Regal 0612M28CO 9/16-27 NS HSS H5 METFLO Bottom Tap
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This is a new Regal Cutting Tools 9/16-27 NS (National Special) METFLO spiral-point bottom tap, part number 0612M28CO, manufactured in the USA from High Speed Steel (HSS) with a black oxide finish. The H5 tolerance class indicates a pitch diameter tolerance limit of +0.0005" to +0.0010" above basic, suitable for producing 2B class fits in through and blind holes with minimal thread runout. METFLO designates Regal's spiral-point (gun-point) geometry, which pushes chips ahead of the tap into the hole — this tap is configured as a bottom (BTM) style, providing full threads to within a minimum distance of the bottom of a blind hole. The 9/16-27 NS thread form is a non-standard unified thread used in specific applications such as optical, plumbing fittings, and specialized assemblies requiring 27 TPI at 9/16" nominal diameter. Compatible with standard tap wrenches and CNC tapping chucks sized for the corresponding square drive shank.
Product Specifications
| Brand | Regal Cutting Tools |
| Part Number | 0612M28CO |
| Thread Size | 9/16 in |
| Threads Per Inch (TPI) | 27 |
| Thread Standard | NS (National Special) |
| Tap Style | Bottom (BTM) |
| Flute Type | METFLO Spiral Point (Gun Point) |
| Material | HSS (High Speed Steel) |
| Tolerance Class | H5 |
| Finish/Coating | Black Oxide |
| Country of Origin | USA |
| Condition | New |