Carmex 16ER12STACMEP30 Threading Insert 12 Tpi Stub Acme

Product Description

The CARMEX 16ER12STACMEP30 is a laydown-style indexable threading insert designed for cutting external Stub Acme threads on a lathe or CNC turning center. Manufactured from uncoated solid carbide at grade P30 (material grade C5), this insert delivers consistent thread form on moderate-speed steel and cast iron applications. It cuts at 12 threads per inch and features a 3/8 inch inscribed circle with a thickness of 0.146 inches. Right-hand orientation makes it a standard fit for conventional external threading operations. Machinists and CNC operators working with Stub Acme thread forms will find this insert delivers repeatable results without the added cost of a coating on materials that do not require it.

This insert is suited for external Stub Acme threading operations in job shop, production, and maintenance machining environments. Stub Acme threads are commonly used on lead screws, power transmission components, and mechanical actuators where a full Acme form is not required. The 16ER style seating geometry fits compatible 16ER toolholders used across manual and CNC lathes. It is sold individually per package, with a minimum order quantity of 10 pieces, making it appropriate for shops that keep a working inventory of threading inserts on hand.

Key Features

• Solid carbide construction at P30/C5 grade for consistent performance on steel and cast iron
• Uncoated finish suitable for applications where coating is not required or preferred
• 12 TPI Stub Acme thread form for external threading operations
• Right-hand cutting orientation for standard lathe setups
• 3/8 inch (0.3750 inch) inscribed circle in 16ER laydown-style geometry
• 0.146 inch insert thickness for stable seating in compatible toolholders

Compatibility

Designed for use in 16ER-style external threading toolholders. Specific toolholder compatibility should be verified against the holder manufacturer's insert selection guide prior to installation.

Installation Notes

Threading inserts of this type are installed by qualified machinists or CNC operators. Ensure the machine spindle is fully stopped and the toolholder is secure before seating or indexing the insert. Use the correct torque wrench and clamping screw specified by the toolholder manufacturer to avoid cracking the carbide. Verify thread pitch and insert geometry match the required thread standard before beginning the cut.