Osg 1405009508 Thread Forming Tap 5/16-24 Unf Bottoming

Product Description

The OSG 1405009508 is a thread forming tap in the EXOTAP VP-NRT series, designed for cold-forming internal threads without cutting chips. Sized for 5/16-24 UNF threads with a bottoming chamfer of 1 to 1.5 thread pitches, this tap is suited for blind hole threading applications where full thread depth close to the bottom of the bore is required. Constructed from powdered metal high-speed steel and finished with a TiCN (Titanium Carbonitride) coating, it delivers extended tool life and improved wear resistance across a range of workpiece materials. Right-hand thread direction, Class 3B fit, Thread Limit H5.

This tap is used in production and maintenance machining environments where blind hole threading is performed in materials including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The thread forming process displaces material rather than cutting it, resulting in stronger thread forms and no chip evacuation concerns. It is well suited for CNC machining centers, drill presses, and tapping fixtures in both job shop and manufacturing settings.

Key Features

• Thread forming (chipless) design eliminates chip evacuation issues in blind holes
• Powdered metal high-speed steel construction for improved toughness and wear resistance over conventional HSS
• TiCN coating reduces friction and extends tool life in ferrous and non-ferrous materials
• Bottoming chamfer (1 to 1.5 thread pitches) allows threading close to the bottom of blind holes
• Class 3B fit with H5 thread limit ensures precise, consistent thread tolerance
• Compatible with alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum

Compatibility

Designed for blind hole threading applications in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Material application codes P, M, and N apply.

Installation Notes

Thread forming taps require proper tapping fluid or cutting oil matched to the workpiece material — do not run dry. Ensure the pilot hole diameter is sized for thread forming, which typically requires a larger hole than a cutting tap of the same thread specification. Secure the workpiece and use a tapping fixture or floating tap holder to maintain alignment and prevent tap breakage. Power down or de-energize any machine spindle before manually inspecting or changing the tap.