Value Collection JY4794566 Acme Thread Tap 7/8-6 2G 4 Flute

Product Description

The VALUE COLLECTION JY4794566 is a 7/8-6 Acme thread tap designed for cutting internal Acme threads in a right-hand direction. Built from high-speed steel with a bright uncoated finish, this tap handles the 29-degree thread angle characteristic of Acme thread forms. It features 4 straight flutes and a plug chamfer, making it suited for through-hole tapping applications where the tool needs to enter the work before full thread engagement begins. With an overall length of 8.625 inches and a thread length of 4.375 inches, this tap provides sufficient reach for deeper threading operations. Machinists and tool-and-die tradespeople use it in manual or CNC tapping operations on ferrous and non-ferrous materials.

This tap is used in applications where Acme thread forms are required, such as lead screws, power transmission components, and linear actuator assemblies. The 2G class of fit designates a general-purpose tolerance suited for most commercial Acme thread work. The plug chamfer style requires a starter hole and is best applied in through-hole or open-ended blind-hole situations. Tandem capability is noted, allowing use in tandem tap sets for progressive thread cutting sequences when thread depth demands it.

Key Features

• 7/8-6 Acme thread size with 29-degree thread angle for standard Acme thread form cutting
• High-speed steel construction for durability across a range of tapping materials
• 4 straight flutes with plug chamfer for through-hole and open blind-hole applications
• Right-hand thread direction, 2G class of fit for general-purpose commercial tolerance
• Overall length of 8.625 inches with 4.375 inches of usable thread length
• Bright uncoated finish; tandem-compatible for progressive tapping set use

Compatibility

Designed as an OEM-style tooling replacement or new-application tap for any operation requiring a 7/8-6 right-hand Acme internal thread with a 2G class of fit.

Installation Notes

This tap is installed by machinists and tool-and-die technicians using a tap wrench, tapping head, or CNC rigid tapping cycle. Ensure the workpiece is securely fixtured and the pilot hole diameter is correctly sized for the 7/8-6 Acme thread form before beginning. Apply appropriate cutting fluid for the workpiece material to reduce heat and extend tool life. Do not reverse the tap under load without clearing chips to avoid tap breakage.