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These are oil-hardening steels of relatively high hardenability. Their chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. These grades are especially suitable for forging because they have self-scaling characteristics. They respond readily to heat treatment and are comparatively easy to machine in the heat treated condition. They resist creep in temperatures up to 1000°F and maintain their properties even after long exposure at these relatively high working temperatures. With a combination of such highly desirable properties as good strength and wear resistance, excellent toughness coupled with good ductility, and the ability to resist stress at elevated temperatures, it is understandable why these are widely used and highly successful alloy steels.

This material is also available as leaded steel. The addition of lead improves machinability without sacrificing other desirable properties, with the exception that the use of this material is not recommended for applications over 400°F, since at elevated temperature ductility is low.

The following specifications are generally applicable for 4140/42 Heat Treated Rounds: ASTM A 193, Grade B7; ASTM A 434, Grades BC and BD.

Machine Straightened — Maximum Brinell 212

Stock Lengths 20' Approx.
Unit of Measure
1 2 

Size

Estimated Weight per Foot

Estimated Weight 20-Ft. Bar

3/8 N/A .3759 lb N/A 7.517 lb
1/2 N/A .6682 lb N/A 13.36 lb
9/16 N/A .8457 lb N/A 16.91 lb
5/8 N/A 1.044 lb N/A 20.88 lb
11/16 N/A 1.263 lb N/A 25.27 lb
3/4 N/A 1.504 lb N/A 30.07 lb
7/8 N/A 2.046 lb N/A 40.93 lb
1 N/A 2.673 lb N/A 53.46 lb
1 1/8 N/A 3.383 lb N/A 67.66 lb
1 1/4 N/A 4.176 lb N/A 83.53 lb
1 5/16 N/A 4.604 lb N/A 92.09 lb
1 3/8 N/A 5.053 lb N/A 101.1 lb
1 7/16 N/A 5.523 lb N/A 110.5 lb
1 1/2 N/A 6.014 lb N/A 120.3 lb
1 5/8 N/A 7.058 lb N/A 141.2 lb
1 3/4 N/A 8.186 lb N/A 163.7 lb
1 7/8 N/A 9.397 lb N/A 187.9 lb
2 N/A 10.69 lb N/A 213.8 lb
2 1/8 N/A 12.07 lb N/A 241.4 lb
2 1/4 N/A 13.53 lb N/A 270.6 lb
2 3/8 N/A 15.08 lb N/A 301.5 lb
2 1/2 N/A 16.71 lb N/A 334.1 lb
2 5/8 N/A 18.42 lb N/A 368.4 lb
2 3/4 N/A 20.21 lb N/A 404.3 lb
2 7/8 N/A 22.09 lb N/A 441.9 lb
3 N/A 24.06 lb N/A 481.1 lb
3 1/8 N/A 26.10 lb N/A 522.0 lb
3 1/4 N/A 28.23 lb N/A 564.6 lb
3 3/8 N/A 30.45 lb N/A 608.9 lb
3 1/2 N/A 32.74 lb N/A 654.8 lb
3 5/8 N/A 35.12 lb N/A 702.5 lb
3 3/4 N/A 37.59 lb N/A 751.7 lb
3 7/8 N/A 40.14 lb N/A 802.7 lb
4 N/A 42.77 lb N/A 855.3 lb
4 1/8 N/A 45.48 lb N/A 909.6 lb
4 1/4 N/A 48.28 lb N/A 965.6 lb
4 1/2 N/A 54.13 lb N/A 1083 lb
4 5/8 N/A 57.18 lb N/A 1143 lb
4 3/4 N/A 60.31 lb N/A 1206 lb
5 N/A 66.82 lb N/A 1336 lb
5 1/8 N/A 70.21 lb N/A 1404 lb
5 1/4 N/A 73.67 lb N/A 1473 lb
5 3/8 N/A 77.22 lb N/A 1544 lb
5 1/2 N/A 80.86 lb N/A 1617 lb
5 3/4 N/A 88.37 lb N/A 1767 lb
6 N/A 96.22 lb N/A 1924 lb
6 1/4 N/A 104.4 lb N/A 2088 lb
6 1/2 N/A 112.9 lb N/A 2259 lb
6 3/4 N/A 121.8 lb N/A 2436 lb
7 N/A 131.0 lb N/A 2619 lb
Unit of Measure
1 2