Osg 1625514026 Thread Forming Tap 1/4-20 Unc 2B H6

Product Description

The OSG 1625514026 is a thread forming tap designed for cutting 1/4-20 UNC internal threads in a wide range of metals. Unlike cutting taps, thread forming taps displace material rather than remove chips, producing stronger threads with better surface finish. This tap features a semi-bottoming chamfer, right-hand thread direction, and an H6 thread limit. It is manufactured from cobalt high speed steel for extended tool life in demanding production and maintenance environments. Overall length is 5.906 inches with a thread length of 0.526 inches and a neck length of 1.207 inches. Machinists, tool and die makers, and maintenance technicians install this tap in manual or CNC tapping operations.

This tap is suited for threading operations in both production shops and field maintenance settings. The cobalt material construction makes it appropriate for use in materials including aluminum, cast aluminum, carbon steel, alloy steel, die steel, hardened steel, stainless steel, high-nickel alloy, and titanium. The 2B class of fit is standard for general-purpose inch-series threaded fastener applications. The semi-bottoming chamfer allows threading closer to the bottom of a blind hole than a plug chamfer, making this tap a practical choice where thread depth is a constraint.

Key Features

• Thread forming design displaces material for stronger, chip-free threads
• Cobalt high speed steel construction for extended tool life in hard and abrasive materials
• Semi-bottoming chamfer for threading near the bottom of blind holes
• H6 thread limit for consistent 2B class of fit on 1/4-20 UNC threads
• Right-hand thread direction, compatible with standard tapping fixtures and CNC tapping heads
• V coating finish to reduce friction and improve tap life

Compatibility

Designed for producing 1/4-20 UNC 2B internal threads in aluminum, cast aluminum, carbon steel, alloy steel, die steel, hardened steel, stainless steel, high-nickel alloy, and titanium workpieces using standard tapping equipment.

Installation Notes

Thread forming taps require a specific forming tap drill size, which differs from standard cut tap drill sizes — consult a forming tap drill chart before drilling the pilot hole. Use appropriate tapping fluid or cutting oil matched to the workpiece material; dry tapping is not recommended for most metals. Ensure the workpiece is securely fixtured and the tap is aligned perpendicular to the hole to avoid tap breakage. Installation is performed by machinists and maintenance technicians using standard tapping handles, drill presses, or CNC machining centers.