SelfSert-SB Tri-Slot Self-Tapping Insert M20×27 Carbon Steel
SelfSert-SB (SelfSert-SB self-tapping insert with cutting holes) SSB-M20×27, internal thread M20, external thread E 26 mm, pitch P 2 mm, length B 27 mm, recommended drill diameter 25.2–25.4 mm, minimum drill depth 31 mm. Self-tapping threaded insert with cutting holes; driven straight into the workpiece without pre-tapping, suitable for aluminium alloys and die-cast parts. Volume pricing is negotiable.
| Features | Self-tapping installation |
|---|---|
| Thread Diameter | M20 |
| Thread Standard | ISO metric thread |
| Material | Case-hardened steel |
| Finish | Blue zinc passivated |
| Environmental Compliance | REACH and RoHS compliant |
Overview
A SelfSert-SB insert is a self-tapping threaded insert with an external thread that cuts or forms its own mating thread in the parent material as it is driven in. No separate tapping operation is required, so the insert can be installed in one step on a assembly line, and the forming action work-hardens the surrounding material in ductile alloys. This listing: thread M20, standard ISO metric thread, material Case-hardened steel, finish Blue zinc passivated, features Self-tapping installation.
What sets this listing apart: Thread Diameter M20 (series runs M3 to M24).
Advantages
No chip generation in forming mode, which matters on sealed housings where a metal chip would remain inside the product.
A defined shoulder stops the insert at a repeatable depth, so installed height does not depend on operator feel.
Eliminates the separate tapping operation, removing one station, one tool and one inspection point from the assembly sequence.
In ductile materials the external thread forms rather than cuts, displacing material into the thread flanks and leaving a compressive residual stress that improves pull-out strength.
Applications
Die-cast aluminium and zinc housings assembled in volume, appliance and power-tool casings, automotive interior modules, and any moulded boss that needs a serviceable thread without a pre-tapping step.
Forming inserts need a smaller pilot hole than cutting inserts, and the hole diameter is material-specific. Specify the parent material when ordering; using a cutting-type pilot hole with a forming insert will strip the boss.
Product information is supplied by Toprecision. Custom parts can be produced to drawing — contact us for samples or a quotation.
Specifications across this series
25 parts in this series
Values are taken from each part’s own attribute set. Changing length, material or finish changes pull-out strength and installation torque, so compare the row that matches your drawing.
Selection and test data: engagement length, standards, salt-spray hours
FAQ
What are the key dimensions of this part?
Features Self-tapping installation, Thread Diameter M20, Thread Standard ISO metric thread, Material Case-hardened steel.
What material and finish is it supplied in?
Case-hardened steel; Blue zinc passivated.
What should I verify before ordering or installing it?
Forming inserts need a smaller pilot hole than cutting inserts, and the hole diameter is material-specific. Specify the parent material when ordering; using a cutting-type pilot hole with a forming insert will strip the boss.