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 $1.71/lb to $2.25/lb, up 0.9% 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.
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Raw Material Market Prices
4.2%30d
Steel HRC
$1,084/short ton
$0.54/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" | $1.71 | $64.43 | 1.2% |
| 8-3/4" | $1.84 | $376.14 | 1.1% |
| 12" | $2.25 | $902.48 | 0.9% |
| 12-1/2" | $2.25 | $977.65 | 0.9% |
| 13" | $2.25 | $1055.84 | 0.9% |
| 13-1/2" | $2.25 | $1137.03 | 0.9% |
| 14" | $2.25 | $1221.22 | 0.9% |
| 14-1/2" | $2.25 | $1308.43 | 0.9% |
| 15" | $2.25 | $1398.64 | 0.9% |
| 16" | $2.25 | $1588.08 | 0.9% |
| 17" | $2.25 | $1789.55 | 0.9% |
| 18" | $2.25 | $2003.05 | 0.9% |
| 19" | $2.25 | $2228.57 | 0.9% |
| 20" | $2.25 | $2403.00 | 0.9% |
| 22" | $2.25 | $2907.63 | 0.9% |
| 24" | $2.25 | $3536.62 | 0.9% |
| 28" | $2.25 | $4709.88 | 0.9% |
| 30" | $2.25 | $5406.75 | 0.9% |
18 items
Prices last updated April 2026
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