Trimtex 350 Bull Corner Bead 3/8″ Radius 10′

Worth it for contractors who need fast bullnose installation without the setback hassle. The 350 Bull is unique for its ‘no setback’ feature, whereas most other bullnose beads require a 1/8” drywall setback. That single detail saves real time on every corner — no holding drywall back from the framing, no extra mudding to compensate. For archways, use the notched 350 Archway version to follow the curve without the need for additional mud coats to fill notches.

Skip it if you’re doing basic residential work where standard 90-degree corners work fine. This product shines in commercial settings where impact resistance and safer rounded corners justify the upgrade.

No-Setback Design Saves Labor

The 350 Bull is unique for its ‘no setback’ feature, whereas most other bullnose beads require a 1/8” drywall setback. Every other bullnose bead on the market makes you hold your drywall back an eighth-inch from the corner. Not this one. You hang drywall flush to the framing like normal, then install the bead directly. No measuring setbacks. No shimming. No arguing with the rocker about whether they held back enough.

Apply Trim-Tex 847 Spray Adhesive to the bead and the wall. Press the bead into place and secure with staples every 6-10 inches through the legs. That’s it. The installation runs exactly like standard corner bead, except you get a 3/8” radius bullnose when you’re done.

For archways, use the notched 350 Archway version to follow the curve without the need for additional mud coats to fill notches. Another time-saver — the archway version eliminates the fill coat you’d normally need to smooth out the notches. One less coat means one less day waiting for mud to dry.

Specification	Value
Radius	3/8 inch (9.5mm)
Length	10 feet (305 cm)
Box quantity	35 pieces per box (Standard 350 Bull)
Leg design	Extra-long legs (~1 1/8”)
Setback requirement	None (Unique ‘no setback’ design)

Built for Commercial Impact

Extra-long legs (~1 1/8”) for enhanced impact absorption make this bead tougher than standard corner products. Those long legs flex on impact instead of denting the corner. In high-traffic commercial spaces — hospitals, schools, airports — that flexibility prevents the corner damage that turns into callbacks.

Rigid PVC construction stands up to abuse and won’t rust or dent The vinyl construction means no rust streaks bleeding through paint in five years. No dents from carts, equipment, or general abuse. More durable and safer; resists cracking and chipping from corner impacts.

High-traffic commercial areas (hospitals, schools, airports) specifically benefit from the rounded profile. Safer, rounded corners ideal for healthcare and educational facilities where sharp corners pose liability issues. The 3/8” radius meets institutional safety requirements without looking like a padded room.

Class A (ASTM E84 flame spread and smoke rating) covers the fire rating requirements for most commercial projects. Montana commercial buildings need compliant materials, and this checks that box.

Technical Specifications

Certification	Standard
Rigid PVC standards	ASTM D3678 (Rigid PVC Interior-Profile Extrusions)
PVC compound requirements	ASTM D1784 (Rigid PVC Compounds)
Drywall accessory standards	ASTM C1047 (Drywall Accessories)
Fire rating	ASTM E84 (Class A Fire and Smoke Rating)
Environmental	LEED Eligible (Due to recycled content in PVC products)

Works with 1/2” and 5/8” drywall applications. Compatible with standard joint compound or specialized vinyl bead adhesives. The product works with your existing materials and methods — no special compounds or tools required beyond the spray adhesive.

Free Bullnose Cleaning Tool (one per box/case) Actually useful. Wipe the radius with the provided cleaning tool to remove excess mud during finishing. Run it along the radius after each mud coat for a consistent curve. Without it, you’re shaping bullnose by hand and hoping for uniformity.

Warranted by Trim-Tex to be free from defects in material and workmanship, and guaranteed against rust and cracking for the life of the structure when installed correctly. Lifetime warranty on a drywall accessory means something when you’re bidding commercial work.

FAQ

How does the no-setback feature actually save time?

The 350 Bull is unique for its ‘no setback’ feature, whereas most other bullnose beads require a 1/8” drywall setback. Standard bullnose beads require holding drywall back 1/8” from the framing at corners. That means measuring, marking, and cutting precisely — or shimming if the rocker didn’t hold back enough. This bead installs on flush-hung drywall, eliminating that entire step.

What’s different about the archway version?

For archways, use the notched 350 Archway version to follow the curve without the need for additional mud coats to fill notches. Pre-notched for flexibility, it bends smoothly around curves without requiring you to fill the notches with an extra coat of mud. Saves a full day of drying time on archway projects.

Is the 3/8” radius the right size for this application?

Provides a more subtle and contemporary aesthetic compared to the larger curve of the 3/4” radius. The 3/8” gives a softer corner without the pronounced bullnose look. Works well in modern commercial spaces and anywhere you need impact protection without announcing it.

How does installation differ from metal corner bead?

Dry fit to the corner; ensure no setback is present. Apply Trim-Tex 847 Spray Adhesive to the bead and the wall. Press the bead into place and secure with staples every 6-10 inches through the legs. Similar process but with spray adhesive instead of mud-on application. The vinyl won’t telegraph through like metal can.

What comes in each box?

35 pieces per box (Standard 350 Bull) of 10-foot lengths, plus Free Bullnose Cleaning Tool (one per box/case). 50 pieces per box (Mud-Set version) if you prefer that installation method.