Create a threaded interface
Provide a metal internal thread in a suitable parent material.
SELF-TAPPING INSERT · 302 / 302H
302/302H Self-Tapping Inserts
Form the connection as you install.
External cutting features engage a prepared pilot hole. Matching the hole to the parent material is essential for successful self-tapping installation.
DESIGNED FOR CONNECTION
A cutting structure that forms the connection as it turns.
Type 302 self-tapping inserts use cutting slots to form a mating external thread in a suitable parent material as they are installed, while providing an internal screw thread. Pre-tapping requirements and pilot-hole dimensions depend on the material and approved process. Self-tapping does not mean that any hole size is suitable.
Match the pilot hole
Set hole diameter and depth according to material condition.
Compare alternatives
Evaluate headed and headless designs according to available space.
01 / STRUCTURE
Start with the right structure.
The insert structure determines how the 302/302H series connects and installs.
Type 302
Slotted cutting structure; select with regard to the parent material and pilot hole.
Type 302H
Confirm the meaning of the H suffix and the dimensions against the drawing.
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02 / MATERIAL
Match the material to the conditions.
These material options are discussion points; not every model is available in every combination.
Stainless steel
Confirm grade, strength and corrosion resistance against the supply drawing.
Other materials
Discuss the parent material, environment and connection loads.
Material documentation
Specify the material standard and required inspection documents in the order.
03 / SURFACE
The finish is part of the connection.
Consider friction, corrosion resistance and identification in the operating environment. Confirm available combinations with an engineer.
Surface condition
Confirm whether lubrication, protection or another treatment is needed.
Mating compatibility
Check the combination of parent material, screw, media and surface treatments.
Made to drawing
Include treatment type and thickness in dimensional and acceptance requirements.
INSTALLATION
From preparation to final inspection.
Confirm the material and hole
Check the parent material, pilot hole and effective depth.
Mount on the installation tool
Maintain secure engagement between the tool and insert.
Install in alignment
Maintain alignment and control insertion according to the approved procedure.
Inspection and cleaning
Check the installed position and remove machining debris.
Actual dimensions, tools and processes are subject to the approved product drawing and technical agreement.
CONFIGURATION
Bring your requirements to our engineers.
Choose a preferred configuration and add thread size and operating conditions. This is an engineering enquiry, not a confirmed supply configuration.
Confirm these details for a clearer discussion.
302 / 302H
Existing model names are retained. Confirm the meaning of the H suffix against the ZCOIL drawing.
Parent material and pilot hole
Determine according to hardness and machining method.
Cutting and chip removal
Allow space for cutting and cleaning.
Geometry and material
Check outside diameter, length, head geometry and material.
KNOWLEDGE & RESOURCES
Explore further.
Frequently asked questions
Does self-tapping mean no pilot hole is needed?
A suitable pilot hole is still required. Whether pre-tapping is needed depends on the material and installation process.
Can I select a 302H using another brand's model designation?
No. Suffixes and dimensions may follow each manufacturer's own naming system. Check the ZCOIL drawing.