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Sterling Armor®


In the end, "all things being equal"
...may not be a valid statement.


FRANTZ Manufacturing proudly introduces Sterling Armor® — the alternative to stainless steel.

In a direct response to customer requests, FRANTZ engineers have developed a low carbon steel ball that has the best attributes of stainless steel.

With surface hardness near 70Rc, Sterling Armor® is not a plating. Using FRANTZ' patented* manufacturing process, and control of time, temperature and gaseous composition, a ball surface is created that has higher scuff and wear resistance than 300 stainless.



Tested for over 1200 hours in salt fog, Sterling Armor® just keeps on rolling — which makes Sterling Armor® ideal in caustic environments.

With a wide variety of sizes available, Sterling Armor® has almost endless applications. Corrosion resistance, magnetic, "no pit" or even aesthetic (Sterling Armor® results in a pleasing gloss black finish), Sterling Armor® is the solution.

Best of all, Sterling Armor® offers a price advantage over stainless steel balls — we dare say a significant advantage. Call us for a quote on your application. We think you'll be delighted.



Corrosion Resistance Properties (Typical)

Ball
Material
Hydraulic Oils
(Petroleum)
Fresh
Water
Salt
Water
AlcoholHCL-40%Sulfuric
Acid-
40%
Phosphoric
Acid-
40%
Nitric
Acid-
50%
Citric
Acid
Ammonia
52100 ChromeEP------------FG
440C Stainless------EPPEEEE
302 StainlessEE--------E------
316 StainlessEEEEPPEEEE
Sterling Armor®EEEE----------E

E = Excellent • G = Good • F = Fair • P = Poor • -- = Will not withstand conditions


Grades and Tolerances - Inches (Typical)

Grade

Size Range
in Inches
Deviation from
Spherical Form
in Inches
Lot Diameter 
Variation in
Inches
Maximum Surface
Roughness*  in
Micro-inches "Ra"
4001/8" - 1".0004± .00048.0
5001/8" - 1".0005± .00058.0
10001/8" - 1".001± .00110.0
20001/8" - 1".002± .00212.0


Grades and Tolerances - Metric (Typical)

Grade

Size Range
in
Millimeters
Deviation from
Spherical
Form in
Millimeters
Lot Diameter
Variation in
Millimeters
Maximum Surface
Roughness*  in
Micro-meters "Ra"
4004 - 25.4.0102± .0102.203
5004 - 25.4.0127± .0127.203
10004 - 25.4.025± .025.254
20004 - 25.4.051± .051.305
* Maximum surface roughness visual comparison

Properties
The FRANTZ® Sterling Armor® Process is a patented manufacturing process that controls time, temperature and gaseous composition creating a surface with superior scuff and wear resistance. Sterling Armor® provides a complete and uniform barrier, imparting a tough, hard diffusion layer capable of withstanding thousands of hours in salt fog testing.

Load Bearing Sterling Armor®
This process is designed for light-loading applications such as light roller conveyors, polymer bearing applications, and applications involving abrasion or wear characteristics.

Non-load Sterling Armor®
This process is well-suited for inertia type systems, such as inertia shut-off switches, seat belt inertia systems, etc. This may also be used for polymer-bearing applications if loading allows.
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