21 mm / 0.827 in Flat Brass Grommet ERD0032PR

Designed for workshops and production planning, this flat brass grommet creates a large circular passage in tarpaulins, curtains, tents, banners and compatible technical textiles. Its flat face provides a clean metal surround without the raised appearance of a domed model.

Production specification

Optional washer specification

Pre-production approval points

• Actual opening required by the cord, hook or attachment
• Compressed thickness of all substrate layers
• Need for a rear metal washer
• Eyelet and washer compatibility with the setting die
• Press connection and available operating force
• Pull direction and reinforcement around the installation point
• Finish performance in the intended environment

Recommended workshop sequence

1. Build a sample using the same substrate and reinforcement as the final product.
2. Prepare the hole with a compatible punching die.
3. Insert the grommet barrel through the visible face.
4. Add the metal washer when specified.
5. Set the assembly with a matched upper and lower die.
6. Inspect barrel roll, washer seating, rotation and substrate damage.
7. Perform a pull test in the actual load direction.

Die-selection requirement

The correct setting die must support the flat 31.8 mm / 1.252 in face while forming the 4.7 mm / 0.185 in barrel around the selected washer. A generic die chosen only from a commercial product number can deform the rim or close the barrel unevenly.

No exact live setting-die listing was verified specifically for this product. Provide the product code and full measurements when requesting a die match.

Possible production uses

• Tarpaulin and protective-cover reinforcement
• Awning and tent attachment points
• Curtain and stage-textile openings
• Banner and vinyl-display suspension
• Large drawstring openings in bags and covers
• Decorative passages in leather and textile panels

Material and environmental note

The base material is brass, not stainless steel. Plated colour does not establish corrosion performance. Approve the finish on a real sample when the finished product will be exposed to moisture, salt, cleaning chemicals or long-term outdoor conditions.

Incorrect-selection warning

The 4.7 mm / 0.185 in barrel is not a maximum-substrate-thickness rating. A closing allowance is required after the barrel passes through the material and washer. Excessive thickness may prevent correct rolling; insufficient thickness may produce a loose installation.

Related E-Buttons pages

• Flat brass eyelets and grommets
• Eyelets and grommets
• Setting dies, punching tools and presses

Frequently asked questions

Is this listing for 500 complete eyelet-and-washer sets?

No. The base listing contains 500 grommet bodies. The metal washer is a separate option.

What is the usable opening?

The verified opening is 21 mm / 0.827 in.

Why is the outside diameter important?

The 31.8 mm / 1.252 in outside diameter affects visible coverage, edge clearance and setting-die support.

Can material thickness be calculated directly from the barrel height?

No. Material compression, washer thickness and the barrel length required for closing must all be considered.

Does the product include a punching or setting die?

No. Punching dies, setting dies and press machines must be selected separately.

Can it be used for certified load-bearing points?

No certified load rating is stated. Test the completed assembly, reinforcement and spacing for the intended load.

Are all 21 mm setting dies interchangeable?

No. The die must match the face profile, outer diameter, barrel height, washer and press connection.