NPT Threaded Reducing Coupling — Class 150, 3000 & 6000
Concentric female-to-female NPT reducing coupling for transitioning inline between two different male NPT pipe sizes. Offered across Class 150, Class 3000, and Class 6000 series in 304/304L and 316/316L stainless steel (1/4" × 1/8" to 6" × 4").
Material options | 304 / 304L / 316 / 316L |
|---|---|
Connection | Large Female NPT × Small Female NPT (Concentric Reducing Coupling) |
Pressure class | Class 150 / 3000 / 6000 |
Nominal size range | 1/4" × 1/8" to 6" × 4" (series range) |
Construction | Cast (Class 150) / Forged ASME B16.11 (Class 3000 & 6000) |
Size
Product overview
Construction, Pressure Class & Material Grades
Designed with Large Female NPT × Small Female NPT (Concentric Reducing Coupling) geometry (Cast (Class 150) / Forged ASME B16.11 (Class 3000 & 6000)), this threaded stainless steel fitting joins mating tapered NPT pipe threads along metal-to-metal thread flanks. Manufactured as a 150 lb investment-cast stainless steel fitting series in 304 / 304L / 316 / 316L stainless steel.
Series Size Coverage & Thread Make-Up
Nominal pipe thread sizes span 1/4" × 1/8" to 6" × 4" (series range) across the series; available size options and envelope dimensions vary by stainless steel grade. Verify mating NPT thread specifications and consult the dimensional table for the selected size row before ordering.
Technical specifications
Dimensional Reference · Class 150 · 304 Stainless Steel (1/4" x 1/8"–3" x 2-1/2")
Class 150 · 304 stainless steel · 1/4" × 1/8" to 3" × 2-1/2"
Units: inches
| Specification reference | Nominal Size | Length (M) |
|---|---|---|
| CH-F059-001 | 1/4" x 1/8" | 0.98" |
| CH-F059-002 | 3/8" x 1/8" | 1.1" |
| CH-F059-003 | 3/8" x 1/4" | 1.1" |
| CH-F059-004 | 1/2" x 1/4" | 1.34" |
| CH-F059-005 | 1/2" x 3/8" | 1.34" |
| CH-F059-006 | 3/4" x 1/4" | 1.5" |
| CH-F059-007 | 3/4" x 3/8" | 1.5" |
| CH-F059-008 | 3/4" x 1/2" | 1.5" |
| CH-F059-009 | 1" x 1/2" | 1.65" |
| CH-F059-010 | 1" x 3/4" | 1.65" |
| CH-F059-011 | 1-1/4" x 3/4" | 1.89" |
| CH-F059-012 | 1-1/4" x 1" | 1.89" |
| CH-F059-013 | 1-1/2" x 1/2" | 2.05" |
| CH-F059-014 | 1-1/2" x 3/4" | 2.05" |
| CH-F059-015 | 1-1/2" x 1" | 2.05" |
| CH-F059-016 | 1-1/2" x 1-1/4" | 2.05" |
| CH-F059-017 | 2" x 1/2" | 2.28" |
| CH-F059-018 | 2" x 3/4" | 2.28" |
| CH-F059-019 | 2" x 1" | 2.28" |
| CH-F059-020 | 2" x 1-1/4" | 2.28" |
| CH-F059-021 | 2" x 1-1/2" | 2.28" |
| CH-F059-022 | 2-1/2" x 2" | 2.56" |
| CH-F059-023 | 3" x 1-1/2" | 2.83" |
| CH-F059-024 | 3" x 2" | 2.83" |
| CH-F059-025 | 3" x 2-1/2" | 2.83" |
Need a different size, connection or document?
Discuss your requirements
