Irwin 1/4"-20 NC HCS Fractional Bottom Tap - Bulk (1520)

The Irwin 1/4"-20 NC HCS Fractional Bottom Tap - Bulk (1520) is a high-carbon steel threading tool specifically designed for hand applications. It is an essential component for maintenance, repair, and rethreading tasks. This tap is constructed with a bottoming design, which allows it to create threads very close to the base of a blind hole. The four straight flutes are carefully ground to facilitate rapid chip removal, which is crucial for efficient and clean threading. This tap is ideal for use in various materials and consistently produces a Class 2B thread, making it a dependable choice for general-purpose use where a highly accurate thread is not required.

KEY FEATURES AND BENEFITS:

• Bottom Tap Design: The tap's bottoming chamfer, with only 1.5 threads, allows you to create threads close to the bottom of a blind hole. This is essential for applications where the maximum possible thread depth is needed.
• High Carbon Steel Construction: Made from High Carbon Steel (HCS), this tap provides good resilience and strength. This material choice ensures a good balance between hardness for cutting and toughness to resist breakage during hand use.
• Efficient Chip Removal: The four straight flutes are ground to provide rapid and effective chip evacuation. This helps prevent clogging and reduces the risk of the tap binding or breaking during the threading process.
• Versatile Hand Threading: Designed for hand threading in a variety of materials, this tap is a flexible tool for general repair and maintenance work. It is particularly suited for rethreading and for creating new threads where exact precision is not the primary concern.
• Class 2B Thread Production: The tap consistently creates a Class 2B thread, which is the industry standard for general-purpose fasteners. This ensures compatibility with most common bolts and screws of the same size.

SPECIFICATIONS:

• Part Number: 1520
• Thread Size: 1/4"-20 NC
• Threads Per Inch (TPI): 20
• Thread Standard: NC (National Coarse)
• Number of Flutes: 4
• Chamfer: Bottoming tap (1.5 threads)
• Recommended Drill Bit Diameter: 0.201 inches
• Material: High Carbon Steel (HCS)

HOW TO USE:

1. Preparation: Drill a hole to the recommended size (0.201 inches) for a 1/4"-20 NC thread. Ensure the hole is clean and free of debris. Secure the workpiece firmly to prevent it from moving.
2. Tool Setup: Insert the Irwin 1/4"-20 NC HCS Bottom Tap into a suitable tap wrench. Make sure the tap is held securely and is centered.
3. Initial Threading: Place the tip of the tap into the drilled hole, ensuring it is perpendicular to the workpiece surface. Apply light, even pressure and begin turning the tap wrench clockwise.
4. Cutting the Thread: Turn the tap wrench clockwise for about half a turn, then turn it counter-clockwise for a quarter turn. This back-and-forth motion helps break the chips and clear the flutes, preventing the tap from binding.
5. Completion: Continue this process, adding a cutting fluid if necessary for lubrication, until the tap has reached the desired depth in the hole. Once the thread is fully cut, carefully turn the tap counter-clockwise to remove it from the workpiece.

BENEFITS OF USING IRWIN 1/4"-20 NC HCS FRACTIONAL BOTTOM TAP - BULK (1520):

• Offers a dependable and efficient way to create or restore threads by hand.
• Bottoming design allows deeper thread creation in blind holes.
• Straight flutes provide continuous and clean chip evacuation.
• Constructed from durable high carbon steel for repeat use.
• Ideal for maintenance and repair without the need for high-precision equipment.
• Clear size marking aids quick identification and usage.

FEATURES:

• Suitable for manual threading jobs in various materials.
• Made from durable high-carbon steel for long-term reliability.
• Engineered with a short chamfer to reach the base of blind holes.
• Straight flute design ensures effective chip clearance.
• Delivers a consistent standard-fit Class 2B thread.
• Perfect for general-purpose rethreading and repairs.