Value Collection -20550-16 Square End Mill 1 in 4 Flute Hss

Product Description

The VALUE COLLECTION -20550-16 is a single-end square end mill designed for general-purpose milling operations in metal and alloy materials. Constructed from high speed steel (HSS) with a titanium nitride (TiN) coating, it delivers improved wear resistance and longer tool life compared to uncoated HSS tooling. The 1-inch diameter cutting head features 4 spiral flutes with a 30-degree helix angle and right-hand cutting and flute direction. With a 1-7/8-inch length of cut and 4-1/8-inch overall length, this end mill suits a range of slotting, profiling, and peripheral milling applications. It is centercutting, allowing direct plunge entry into workpieces. Licensed machinists and toolroom operators are the primary users.

This end mill is suited for use in manual knee mills, CNC vertical machining centers, and toolroom lathes with milling attachments. The 3/4-inch shank diameter fits standard R8, CAT, BT, and side-lock holders commonly found in job shop and production environments. The TiN coating makes it appropriate for cutting mild steel, alloy steel, aluminum, and similar machinable materials where moderate heat and abrasion resistance are needed. It is a single-end tool and is not designed for extended-reach applications.

Key Features

• 1-inch cutting diameter with 1-7/8-inch length of cut for deep slot and profile milling
• 4-flute spiral geometry with 30-degree right-hand helix for efficient chip evacuation
• High speed steel construction provides toughness in interrupted-cut and general-purpose milling
• Titanium nitride (TiN) coating increases surface hardness and reduces friction at the cutting edge
• Centercutting design allows plunge milling without a pre-drilled pilot hole
• 3/4-inch shank diameter for compatibility with standard milling machine toolholders

Compatibility

Designed as a general-purpose replacement or stock end mill for use in standard 3/4-inch bore toolholders on vertical and horizontal milling machines. No specific OEM or machine model compatibility was stated in the product data.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and locked out before mounting or removing the end mill. Seat the shank fully into the toolholder and tighten set screws or collet nuts to the holder manufacturer's specification. Inspect the cutting edges for chips or damage before use and confirm proper coolant flow if required by the application.