Picking between 1018 vs 1045 carbon steel comes down to one question: what does your part actually need to do? Both grades are carbon steels, but they serve different jobs on the shop floor.
We’ve supplied carbon round bar from Arlington Heights since 1970. When buyers call us, O’Hare Precision Metals helps them land on the right grade fast, before the order goes in and before a wrong spec creates rework downstream.
How Carbon Content Drives Every Decision
Carbon content is what separates these two grades, and it controls strength, weldability, and heat treat response all at once. Understanding that single difference makes the rest of the selection process straightforward for any engineer or procurement buyer.
Getting the grade wrong doesn’t just affect part performance. It affects your machining time, your tooling life, and whether the finished part survives in service. Both grades are worth understanding clearly before you commit to either one.
1018: Low Carbon, Easy to Work With
1018 is a mild, low-carbon steel. Its ductility makes it the right call for parts that need crimping, bending, or forming without cracking. Tooling lasts longer, setup is predictable, and it welds cleanly without complex prep work.
For high-volume runs on general machine parts, 1018 delivers consistent machinability run after run. It’s not a high-strength grade, but for fabrication work and moderate-duty components, it handles the job without overcomplicating your process.
1045: Medium Carbon, Built for Load-Bearing Parts
1045 carries more carbon than 1018, and that directly raises its strength and wear resistance. It’s the most common shafting steel in our carbon round bar line because it handles torsional loads, resists wear at journal surfaces, and responds correctly to induction hardening.
If your part rotates, carries a bearing, or faces cyclical stress in service, 1045 is the grade to spec. Machinability is still solid on a production CNC. The slightly higher demand on tooling is a fair trade for what the material delivers under load.
Precision Grinding and What It Means for Your Order
The grade sets material properties. The grinding process sets the condition that the bar arrives in. O’Hare Precision Metals holds tolerances to .0001 inches on centerless ground bar and achieves a surface finish of 8 micro inches or better, covering both 1018 and 1045.
For 1045 shaft stock, especially, receiving precision ground bar means your turning operation starts from a known, clean dimension. Our centerless grinding runs up to 9 inches in diameter and 50 feet in length, so larger shaft applications stay in one supplier relationship without compromise.
Companion Services That Keep Your Order Moving
Saw cutting is the most common add-on for carbon round bar. Our CNC automated cold saws cut up to 7 inches in diameter, producing clean ends with tighter tolerances than bandsawing or friction sawing. Bar arrives ready to run, not ready to prep.
We also offer turning, chamfering, milling, and custom machining on-site. If your part needs a finished diameter, a chamfered end, or a milled feature, that work happens here rather than moving to a secondary processor and adding time to your schedule.
Get Your Carbon Round Bar Quoted Today
O’Hare Precision Metals stocks 1018, 1045, and a full carbon round bar line, including 1020, 1030, 1035, 1040, 1050, free machining grades like 12L14, stress-proof 1144, and fatigue-proof carbon round bar. We’re ISO 9001:2015 certified with quality control inspections at every phase.
Reach out Monday through Friday, 9:00 am to 5:00 pm CST. Submit your specs through our Request A Quote form, call (847) 640-6050, or email sales@ohareprecision.com. Tell us your grade, diameter, length, and quantity, and we’ll take it from there.
FAQs
Is 1018 or 1045 easier to machine?
1018 is more forgiving on tooling due to its low carbon content and ductility. Both grades run well on a production CNC.
Can 1045 be induction hardened but not 1018?
Correct. 1045 responds to induction hardening because of its medium carbon content. 1018’s low carbon content does not support that process.
What tolerances do you hold on precision ground carbon bar?
We hold tolerances to .0001 inches with a surface finish of 8 micro inches or better on centerless ground carbon round bar.
Do you cut carbon round bar to length?
Yes. Our CNC cold saws cut up to 7 inches in diameter, producing clean, tight-tolerance cuts ready for your machining operation.