Trinel, Inc. Services

List of Services

Polishing and Grinding

Centerless Grindning

Trinel performs the method of centerless grinding called Thru-Feed. The part, bar or tube, passes in between the grinding and regulating wheels supported by a work rest guide. This produces a product that is round and straight. Alloys, Stainless, Copper and Plastics
  • Bar and tube capabilities up to 100 feet in length.
  • Diameters from 1/16″ to 11 1/2″ in diameter.
  • Tolerances held to .0004 limit.
  • Micro finishes to 10 rms.
  • Small orders or truckloads.
  • Sizes and Tolerances to your specification


Trinel can polish in three different ways:
  1. Polishing (burnishing), when we use a roll straightener on turned product to enhance surface quality.
  2. Belt Sander (picture above), used on larger diameters to size and finish turned, ground and polished bars.
  3. Cork Wheel Diameters to provide customers with desired finishes. Using grinding machines, to produce finishes for chrome plate and turned, ground and polished bars.


  • Bar and tube up to 100 feet in length
  • Diameters from 1/16″ to 12″ diameters
  • Tolerances held to .0005 limit
  • Micro finishes to 8 rms

Chamfering / Cutting / Packaging


Trinel has installed a chamfering machine to do diameters from 1/2″ to 1-1/2″

  • Diameters 1/2″ to 1-1/2″
  • Any Length and Grade
  • Application for Loading Systems or Screw Machines


Saw Cutting

  • All Diameters Cut to Length
  • 1/8″ Tolerance on Cutting
  • Special Packaging Available


Trinel stocks and offers

  • Cardboard tubing for all sizes
  • Cardboard collars
  • Paper wrapping
  • Wood crates and shields
  • Boxing – Wood and Cardboard fiber


  • Trinel can straighten all materials to our customer’s specification whether it is to industry standard (1/8″ to 5′) or to pumpshaft quality (.0015 per foot).
  • We are capable of straightening bar and tube in two different processes, press and rotary.
  • We can produce straightness and inspection reports for tight tolerance jobs. Such as pump shafts, boat shafts and tir readings.
  • We specialize in pump shaft and boat shaft tolerances.


  • Rotary Straightening 3/16″ to 4 1/2″
  • Press Straightening 1″ to 11″
  • Precision Straightening to .003 TIR
  • .001 per foot
  • Up to 100′ length


Production Bar Turning

– 1/2″ to 4 1/2″ Diameter

Trinel has recently purchased a new high production bar turner capable of turning diameters from 1/2″ – 2″. We also have a No. 4 bar peeler capable of turning 1″ – 4 1/2″ diameters.

This process cleans the surface of the bars by removing scale and imperfections. Bars are processed continually through this machine, producing a bar that is round and held to a consistent size.

About Us

Trinel, Inc. was purchased in 1986 by the Martella family. It has been our family’s goal to provide our customers with a quality product that exceeds our customers’ requirements. Since 1986, our company has grown with the addition of new equipment and a commitment to quality. With the completion of our ISO 9002 Certification, we are able to provide our customers with a one stop facility, capable of performing all facets of the bar grinding industry, completely in-house.