321 Seamless or Welded Stainless Tube - AMS 5557

Technical Data Sheet

Chemical Composition Limits
Weight% C Mn Si P S Cr Ni Ti Mo Cu N
AMS 5557 0.08 max 2 max 0.40-1.00 0.040 max 0.030 max 17-20 8-13 0.7 max 0.75 max 0.75 max 0.10 max

Typical Mechanical Properties


Material Outside Diameter
Wall Thickness Tensile Strength ksi Yield Strength ksi Elongation %
AMS 5557 <0.188 <0.016 75-120 30 33
AMS 5557 <0.188 >0.016 75-105 30 35
AMS 5557 1.88-0.500 <0.010 75-115 30 35
AMS 5557 1.88-0.500 >0.010 75-105 30 35
AMS 5557 >0.500 >0.010 75-105 30 35

AMS 5557 Type 1 covers seamless, hydraulic tubing. AMS 5557 Type 2 covers welded hydraulic tubing. Contact Sales for further availability.

AMS 5510 Sheet / strip / plate
AMS 5557 Welded/seamless tube
AMS 5559 Welded / thin wall tube
AMS 5570 Seamless tube
AMS 5576 Welded tube
AMS 5645 Bars / wire / forging
MIL-T-8606 Seamless tube
MIL-T-8606 Welded tube
MIL-T-8808 Seamless tube
MIL-T-8808 Welded tube
ASTM A240 / ASME SA240
ASTM A167 / ASME SA167
ASTM A193 Grade B8T CL1
ASTM A276 / ASME SA276
ASTM A314 / ASME SA314
ASTM A320 Grade B8T
ASTM A479 / ASME A479
ASTM A484 / ASME SA484
AISI 321
BS 2S129
BS T67 Tube
BS S524 Sheet
BS S526 Sheet
BS 970; 321S31
WS 1.4541
UNS S32100
18.5Cr 10.5Ni 0.4Ti Hydraulic Solution Heat Treated
Alloy 30321


At Aircraft Materials all stock items can be shipped out within 24 hours, usually within the same day. Even cutting orders for bar or sheet can be processed and dispatched the same day, and for time-critical situations such as AOGs, we have a dedicated AOG service desk ready to help (

Thanks to our global logistics network we can source from anywhere in the world in just a few days. We use a range of transport partners to enable us to ship overnight within the U.K. and Europe and provide fast shipping solutions to the rest of the world. If your requirement is urgent we can offer a priority shipping service, but also if time is not so critical we can offer more cost-effective options to ensure you get the best value for money. To find out more about our services click here.

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

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