Steel 4140 Round Bar Prices
Current 4140 Steel Round Bar prices by dimension, with $/lb for cross-size comparison.
4140-Quenched & Tempered Round Bar currently ranges from $1.97/lb to $2.47/lb, up 3.8% over the last 7 days.
About 4140|The workhorse alloy steel. Chromium-molybdenum with 0.40% carbon gives you excellent strength, toughness, and wear resistance through a wide range of heat treatments. Available annealed, normalized, or pre-hardened (Q&T to 28-32 HRC). Pre-hardened 4140 machines well with carbide at moderate speeds. Don't dwell or take light cuts. It will work-harden if you rub instead of cut, so keep the feed up (0.006-0.010 IPR minimum) and maintain a productive depth of cut. Chips break cleanly. Weldable with preheat and proper procedure, but it's not casual. The 4140 you buy at the distributor is not all the same. 'Pre-hard' is vague. Ask for the actual hardness and MTRs. Compare to 4340 (stronger, tougher, more expensive), 1045 (cheaper but less hardenable), 8620 (case-hardening steel, different use case), and ETD-150 (pre-hardened alternative that skips heat treat).
About Round Bar|The default starting stock for lathe work. It gets turned, bored, and parted into shafts, pins, bushings, spacers, and just about anything round.
Raw Material Market Prices
2.6%30d
Steel HRC
$1,244/short ton
$0.62/lb
Hot Rolled Coil (HRC) is the benchmark for raw steel prices.
Show additional sizes(49 products, retail pricing)
Diameter
Diameter | $/lb | $/ft | 7d |
|---|---|---|---|
| 3-3/4" | $1.97 | $74.23 | 3.7% |
| 8-3/4" | $2.06 | $421.11 | 4.6% |
| 12" | $2.47 | $990.72 | 3.8% |
| 12-1/2" | $2.47 | $1073.25 | 3.8% |
| 13" | $2.47 | $1159.07 | 3.8% |
| 13-1/2" | $2.47 | $1248.20 | 3.8% |
| 14" | $2.47 | $1340.63 | 3.8% |
| 14-1/2" | $2.47 | $1436.36 | 3.8% |
| 15" | $2.47 | $1535.39 | 3.8% |
| 16" | $2.47 | $1743.36 | 3.8% |
| 17" | $2.47 | $1964.53 | 3.8% |
| 18" | $2.47 | $2198.90 | 3.8% |
| 19" | $2.47 | $2446.48 | 3.8% |
| 20" | $2.47 | $2637.96 | 3.8% |
| 22" | $2.47 | $3191.93 | 3.8% |
| 24" | $2.47 | $3882.42 | 3.8% |
| 28" | $2.47 | $5170.40 | 3.8% |
| 30" | $2.47 | $5935.41 | 3.8% |
18 items
Prices last updated September 2026
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