Alloy 20 Bolts, Nuts, and Fasteners are a great fit for sulfuric acid applications…

Alloy 20 flat washers, nuts, bolts, screws, alloy-20 fasteners, socket head cap screws stock at Lightning Bolt

Alloy 20 flat washers

Boltology: Alloy 20 Bolts, Nuts, and fasteners

Considered a “super” alloy of stainless steel, Carpenter 20 (also known as Alloy-20) is practically immune to chloride pitting… which is what makes it so popular within the chemical, food, plastic, and pharmaceutical industries.  This alloy offer great resistance to stress-corrosion cracking in mid concentration sulfuric acid.  This can be seen in within the food and dye industry alloy-20 bolts and alloy 20 nuts which are used in SO2 scrubbers.  Its corrosion resistance to acid attack is due to its unique composition of chromium, nickel, molybdenum and copper.  It is also used in other industries such as pharmaceuticals, refineries and many other manufacturing facilities, despite being designed for acidic conditions.

With a tensile strength of 80ksi, Alloy 20 bolting offers the strength for most applications while also highly resistant to corrosion in acidic applications.  For additional information on the properties of Alloy 20 bolts and other fasteners, contact Lightning Bolt at 225-272-6200 or

As an ISO 9001:2015 certified manufacturer, Lightning Bolt Stocks an immense supply of Alloy 20 bolts.  Call us any time when your project calls for alloy 20 bolts, nuts, washers, or any specialty fasteners.

Our capabilities of manufacturing include threading, bending, forging, stamping, and even coating.  Traditionally, Xylan coated fasteners are not applied to alloy 20, but it is complete possible to do so.

Mechanical Properties of Alloy 20

Minimum Specified Properties, ASME Sb-688 Plate

Ultimate tensile strength, ksi80
0.2% yield strength, ksi35
Elongation, %30
Hardness MAX, Brinell217

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