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Gun Reamers

Single, double and multi-edge tools engineered for linearity and surface finish.

A gun reamer is a single-pass, coolant-fed finishing tool designed to bring a pre-drilled bore to final diameter, tolerance, and surface finish in one operation. Unlike conventional chucking reamers, gun reamers are built for deep bore applications — maintaining straightness, roundness, and finish consistency at depths where standard reaming tools deflect or chatter.

Gole Precision Tools Pvt. Ltd. manufactures carbide-tipped gun reamers in single cutting edge, double cutting edge, and multiple cutting edge configurations — each suited to specific production requirements, feed rate targets, and bore finish demands.

Single, Double, and Multiple Cutting Edge — What Each Configuration Does

The number of cutting edges on a gun reamer is not a matter of preference — it is an engineering decision based on the bore requirement, workpiece material, and production throughput.

Single Cutting Edge Gun ReamerThe single cutting edge configuration is the precision standard for gun reaming. With one cutting edge and one or more burnishing lands, the tool self-centres in the bore and produces exceptional straightness and surface finish. Radial cutting forces are low and predictable, making this the correct choice when linearity and finish are the primary requirements over feed rate.
Best suited for: tight tolerance bores, deep length-to-diameter ratios, applications where bore straightness is critical across the full depth.
Double Cutting Edge Gun ReamerTwo cutting edges increase the material removal rate while retaining the guided, self-piloting behaviour characteristic of gun reaming. The double edge configuration is a practical middle ground — improved feed rate over a single edge tool without the setup sensitivity of a multi-flute reamer.
Best suited for: medium-volume production, bores requiring a balance of finish quality and cycle time, materials that respond well to balanced cutting forces.
Four & Multiple Cutting Edge Gun ReamerMultiple cutting edges deliver the highest feed rates in gun reaming. The increased number of edges distributes chip load, reduces cutting force per edge, and allows significantly faster penetration. This is the configuration of choice for high-volume production lines where cycle time is a direct cost driver.
Best suited for: hydraulic valve body reaming, tandem master cylinder bores, transfer line production, any application where throughput is the primary objective alongside acceptable finish and tolerance.
Gun reamer edge design
Single/Double Cutting Edge
Gun reamer components
Four Cutting edge

Primary Applications

Our Gun reamers are specified across precision engineering sectors where bore finish, diameter tolerance, and cylindricity directly affect component function.

Hydraulic Valve Bodies Valve spool bores require tight diameter tolerance and a consistent surface finish to ensure proper sealing and spool movement without leakage or stiction. Gun reaming in a single pass eliminates the variation introduced by multi-pass conventional reaming.

Tandem Master Cylinders The tandem master cylinder bore is a classic gun reaming application — deep, precise, and produced in high volume. The bore finish directly affects piston seal life and hydraulic system performance. Multi-edge gun reamers are standard on these production lines.

Hydraulic Cylinders and Actuators Deep bores in hydraulic cylinder bodies demand straightness and finish that conventional reamers cannot maintain at depth. Gun reamers maintain bore geometry from entry to exit.

Fuel System Components Injector body bores, pump housings, and fuel rail components require consistent finish and diameter control across production batches. Gun reaming delivers the repeatability these applications demand.

Pneumatic Components Compressor bodies, valve blocks, and pneumatic actuator housings — wherever a finished bore must seal reliably against a moving element.

General Precision Engineering Any pre-drilled bore requiring final diameter control, improved surface finish, and cylindricity correction in a single productive pass.

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