A105 elbows, tees, couplings and closures quoted to specification
A105 forged-steel NPT fittings cover elbows, tees, couplings, reducers and closures specified for threaded pipework. This is a specification-based sourcing service: we quote the requested pattern, end sizes and class as a complete item. The table below is a Class 3000 dimensional reference.
| Change direction | Female elbows join two male pipe ends; street elbows provide one male and one female end. |
|---|---|
| Add a branch | Equal tees keep the same opening size; reducing tees use separate run and branch sizes. |
| Join straight pipe | Full couplings join two male ends. Half couplings serve the separate connection detail specified for their shorter body. |
| Reduce a connection | Reducing couplings have two female ends; bushings use a male outer thread and a smaller female inner thread. |
| Close an opening | Caps close male pipe ends; plugs close female ports. |
| Material and thread | A105 forged carbon steel with NPT threads to ASME B1.20.1, quoted in the requested fitting pattern and class. |
Find the NPT size, thread pitch and fitting length.
| NPT size (in.) | Threads per inch | 90° elbow / equal tee center-to-end (in.) | Center-to-end (mm) | Full coupling overall length (in.) |
|---|---|---|---|---|
| 1/4 | 18 | 7/8 | 22.2 | 1 3/8 |
| 3/8 | 18 | 31/32 | 24.6 | 1 1/2 |
| 1/2 | 14 | 1 1/8 | 28.6 | 1 7/8 |
| 3/4 | 14 | 1 5/16 | 33.3 | 2 |
| 1 | 11.5 | 1 1/2 | 38.1 | 2 3/8 |
| 1-1/4 | 11.5 | 1 3/4 | 44.5 | 2 5/8 |
| 1-1/2 | 11.5 | 2 | 50.8 | 3 1/8 |
| 2 | 11.5 | 2 3/8 | 60.3 | 3 3/8 |
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Center-to-end measures from the intersecting pipe centerlines to the fitting end. Coupling length measures the complete body. Millimeter values convert the inch center-to-end dimensions using 25.4 mm per inch.
The 1 in. Class 3000 elbow and equal tee have a 1 1/2 in. center-to-end dimension. A 1 in. full coupling is 2 3/8 in. long. Thread engagement determines how far the mating pipe enters each opening, so the component dimension and installed run length are different measurements.
| Nominal size (in.) | NPT threads per inch | BSPT / ISO 7/1 threads per inch |
|---|---|---|
| 1/4 | 18 | 19 |
| 1/2 | 14 | 14 |
| 3/4 | 14 | 14 |
| 1 | 11.5 | 11 |
| 2 | 11.5 | 11 |
The tapered male and female threads engage along their flanks. Thread sealant and assembly requirements follow the connection and service specification. A pipe thread is selected by its nominal designation, rather than by treating a caliper bore measurement as the size.
An elbow or tee needs room to turn during assembly. Where both pipe ends are already fixed, a union or a revised assembly sequence provides the separation point. The fitting pattern and available wrench clearance belong in that layout decision.
NPTF has different crest and root controls for dryseal connections. An NPT description is not an NPTF specification; the required thread designation stays explicit on the purchase line.
A regular threaded elbow has two female ports. A street elbow has one male and one female port, which changes the connection at one end. The 45° or 90° angle and both end types identify the part.
An equal tee uses the same size at all three openings. Reducing tees identify the run and branch separately. When all three ports differ, the opening sequence is run × run × branch; it is retained in the fitting description.
A full coupling joins two male-threaded ends through a straight body. A half coupling has one threaded socket and a shorter body. Those patterns serve different assembly details and are counted as separate items.
A reducing coupling has female connections of two sizes. A reducing bushing has an external male thread and a smaller internal female thread. Both reduce size, but their end configurations fit different mating parts.
A female-threaded cap closes a male pipe end. A male-threaded plug closes a female port. The wrench form and connection size identify the correct closure for the opening.
A threaded cross has four ports arranged as two intersecting straight axes. It serves a layout with two opposing branches; a three-port tee leaves one of those directions closed. The opening count remains explicit on the fitting list.
ASTM A105 specifies the forged carbon-steel material. Fitting dimensions and class come from the applicable fitting specification; the NPT thread has its own dimensional standard.
ASME B16.11 covers forged threaded and socket-weld fitting dimensions, tolerances, ratings and marking. Its threaded class series is 2000, 3000 and 6000. Socket-weld Class 9000 belongs to a different connection series.
NPT dimensions and gauge checks follow ASME B1.20.1, alongside the fitting’s specified material and class.
Checks cover the specified thread form, taper and gauge engagement. Damaged starts, burrs or incomplete threads are addressed before the fitting is packed.
The fitting angle, center-to-end dimension and overall body length are checked against the selected pattern. Reducing fittings retain the size of each port in the inspection item.
The flow passage and opening edges are checked for obstructions and machining burrs. Clean threaded mouths let the matching part start without forcing the first thread.
Checks reconcile the material, nominal size and class with the item marking and package label.
Mixed orders are packed and counted by fitting pattern and size. Reducing parts show each port size; male/female ends distinguish street elbows from female elbows.
Packing separates fitting sizes and protects the threaded mouths from impacts and loose debris. Carton or wooden-package identification shows the item description and piece count for receiving.
No. A fitting class is a rating designation. Allowable pressure depends on the material, temperature and applicable piping design requirements. The class on the fitting line must match the approved project specification.
No. Malleable-iron threaded fittings use a different material and the ASME B16.3 class series. The Class 3000 dimensions shown here belong to forged steel fittings; a matching NPT size alone does not make the two products equivalent.
List unions separately by material, size, class and seat design. A forged union specified to MSS SP-83 is a separate item from a B16.11 coupling or elbow and is identified separately in the quotation.
Yes. Threaded pipe lengths can be quoted with the fitting pieces. The pipe material, wall designation and length remain on their own lines, with the mating NPT connections identified for the assembly.
Send the fitting patterns, material, class, NPT sizes and piece counts you know, along with the delivery destination. An available material takeoff or assembly drawing helps us check the connections and prepare a specification-based quotation.