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Aircraft Alloys / 4140 NORM

4140 normalized is an aircraft quality low-alloy steel containing chromium, molybdenum, and manganese. The chromium content provides good hardness penetration, and the molybdenum imparts uniform hardness and high strength. This version of 4140 is hot rolled and normalized at 1650 F ( 25 F) and required to meet stringent magnetic inspection criteria. This alloy is characterized by its high fatigue strength, torsional strength, abrasion resistance, and toughness. This material is used to produce piston rods, shafts, crank shafts, gears and other machinery parts. (UNS G41400)

Chemical Makeup

Element	Min	Max
Carbon, C	0.38	0.43
Manganese, Mn	0.75	1
Silicon, Si	0.15	0.35
Phosphorus, P	-	0.025
Sulfur, S	-	0.025
Chromium, Cr	0.8	1.1
Molybdenum, Mo	0.15	0.25
Nickel, Ni	-	0.25
Copper, Cu	-	0.25
Aluminum, Al	0.02	0.05
Vanadium, V	0.02	0.08
Columbium/Niobium, Nb	0.02	0.05

Common Applications

Aerospace
Defense
Industrial

Benefits

Superior Toughness
Good Ductility
Good Wear Resistance

We stock 4140 NORM to the following specifications:

AMS-2301
AMS-2304
AMS-6349
AMS-6382 EXC. COND.
AMS-6529
AMS-S-5626
ASTM-A-322
MIL-S-5626

Click on a cross-section to see the sizes we stock:

Flat
hex
Round
Square

Aircraft Alloys
4140 NORM
Round
41 sizes and conditions:

T-HR TL -
1 - T-HR TL
1-1/8 - T-HR TL
1-1/4 - T-HR TL
1-1/2 - T-HR TL
1-5/8 - T-HR TL
1-3/4 - T-HR TL
1-7/8 - T-HR TL
2 - T-HR TL
2-1/4 - T-HR TL
2-3/8 - T-HR TL
2-1/2 - T-HR TL
2-5/8 - T-HR TL
2-3/4 - T-HR TL
3 - T-HR TL
3-1/8 - T-HR TL
3-1/4 - T-HR TL
3-1/2 - T-HR TL
3-5/8 - T-HR TL
3-3/4 - T-HR TL
4 - T-HR TL
4-1/4 - T-HR TL
4-1/2 - T-HR TL
4-3/4 - T-HR TL
5 - T-HR TL
5-1/4 - T-HR TL
5-1/2 - T-HR TL
5-3/4 - T-HR TL
6 - T-HR TL
6-1/4 - T-HR TL
6-1/2 - T-HR TL
6-3/4 - T-HR TL
7 - T-HR TL
7-1/2 - T-HR TL
8 - T-HR TL
8-1/2 - T-HR TL
9 - T-HR TL
9-1/2 - T-HR TL
10 - T-HR TL
11 - T-HR TL
12 - T-HR TL

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Chemical Makeup

Common Applications

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