Value Collection MSC-04619219 Spiral Flute Tap 1/4-20

Product Description

The VALUE COLLECTION MSC-04619219 is a spiral flute tap designed for cutting 1/4-20 UNC internal threads in blind holes and through holes where chip evacuation is critical. Built from high-speed steel with a bright, uncoated finish, this tap features three right-hand spiral flutes with a 45-degree helix angle and a fast flute style that pulls chips up and out of the hole during cutting. The modified bottoming chamfer allows threading close to the bottom of a blind hole. Overall length is 2.5 inches. Thread limit is H3, and the class of fit is 3B, making it suitable for standard-tolerance threaded fastener applications. Machinists and tool-and-die professionals install this tap in manual tap wrenches or CNC tapping operations.

This tap is used in general machining, fabrication, and maintenance environments where 1/4-20 UNC threads are required. The modified bottoming chamfer and fast flute geometry suit applications in blind holes where minimal runout at the thread bottom is needed. The right-hand thread direction and right-hand flute direction are standard for the majority of 1/4-20 threaded holes in steel, aluminum, and similar machinable materials. No coolant-through feature is present, so external coolant or cutting oil application is standard practice.

Key Features

• 1/4-20 UNC thread form with 3B class of fit for standard-tolerance applications
• 45-degree helix angle with fast spiral flute style promotes efficient chip evacuation in blind holes
• Modified bottoming chamfer allows threading closer to the bottom of a blind hole than a plug chamfer
• High-speed steel construction provides wear resistance in general-purpose tapping operations
• H3 thread limit for consistent, repeatable thread tolerance across production runs
• Bright, uncoated finish suitable for use with cutting oils and standard tapping fluids

Compatibility

Designed as a general-purpose replacement or addition for 1/4-20 UNC tapping operations in standard manual tap wrenches, tapping heads, and CNC machining centers capable of rigid tapping.

Installation Notes

This tap should be installed by a qualified machinist following shop-standard procedures for tap alignment and feed rate. Apply appropriate cutting fluid or tapping oil before and during the tapping operation to reduce heat and extend tool life. Ensure the workpiece is securely clamped and the tap is aligned perpendicular to the workpiece surface before beginning the cut. Never force a tap that has stalled — back off and clear chips before continuing to avoid breakage.