Click here - Printable Stainless Steel Strength Chart (PDF)Inch / Metric Ruler

Printable Chart for easy comparison between Stainless Steel Metric Bolt Classes and US grades equivalents.

Head Markings

Metric Bolt Class

Mechanical Properties

LBF/In² (PSI)

Min Yield (MPa)

Min Tensile Strength (MPa)

Class 100 Stainless Steel strength chart 

Class 100

Strongest stainless steel but uncommon.

145,030

800

1,000

A4-80 Stainless Steel Metric Strength Chart

Class 80 - High Strength Strongest commercially available stainless. Close to SAE Grade 5.

116,030

600

800

A2-70 Stainless Steel Strength Chart 

Class 70 - Cold Worked

Most common stainless steel fastener class.

101,530

450

700

 A2-50 Stainless Steel strength chart

Class 50 - Soft

Default as formed. Not worked to further increase strength.

72,520  210 500
 

US/Imperial  

LBF/In²(PSI)  

  Metric 

  Mpa(N/mm²)

Chart for easy comparison of US / Metric screws and bolts.  It is always a bit unusual to compare them as they use different measurement systems (PSI vs. Mpa). 

 180,000  

 SAE Grade 8- 150,000  

145,030  

SAE Grade 5 - 120,000  

  116,000  

101,530  

75,420  

SAE Grade 2 - 74,000  

72,520  

58,020  

  1,220 - Class 12.9

  1,040 - Class 10.9

  1,000 - Stainless 100

  830 - Class 8.8

  800 - Stainless 80

  700 - Stainless 70

  520 - Class 5.8

  510

  500 - Stainless 50

  400 - Class 4.6

 

Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set.

Yield Strength: The maximum load at which a material exhibits a specific permanent deformation

1MPa = 1N/mm2 = 145 pounds/Inch2

Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing. 

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