Dorian Tool 73310190479 Negative Lock Pin Indexable Tools

Product Description

The DORIAN TOOL 73310190479 is a negative lock pin designed to secure indexable inserts in turning and threading tool holders. With a 1/2-inch inscribed circle (IC) rating, a 3/32-inch hex socket drive, and a 1/4-28 threaded shank, this pin clamps inserts firmly against the tool pocket seat during cutting operations. The overall length is 0.672 inches. Machinists and tool crib personnel rely on this hardware to maintain insert positioning and prevent rotation or lift under cutting loads. The industry standard number for this pin is NL46.

This pin is used in indexable threading and turning toolholders that accept negative-lock style clamping hardware. It is appropriate for use in production machining environments, job shops, and maintenance turning applications where insert security and repeatability are critical. The 1/4-28 thread size is a common standard in toolholder insert-lock systems, making this pin a direct-fit replacement or service spare for compatible holders.

Key Features

• Negative lock pin design secures indexable inserts against rotation and lift during cutting
• 1/2-inch inscribed circle (IC) rating matches standard insert sizing
• 3/32-inch hex socket drive for precise, torque-controlled installation with a hex key
• 1/4-28 threaded shank meets common toolholder hardware standards
• 0.672-inch overall length suits standard toolholder pocket depths
• Industry standard number NL46 for cross-referencing compatible holders and inserts

Compatibility

Compatible with indexable inserts as specified in supplier data. Industry standard number NL46 may be used to identify compatible toolholders and insert systems. Designed as a service hardware component for negative-lock style indexable turning and threading toolholders.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Before replacing or seating the lock pin, ensure the machine spindle is powered down and the tool is secured in a vise or tool block. Use the correct 3/32-inch hex key to drive the 1/4-28 threaded pin to the toolholder manufacturer's recommended seating condition. Inspect the insert pocket and seating surfaces for chips or debris before installing the insert and seating the pin.