Threaded insert | self-tapping | A1 | WS 9270

Do you need a threaded insert that works reliably in standard indoor and outdoor environments? The type 302 self-tapping threaded insert in stainless steel A1 is built to resist corrosion and maintain its strength over a long period. It combines low weight with high breaking strength and is optimized to withstand heavy mechanical loads and frequent use.

APPLICATION AREA

Perfect for fastening in metal, wood, plastic, or lighter structures in machinery, appliances, or industrial environments. The self-tapping design provides a stable and vibration-proof connection without the need for additional hardware. Easy to install with a screwdriver or bit and requires minimal maintenance even during continuous operation.

TECHNICAL SPECIFICATIONS

Product type: Threaded insert
Standard: Non-standardized (type 302, self-tapping)
Grade: Stainless steel A1
Material class: Not specified
Thread type: Cutting thread
Surface treatment: Untreated (natural stainless steel)
Head shape: Cylindrical
Drive type: Not applicable

FREQUENTLY ASKED QUESTIONS (FAQ)

How does a type 302 self-tapping threaded insert work during installation?

The type 302 threaded insert features a special external thread combined with cutting slots (or holes) at the bottom end. When the insert is screwed into a pre-drilled hole, it cuts its own mating thread into the material. This creates a very strong, stress-free, and play-free anchorage that distributes the load evenly over the entire contact surface.

In which materials is the type 302 threaded insert most suitable for use?

It is ideal for softer metals and plastic materials where standard threads are easily stripped or worn out during repeated use, for example:

• Aluminum and aluminum alloys

• Brass, cast iron, and copper

• Structural plastics and composite materials

Thanks to the insert's self-tapping capability, you avoid the need for separate threading with a tap before installation.

Why are self-tapping inserts often manufactured in stainless steel A1 (AISI 303) rather than A2/A4?

Stainless steel A1 (AISI 303 / 1.4305) contains sulfur additives that provide good machinability during production (free-cutting steel). This allows the insert's fine threads and cutting slots to be manufactured with high precision. A1 has slightly lower corrosion resistance than A2 and A4 and is intended for standard indoor and outdoor environments – not for marine or chloride-containing environments.