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4140 ANN

4140 annealed 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. 4140 in the annealed condition provides good ductility before being hardened to a capability of 50 HRC. 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)

Common Applications

  • AerospaceAerospace
  • IndustrialIndustrial

Benefits

  • Superior Toughness
  • Good Ductility
  • Good Wear Resistance
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4140 ANN

We Stock 4140 ANN to the Following Specifications:

  • AMS-2301
  • AMS-2304
  • AMS-6349 EXC. COND.
  • AMS-6382
  • AMS-S-5626
  • ASTM-A-331
  • MIL-S-5626
  • ASTM A108-CF

Chemical Makeup

ElementMinMax
Carbon, C0.380.43
Manganese, Mn0.751
Silicon, Si0.150.35
Phosphorus, P-0.025
Sulfur, S-0.025
Chromium, Cr0.81.1
Molybdenum, Mo0.150.25
Nickel, Ni-0.25
Copper, Cu-0.25
Aluminum, Al0.020.05
Vanadium, V0.020.08
Columbium/Niobium, Nb0.020.05

Cross-Fittings

Round

There are 41 sizes and conditions.

  • 1/4 - CD
  • 5/16 - CD
  • 3/8 - CD
  • 7/16 - CD
  • 1/2 - CD
  • 9/16 - CD
  • 5/8 - CD
  • 11/16 - CD
  • 3/4 - CD
  • 13/16 - CD
  • 7/8 - CD
  • 15/16 - CD
  • 1 - CD
  • 1-1/16 - CD
  • 1-1/8 - CD
  • 1-3/16 - CD
  • 1-1/4 - T-CD TL
  • 1-5/16 - T-CD TL
  • 1-3/8 - T-CD TL
  • 1-7/16 - T-CD TL
  • 1-1/2 - T-CD TL
  • 1-9/16 - T-CD TL
  • 1-5/8 - T-CD TL
  • 1-3/4 - T-CD TL
  • 1-7/8 - T-CD TL
  • 2 - T-CD TL
  • 2-1/8 - T-CD TL
  • 2-1/4 - T-CD TL
  • 2-3/8 - T-CD TL
  • 2-1/2 - T-CD TL
  • 2-5/8 - T-CD TL
  • 2-3/4 - T-CD TL
  • 2-7/8 - T-CD TL
  • 3 - T-CD TL
  • 3-1/8 - T-CD TL
  • 3-1/4 - T-CD TL
  • 3-1/2 - T-CD TL
  • 3-3/4 - T-CD TL
  • 4 - T-CD TL
  • 4-1/4 - T-CD TL
  • 4-1/2 - T-CD TL

Flat

There are 43 sizes and conditions.

  • 1/4 X 2 - CD
  • 3/8 X 1 - CD
  • 3/8 X 1-1/2 - CD
  • 3/8 X 4 - CD
  • 1/2 X 1 - CD
  • 1/2 X 1-1/2 - CD
  • 1/2 X 2 - CD
  • 1/2 X 2-1/2 - CD
  • 1/2 X 3 - CD
  • 1/2 X 4 - CD
  • 1/2 X 6 - CD
  • 5/8 X 1 - CD
  • 5/8 X 2 - CD
  • 5/8 X 3 - CD
  • 3/4 X 1 - CD
  • 3/4 X 1-1/4 - CD
  • 3/4 X 1-1/2 - CD
  • 3/4 X 2 - CD
  • 3/4 X 2-1/2 - CD
  • 3/4 X 3 - CD
  • 3/4 X 4 - CD
  • 1 X 1-1/4 - CD
  • 1 X 1-1/2 - CD
  • 1 X 1-3/4 - CD
  • 1 X 2 - CD
  • 1 X 2-1/2 - CD
  • 1 X 3 - CD
  • 1 X 4 - CD
  • 1 X 5 - CD
  • 1-1/4 X 2 - CD
  • 1-1/4 X 3 - CD
  • 1-1/2 X 2 - CD
  • 1-1/2 X 2-1/2 - CD
  • 1-1/2 X 3 - CD
  • 1-1/2 X 6 - CD
  • 1-3/4 X 3 - CD
  • 2 X 2-1/2 - CD
  • 2 X 3 - CD
  • 2 X 4 - CD
  • 2-1/2 X 4 - CD
  • 2-1/2 X 6 - CD
  • 3 X 4 - CD
  • 3 X 6 - CD

Square

There are 8 sizes and conditions.

  • 1/2 - CD
  • 5/8 - CD
  • 3/4 - CD
  • 7/8 - CD
  • 1 - CD
  • 1-1/4 - CD
  • 1-1/2 - CD
  • 2 - CD

Hex

There are 9 sizes and conditions.

  • 1/2 - CD
  • 5/8 - CD
  • 3/4 - CD
  • 7/8 - CD
  • 1 - CD
  • 1-1/8 - CD
  • 1-1/4 - CD
  • 1-3/8 - CD
  • 1-1/2 - CD
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