Alloy 420F

Technical Data Sheet


Chemical Composition Limits
Weight% C Mn Si P S Cr Se Ni Mo/Zr
Alloy 420F
Type 1
0.30-0.40 1.25 1.00 0.060 0.030 12-14 0.18-0.35 0.10 0.60
Alloy 420F
Type 2
0.30-0.40 1.25 1.00 0.060 0.15-0.35 12-14 - 0.50 0.60

Alloy 420F is a free-machining hardenable steel that is generally used in parts that require high hardness and good corrosion resistance. Alloy 420F is easy to machine, grind and polish and is used in many different applications from pump shafts, screw machines, cams, pivots, gears etc. Alloy 420F is not recommended for vessels containing gases or liquids under high pressure. 420F is supplied in either cold finished or hot finished bar in the annealed condition (hardness 241HB max).

Grade 420F is available in Sheet, Bar (round), Wire, Billet, Rod. For all stock availability contact Sales.

AMS 5620 Bars (free machining)
ASTM A484 / ASME SA484
UNS S42020

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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