Bronze hex nipple, male-male NPT thread — class 125 (B122)
TECTUL · Dispatch across Colombia · Exports to Central & South America
Short nipple in brass bronze with male NPT thread on both ends and a central hex collar to seat the wrench without damaging the thread. It is used to directly join two female-threaded fittings (for example, two valves, or a tee and a gauge) without cutting and threading a pipe section. The TECTUL catalog covers it in 1/8″, 1/4″, 3/8″ and 1/2″, with manufacturer-verified length and weight in all four sizes.
IMPORTANT: reference data — may differ from the physical product; verify with an advisor before buying.
SKU VT-RAC-B122 (B122 hex nipple bronze) · 4 diameters 1/8″–1/2″ · sold by the unit
1. Technical specifications
Dimensions by diameter
| NPT size | Length A [mm] | Weight [g] |
|---|---|---|
| 1/8″ | 26.0 | 11 |
| 1/4″ | 31.0 | 22 |
| 3/8″ | 31.0 | 33 |
| 1/2″ | 38.0 | 52 |
IMPORTANT
This technical data sheet is a reference guide to the properties of this product type; it is not a quality certificate for the product you are buying. The measurements, dimensions and physical or geometric characteristics of the product supplied may vary by manufacturer, heat and lot, and may even fall outside the cited standards. If any of these figures is critical to your design or build, verify it with one of our advisors against the physical product or the lot's mill certificate, so you can be fully certain of what you are buying. · Original data sheet: tectul.com/en/conduccion-de-fluidos/racores-y-acoples/ficha-tecnica-b122-niple-hexagonal-bronce.html
Complete, verified table from the manufacturer sheet (March 2022 revision). The 1/4″ and 3/8″ sizes share the same overall length (31.0 mm) because both are short ("close") nipples whose length is set mainly by the hex collar, not the thread.
General specifications
| Product | Bronze hex nipple, male NPT thread on both ends, with a central hex collar |
| Material | Cast brass bronze |
| Thread | NPT per ANSI/ASME B1.20.1, both ends |
| Pressure rating | Class 125 (ASME B16.15): 200 psi (13.8 bar) ≤66 °C with water/oil/non-flammable gas · 125 psi saturated steam |
| Commercial range | 1/8″, 1/4″, 3/8″, 1/2″ NPT |
| Applicable standards | ASME B16.15 · ANSI/ASME B1.20.1 |
2. Frequently asked questions
Why do the 1/4″ and 3/8″ have the same length?
Because they are short ("close") nipples: their length is set mainly by the width of the central hex collar, not by each diameter's thread length, so two consecutive sizes can share the same overall length.
Where does the wrench seat to tighten it?
Only on the central hex collar. Never grip the thread with pliers: it deforms and loses the seal.
Can I use it to join two valves directly?
Yes, that is its typical function: joining two female-threaded fittings with no intermediate pipe run, always within its 200 psi (13.8 bar) cold rating.
3. Application notes
Feasibility
Suitable for joining two female NPT fittings in water, compressed air and low-pressure oil with no intermediate pipe run. Not suitable as a variable-length pipe run: it is a fixed-length part per size.
Installation
Seal both threads with PTFE tape or a fluid-compatible sealant. Always tighten by holding the central hex collar with an open-end wrench; do not use pliers on the thread or the smooth section.
Design
Rating valid cold (≤66 °C); for steam, 125 psi. Verify both fittings to be joined have a compatible female NPT thread in diameter and pitch before specifying.
4. Technical notice and limitation of liability
The pressures, dimensions, weights and other characteristics in this sheet are theoretical calculation values obtained from nominal properties published in the standards cited (ASME B36.10-2022, ASME B31.3-2024, ASTM A106/A106M-19a, ASTM A53/A53M-24, API Spec 5L 46th ed.). They guide selection; they are not a certificate of conformity for any given lot.
The actual behavior of each lot varies with manufacturing — wall tolerance (up to −12.5%), out-of-roundness, residual stresses — and with the raw material — chemical composition within the ranges the standard allows, heat-to-heat differences. To certify a lot, the tests defined by its product standard are required: tensile test, flattening test and hydrostatic test, documented in the manufacturer's mill test certificate (MTC), which TECTUL supplies upon request; testing of the lot in an independent laboratory can also be arranged.
These values must not be used as the sole criterion in critical or safety applications, or wherever failure of the line may compromise people, property or the environment: in such cases the design belongs to the project's responsible engineer under the applicable code (ASME B31.3, B31.1 or the one governing the installation), with the design temperature, corrosion allowance and load cases of the actual service. Before deciding with these data, consult our technical team.
Sources
- ASME B16.15-2020 — Cast Bronze Threaded Fittings: Classes 125 and 250
- ANSI/ASME B1.20.1-2013 (R2018) — Pipe Threads, General Purpose, Inch (rosca NPT)
- Ficha de fabricante "B122 - Niple Hexagonal" (catálogo de accesorios roscados de bronce, IMR/TECTUL, revisión marzo 2022): tabla completa de longitud A y peso para 1/8″–1/2″
This data sheet is the property of TECTUL, part of the Industrias IMR group. Reproduction without attribution is prohibited. Original document and updates: tectul.com/en/conduccion-de-fluidos/racores-y-acoples/ficha-tecnica-b122-niple-hexagonal-bronce.