Bordo 1/4" x 20 TPI Left Hand UNC Tap Set

Bordo UNC taps cut Unified National Coarse threads on American-origin machinery and automotive components. The Left Hand UNC Tap Set Hand & Machine Tap - 3090 is part of Bordo's comprehensive Australian cutting tool range — trusted by engineers, tradespeople, and machinists across industry and manufacturing.

Where this product is used

UNC taps cut American Unified National Coarse threads — common on US-origin machinery, automotive components, and imported industrial equipment.

• American standard unified coarse thread cutting in automotive and industrial fastener repair
• Maintenance and repair on imported plant and machinery with UNC fasteners
• General engineering, aerospace, and automotive manufacturing with inch threads

Key specifications

Selecting the right option

UNC is the coarse thread version of the Unified inch system. Common sizes run from #4 through 1". HSS suits standard steels and aluminium; HSS-Co is required for stainless and high-tensile alloys. Match drill size to the tap using a published UNC tap drill chart.