Description
Square Rubber Caps with Flange for Tubular Profiles
Barbieri Rubber square rubber caps with flange are square-section caps with an external flange, designed to close square tubular profiles, frames and square pipes in metal fabrication, technical furniture, industrial frames and equipment. They are catalog rubber components, available in multiple sections, lengths and compounds.
| Code | A (mm) | B (mm) | Height E (mm) | Tot height D (mm) | Head thickness C (mm) |
| TAP 20 | 18 | 21 | 15 | 20 | 5 |
| TAP 22 | 22 | 26 | 19 | 23,5 | 4,5 |
| TAP 28 | 28 | 36 | 21 | 31 | 10 |
| TAP 38 | 38 | 46 | 21,5 | 31 | 9,5 |
| TAP 44 | 44 | 51 | 23 | 30 | 7 |
| TAP 60X60 | 60 | 60 | 0 | 15 | 15 |
| ETGQ94/94 | 93,5 | 100 | 19 | 24 | 5 |
What square caps with flange are for
Square caps with flange are used to close square or rectangular tubular profiles, plug square pipe ends, protect edges and prevent ingress of dirt and moisture. The external flange ensures flat closure and prevents the cap from sliding into the profile. They are widely used in metal fabrication, technical furniture, displays, machine frames, railings and metal structures.
Available compounds and typical hardness
The most common compounds are NR/SBR for general use, EPDM for outdoor exposure, NBR where oil is present, VMQ silicone for high temperatures. Typical hardness is 60-80 Shore A: the cap must be stiff enough to stay firmly in place yet elastic enough to absorb profile tolerances.
| Compound | Temperature range | Feature | Typical applications |
| EPDM | -40 / +100 °C | Water, steam, ozone resistance | Painting, outdoor |
| NBR (Nitrile) | -40 / +130 °C | Mineral oil resistance | Workshops, hydraulics |
| VMQ (Silicone) | -60 / +200 °C | High-T resistance, reusable | Oven painting, high-T |
| FKM (Viton®) | -10 / +180 °C | Aggressive oils, solvents | Chemical, automotive |
| NR / SBR | -50 / +90 °C | Good mechanical elasticity | General caps, masking |
Catalog standard version and custom designs
The standard range covers all the most recurrent square sections, with active tooling at Barbieri Rubber. For special rectangular sections, custom profiles, dedicated compounds or colors, we produce custom caps: at least a preliminary drawing from the customer is required. The dedicated mold is manufactured in cooperation with our trusted toolmaking partners.
Industrial applications
Square caps are used in metal fabrication, machine frames, technical furniture, railings, displays, fixtures, fences, shelving, benches and metal structures. They cover a recurrent need both in production and in installation and maintenance.
Frequently asked questions
What is the difference between square caps and round caps?
Square caps are designed for square or rectangular sections, round caps for circular holes. Both are available with a flange to ensure flat closure.
Are they available from stock?
Yes, the most recurrent square sections are standard catalog rubber components, with no tooling cost for the customer. For rectangular or custom profiles the custom-design version applies.
Do they resist outdoor exposure?
Yes, with the right compound. EPDM is the reference compound for UV, ozone and atmospheric agents. For harsher environments VMQ silicone and FKM (Viton®) are available.
Can I order square caps in a specific color?
Yes. On request we produce caps in dedicated colors for visual identification or aesthetic reasons. Coloring is agreed at order stage.
Grazie alla loro versatilità, i square caps rappresentano una soluzione affidabile per migliorare sicurezza, protezione e finitura dei componenti industriali, garantendo prestazioni costanti in ogni applicazione.
