Irwin Hanson 1859ZR 18mm x 1.5 Bottom Tap High Carbon Steel Metric Thread

The Irwin Hanson 1859ZR is an 18mm x 1.5 pitch metric bottom tap designed for threading through-holes and reaching the bottom of blind holes. This high carbon steel tap is engineered for repair and maintenance work in automotive, machinery, and industrial applications where metric fasteners are standard.

Key Features:

• Bottom tap design allows threading to the bottom of blind holes with minimal thread run-out
• 18mm diameter with 1.5mm thread pitch for common metric fastener applications
• High carbon steel construction provides durability and wear resistance
• Ideal for auto repair and machinery where metric threads are specified
• Precision ground threads ensure accurate, clean metric thread cutting
• Best suited for maintenance and repair work on existing threaded holes

Bottom taps feature a chamfer of 1-2 threads, making them the appropriate choice when threads must extend as close as possible to the bottom of a blind hole or when tapping through holes. For best results when tapping blind holes, use in sequence after taper and plug taps.