All stainless steel pipe fittings are monitored by quality control personnel for strict compliance with applicable standards & specifications. These stainless steel pipe fittings are excellent for uses that involve chemicals or liquids that may be corrosive. Along with fighting corrosion, a stainless steel pipe fitting will prevent contamination making it useful to many professionals. Use with air, water, oil, natural gas, steam NPT and FNPT threads conform to ASME B1.20.1 Maximum Pressure: 300 psi @ 72 F;150 psi @ 366 F for steam Maximum Steam Pressure: 150 psi Stainless castings conform to ASTM A351 ACI Grade CF8 (304) & ACI Grade CF8M (316) Manufacturing facility is ISO 9001:2008 Dimensions: Dimensions are for reference only and subject to change. Contact us if you require fittings with specific dimensions.FEATURES Tight Radius 90° Bend Angle 321 Stainless Steel Allows for a Smooth, Unobstructed Flow of Exhaust Gas Durable Enough for a Wide Variety of Turbo Manifold Applications Capable of Withstanding 1,600°F 37.5° Beveled Ends Manufactured to ASTM A403/ASME B16.9 specifications 304 Stainless vs 321 StainlessOne major chemical difference between 304 and 321 Stainless is the addition of Titanium (Ti) in 321 stainless to help "stabilize" the alloy and to reduce the risk of corrosion in the heat-affected zone. When 304 Stainless is heated above 1,292°F for an extended period of time it may suffer from weld decay. Weld decay is reduced by the addition of titanium, making 321 Stainless ideal for use in turbo exhaust manifolds and other exhaust products that see high levels of heat over prolonged periods of time. Although 304 Stainless is more than suitable for most turbo manifold and other exhaust applications, 321 Stainless is the superior choice for heat-related corrosion resistance.