Osg 1704108 Spiral Flute Tap 5/16-24 Unf Powdered Metal

Product Description

The OSG 1704108 is a spiral flute tap designed for threading 5/16-24 UNF right-hand internal threads in demanding materials. Built from powdered metal and finished with a TICN (titanium carbonitride) coating, this tap delivers high wear resistance and extended tool life compared to standard high-speed steel options. It features a modified bottoming chamfer for threading close to the bottom of blind holes. The 3-flute spiral design evacuates chips upward and out of the hole, reducing the risk of chip packing in short-chip materials. Overall length is 3.156 inches with a thread limit of H5, making it suitable for tight-tolerance threading applications. Licensed machinists and toolroom technicians are the primary users.

This tap is intended for threading operations in alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloys. The TICN coating provides lubricity and heat resistance that makes this tap particularly effective in difficult-to-machine materials where uncoated taps fail prematurely. It is suited for CNC machining centers, drill presses with tapping attachments, and dedicated tapping machines in production and job shop environments. The modified bottoming chamfer allows threading closer to the bottom of a blind hole than a standard plug chamfer, which is critical in close-tolerance assemblies.

Key Features

• 5/16-24 UNF thread form, right-hand, H5 thread limit for close-tolerance fits
• Modified bottoming chamfer for threading near the bottom of blind holes
• 3-flute spiral design with right-hand flute direction promotes upward chip evacuation
• Powdered metal construction for improved toughness and wear resistance over standard HSS
• TICN coating enhances lubricity and heat resistance in alloy steel, stainless, titanium, and high-nickel alloys
• 15-degree helix angle balances chip flow and cutting force in short-to-medium chip materials

Compatibility

Rated for use in alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloys as stated by the manufacturer. Designed as an OEM-specification spiral flute tap in the OSG EXOTAP Series 313 for 5/16-24 UNF threading applications.

Installation Notes

Installation of threaded inserts and tapped holes should be performed by qualified machinists following applicable shop safety procedures. Ensure the workpiece is securely fixtured and the spindle is properly aligned before beginning the tapping cycle. Coolant-through is not supported on this tap; apply cutting fluid externally and appropriate to the workpiece material. Always confirm the correct tap drill size for 5/16-24 UNF before drilling the pilot hole to achieve the intended thread engagement percentage.