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All Categories > Alloyed Bars and Plates > Aircraft Alloy Steels > Hot Rolled Aircraft Alloy Bars > 4140 Aircraft Alloy Bars > 4140 Aircraft Hot Rolled Normalized Alloy - Rounds > Size 1 5/8  
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Size 1 5/8, 4140 Aircraft Hot Rolled Normalized Alloy - Rounds

This chromium molybdenum alloy is a deep hardening steel used where strength and impact toughness are required. It has high fatigue strength making it suitable for critical stressed applications at normal as well as elevated temperatures. For increased resistance to wear and abrasion, it may be nitrided.
This grade is a quality product melted under the best of steelmaking practices for aircraft quality steels. It is vacuum degassed to meet the magnetic particle inspection standards of AMS 2301.

UNS G41400, MIL-S-5626 - AMS 6382 - AMS 2301

Color Marking:
Normalized Bars—Ends painted Gray
Annealed Bars—Ends painted Brown

Physical Conditions D
Surface Condition 1

Stock Lengths: 12' and 20'

Specifications  · Analysis  · Applications  · Hardening  · Heat Treating


Estimated Weight per Foot

7.058 lb

Estimated Weight 20-Ft. Bar

141.2 lb

Carbon .38/.43
Manganese .75/1.00
Phosphorus .025 Max.
Sulphur .025 Max.
Si. .20/.35
Cr. .80/1.10
Mo. .15/.25

Intended for general use for parts with sections 1/2" or less in thickness at time of heat treatment which require a through-hardening steel capable of developing hardness as high as Rockwell "C" 50; also for fittings and forgings of greater hardness or variation in thickness at proportionately lower hardnesses. It is frequently used in applications in which 8640 (MIL- S-6049) is specified.

End-quench hardenability values for this grade are Rockwell "C" 50 minimum at 6/16" and Rockwell "C" 44 minimum at 9/16"

Heat Treating
Normalize— 1600°/1700°F


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