When bar stock arrives with an uneven outer diameter or a rough surface, every step after that suffers. Seals wear faster. Bearings fail early. Parts come off the machine out of tolerance. OD grinding solves that problem before the bar ever reaches your operation.
At Precision Ground Bars in Palos Hills, IL, we have been applying outside diameter grinding to round bar stock since 1970. We grind across stainless steel, alloy steel, carbon steel, aluminum, and high-temperature alloys, so your bar arrives ready to machine without additional prep work on your end.
OD Grinding Gives Your Bar Stock the Accuracy Your Application Demands
Outside diameter grinding removes material from the external surface of a round bar to produce a precise finish and tight dimensional control. The result is better concentricity, a cleaner surface, and more consistent sizing than hot-rolled or rough-turned stock can offer your machining operation.
A rough or uneven OD creates problems that build fast. Seal wear accelerates, bearings fail ahead of schedule, and machining chatter starts at the bar, not the tool. Grinding removes those variables before your operation begins, so your downstream process runs on a stable foundation.
What OD Grinding Does for Surface Finish and Straightness
Surface finish is a functional requirement, not a cosmetic one. On a shaft running inside a seal or a bar feeding a screw machine, the OD condition determines how long mating components last. We produce ground steel to the tightest tolerances with precision roundness and surface polish, cut to standard metric sizes or your specific requirements.
Straightness matters equally at speed. A bar that is not straight induces vibration at the bearings and packing during higher-speed operations. Our pump shaft quality bars are held to a super high degree of straightness, specifically to prevent damage and harmful vibrations during machining. OD grinding is central to achieving that.
Materials We Run Through OD Grinding
Our stainless steel inventory covers 303, 304/304L, 316/316L, 410, 416, 420, 430, 440, 455, 13-8 PH, 15-5 PH, 17-4 PH, Duplex, Nitronic 60, and A286. Alloy steel grades include 4130, 4140/4142, 41L42, 8620, and 86L20. Carbon steel covers 1018, 1045, 1117, 1144, 1144 Stressproof, 1215, 12L14, 11L17, and Fatigueproof.
We also grind aluminum grades 2011-T3, 2024, 2024 T351, 6061, and 7075, cut to custom sizes for your specific application requirements. For high-temperature work, Inconel 625 and Monel 400 are available. Inconel requires careful pass management because the material work-hardens rapidly after the first cut, affecting surface integrity.
Services That Work Alongside OD Grinding
OD grinding fits into a broader processing sequence for most orders. Bar straightening corrects distortion from prior processing before grinding begins. After grinding, bar stock is cut to your exact length. Chrome plating can be used for parts facing significant abrasion, friction, or harsh service conditions.
For applications that need the full treatment, our TGP steel takes a bar through turning, grinding, and polishing to achieve the highest level of dimensional straightness and accuracy. TGP is the right call for high-speed motor shafts, pump shafts, crankshafts, and camshafts where straightness failures go straight to bearing wear.
Industries That Depend on OD Ground Bar
Bearing manufacturers reference ID dimensions as their production baseline, so ground shaft stock is not optional. Pump shaft manufacturers rely on our grades 316, 410, 420, and 17-4 PH ground to meet strict diameter and straightness requirements. Swiss screw machine shops need a consistent OD because feed-speed operations cannot absorb incoming bar variation.
Hydraulic cylinder manufacturers need ground rod and barrel stock where surface condition directly controls seal performance in service. Aerospace part suppliers work in titanium, Inconel, and high-strength stainless steel, where OD irregularity affects finished part integrity. We have supplied all of these industries from our Palos Hills, IL, facility since 1970.
Get Precision Ground Bar Stock Built to Your Specification
We are available Monday through Friday, 8 AM to 5 PM. Call us toll-free at (800) 818-0822 or reach our local line at (708) 880-7277. Our team will walk through your grade, diameter, and finish requirements to confirm what we can hold for your application.
Submit your specs directly through our quote form at precisiongroundbars.com. Tell us your grade, size, and any companion services you need, whether that is bar straightening, cutting, chamfering, chrome plating, or custom packaging. We will come back with pricing on exactly what you need.
FAQs
What is the difference between OD grinding and centerless grinding?
OD grinding works on the external bar surface for a precise finish and dimensional control. Centerless grinding uses a blade and a regulating wheel. Both achieve tight tolerance. Contact us to confirm which fits your application.
Which materials can be OD ground at Precision Ground Bars?
We grind stainless steel, alloy steel, carbon steel, aluminum, and high-temperature alloys, including Inconel 625 and Monel 400. Submit a quote with your grade and size for confirmation.
Can I order an OD-ground bar in a non-standard diameter or length?
Yes. We grind to non-standard diameters and cut to your exact specified length. Submit your drawing requirements through our quote form or call us directly at (800) 818-0822.
What services can I combine with OD grinding on a single order?
Bar straightening, bar stock cutting, bar chamfering, chrome plating, TGP processing, and custom packaging are all available to combine with OD grinding on a single order.
