Hertel 87028 Hand Tap 1-5/8-8 Uns Plug 6-flute Hss

Product Description

The HERTEL 87028 is a straight-flute hand tap designed for cutting 1-5/8-8 UNS internal threads in a wide range of materials. Built from high speed steel (HSS) with a bright uncoated finish, it delivers reliable thread cutting performance in production and maintenance applications. The plug chamfer — typically 3 to 5 threads of lead — provides a balanced starting action suitable for through holes and deeper blind holes where a bottoming tap is not required. With 6 flutes, this tap distributes cutting forces evenly and clears chips efficiently during hand or machine tapping operations.

This tap is suited for threading operations in industrial maintenance, toolroom work, and production environments where 1-5/8-8 UNS thread profiles are required. The UNS thread standard covers unified national special pitch combinations not found in the standard UNC or UNF series, making this tap appropriate for specialized fastener applications in heavy equipment, custom fixtures, and retrofit assemblies. It is typically installed by machinists, toolroom technicians, and skilled maintenance tradespeople using a standard tap wrench or tapping fixture.

Key Features

• 1-5/8-8 UNS thread form — unified national special pitch for non-standard thread requirements
• Plug chamfer with 3 to 5 thread lead for controlled entry in through holes and deep blind holes
• 6-flute design distributes cutting load and improves chip evacuation
• High speed steel construction provides heat resistance and edge retention during tapping
• Bright uncoated finish — no coating buildup that can affect thread tolerance in precision fits
• H6 thread limit for controlled fit class in close-tolerance threading applications

Compatibility

Designed as an OEM-style hand tap for applications requiring a 1-5/8-8 UNS right-hand internal thread. Compatible with standard tap wrench drives and tapping fixtures sized for large-diameter taps.

Installation Notes

Installation should be performed by qualified machinists or maintenance tradespeople familiar with thread cutting procedures. Ensure the workpiece is securely fixtured and the tap is started square to the hole to prevent thread misalignment or tap breakage. Apply appropriate cutting fluid for the workpiece material throughout the tapping operation. Always back the tap off periodically to break and clear chips, particularly in deep holes.