Head Markings

Grade or Class

Material

Nominal Size Range
(Inches)

Mechanical Properties

Proof Load (psi)

Minimum Yield Strength (psi)

Minimum Tensile Strength (psi)

METRIC A2 Stainless Steel

A-2 Stainless

Steel alloy with 17-19% Chromium and 8-13% Nickel

1/4 thru 5/8

40,000 Min. 80,000 – 90,000 Typical

100,000 – 125,000 Typical

3/4 thru 1

40,000 Min. 45,000 – 70,000 Typical

100,000 Typical

Above 1

80,000 – 90,000 Typical

Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing.
Yield Strength: The maximum load at which a material exhibits a specific permanent deformation
Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set.