Bar Processing

Our state-of-the-art bar processing equipment and quality systems produce superior products that are delivered on time and defect-free. We begin by sourcing from well-established domestic and international mills that manufacture the finest raw materials for the commercial and industrial industries. After receiving the mill product, all documentation referencing composition is physically checked to ensure the material meets or exceeds customer specifications. It is then straightened and processed according to customer specification. All processes are documented, and the material is checked throughout the manufacturing cycle for accordance with Banner’s quality standards. Our machining/manufacturing processes do not change the physical properties of the material, and all of our processing equipment, software, and administrative systems have gone through the IQ, OQ, and PQ validation process.  The following highlights our manufacturing capabilities related to the processing of ground bar:


Banner offers material turning, turned and ground, and turned/ground/polished (TGP) services for bar products ranging from .250″ through 6.00″ O.D. Bar products can be processed in lengths ranging from 3 to 40 feet. Banner can process a wide variety of materials while holding exacting tolerances on outside diameter, straightness, and length. Please contact us to learn more about our turning capabilities.

Centerless Grinding

Banner has more than 50 centerless grinders and 9 cross roll straighteners to process bar material ranging from .032″ through 9.00″ O.D. Depending on outside diameter, bar lengths to 40′ can be processed. Over 50 years of processing experience allows us to hold exacting tolerences on a wide range of round and shaped products. Upon request, Banner can hold +/-.0001″ O.D. across a 12′ length of bar with surface finish to 8Ra. Depending on material availability, product can ship in as little as three business days.


Straighness plays a critical role in the machinablilty of any material. Materials exhibiting high runout limits spindle speeds, increases cycle time, and prematurely wears tooling. Banner understands this, and straightens all of our material before turning, grinding, or polishing to customer specification. Banner can consistantly hold +/-.006″ total indicated runout across a 24′ bar upon request.


Banner offers chamfered bar end shaping to customers upon request. This valuable service helps material feed smoothly into CNC Swiss-style equipment, and helps prevent material jamming. Banner can chamfer all grades of bar in .375″ through 1.00″ O.D. upon request.

Saw Cutting

Banner offers full saw cutting and cut-to-length service to all customers served. This valuable service provides flexibility and improves efficiency by performing the cutting operation (s) in process. Customers utilizing this service no longer have to dedicate additional in-house processing resources for cutting material to length or desired shape. Banner can cut bars from .500″ through 10.00″ O.D. We also can process flat stock, shaped material, and tubing with very tight tolerance capability upon request.

Tolling Services

Banner offers throughfeed centerless grinding services for customer-supplied bar, tube, and shaped materials. This service is often used by mill producers and regional service centers that need to augment production capabilities or have capacity constraints. Occasionally, large commercial or industrial OEMs with extensive in-house machining capabilities use our tolling services to assure incoming material is ground to near-net shape, with the closest desired surface finish possible to maximize productivity, reduce scrap, and increase throughput.