Stainless Steel Threaded Fittings

Where Are Threaded Fittings Used?

Threaded fittings are essential connection components in piping systems. They are used to securely and permanently connect pipes with female or male threads – without the need for welding. Especially in industrial applications, they provide a simple and removable connection solution and are ideal wherever fast and flexible pipe connections are required.
Whether in installation technology, hydraulics, or mechanical and plant engineering, stainless steel threaded fittings offer clear advantages over other connection systems thanks to their versatility, durability, and corrosion resistance.

Certified Stainless Steel Threaded Fittings – Available from Stock

WITTE TUBE + PIPE SYSTEMS offers a comprehensive range of certified stainless steel threaded fittings, available directly from our central warehouse in Rastede. With more than 12,000 m² of storage space, we stock a wide variety of sockets, hex nipples, pipe nipples, and welding nipples in numerous dimensions, materials, and designs.

All products meet the highest quality standards and are designed for demanding industrial operating conditions. Upon request, our threaded fittings can be supplied with inspection certificates according to EN 10204, such as:

● 2.1 (Declaration of compliance with the order)
● 2.2 (Test report)
● 3.1 (Inspection certificate issued by the manufacturer)
● 3.2 (Third-party inspection, e.g., TÜV or Lloyd’s Register)

In addition, we can promptly arrange individual testing requirements, including non-destructive testing (NDT), PMI analysis, pressure testing, or special inspections according to customer specifications. This ensures that you receive exactly the quality level your application requires – whether for plant construction, the food industry, chemical processing, or offshore applications.

Thread Types – Internationally Standardized and Versatile

Our stainless steel threaded fi ttings are available with a variety of metric and imperial thread types and comply with both DIN/EN and international standards.
Available thread types include:

● R – tapered external thread according to ISO 7-1 (also known as BSPT)
● Rp – parallel internal thread according to ISO 7-1
● G – parallel pipe thread according to ISO 228-1 (BSPP)
● NPT – tapered American National Pipe Thread according to ANSI/ASME B1.20.1
● BSP/R – British Standard Pipe with tapered external thread
● BSPT/Rp – combination of tapered and parallel threads, e.g., for transition fi ttings
● BSPP (G thread) – British Standard Pipe Parallel thread

This wide range ensures seamless integration of our threaded fittings into both national and international piping systems.

Certifications for Nipples, Welding Nipples and Sockets

Our products comply with international standards and are regularly inspected by independent certification bodies. Depending on the product type, the following certifications are available:
For Nipples, Welding Nipples and Pipe Nipples:

● DIN 2982
● VdTÜV 418
● VdTÜV 421
● VdTÜV 1252
● AD 2000 W2 / W10
For Sockets:
● DIN 2986
● VdTÜV 418
● VdTÜV 421
● VdTÜV 1252
● AD 2000 W2 / W10

Our Range: Threaded Fittings in High Quality Stainless Steel Grades

Whether standard or special stainless steels, we stock sockets, hex nipples, and welding nipples in a wide range of materials. Our inventory includes common austenitic grades as
well as heat-resistant and highly corrosion-resistant special alloys for demanding applications.
Selected Available Materials:

● 1.4841 / AISI 314
● 1.4404 / 316L
● 1.4571 / 316Ti
● 1.4462 / Duplex
● 1.4539 / 904L
● 1.4547 / 254SMO

Special stainless steel
Standard stainless steel

Threaded fittings made of different materials

Whether austenitic chromium-nickel steel with titanium stabilisation 1.4541 or austenitic chromium-nickel-molybdenum steel 1.4404, whether 254SMO, duplex steel or super duplex steel: We supply you with a wide selection of stainless steels, steels (alloyed and unalloyed) as well as nickel-based alloys.
We can also produce threaded fittings at short notice according to customer specifications.

Certifications for nipples, welding nipples, pipe double nipples