OSG 3312508 1"-11.5 NPTF TiCN HSS 5-Flute Pipe Tap
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The OSG 3312508 is a new 1"-11.5 NPTF (National Pipe Taper Fuel) internal thread pipe tap manufactured from high-speed steel (HSS) and TiCN (Titanium Carbonitride) coated, as confirmed by the product label reading "1"-11-1/2 NPTF INT. THRD PIPE TAP TiCN" and the shank stamping "OSG 1-11.1/2NPTF HSS 826467." NPTF is a dryseal pipe thread form (ANSI/ASME B1.20.3) that produces pressure-tight joints without sealants by controlled thread interference, distinguishing it from standard NPT. The tap features 5 flutes for efficient chip evacuation in interrupted cuts and a square shank drive end, with TiCN coating delivering higher surface hardness (~3000 HV) and lower friction compared to standard TiN, extending tool life in steels, cast iron, and stainless steel. The 1" nominal pipe size corresponds to a 1.3125" (1-5/16") major thread diameter with 11.5 threads per inch taper; OSG catalog number 826467 is the underlying product code visible on the shank, with 3312508 being the SKU/item number on the retail label. Made in Brazil per the product label.
Product Specifications
| Brand | OSG |
| Item Number (SKU) | 3312508 |
| Catalog Number | 826467 |
| Thread Size | 1 in - 11.5 TPI |
| Thread Standard | NPTF (Dryseal) |
| Thread Type | Internal (Female) |
| Taper | 1/16 in/in (NPT/NPTF standard) |
| Major Diameter (Nominal Pipe) | 1 in nominal pipe size |
| Major Thread Diameter | 1.3125 in (1-5/16 in) |
| Threads Per Inch | 11.5 TPI |
| Number of Flutes | 5 |
| Material | High-Speed Steel (HSS) |
| Coating | TiCN (Titanium Carbonitride) |
| Shank Type | Square drive |
| Country of Origin | Brazil |
| Applicable Standard | ANSI/ASME B1.20.3 |
| Condition | New |