Product Center · Self-Tapping Thread Inserts

Type 302 Slotted Self-Tapping Threaded Inserts

Type 302 slotted self-tapping insert: an open slot along the barrel provides the cutting edge and allows the wall to flex as it cuts.

Key specifications

MaterialStainless Steel / Carbon Steel
Installationdriven directly into the pilot hole (self-threading)
StandardGB/T 197 (6H internal thread), company standard
Typical substratealuminium, zinc alloy, engineering plastics
Key inspectionsdriving torque, internal thread gauging, failure torque

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Product overviewOverview

The external thread of a self-tapping insert is a cutting tool. The slot does two jobs: it forms the cutting edge and it lets the barrel contract slightly, which reduces the risk of splitting a thin-walled boss. Because the slot interrupts the thread, the number of load-carrying turns is lower than on a closed-body insert of the same length.

Material: Stainless Steel / Carbon Steel. It is driven straight into the pilot hole and cuts its own thread.

Key featuresFeatures

Slot cuts and allows wall flex; it also interrupts the thread.
Carburised or alloy steel with zinc passivation; internal thread to 6H.
M2–M4 with length and thread combinations made to drawing.
Cuts its own thread in a drilled hole, eliminating the tapping operation.

Typical applicationsApplications

Engineering plastic reinforcement
Automotive lightweight structures
Electronic enclosures

Selection notesSelection

Allow for the interrupted thread when choosing length, and avoid thin-walled bosses where the slot reduces the supporting section further.

Frequently asked questionsFAQ

Does the slot weaken the insert?

It reduces the number of continuous load-carrying turns, so a slightly longer insert is used to compensate. The benefit is that the wall can flex while cutting, which protects thin bosses.

What matters during installation of the Type 302 Slotted Self-Tapping Threaded Inserts?

Drive it straight into the pilot hole so it cuts its own thread. Slot cuts and allows wall flex; it also interrupts the thread.

Specifications

Material	Stainless Steel / Carbon Steel
Type	Self-tapping threaded insert
Standard	GB/T 197 (6H internal thread), company standard
Drive	slotted
Installation	driven directly into the pilot hole (self-threading)
Typical substrate	aluminium, zinc alloy, engineering plastics
Key inspections	driving torque, internal thread gauging, failure torque

Manufacturing and inspection

Carburised parts are checked for case depth and hardness; plating to GB/T 5267.1.Material certificates and dimensional records accompany each lot; material and dimensional records are supplied per batch.