A threaded branch outlet forged to MSS SP-97, for instrument & small-bore taps.
About This Fitting
A Threadolet uses the same self-reinforcing, contoured base as a Weldolet, but the branch outlet is machined with NPT threads instead of a weld or socket end. It's commonly specified for instrument connections, gauge taps and other small branch lines where a threaded fitting is more practical than welding.
Grades & Standards
Available Copper-Nickel grades and the manufacturing standard applied to the threadolet.
Standards Explained
The full Copper-Nickel Olets range, forged to spec.
Technical Data
Nominal composition and typical mechanical properties for 90/10 & 70/30 Copper-Nickel forging stock, per ASTM B124.
Chemical Composition (% by weight)
| Grade | UNS No. | Cu | Ni (incl. Co) | Fe | Mn | Pb (max) |
|---|---|---|---|---|---|---|
| 90/10 Copper Nickel | C70600 | Remainder | 9.0 – 11.0 | 1.0 – 1.8 | 1.0 max | 0.05 |
| 70/30 Copper Nickel | C71500 | Remainder | 29.0 – 33.0 | 0.4 – 1.0 | 1.0 max | 0.05 |
Typical values per ASTM B124 forging stock, mechanical properties referenced to ASTM B466 Table 2. Mill test certificates issued per EN 10204 3.1 on request.
Mechanical Properties
| Property | Annealed | Half-Hard / Drawn |
|---|---|---|
| C70600 Tensile / Yield | 275 / 105 MPa | 310 / 205 MPa |
| C71500 Tensile / Yield | 372 / 140 MPa | 414 / 275 MPa |
| Elongation (both grades) | 30 – 35% | 18 – 20% |
| Density (both grades) | 8.94 g/cm³ | 8.94 g/cm³ |
Typical values; exact temper confirmed at enquiry stage.
Dimensions
MSS SP-97 covers essential dimensions, tolerances, marking, material & minimum strength requirements for 90°/45° integrally reinforced forged branch outlet fittings. Because a single outlet size fits a range of run pipe sizes, exact center-to-face dimensions are confirmed against your specific run/branch combination at enquiry.
| End Connection | Threaded (NPT) |
| Branch Size Range | NPS 1/8" – 4" |
| Reinforcement | Integral forged reinforcement at the branch-to-run interface |
| Branch Size Tolerance | ±0.03 in for branch sizes 1/8" – 3/4" (per MSS SP-97) |
| Governing Standard | Named type per MSS SP-97 Table 1; threads per ASME B1.20.1 (NPT). |
Each outlet size is manufactured to fit a range of run pipe sizes and curvatures, marked accordingly on the fitting body. Share your exact run pipe NPS/schedule and branch NPS for a size-specific dimensional drawing.
Send us your drawings, sizes and standards — our team will get back to you with a detailed quotation for your Copper-Nickel, Copper, Brass or Bronze piping requirement.
