Stainless Steel 321 / 321H Tube Fittings


Arrow Piping Solutions is a renowned manufacturer, supplier, and exporter of SS 321 / 321H Compression Tube Fittings. These fittings are made using titanium-stabilized stainless steel, offering excellent corrosion resistance and high-temperature performance. SS 321 is ideal for applications where intergranular corrosion is a concern, especially after welding.


Our SS 321 / 321H Compression Tube Fittings are suitable for pneumatic and hydraulic applications in various industries, including aerospace, chemical processing, and automotive. These fittings exhibit great strength, toughness, and stability, even under extreme stress or cracking environments.

SS 321 Tube Fittings

SS 321 / 321H Compression Tube Fittings – Types & Forms


  • Stainless Steel 321 Bulkhead Union
  • SS 321 Female Elbow
  • 321H SS Flared Tube Fittings
  • Grade 321 & 321H Stainless Steel Male Connector
  • UNS S32100 Branch Tees
  • DIN 1.4878 Adapters
  • Stainless Steel 321 Instrumentation Tube Fittings Exporters
  • SS 321H Compression Tube Fittings Suppliers in India
  • SS 321 Parker Compression Tube Fittings
  • Stainless Steel 321H Compression Fittings Price
  • SS 321H Swagelok Compression Fitting
  • SS 321 Ferrule Tube Fittings
  • Stainless Steel 321 | 321H Twin Ferrule Fittings
  • SS 321H Hydraulic Tube Fittings

SS 321 / 321H Compression Tube Fittings Specifications

Size Range1/16 in. to 2 in. & 2mm to 50 mm
End Connection Thread TypeNPT (ASME B1.20.1), SAE AS71051, ISO/BSP Parallel (ISO 228), ISO/BSP Tapered (ISO 7), BS EN 10226-1, SAE (Unified) ASME B1.1
Dimensional Range1/16 to 2 inches (imperial); 2 to 50 mm (metric)
Working PressureUp to 2000 to 6000 PSI
TypesTube to Union, Tube to Male, Tube to Female, Instrument Pipe Fittings, Accessories

SS 321 / 321H Compression Tube Fittings Dimensions

ODOD ActualThread DesignationNPT (TPI)BSP (TPI)
5/160.31251/162728
13/320.4051/82728
35/640.5401/41819
43/640.6753/81819
27/320.8401/21414
1-3/641.0503/41414
1-5/161.315111.511
1-21/321.6601-1/411.511
1-29/321.9001-1/211.511
2-3/82.3752811
2-7/82.8752-1/2811
3-1/23.53811
44.03-1/2811
4-1/24.54811
5-5/85.5635811
6-5/86.6256811

SS 321 / 321H Compression Tube Fittings Chemical Composition

GradeCMnSiPSCrNNiTi
SS 3210.08 max2.0 max1.0 max0.045 max0.030 max17.00 - 19.000.10 max9.00 - 12.005(C+N) – 0.70 max
SS 321H0.04 – 0.102.0 max1.0 max0.045 max0.030 max17.00 - 19.000.10 max9.00 – 12.004(C+N) – 0.70 max

SS 321 / 321H Compression Tube Fittings Mechanical Properties

DensityMelting PointTensile StrengthYield Strength (0.2% Offset)Elongation
8.0 g/cm³1457 °C (2650 °F)75000 psi / 515 MPa30000 psi / 205 MPa35%

SS 321 / 321H Compression Tube Fittings Equivalent Grades

STANDARDWERKSTOFF NR.UNSJISEN
SS 3211.4541S32100SUS 321X6CrNiTi18-10
SS 321H1.4878S32109SUS 321HX12CrNiTi18-9

Arrow Piping Solutions delivers high-performance SS 321 / 321H Compression Tube Fittings that meet international standards. Our commitment to quality, precise machining, and customer satisfaction ensures products that are ideal for critical applications, backed by prompt service and global shipping.

Application Industries

Arrow Piping Solutions’ SS 321 / 321H Compression Tube Fittings are used in a variety of industries, including:

  • Textile Machinery
  • Oil and Gas Industry
  • Pulp and Paper Industry
  • Power Plants
  • Energy Industries
  • Furniture
  • Pharmaceutical Processing Industry
  • Modern Architecture
  • Home Appliances
  • Water Waste Projects
  • Synthetic Fiber
  • Heat Exchangers
  • Fluid Piping
  • Dairy and Food Processing