Description
The SpecialInsert F1CB38 fastener provides a 1/4-20 female thread on a 38 mm round base that can be bonded to a panel or molded into a structure. Its closed-back form keeps the rear of the threaded nut separated from the bonding area, making it useful when the assembly needs a blind female attachment point without drilling through the finished face.
Where the SpecialInsert F1CB38 fastener fits
This F1-series nut creates a removable bolted connection after the base has been fixed to the substrate. It can support access panels, covers, brackets, interior fixtures, trim, and other components that may need service later. The round base spreads the attachment area beyond the thread itself, while the closed-back construction suits blind-hole layouts where the fastener cannot be reached from behind.
The fastener is intended for adhesive-bonded assembly or molding processes. That approach lets fabricators place a threaded point on metal, plastic, composite, wood, natural stone, or engineered stone without cutting a through-hole in the visible surface. Final adhesive selection, surface preparation, bond-line thickness, and cure time must follow the adhesive supplier’s instructions for the actual substrate pair and service conditions.
Installation and assembly sequence
- Confirm that the 1/4-20 internal thread, 38 mm base diameter, and available clearance match the mating hardware and panel layout.
- Clean and prepare the base and substrate according to the selected adhesive system.
- Apply enough adhesive to wet the bonding surface without filling the female thread.
- Position the fastener, hold it in alignment, and allow the adhesive to cure before installing or loading the mating bolt.
- Use a bolt length that engages the thread without bottoming inside the closed back.
Product specifications
| Attribute | Value |
|---|---|
| SKU | CCH-F1CB38-1/4-20 |
| Series | SpecialInsert F1 female hex nut |
| Thread | 1/4-20 imperial |
| Base | 38 mm (1.5 in) round |
| Base style | Closed back |
| Material | Zinc-plated steel |
| Attachment method | Adhesive bonding or molding into the structure |
For related threaded attachment options, compare the bonding fastener range. Additional family information is available from SpecialInsert fastening resources.
Need Help?
Need help matching the thread, adhesive, or panel layout? Call (800) 220-1966 or email [email protected].
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