Technical Tips
How to choose the right fastener metal?
To maximize fastener service life, fastener material must be matched to the application. Flexco manufactures fasteners from a broad range of materials. Our selection makes it easy to specify fasteners that will deliver maximum performance in a variety of conditions - from wet and abrasive applications to highly corrosive environments. The following information will help you match fasteners to available fastener materials.
Steel: For most applications, plated steel is the standard fastener material. Plating helps combat mild corrosion.
Note: The steel used for Flexco® Bolt Solid Plate fasteners is not plated.
RustAlloy® : To resist corrosion due to mine water exposure or other chemical attack, RustAlloy is an excellent choice. It is a low-chrome stainless steel alloy available in the SRTM Hinged Rivet system.
Promal: Fasteners made from Promal are heat-treated, malleable castings. Top plates are manufactured from cast Promal and deliver abrasion resistance in corrosive environments such as coke and sinter operations. Bottom plates are manufactured from steel. Available in select sizes in some fastener families.
Everdur: Copper and silicon alloy for use in grain elevators and other potentially explosive environments. Spark-free material compared to steel but fully non-magnetic. Also for belts with magnetic pulleys or separators.
MegAlloy® : Features superior resistance to wear and abrasion. Provides several times the service life of steel. Not recommended where impact or corrosion is a problem. Available in select sizes in some fastener families.
Stainless Steel: 300 Series stainless steel, available in selected sizes, provides extra resistance to abrasion, magnetic attraction, and corrosion from acids and other chemicals.
CHARACTERISTICS
| Fastener Material: |
 |
 |
 |
 |
 |
| Galvanized Steel |
Good |
Poor |
Fair |
Yes |
No |
| 400 Series Stainless Steel |
Good |
Fair to Good |
Yes |
No |
No |
| 300 Series Stainless Steel |
Good |
Good to Excellent |
No |
No |
No |
| MegAlloy® |
Excellent |
Poor |
Poor |
Yes |
No |
| RustAlloy® |
Good |
Good |
Good |
Yes |
No |
| Everdur |
Poor |
Poor |
Poor |
No |
Yes |
| Promal |
Excellent |
Good |
Good |
Yes |
No |
| Rubber-Coated Steel |
Good to Poor |
Poor |
Yes |
No |
No |
| High Tensile Steel |
Good to Fair |
Good |
Yes |
No |
No |
| Rectangular High Tensile Steel |
Excellent |
Fair |
Good |
Yes |
No |
| Monel® 400 |
Fair |
Excellent |
Excellent |
Slightly |
No |
| Inconel® 600 |
Fair |
Excellent |
Excellent |
No |
No |
| Phosphor Bronze |
Good |
Poor |
Good |
No |
Yes |
| Hastelloy C-22 |
Good |
Excellent |
Excellent |
No |
No |
| Black Oxide |
Good |
Poor |
Fair |
Yes |
No |
| Non-Metallic |
Poor |
Fair |
N/A |
No |
Yes |
| Note: Please use as a quick-reference chart only. |
|
AVAILABILITY
| Fastener Material: |
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| Galvanized Steel |
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| 400 Series Stainless Steel |
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| 300 Series Stainless Steel |
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| MegAlloy® |
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| RustAlloy® |
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| Everdur |
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| Promal |
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| Rubber-Coated Steel |
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| High Tensile Steel |
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| Rectangular High Tensile Steel |
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| Monel® 400 |
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| Inconel® 600 |
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| Phosphor Bronze |
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| Hastelloy C-22 |
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| Black Oxide |
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| Non-Metallic |
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| Note: Please use as a quick-reference chart only. |
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