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Our NPT Malleable Black Iron fittings are made with care and attention to detail. Reduced parting lines and smoother edges result in better fluid flow. By using a low
temperature galvanizing process the coating is more durable which means a longer
lasting fitting. All Fittings are 100% Pressure Tested to 300# Class.
- Material - ASTM A 197 - Cuppla Malleable Iron.
- Pressure - Saturated steam: 150 PSI @ 350°F & Max pressure 300 PSI @ 150°F
- Temperature range -20 - 350°F
°F | Class 150 PSIG |
Sizes 1/4" - 1" 300# |
Sizes 1-1/4" - 2" 300# |
Sizes 2-1/4" - 3" 300# |
---|---|---|---|---|
150 | 300 | 2000 | 1500 | 1000 |
200 | 265 | 1785 | 1350 | 910 |
150 | 225 | 1575 | 1200 | 825 |
150 | 185 | 1360 | 1050 | 735 |
200 | 150 | 1150 | 900 | 650 |
* Permissible for service temperature up to 366 °F, reflecting the temperature of saturated steam at 150psig. |
Questions & Answers

Popular Questions
10 months ago
10 months ago
JIC (Joint Industry Council) fittings can be identified by their 37-degree flare seating surface, which differentiates them from other types like the 45-degree flare fittings. Additionally, they are typically marked with the JIC designation or size, and the threads can be measured to match standard JIC thread sizes, which conform to SAE J514 specifications. See full answer »
9 months ago
9 months ago
Hydraulic fittings are components used to connect hoses, pipes, and tubes in a hydraulic system, ensuring a secure and leak-free flow of hydraulic fluid. They come in various types, such as threaded, crimped, and flanged, and are made from materials like steel, brass, or stainless steel to withstand high pressures and corrosive environments. Proper selection and installation of hydraulic fittings are crucial for maintaining system integrity and performance. See full answer »
8 months ago
8 months ago
To identify hydraulic fittings, examine the thread type, size, and sealing method, such as O-ring, metal-to-metal, or tapered threads. Additionally, use identification tools like thread gauges and calipers, and consult fitting charts or manufacturer specifications for accurate matching. See full answer »
5 months ago
5 months ago
Thread identification refers to the unique identifier assigned to each thread within a process by the operating system. This identifier, often called a thread ID or TID, allows the system and developers to manage, track, and reference individual threads separately, ensuring proper execution and resource allocation. See full answer »
5 months ago
5 months ago
To read a metric thread callout, you typically see a format like M8 x 1.25, where "M" indicates a metric thread, "8" represents the nominal diameter in millimeters, and "1.25" is the pitch, or the distance between threads, in millimeters. Additional information such as thread tolerance class may follow, for example, M8 x 1.25 - 6g, where "6g" indicates the tolerance grade. See full answer »
5 months ago
5 months ago
Yes, NPT (National Pipe Thread) threads have a tapered angle of 60 degrees, while BSP (British Standard Pipe) threads have a 55-degree angle and can be either parallel or tapered. You can identify them by measuring the thread angle with a gauge and checking the thread pitch and shape; NPT threads will have a slight taper, whereas BSP threads are often parallel (BSPP) or have a gentler taper (BSPT). See full answer »
5 months ago
5 months ago
To identify the type of thread, examine its physical characteristics such as pitch, diameter, and thread angle, and compare them to standardized thread profiles like ISO metric, UNC/UNF, or BSP. Additionally, using thread gauges or a thread identification tool can provide precise measurements to match the thread to known standards. See full answer »
5 months ago
5 months ago
In hydraulics, the most commonly used threads are National Pipe Tapered (NPT), British Standard Pipe (BSP), and metric threads. These threads ensure a secure, leak-proof connection in hydraulic systems, which is essential for maintaining system pressure and performance. The choice of thread type often depends on regional standards and specific application requirements. See full answer »
5 months ago
5 months ago
To identify unfamiliar threads, examine the thread's pitch, diameter, and thread count using tools like a thread gauge or caliper. Consulting a thread identification chart or using specialized software can also help match the thread to known standards. See full answer »
5 months ago
5 months ago
The thread identification kit includes 31 heat-treated aluminum thread gauges. This comprehensive set ensures you can identify a wide range of British Parallel and Metric Threads. See full answer »
