Rivet vs Eyelet vs Grommet: Selecting Hardware for Bags and Belts

Three small metal parts cause more confusion in trim meetings than any other group, and the confusion is mostly a naming problem. A rivet holds two layers together, an eyelet lines a hole through a single layer, and a grommet does the same job with a wider flange and a deeper barrel. Buyers who ask for the wrong one receive a part that is dimensionally correct and functionally wrong.

This article separates the three by function first and by size second. It works through the rivet vs eyelet difference under load, explains what matters when a grommet for belts or strap ends is specified, and sets out a bag hardware selection routine that can be applied position by position.

1. The Rivet vs Eyelet vs Grommet Question in Bag Hardware

The three parts differ in what they are asked to do rather than in what they are made of. A rivet is a permanent joint between two or more layers, and its job is to stop those layers moving apart. An eyelet is a lining for a hole, and its job is to stop the hole fraying, spreading or cutting a cord. A grommet is a heavier eyelet, with a wider flange to spread load and a longer barrel to pass through thick material.

That single distinction resolves most of the confusion. A rivet is chosen for a joint, an eyelet for a hole in thin material, and a grommet for a hole in thick or heavily loaded material. Bag hardware selection becomes far quicker once the position is described as either a joint or a hole.

2. Rivet vs Eyelet: How Each One Holds a Load

The rivet vs eyelet difference under load is a difference between shear and bearing. A rivet carries a shear load across its shank, which is why a rivet at a pocket corner survives a repeated pull. An eyelet carries a bearing load against the inner wall of its barrel, and the load is applied by whatever passes through the hole.

That is why the two are rarely interchangeable even when the diameters match. A rivet sized to hold a strap anchor will crush a thin panel if the setting force is not reduced, and an eyelet sized to line a cord hole will fail immediately if it is asked to clamp two layers together. A bag hardware selection that treats them as substitutes usually ends in a repair order.

A luggage maker met the point on a wheeled duffel. Strap anchors were first specified with a 5 mm eyelet through two layers of 1680D ballistic nylon, and the eyelet split at the flange within 40 cycles of a loaded trolley pull. Moving to a 9 mm cap rivet with a washer held the same load past 500 cycles and removed the flange crack entirely. The layers were the reason: a joint needs a joint, not a lining.

The same test applies in reverse, because a joint held by an oversized eyelet distorts the flange before it fails. That flange crack is what a repair bench sees most often on lightweight bags.

3. A Grommet for Belts and Straps: Size, Wall and Load

When a grommet for belts is specified, three dimensions decide whether it works. The inside diameter sets what can pass through, the barrel length has to exceed the material thickness by 1.0 to 1.5 mm so the rolled edge grips, and the flange diameter sets how much of the load is spread onto the surface. Getting the barrel right is the most common failure point.

Belt work adds a second constraint, because belt leather is thick and stiff and it flexes constantly. A grommet for belts set into 3.5 mm vegetable tanned leather needs a barrel of 5.0 to 5.5 mm and a flange of at least 10 mm. Anything shallower rolls short and works loose within a few months of wear.

4. Bag Hardware Selection: Matching Part to Panel

Bag hardware selection starts from the panel, not from the part. A panel has a thickness, a weave, a backing and a load, and those four numbers narrow the options quickly. A 1680D ballistic nylon with a PU backing behaves very differently from a 0.8 mm microfiber, and the same rivet will not suit both.

A short routine covers most cases. Measure the finished thickness including any backing, decide whether the position opens or stays closed, and then pick the part. Where the joint must hold, choose a rivet with a washer.

Where a cord or lace passes through, choose an eyelet for thin stock and a grommet for thick stock. Where the position opens, none of the three applies and a snap or a hook belongs there instead.

5. Rivet vs Eyelet in Leather and Coated Fabrics

Leather and coated fabrics change the rivet vs eyelet calculation because they do not fray and they do not stretch. A hole in leather will not run, so an eyelet is not needed to protect the edge for its own sake. The hole still needs lining when something moves through it repeatedly, because leather will burnish and enlarge under abrasion.

Coated fabrics behave differently again. A coated canvas around a hole tends to delaminate rather than tear, and the coating can lift from the base cloth over time. At any position where a cord moves, an eyelet is worthwhile on a coated fabric even when the base cloth is heavy.

One test separates the two cases quickly. Set the part on a scrap panel of the production material, then pull it with a luggage scale while watching the hole edge. An eyelet that lets the hole distort before the part moves is doing its job, while a rivet that stays put as the panel tears around it is not. Difei Button runs that check on any new bag hardware selection before the specification is frozen.

6. Grommet for Belts: Ventilation, Lacing and Adjustment

The grommet for belts is not purely a fastening part, and several applications use it for ventilation or lacing. A row of grommets across a wide belt lets air pass and can carry a decorative lace, and a grommet set at the end of a strap acts as a durable hole for a pin buckle. Each use points to a different spacing and a different flange.

Lacing grommets are usually set at 20 to 30 mm centres, while buckle holes are set at 25 mm intervals along the usable length. Ventilation rows on a wide belt are commonly set at 30 mm in a staggered pattern so the leather keeps its strength between the holes. Wider spacing is safer for the material, and closer spacing is safer for the lace.

Belt lacing is also a place where the grommet for belts earns its cost. A 5 mm grommet set at 25 mm centres across 3.5 mm leather takes a 3 mm cord comfortably, and the leather between the holes keeps enough body to resist stretching under load.

7. Bag Hardware Selection for Load-Bearing Points

Load-bearing points deserve their own pass, because a bag fails at the point that carries the most weight rather than at the point that looks weakest. A shoulder strap anchor, a handle attachment and a base corner plate all carry the full weight of the contents plus the swing of the bag, and each needs a reinforced joint.

The standard answer is a rivet over a reinforcement patch, backed by bar-tack stitching if the panel can take it. A single 9 mm cap rivet through two layers of 1680D with a 0.6 mm backing patch is a common specification for a strap anchor. Where the load is very high, two rivets 12 mm apart share it better than one larger rivet.

Two rivets share a load better than one large rivet because the panel between them resists rotation as well as pull. A single rivet carries the whole load through one hole, and a swinging bag can pivot that panel around it. Difei Button supplies cap rivets in pairs at 12 mm centres for strap anchors for that reason.

8. Bag Hardware Selection and Stock Planning

Bag hardware selection has a stock dimension that is easy to miss. Every finish, size and cap shape is a separate stock line, so a programme that uses four finishes across three positions can generate twelve stock lines for parts that differ by less than 2 mm. Consolidating to two finishes usually removes the problem.

The same logic applies to the eyelet and grommet range. Three inside diameters and two barrel lengths cover most bag and belt work, while a longer list of sizes means more setting dies on the bench and more chance of a mismatch. Difei Button (Guangzhou) Co Ltd keeps rivets, eyelets and grommets in a paired range so that a position can be changed from one part to another without changing the hole size. That single constraint removes most of the rework that follows a late specification change, and the same logic carries into the wider bag hardware selection.

Difei Button pairs the sizes for that reason, and a second benefit is fewer setting dies on the bench, since one die serves a position whether it is filled with a rivet or a matching eyelet. That matters most on a multi-position bag, where the bench otherwise holds a die for every part in the specification.

9. Frequently Asked Questions

9.1 What is the practical difference in rivet vs eyelet strength?

A rivet is the stronger part whenever two layers have to be held together, because the shank passes through both and is deformed over a washer, and its strength lies in shear across that shank. An eyelet is not designed to clamp anything, and its strength is in bearing against whatever passes through the barrel. Comparing the two on pull-off force therefore misleads, since they are measured against different loads. Choose by function first, then size the part against the load it will actually see.

9.2 How do I order the right grommet for belts and straps?

Measure the finished thickness of the material first, then add 1.0 to 1.5 mm to get the barrel length. Choose the flange at roughly three times the inside diameter so that the load spreads onto the surface. For 3.5 mm vegetable tanned leather a 5.0 mm barrel with a 10 mm flange is a sound starting point for most belt work. If a sample grommet rolls short or deforms at the flange, the barrel is too short for the material rather than too weak for the load.

9.3 Where does bag hardware selection start for a new programme?

Start from the panel and the position rather than from a parts catalogue. Measure the finished thickness including backing, note whether the position opens or stays closed, and estimate the working load. A joint position takes a rivet, a hole in thin stock takes an eyelet, and a hole in thick stock takes a grommet, while anything that has to open takes a snap or a hook. That order of questions settles most decisions in a bag hardware selection before a supplier is contacted.

9.4 Can an eyelet be substituted for a grommet to save weight?

In thin material yes, and in thick material no. An eyelet with an adequate barrel will do the same job as a small grommet on canvas webbing up to about 2 mm, and it saves weight on a lightweight bag. Above roughly 2.5 mm the barrel needed grows beyond what a standard eyelet range offers, and the flange becomes too narrow to spread the load. Substituting in thick stock is what produces the pulled-through holes that appear after a season of use.