Weld Fittings
Our Products
Weld Fittings
Product Specifications & Features
Size Range: 1/8” to 2” in fractional series and 6 mm to 38 mm in metric series.
Material: 316 Stainless Steel is the standard material. Other materials are available upon request.
Manufacturing Process: Straight fittings are machined from high-quality bar stock, while forged fittings are produced from precision forgings for enhanced strength and durability.
Precision Machining: All ports are quality machined to ensure consistent welding and reliable performance.
Optimized Flow Design: Elbows are designed with radius junctions to provide a smooth flow path and minimize pressure drop.
Marking & Traceability: All fittings are permanently marked with size, material grade, and heat code for complete traceability.
Thread Protection: All threads are capped for protection and properly packaged to prevent damage during transit.
Thread Standards: All NPT pipe threads conform to the requirements of ASME/ANSI B1.20.1.
Working Pressure: Designed to meet ANSI/ASME B31.3 requirements at ambient temperature.
These features ensure high reliability, durability, and compliance with international piping standards for industrial applications.
MATERIAL
| Material | Bar Stock | Forging | Tubing | |
| Fractional | Metric | |||
| Grade SS 316 | ASTM A276, ASTM A479, ASME SA276, ASME SA479 |
ASTM A182 ASME SA182 |
ASTM A213 (Seamless). ASTM A249 (Welded). ASTM A269 (Seamless & Welded). |
EN ISO 1127 |
| Grade SS 316L | ASTM A276, ASTM A479, ASME SA276, ASME SA479 |
ASTM A182 ASME SA182 |
ASTM A213 (Seamless). ASTM A249 (Welded). ASTM A269 (Seamless & Welded). |
EN ISO 1127 |
Threads
| Threads | Specification |
| NPT Threads | ASME B1.20.1 |
| BSPT / ISO Tapered Threads | ISO 7-1, BS 21, JIS B0203, EN 10226-1, DIN 2999 |
| BSPT / ISO Parallel Threads | ISO 228-1, BS 2779, JIS B0202 |
Installation Instructions
To ensure a leak-proof and tight seal, it is recommended to use a suitable pipe thread sealant on all NPT threads. The most effective sealing method is the application of PTFE (Teflon) tape on male NPT tapered threads.
Before installation, thoroughly clean both male and female tapered threads to remove dirt, oil, or debris. Wrap the tape evenly in the direction of the male thread taper (clockwise when facing the threaded end), ensuring proper coverage without overlapping excessively. Trim off any excess tape to prevent contamination of the system.
Working Pressure
Catalogue pressure ratings are applicable for temperatures ranging from –20°F to 100°F (–28°C to 37°C). These ratings are based on an allowable stress value of 20,000 psi (1378 bar) in accordance with ASME B31.3 for 316 stainless steel.
To determine working pressures in accordance with ANSI/ASME B31.1, multiply the catalogue working pressure values by a factor of 0.94.
For elevated temperature applications, use the allowable working pressure at ambient temperature and multiply it by the appropriate elevated temperature factor to calculate the safe working pressure at higher operating temperatures.
WORKING TEMPERATURE
| Material | Minimum Working Temperature | Maximum Working Temperature |
| SS 316 | -325°F (-198°C) | 1000°F (538°C) |
| SS 316L | -325°F (-198°C) | 850°F (454°C) |
Welding Guidelines & Code Compliance
For proper weld setup, technique, and additional requirements in welded systems, always consult the applicable industry standards such as ASME Boiler and Pressure Vessel Code, ASME B31.1 (Power Piping), ASME B31.3 (Process Piping), or other relevant codes and regulations.
Material selection plays a critical role in achieving a sound weld. It is strongly recommended to use compatible or identical materials for fittings, pipes, and tubing. Matching materials ensure similar coefficients of thermal expansion, which helps minimize stresses during heating and cooling cycles. This reduces the risk of weld defects, distortion, out-of-roundness, and dimensional changes that could compromise weld integrity and overall system performance.
Weld Fittings
Weld Adapter NPTM x Weld
Weld Adapter NPTF x Weld
Reducing Weld Adapter(Union)
Weld Tee
Weld Elbow
Male Connector – Tube Socket Weld (Fractional) X Male Pipe Threads (NPT)
Male Connector – Tube Socket Weld (Metric) X Male Pipe Threads (NPT)
Female Connector – Tube SW (Fractional) X Female Pipe Threads (NPT)
Male Elbow – Tube SW (Fractional) X Male Pipe Threads (NPT)
Female Elbow – Tube SW (Fractional) X Female Pipe Threads (NPT)
Male Run Tee – Tube Socket Weld (Fractional) X Male Pipe Threads (NPT)
Female Connector – Tube SW (Metric) X Female Pipe Threads (NPT)
Male Branch Tee – Tube SW (Fractional) X Male Pipe Threads (NPT)
Union Elbow – Tube SW Socket Weld (Fractional) SW on both size
Union Elbow – Tube Socket Weld (Metric)
Union – Tube Socket Weld (Fractional)
Union – Tube Socket Weld (Metric)
Female Tee – Tube Socket Weld (Fractional)
Female Tee – Tube Socket Weld (Metric)
Union Cross – Tube Socket Weld (Fractional)
Union Cross – Tube Socket Weld (Metric)
Reducing Union – Tube Socket Weld (Fractional)
Reducing Union – Tube Socket Weld (Metric)
Reducing Union – SW (Fractional) X SW (Metric)
Union 45° Elbow – Tube Socket Weld (Fractional)
Union 45° Elbow – Tube Socket Weld (Metric)
Male Connector – Pipe Socket Weld X Male Pipe Threads (NPT)
Female Connector – Pipe Socket Weld X Female Pipe Threads (NPT)
Union – Pipe Socket Weld Both Size with Socket Weld Connection
Male Connector – Tube Butt Weld (Fractional) X Male Pipe Threads (NPT)
Male Connector – Tube Butt Weld (Metric) X Male Pipe Threads (NPT)
Female Connector – Tube BW (Fractional) X Female Pipe Threads (NPT)
Female Connector – Tube BW (Metric) X NPTF
Reducing Union – Tube Butt Weld (Fractional)
Reducing Union – Tube Butt Weld (Metric)
Union Elbow – Tube Butt Weld (Fractional)
Union Elbow – Tube Butt Weld (Metric)
Union Tee – Tube Butt Weld (Fractional)
Union Tee – Tube Butt Weld (Metric)
Union Cross – Tube Butt Weld (Fractional)
Union Cross – Tube Butt Weld (Metric)
Male Connector – Pipe Butt Weld X Male Pipe Threads (NPT)
Female Connector – Pipe Butt Weld X Male Pipe Threads (NPT)
Weld Adapter – Tube Socket Weld (Fractional) X Pipe Butt Weld
Adaptor – Tube Socket Weld SW (Fractional) X Pipe Butt Weld BW (Fractional)
Pipe to Tube Butt Weld – Female ISO Parallel / BSPP Pipe Threads X Tube Butt Weld (Metric)
Pipe To Tube Butt Weld – Female Metric Pipe Thread X Tube Butt Weld (Metric)