Osg 1704201 Spiral Flute Tap 5/16-24 Unf Modified Bottoming

Product Description

The OSG 1704201 is a spiral flute tap designed for cutting 5/16-24 UNF internal threads in demanding materials including alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloys. The modified bottoming chamfer allows threading close to the bottom of blind holes, making it a practical choice for tight-tolerance fastener applications. Manufactured from powdered metal and finished with a steam oxide coating, the tap offers improved lubricity and chip evacuation. Three right-hand spiral flutes with a 15-degree helix angle pull chips up and out of the hole during cutting, reducing the risk of tap breakage in difficult materials.

This tap is suited for production machining, maintenance, and repair operations where UNF threads in harder or more abrasive workpiece materials are required. The H6 thread limit designation indicates a tighter tolerance class, appropriate for applications demanding precise thread fit. Series 313 from OSG, it is commonly used by machinists, toolmakers, and maintenance technicians working on aerospace, automotive, and industrial components where thread quality and consistency are critical.

Key Features

• 5/16-24 UNF thread form with H6 thread limit for tight-tolerance thread production
• Modified bottoming chamfer for threading near the bottom of blind holes
• Three right-hand spiral flutes at a 15-degree helix angle for upward chip evacuation
• Powdered metal construction for increased hardness and wear resistance in difficult materials
• Steam oxide coating improves lubricity and reduces galling during cutting
• Compatible with alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloys

Compatibility

Rated for use in alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloy workpiece materials. Designed for 5/16-24 UNF threaded holes in applications requiring H6 thread tolerance class.

Installation Notes

Install and operate in a machine spindle or tap handle rated for the torque demands of the workpiece material. Ensure the workpiece is securely fixtured and the tap is properly aligned to the drilled pilot hole before engaging. Use an appropriate cutting fluid or tapping compound for the specific workpiece material to extend tool life and improve thread quality. Inspect the tap for wear or chipping regularly, especially when working in hardened or high-nickel alloy materials.