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4140H Hot Rolled SBQ Bar

Grade 4140H is used for applications requiring enhanced mechanical properties. The “H” indicates the material meets hardenability according to ASTM A304. Eaton Steel Bar Company stocks many diameters of 4140H hot rolled steel bar available to meet the market demand.

4140h hot-rolled-steel-bar


We supply 4140H steel bar to various industries including oil and gas and automotive. Typical applications for 4140H steel bar stock include:

  • Gears
  • Crank shafts
  • Oil & gas equipment

Shapes and Sizes

Eaton Steel Bar Company supplies 4140H steel bar stock in a variety of sizes ranging from 2½”- 15”. Other sizes may be available, contact Eaton Steel for more information. The shapes available for this grade include:

***Minimum Total Quantity Per Order is 10,000 lbs.***

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Standard "4140H Grade" Chemical Composition

Carbon 0.37-0.44
Manganese 0.65-1.10
Phosphorus (max) 0.035
Sulfur (max) 0.040
Silicon 0.15-0.35
Chromium 0.75-1.20
Molybdenum 0.15-0.25


Estimated Mechanical Property Ranges for "Grade 4140H"

Tensile strength (psi) 95,000 - 105,000
Yield strength (psi) 65,000 - 75,000
Elongation in 2” (%) 20 - 30
Reduction of area (%) 35 - 45
Brinell Hardness (BHN) 200 - 230