Irwin Hanson Fractional Hand Tap — 4-Flute Class 2B
The Irwin Hanson Fractional Hand Tap is built for professionals who need reliable threading in routine maintenance, repair, and rethreading applications. Four straight flutes are precision-ground for rapid chip removal, keeping cuts clean and efficient across a wide variety of materials. Produces a Class 2B thread — the standard tolerance for most general-purpose fastener applications where high precision is not critical.
Key Features
- 4 straight flutes ground for rapid chip removal and efficient threading
- Produces Class 2B thread — ideal for general maintenance and repair
- Straight shank for use with standard tap handles and wrenches
- 3 to 5 threads chamfered for easy starting
- Textured ambidextrous grip for ergonomic, sure-handed control
- Designed for hand threading in a variety of materials
- Ideal for routine maintenance, repair work, and rethreading
Specifications
| Spec | Value |
|---|---|
| Thread Class | 2B |
| Flutes | 4 (straight) |
| Chamfer | 3–5 threads |
| Shank Type | Straight |
| Available Size | 5/16-18 |
| Vendor | Irwin Hanson |
| SKU | OHL-95105 |
| Barcode | 042526081279 |
Frequently Asked Questions
What is a Class 2B thread?
Class 2B is the most common thread tolerance class for general-purpose fasteners. It provides a moderate fit — not too loose, not too tight — making it the standard for routine maintenance, repair, and rethreading work where high precision is not required.
What materials can this tap be used on?
The Irwin Hanson Fractional Hand Tap is designed for hand threading in a variety of materials including mild steel, aluminum, brass, and plastics — making it a versatile choice for maintenance and repair shops.
What does "4 straight flutes" mean?
Straight flutes run parallel to the tap's axis and are ground to efficiently cut threads while channeling chips away from the cutting zone. Four flutes provide a good balance of chip clearance and thread-cutting strength for hand tapping applications.
What is the chamfer on this tap?
This tap has a 3 to 5 thread chamfer, which means the first few threads are tapered to help guide the tap into the hole and start the thread easily without binding.
Is this tap suitable for arborist or utility field use?
Yes — this tap is well-suited for field repair and maintenance work, including rethreading damaged bolt holes on climbing hardware, pole equipment, and utility fixtures where a standard Class 2B fit is acceptable.
What size is available?
This listing is for the 5/16-18 size (5/16" diameter, 18 threads per inch — a common UNC fractional thread size used in general hardware and utility applications).