Kennametal 4130689 Hand Tap 3/4-16 Unf Plug Tin Hss

Product Description

The KENNAMETAL 4130689 is a 3/4-16 UNF straight flute hand tap designed for cutting internal threads in ferrous and alloy materials. Built from high-speed steel (HSS) with a titanium nitride (TiN) coating, it delivers extended wear resistance and reduced friction during tapping operations. The plug chamfer (3-5 threads) eases starting in through-holes and blind holes where some lead-in is acceptable. With a 4-flute configuration and right-hand thread direction, this tap is suited for stable chip management in medium-to-hard materials. Overall length is 4.25 inches with a 2-inch thread length and a 0.59-inch shank diameter. It is typically used by machinists and maintenance technicians working in production or repair environments.

This tap is suited for threading operations in cast iron, stainless steel, and steel workpieces. It is used in machine shops, manufacturing facilities, and industrial maintenance settings where 3/4-16 UNF threads are required. The TiN coating makes it a practical choice when working with abrasive or work-hardening materials that accelerate tool wear on uncoated taps. The 3B class of fit and H3 thread limit produce threads within standard tolerances for most mechanical fastener applications.

Key Features

• 3/4-16 UNF right-hand thread form for standard unified fine-pitch threading
• Plug chamfer with 3-5 lead threads for use in through-holes and accessible blind holes
• TiN coating extends tool life when tapping cast iron, stainless steel, and alloy steel
• 4-flute straight flute geometry provides stable cutting and chip clearance
• H3 thread limit and 3B class of fit for standard tolerance threaded connections
• High-speed steel construction handles intermittent cutting loads in hand or machine tapping

Compatibility

Designed as an OEM-style replacement or direct tooling selection for applications requiring 3/4-16 UNF internal threads in cast iron, stainless steel, and steel workpieces per the class 3B fit standard.

Installation Notes

This tap is installed by licensed machinists or qualified maintenance technicians using a tap wrench or machine tapping setup. Secure the workpiece before starting and ensure the tap is aligned square to the hole to prevent tap breakage or cross-threading. Apply appropriate cutting fluid for the material being tapped, particularly with stainless steel, to reduce galling and heat buildup. Never force a tap that has stalled or seized — back out and clear chips before continuing.