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All Categories > Carbon Bars, Plates, Tubing and Structural > Cold Finished Carbon Steels > Fatigueproof-Cold Finished Carbon Steels > Fatigue-Proof-Cold Drawn Finished Carbon Steels-Rounds > Size 5/16  
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Size 5/16, Fatigue-Proof-Cold Drawn Finished Carbon Steels-Rounds

FATIGUE-PROOF is a medium-carbon free-machining steel with higher mechanical properties than its companion product, STRESSPROOF. These properties are produced by a process of drawing steel at elevated temperatures, developed and patented by LaSalle Steel Co. The result is a steel with high tensile strength, uniformity of properties, and excellent machinability.
This product possesses high strength as it is received from the mill, and no subsequent heat treatment is required. The strength is remarkably uniform from the surface to the center of the bar and from end to end. Properties are not adversely affected by exposure to temperatures up to 600°F. Where higher hardness is required, material may be selectively hardened by induction heating. Water quenching will produce Rockwell "C" 60, and oil quenching will yield Rockwell "C" 50-55.
FATIGUE-PROOF has excellent machinability for a material of its strength. In standard practice, it will machine up to 25% faster than annealed alloy steels and up to 75% faster than heat-treated alloy steels. Excellent dimensional stability is maintained. Tool use as well as surface finish is better.

Stock Lengths: 12' Approx.

ASTM A311 Class B

Color Marking: Ends painted Red and White


Estimated Weight per Foot

.2610 lb

Estimated Weight 12-Ft. Bar

3.132 lb


Carbon .40./.48
Manganese 1.35/1.65
Phosphorus .04 Max.
Sulphur .24/.33 Max.
Silicon .15/.35


Shafts, spindles, gears, arbors, pinions, lead screws, wrist pins, milling machine spindles, splined power take-off shafts, pump shafts, etc.

Mechanical Properties

FATIGUE-PROOF possesses the minimum tensile, yield, and hardness values shown below. Other properties shown are typical of the grade.
Tensile Strength - 140,000 psi
Yield Strength - 125,000 psi
Elongation in 2" - 5-15%
Reduction of Area - 15-30%
Brinell Hardness - 280


FATIGUE-PROOF machines approximately 80% as fast as 1212. Average surface cutting speed is 134 feet per minute.


Welding of this grade is not recommended. However, it can be welded using a coated low hydrogen rod. Amperage and penetration must be kept low. brFATIGUE-PROOF is a registered Trademark of the LaSalle Steel Co., producers of the material.


Tolerance - Cold Finished Carbon Bars
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