Value Collection JY4861241 Straight Flute Tap 1-1/16-18 Unef

Product Description

The VALUE COLLECTION JY4861241 is a straight flute bottoming tap designed to cut right-hand internal threads in through-holes and blind holes where full thread depth close to the bottom is required. Manufactured from high-speed steel with a bright/uncoated finish, it produces a 1-1/16-18 UNEF thread form to a 3B class of fit. The H4 thread limit keeps the tap within tight tolerance for consistent, gauged results. With four flutes and a bottoming chamfer, this tap is suited for machinists, toolroom technicians, and maintenance professionals working in steel, aluminum, and similar materials.

This tap is used in production and repair applications where an extra-fine 1-1/16-18 UNEF thread is required in a bottoming configuration. Typical scenarios include threading blind holes in machined components, fixtures, and assemblies where a standard or plug chamfer would not reach full thread depth. It is equally at home in a manual tapping setup or a CNC machine with appropriate feed control. The 5-1/8-inch overall length provides adequate reach for most standard workholding setups.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• 1-1/16-18 UNEF thread form with 3B class of fit for precise, gauged tolerance
• H4 thread limit for consistent oversize control in production runs
• Four straight flutes for chip clearance in through-hole and short blind-hole applications
• High-speed steel construction for durability across a range of workpiece materials
• Bright/uncoated finish — no coating stack to affect thread tolerance

Compatibility

Designed as an OEM-style replacement or direct-use tap for applications requiring a 1-1/16-18 UNEF right-hand internal thread with a bottoming chamfer and 3B class of fit.

Installation Notes

Tapping should be performed by a qualified machinist or toolroom technician using appropriate cutting fluid or tapping compound for the workpiece material. Ensure the workpiece is securely fixtured and the tap is properly aligned to the drilled hole before engagement to avoid tap breakage or thread damage. When tapping blind holes with a bottoming tap, clear chips frequently to prevent packing. Verify tap drill size against UNEF thread tables before beginning.