GF Gage G7011721 1/8-27 NPTF L3 Tapered Pipe Thread Plug Gage

This is a new Greenfield (GF) Gage GFII-series 1/8-27 NPTF L3 tapered pipe thread plug gage, manufacturer part number G7011721 / 55338214, used to verify the functional thread form of 1/8-27 NPTF (Dryseal National Pipe Taper Fuel) female threaded ports to ASME B1.20.3 standard. The L3 (Product Check) gage checks the full thread engagement length of the taper — including crest and root truncations — confirming that both the pitch diameter taper and thread form are within tolerance for a pressure-tight, sealant-free dryseal connection; this is a more rigorous check than the basic L1 functional gage. The GFII handle design incorporates a slip-fit plug head with a bayonet-style locking sleeve (visible in the photos) that allows the plug element to be replaced without replacing the handle, reducing long-term tooling cost. The plug element is hardened tool steel with a ground and lapped tapered thread form; the green anodized aluminum handle is engraved "1/8-27 NPTF-L3" and "GF GAGE" for positive identification. Calibration expiration date of 6/4/2026 is indicated on the factory label, confirming this unit is new and in-calibration.

Product Specifications