Eagle Cutting Tool HT-448-T-I 4-48 Hss Hand Taper Tap

Product Description

The EAGLE CUTTING TOOL HT-448-T-I is a 4-48 high-speed steel (HSS) hand taper tap designed for cutting internal threads by hand in ferrous and non-ferrous materials. The taper tap features a gradual thread lead that distributes cutting force across multiple teeth, making it well suited for starting threads cleanly in through holes or blind holes where entry angle is a priority. At 0.31 pounds, it is a lightweight tool sized for precision thread work in small-fastener applications. Machinists, maintenance technicians, and tool and die professionals reach for this tap when the job calls for a controlled, hand-driven threading operation on 4-48 unified fine (UNF) thread forms.

This tap is used in light manufacturing, maintenance and repair operations (MRO), and machine shop environments where 4-48 UNF internal threads are required. The 4-48 designation indicates a No. 4 screw size with 48 threads per inch, a fine-pitch specification common in instrument work, electronics hardware, and precision mechanical assemblies. It is driven with a standard tap wrench and is appropriate for use in aluminum, brass, mild steel, and similar machinable materials.

Key Features

• 4-48 UNF thread form for fine-pitch internal threading in small-diameter holes
• High-speed steel (HSS) construction provides hardness and wear resistance across a range of workpiece materials
• Taper chamfer distributes cutting load gradually, reducing the risk of tap breakage on entry
• Hand-tap configuration designed for use with a standard tap wrench
• Lightweight at 0.31 pounds, easy to handle in bench or field service applications

Compatibility

Designed as an OEM-style replacement or standard hand tap for use in any application requiring 4-48 UNF internal threads cut by hand.

Installation Notes

This tap is installed by hand using a proper tap wrench sized for the tap shank. Secure the workpiece before tapping and ensure the tap is started square to the hole to prevent thread misalignment or breakage. Back the tap off a partial turn periodically to break chips, particularly in blind-hole applications. Follow standard shop safety practices and wear appropriate eye protection when tapping.

Technical Specifications

• Thread Size: 4-48 UNF
• Material: High-Speed Steel (HSS)
• Tap Style: Hand Taper
• Weight: 0.31 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-448-T-I