It spreads load on the accessible face; a peel rivet spreads it on the blind face.

The two solve the same class of problem on opposite sides of the joint.

A large flange stops the head pulling through or sinking into soft near-side material.

Peel legs stop the formed head pulling through soft far-side material.

Where both faces are soft, a large-flange peel rivet combines the two.

Choosing between them starts with asking which side is the weak one.

Soft or thin accessible material, enlarged holes, and anywhere the flange must trap something against the panel.

Plastics, fibreboard and thin sheet all let a standard flange sink in and lose clamp.

Holes enlarged by wear, corrosion or a previously removed rivet are no longer covered by a standard head.

Membranes, meshes, washers and cable retention all need a flange wide enough to hold them.

It is often the difference between a repair in place and moving the fixing position.

In sound steel sheet with a correct hole, a standard flange is entirely adequate.

It adds bearing area, not strength - grip range, hole size and shear capacity come from the body.

The body is unchanged from the equivalent standard rivet.

Shear is carried across the body's diameter regardless of the head size.

What improves is resistance to the head pulling through the near-side material.

In a joint where the sheet is the weak part, that can be the governing improvement.

Where the rivet body is the limit, a larger diameter or a structural rivet is needed.

Often yes, by bearing on sound material either side of the damage.

That avoids moving the fixing position, which is frequently impossible.

The body must still fill the hole reasonably or the joint will have play.

Where the hole is very enlarged, a larger diameter rivet with a large flange is the combination.

In torn material the flange bridges rather than repairs - the section is still lost.

Repeated damage at the same fixing means the load exceeds what the material can carry.

It needs surface area, it stands proud, and it shows.

A tight position may not have room for the larger head.

On a visible face an oversized flange is conspicuous.

The greater height catches on things and can be a snagging point.

Availability is narrower than for standard flanges, particularly in less common materials.

Where appearance matters and the material is sound, a standard flange with a washer under it is sometimes neater.

Large flanges appear across the families, though availability narrows as features are combined.

Closed-end large-flange rivets exist where a seal and a wide bearing face are both needed.

Peel rivets with large flanges are a standard combination for plastics and composites.

Structural rivets are less commonly offered with oversized flanges, since their duty is different.

Combining features raises cost and lead time.

Checking availability before designing around a combination avoids a late substitution.

Yes, and it is common practice - though a purpose-made flange is neater and does not come loose during setting.

A backing washer under the flange achieves much the same bearing area.

It is an extra part to hold in place while setting, which is awkward one-handed.

Washers can also shift during setting and end up partly off the hole.

On the blind side, a washer over the mandrel before insertion is the equivalent trick and is genuinely useful in repair.

For repeated production work the purpose-made rivet is faster and more consistent.