STAINLESS STEEL BOLT GRADES CHART

Stainless steel bolt grades chart according to ISO 3506-1 standard.

Stainless Steel Bolt Grades Chart
Grade Grade Property
class		 Thread
diameter
range		 Tensile
strengthNote
(MPa)		 Stress at 0.2%
permanent
 strain Note 
(MPa)
Austenitic A1, A2, A3,A4,A5 50 ≤ M39 500 210
70 ≤ M24 700 450
80 ≤ M24 800 600
Martensitic C1 50 - 500 250
70 - 700 410
110 - 1100 820
C3 80 - 800 640
C4 50 - 500 250
70 - 700 410
Ferritic F1 45 - 450 250
60 - 600 410
 

Note 1: Tensile stress is calculated on the stress area As,nom = π/4 * ((d2+d3)/2)^2 where d2 is basic pitch diameter and d3 is nominal minor diameter.

Supplements:

Reference:

  • ASME B1.1-2003, Unified Inch Screw Threads (UN and UNR Thread Form)
  • Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) . Machinery's Handbook . 30th edition.  Industrial Press Inc.
  • Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2012) . Machinery's Handbook . 29th edition.  Industrial Press Inc.