Centerless Grinding Services for Machined Parts
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Centerless Grinding Done Right.

Checking a Centerless Ground part with a micrometer.

Many manufacturing companies rely on Pioneer Service for their Centerless grinding needs.  We are able to offer production lead times as quick as 24 hours for outside diameter grinding and quantities from one to several million pieces. Centerless ground parts have been the core of our business for over 25 years.

We offer the following grinding services for customer-supplied products:

  • In-Feed Grinding
  • Plunge Grinding
  • Profile Grinding
  • Thru-Feed Grinding

 Thru-Feed Centerless Grinding

Pioneer Service offers Thru-Feed Centerless Grinding for machined metal parts that require the major outside diameter ground. When there are no “centers” and only the outermost OD needs to be ground, the parts can be fed down a chute and between two grinding wheels that spin the part and remove the surface.

  • Part diameters from .045″ (1.14 mm) through 1.0″ (25.4 mm)
  • Large range of part lengths
  • Maximum efficiency grinding
  • Minimum cost grinding
  • Grinding after heat treating eliminates distortion


Infeed, Plunge and Profile Centerless Grinding

We also offer In-Feed Centerless Grinding for parts that typically have more complex profiles along their lengths.   In-feed grinding differs from through-feed grinding in that the part is plunged radially by the grinding wheel rather than being fed axially. In-Feed grinding is typically faster and more economical than multi-step grinding processes.IMG_5110-Pioneer-193-Edit

  • Part diameters from  .045″ (1.14 mm) through 1.0″ (25.4 mm)
  • Multiple outside diameters
  • Best method for maintaining diametric relationships
  • Complex profiles
  • Complex radii
  • Flats and slots ground with more precision than conventional milling
  • Grinding after heat treating eliminates distortion

We can help you complete your orders on-time with great results. Contact our staff today for more details by clicking here.


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“We received your shipment of XXX-XXX. They look great and everything seems to be in spec. They also perform really well which is a huge deal for us as it's given us clarity for our upcoming product release. Thanks again for the quick turn around and all your help!”
Chris H.- Product Development
“Thank you Eric! You have saved our reputation.I am really happy that we will be able to ship them tomorrow. Thank you !!!!!!!!”
Gregory K.- Instrumentation
“You guys are the best!Thank you all for your prompt replies and support. You continue to impress me.”
Mike U.- Aerospace/Defense Company
“Thank you Eric! You have saved our reputation.I am really happy that we will be able to ship them tomorrow. Thank you !!!!!!!!”
Gregory K.- Instrumentation
“We are very pleased with the outcome of the first bushing Pioneer Service produced. I sent an e-mail to James Sass and informed him we will be sending a second bushing we will be needing.”
David M.- Firearms Manufacturer
“My compliments to you and the team for hitting a home run!”
Gene D.- Automotive Aftermarket Manufacturer
“Attached is the new PO … You guys are doing a great job and on time delivery and quality are superb. Keep up the good work.”
Eric H.- Power Industry
“I see your commitment to quality and your deliveries are excellent. I look forward to continue building this relationship.”
Brad D.- Oil & Gas
“I am pleased to let you know that everything was perfect. The documentation was solid, the parts were all within specifications, and they assembled as designed. Not even a single part was out of spec. !”
Scott L.- Medical Device Mfg.
“We got the parts in yesterday afternoon. I opened the box and checked out a few and they looked GREAT! Thanks for all your help, and please pass along our gratitude to your crew as well! AND … thanks for doing such a nice job on the packaging, too.”
Todd K.- Furniture Mfg.
We have been purchasing shafts for our electric motors from Pioneer Service for decades. Pioneer is one of the best, if not the best, supplier of any product we have ever had. Their consistent quality, aggressive pricing and fast response time is unmatched!
Dave B.- Operations Mgr/Sub-fractional AC Motors
Pioneer Service has been a long time supplier and our plants use millions of Pioneer shafts per year. We have had ZERO quality or delivery issues with Pioneer. Forecasting, in our industry, is very difficult and we know we can always rely on Pioneer to expedite our rush orders!
Mike S.- Commodity Mgr/Electric Motors Mfg.
“Pioneer Service…fast quotes, clear communication, good quality, attractive pricing. One of my best vendors!”
Jay B.- Manufacturing Job Shop