Description
This bonding fastener is a SpecialInsert F2 Female B23 threaded stud, a no-drill fastening point that bonds directly to a panel surface instead of requiring a drilled and tapped hole. The 23 mm round base carries a female 1/4-20 thread with a 1/2 inch collar height, and the zinc plated steel body resists corrosion in shop and field environments. It bonds to metal, plastic, and composite panels with a structural adhesive rather than mechanical hardware, which keeps the back side of the panel free of protruding bolts or rivets. A pack ships with a single stud per unit, so quantities scale directly with the number of mounting points on the job.
Where This Bonding Fastener Gets Used
Fabricators use this hardware anywhere a threaded mounting point has to go on a finished panel without drilling through it. Common jobs include sign fabrication, cabinet and display assembly, countertop bracket mounting, and composite or thin sheet metal panels where a through hole would compromise strength or looks. The stud collar height, 1/2 inch, sets a fixed standoff so mounting hardware threads in consistently every time, and the female thread accepts a bolt from the finished side rather than requiring a pin welded through the panel. Round base geometry also spreads clamping force evenly during cure, which helps on curved or slightly uneven surfaces.
Why This Bonding Fastener Holds
Bonding, not welding or drilling, is what gives this stud its strength. A structural adhesive bond spreads load across the full base area rather than concentrating stress at a single hole, which lowers the risk of panel cracking or thread pull-out under vibration. Zinc plating on the steel body blocks the galvanic corrosion that shows up when bare steel sits against aluminum or other dissimilar metals in a damp environment. Skipping the weld also means no heat distortion on thin panels and no open flame or arc hazard in enclosed work areas. Open back construction keeps the base surface simple, which helps adhesive wet out fully across the 23 mm footprint during install.
Bonding Fastener Specifications
| Property | Value |
|---|---|
| Type | Female threaded, no-drill install |
| Base Shape | B23, 23mm round |
| Thread | 1/4-20 |
| Collar Length | 1/2 in |
| Material | Zinc plated steel |
| Back Style | Open back (standard) |
| Weight | 0.3 lbs |
Surface prep matters as much as the hardware itself. Clean and lightly abrade the bond area before applying adhesive, then clamp or weight the fastener in place until the bond reaches handling strength before moving the panel. Browse the full no-drill fastener lineup for matching male, female, and specialty base styles in other thread sizes and collar heights. For engineering background on threaded insert options and installation methods, see Specialinsert.
Need Help?
Need help picking collar height or base shape for your panel thickness? Call (800) 220-1966 or email [email protected].
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