Accupro 40604-MG EL-4 Left Hand Offset Threading Tool Bit

Product Description

The ACCUPRO 40604-MG is a left-hand, single-point offset threading tool bit designed for precision threading and V-grooving operations on metal lathes and turning centers. Built to the EL-4 industry standard, it features a micrograin solid carbide tip brazed to a 1/4 inch by 1/4 inch shank and measures 2 inches overall length. The micrograin carbide grade delivers fine edge retention and consistent thread form geometry, making it well suited for close-tolerance threading work. Machinists and toolroom technicians working with ferrous and non-ferrous materials will find this bit reliable for threading to a shoulder where clearance is limited.

This tool bit is used in threading and V-grooving applications on manual and CNC lathes. The EL-style offset geometry allows threading up to a shoulder, reducing relief grinding requirements. The left-hand cutting direction is appropriate for operations where the tool moves from the chuck toward the tailstock or for specific right-hand thread profiles depending on machine setup. It is sized for small-bore and light-duty threading passes common in job shop, maintenance, and production turning environments.

Key Features

• EL-4 industry standard offset threading profile
• Left-hand cutting direction for shoulder threading operations
• Micrograin solid carbide tip for extended edge life and fine surface finish
• 1/4 inch shank height by 1/4 inch shank width for compact tool holders
• 60-degree included angle compatible with standard unified and metric thread forms
• 2 inch overall length for use in tight clearance setups

Compatibility

Designed as an OEM-style single-point threading tool bit fitting standard 1/4 inch tool holders and lathe tool posts that accept EL-style brazed carbide bits.

Installation Notes

Installation and tool setting should be performed by a qualified machinist following shop safety procedures. Ensure the lathe spindle is fully stopped and locked out before seating or adjusting the tool bit in its holder. Set the tool tip on or slightly below center height per standard threading practice and verify the included angle alignment with a thread gauge before taking a cut. Inspect the carbide tip for chips or cracks before each use and replace the bit if tip integrity is compromised.