Thread & weld fittings
NPT threaded and socket-weld instrument fittings, in the full range of configurations below. Working pressure is governed by thread size, body style and material — five shared schedules below cover every threaded item by the family it actually belongs to; each card lists its own reference dimensions and connection type.
NPT threads per ASME B1.20.1. Forgings to ASTM A182/ASME SA182; bar stock to ASTM A479/ASME SA479. Pressure ratings per ASME B31.3 (4:1 design factor). Materials: 316 stainless steel, carbon steel and brass standard; Alloy 2507 (Super Duplex), Alloy 625, Alloy 825 and 6-Moly available on special order. Monel/Alloy 400 is not available in this fitting family. Reference dimensions shown per card are for the 1/4in size; other sizes available on request. Certain configurations are supplied ex-stock from a single qualified source rather than multiple — confirm exact size and material availability with our engineering team at RFQ stage.
| Size | 316SS / CS | Brass | 2507 / 625 | 6-Moly | 825 |
|---|---|---|---|---|---|
| 1/8″ | 6,500 | 3,200 | 12,500 | 8,800 | 7,500 |
| 1/4″ | 6,600 – 7,200 | 3,300 – 3,600 | 13,900 | 9,700 | 8,300 |
| 3/8″ | 5,300 – 5,600 | 2,600 – 2,800 | 10,800 | 7,500 | 6,500 |
| 1/2″ | 4,900 – 5,600 | 2,400 – 2,800 | 10,800 | 7,500 | 6,500 |
| 3/4″ | 4,600 – 5,100 | 2,300 – 2,500 | 9,800 | 6,900 | 5,900 |
| 1″ | 4,400 – 6,400 | 2,200 – 3,200 | 10,000 | 8,600 | 7,400 |
psig at 100°F. Lower figure = single-source rating; upper figure = second network source, where published. Exceptions: Street Elbow’s 1″ rating tops out at 5,300 psig (not 6,400). Run Tee is available at the lower figure only, with no special-alloy grades published. Branch Tee’s 3/4″/1″ sizes are single-source (lower figure), and its special-alloy grades stop at 1/2″.
| Size | 316SS / CS | Brass | 2507 / 625 | 6-Moly | 825 |
|---|---|---|---|---|---|
| 1/8″ | 6,500 | 3,200 | 12,500 | 8,800 | 7,500 |
| 1/4″ | 6,600 | 3,300 | 12,700 | 8,900 | 7,600 |
| 3/8″ | 5,300 | 2,600 | 10,200 | 7,100 | 6,100 |
| 1/2″ | 4,900 | 2,400 | 9,400 | 6,600 | 5,700 |
| 3/4″ | 4,600 | 2,300 | 8,900 | 6,200 | 5,300 |
| 1″ | 4,400 | 2,200 | 8,500 | 5,900 | 5,100 |
psig at 100°F. Hex Coupling and Adapter share this schedule — their special-alloy figures run lower than the Elbow/Tee/Cross family at every size, so the two tables must not be cross-referenced.
| Size | 316SS / CS | Brass | 2507 / 625 | 6-Moly | 825 |
|---|---|---|---|---|---|
| 1/8″ | 6,500 | 3,200 | 12,500 | 8,800 | 7,500 |
| 1/4″ | 7,200 | 3,600 | 13,900 | 9,700 | 8,300 |
| 3/8″ | 5,600 | 2,800 | 10,800 | 7,500 | 6,500 |
| 1/2″ | 5,600 | 2,800 | 10,800 | 7,500 | 6,500 |
| 3/4″ | 5,100 | 2,500 | 9,800 | 6,900 | 5,900 |
psig at 100°F. Single-qualified-source item; no 1″ size is published. Its base-metal rating differs from the Elbow/Tee/Cross family — do not substitute that table for Street Tee.
| Size | 316SS / CS | Brass | 2507 / 625 | 6-Moly | 825 |
|---|---|---|---|---|---|
| 1/8″ | 6,500 – 10,000 | 3,200 – 5,000 | 15,000 | 13,500 | 11,600 |
| 1/4″ | 6,600 – 8,000 | 3,300 – 4,000 | 15,000 | 10,800 | 9,300 |
| 3/8″ | 5,300 – 7,800 | 2,600 – 3,900 | 15,000 | 10,500 | 9,000 |
| 1/2″ | 4,900 – 7,700 | 2,400 – 3,800 | 14,800 | 10,400 | 8,900 |
| 3/4″ | 4,600 † | 2,300 † | — | — | — |
| 1″ | 4,400 † | 2,200 † | — | — | — |
psig at 100°F. † 3/4″/1″ ex-stock from a single qualified source; special-alloy grades are not published for Male Elbow/Male Tee beyond 1/2″. For an alloy-rated fitting above 1/2″ in this thread style, see the Nipple schedule.
| Size | 316SS / CS | Brass | 2507 / 625 | 6-Moly | 825 |
|---|---|---|---|---|---|
| 1/16″ ‡ | 11,000 | 5,500 | 15,000 | 14,900 | 12,800 |
| 1/8″ | 6,500 – 10,000 | 3,200 – 5,000 | 15,000 | 13,500 | 11,600 |
| 1/4″ | 6,600 – 8,000 | 3,300 – 4,000 | 15,000 | 10,800 | 9,300 |
| 3/8″ | 5,300 – 7,800 | 2,600 – 3,900 | 15,000 | 10,500 | 9,000 |
| 1/2″ | 4,900 – 7,700 | 2,400 – 3,800 | 14,800 | 10,400 | 8,900 |
| 3/4″ | 4,600 – 7,300 | 2,300 – 3,600 | 10,000 | 9,800 | 8,500 |
| 1″ | 4,400 – 5,300 | 2,200 – 2,600 | 10,000 | 7,100 | 6,100 |
psig at 100°F. ‡ 1/16″ is single-source (Hex Nipple only). This schedule applies to Close, Hex, Hex Long (cut-to-length) and Hex Reducing Nipple (per the larger thread size) — it rates higher than Male Elbow/Male Tee at every size above 1/2″; do not read this table across to that one.
90° turn joining two female NPT ports of equal size.
90° turn with one female and one male NPT port — no extra nipple needed.
At 1", rated to 5,300 psig max (316SS/CS) — see table footnote.
Street elbow stepping down to a smaller male NPT port.
3/4″×1/2″ and 1″×1/2″ ex-stock from a single qualified source.
90° turn joining two male NPT ports of equal size.
3/4″/1″ ex-stock from a single qualified source; special alloys not available beyond 1/2″.
Three equal female NPT ports, splitting or combining a line.
Tee with one male NPT run port and two female NPT ports.
Single-qualified-source item; its own rating schedule (higher at 1/4″ than the Elbow/Tee family) — do not use the Elbow/Tee/Cross table for this item. Sizes to 3/4in only.
Tee where the threaded male port sits in line with the run, not the branch.
Ex-stock from a single qualified source; no special-alloy grades published for this configuration.
Tee where the threaded male port sits on the side branch, not the run.
3/4″/1″ ex-stock from a single qualified source (lower figure); special alloys published to 1/2″ only.
Three equal male NPT ports.
3/4″/1″ ex-stock from a single qualified source; special alloys not available beyond 1/2″.
Four equal female NPT ports at a single junction.
Joins two female NPT ports of equal size in a straight line.
Couples two female NPT ports of different sizes.
Male NPT thread on one end, reduced female NPT on the other — steps a port down without a coupling.
| Combo | 316SS/CS | Brass |
|---|---|---|
| 1/4 → 1/8 | 6,500 | 3,200 |
| 3/8 → 1/8 | 6,500 – 9,200 | 3,200 – 4,600 |
| 3/8 → 1/4 | 6,600 | 3,300 |
| 1/2 → 1/8 | 6,500 – 12,200 | 3,200 – 6,100 |
| 1/2 → 1/4 | 6,600 – 8,300 | 3,300 – 4,100 |
| 1/2 → 3/8 | 5,300 | 2,600 |
| 3/4 → 1/4 | 6,600 – 10,000 | 3,300 – 5,000 |
| 3/4 → 3/8 | 5,300 – 8,200 | 2,600 – 4,100 |
| 3/4 → 1/2 | 4,900 | 2,400 |
| 1 → 1/4 | 6,600 – 10,000 | 3,300 – 5,000 |
| 1 → 1/2 | 4,900 – 8,600 | 2,400 – 4,300 |
| 1 → 3/4 | 4,600 – 5,300 | 2,300 – 2,600 |
Special-alloy figures for this item span 9,400–15,000 psig (2507/625), 6,600–15,000 psig (6-Moly) and 5,700–14,200 psig (Alloy 825) depending on combination — confirm the exact combination rating at RFQ.
Seals a female NPT port.
Rated by the mating fitting, not independently.
Seals a male NPT port.
Rated by the mating fitting, not independently.
Shortest standard nipple — two male NPT ends with no exposed shoulder.
Standard nipple with a central hex for wrench purchase.
Cut-to-length nipple for longer spacing between two threaded ports.
Nipple stepping between two different male NPT sizes.
Female to male NPT of the same size; ISO tapered and ISO parallel thread variants also available.
Female NPT stepping down to a smaller male NPT port.
Swivels through an angle to correct for minor pipe misalignment before final tightening.
| Size | 316SS/CS | Brass |
|---|---|---|
| 1/8″ | 6,500 – 8,400 | 3,200 – 4,200 |
| 1/4″ | 6,600 | 3,300 |
| 3/8″ | 5,300 | 2,600 |
| 1/2″ | 4,900 – 6,000 | 2,400 – 3,000 |
| 3/4″ | 4,600 | 2,300 |
| 1″ | 4,400 – 6,800 | 2,200 – 3,400 |
Special alloys span 5,300–15,000 psig (2507/625) across the size range — confirm the exact size rating at RFQ.
ISO parallel gauge thread to male NPT, for mounting pressure gauges directly.
| Size | 316SS/CS | Brass |
|---|---|---|
| 1/4″ | 5,700 | 2,850 |
| 3/8″ | 5,700 | 2,850 |
| 1/2″ | 3,900 | 1,950 |
Ex-stock from a single qualified source; sizes 1/4in–1/2in only. Special-alloy ratings equal the 316SS figure at each size.
Joins two tube ends by socket weld in a straight line.
Ex-stock from a single qualified source; no dual-network alloy pricing published for weld fittings.
90° turn, both ends socket weld.
Ex-stock from a single qualified source.
Three equal ports, all socket weld.
Ex-stock from a single qualified source. 1/8in size rated 11,800 psig.
Four equal ports, all socket weld.
Ex-stock from a single qualified source.
Socket weld on one end, male NPT on the other.
Ex-stock from a single qualified source.
Socket weld on one end, female NPT on the other.
Ex-stock from a single qualified source. Exact rating by size confirmed at RFQ.
90° turn, socket weld to male NPT.
Ex-stock from a single qualified source. Exact rating by size confirmed at RFQ.
90° turn, socket weld to female NPT.
Ex-stock from a single qualified source; limited size range.
Butt-weld pipe stub on one end, socket weld on the other — transitions pipe to tube.
Ex-stock from a single qualified source. Exact rating by pipe/tube combination confirmed at RFQ.
Plain weld stub on one end, socket weld on the other, both sized for tube.
Ex-stock from a single qualified source. Exact rating by size combination confirmed at RFQ.
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