you would specify only two grommets since the sides would not include the corners in this case.
In terms of the ideal grommet spacing, this depends on the tarping application. If the tarp will be exposed to high winds, such as tarps used for utility trailers, it is a good idea to request more grommets to better distribute the load on each grommet. Nevertheless, remember that the grommets are only useful if you have a place to fasten them. If you have a fixed number of anchor points you generally want to try to align your grommets with these tie-down locations.
If you are attaching the tarp to a frame (such as a doorway, carport, window, garage, etc.) it is a good idea to start by deciding where the fasteners will go into the frame. Generally, the length of the tarp will be 2 inches greater than the distance between the fasteners on opposite sides of the frame.
Precise Grommet Positioning
Sometimes it may be necessary to position grommets or snaps, etc. at very precise positions. We can usually accommodate this but only if you supply us with a diagram that shows exactly where you would like the grommets to be set. The diagram should show the number of inches from each edge where the grommets are to be placed. If you are ordering several tarps and you are planning to join them together using grommets you need to advise us of this so that we can ensure that the holes are positioned to allow for this.
Grommet Sizes and Types
Our standard grommets are stainless steel and have an outer diameter of 1 inch and an inner diameter of 9/16".
Smaller stainless steel grommets are available having an outer diameter of 7/8" and an inner diameter of 7/16" are available.
FAQs
Generally, grommets are spaced about 6 inches apart on center. The first and last grommet are inset the space needed for the return to the wall, and in front of the window at the leading edge. If there is a window frame, blinds or shades on the window, you will want the spacing to clear what is behind the rod.
How to calculate grommet spacing? ›
((Curtain Width in Inches) – 5) / 7 = The Distance between each of your grommets. Now this works only if you start the center of your first grommet 2.5″ from both sides. Then you space your grommets X inches apart measuring from the center of one, to the center of the next. I'll give you a little tip here.
What is the spacing for grommets on a tarp? ›
➢ Grommets – Grommets are metal rings lining a small hole at the edge of a tarp to accommodate the attachment of cords or bungees to the tarp. Spacing of grommets will vary from 18 inches to 36 inches depending on the grade of the tarp. Higher grade tarps will have the grommets spaced approximately 18 inches apart.
How far from the edge should a grommet be? ›
The centers of these end grommets are always one inch from the edge of the tarp as shown in the following image. By default, opposing grommets may not exactly line up. That is, if you fold the tarp in half the grommets on one side may not align with those on the other side.
What is standard grommet placement? ›
As a standard, metal grommets are placed on every corner centered at . 75 in from each side. This will keep a nice symmetrical look on your banner. Using an automatic grommet machine is a high-tech professional way for your grommets to be installed easily with no work on your part.
How to measure for grommet placement? ›
How to Measure: Grommet Top Curtains
- Measure from where you'd like your rod installed to where you want the curtain to fall.
- Measure grommet panel length from the very top of the curtain (not the top of the grommet) to the bottom.
- The grommet is set down about 1" from the top of the panel.
The placement of the gromments distributes the weight of the banner evenly and keeps the banner from sagging. Typically, grommets should be placed every 2-3 feet along the edges of the banner.
How many grommet panels do I need? ›
A good rule of thumb is 1 WOM (width of material) for up to a 48” wide window, 1-1/2 WOM for windows 47” to 96” wide and 2 WOM for windows over 8 feet. Of course, if the drapery panels are operable, the required widths of material is calculated so that the panels fully cover the window when closed.
How do you size a grommet? ›
You can use a caliper to get most dimensions for your grommet, but you'll also need pin gauges to get accurate inside diameter (ID) and hole size measurements. Rubber grommets are not always circular either, which can make them difficult to measure.
What is the most popular grommet size? ›
The “size” of the grommet is dictated by the interior diameter of the hole. The most common size is the #2 (3/8”).
Eyelet and grommet dimensions are generally measured in thousandths of inches (3 decimal places). Therefore, it is advisable to use precise measurement tools to determine Stimpson part dimensions. We recommend a caliper for all dimensions except I.D. and hole size, which should be measured using pin gauges.
What is grommet placement? ›
Occasionally grommets are inserted for other reasons, such as to treat retraction of the ear drum. Grommets may also be referred to as ventilation tubes. Grommets are small tubes, around 3mm in size and usually made of plastic, that are placed in the eardrum.
What is the success rate of grommets? ›
Grommet insertion is one of the most common surgical procedures in children. In the United States of America (US), approximately 700,000 children [1], and in England over 30,000 children undergo the procedure each year [2]. A high success rate of 69–93% for treatment with grommets is reported [3].
How many sets of grommets can a child have? ›
If your Eustachian tubes don't start to function, you will need another set of tubes. For most children, function improves with growth. 1:4 people need another set of ventilation tubes inserted after the first set come out. 1:16 people need more than 2 sets of ventilation tubes.
Can you have grommets more than once? ›
The hole in the eardrum will usually heal quickly after the grommet falls out. In some children the fluid in the ear may come back. This can cause glue ear to happen again. Another operation to put in new grommets may be needed.
How often do you need grommets? ›
Grommets are tiny tubes inserted into the eardrum. They allow air to pass through the eardrum, keeping the air pressure on either side equal. The surgeon makes a tiny hole in the eardrum and inserts the grommet into the hole. It usually stays in place for six to 12 months and then falls out.
