General Purpose Chucking Reamers
Precision ground straight shank chucking reamers for high-volume hole sizing in standard steels, cast iron, non-ferrous metals, and plastics. Available in straight and spiral flute configurations.
Precision Hole Finishing Solutions
Industrial Reamers Manufactured to ISO & ANSI Standards
Rock River Tool has engineered and manufactured industrial reamers in the United States since 1986. Whether your machining operation requires standard chucking reamers, coolant-through capability for deep holes, or custom step reamers, our tools feature application-matched micro-grain carbide grades brazed onto toughened alloy steel bodies for optimal performance, vibration dampening, and maximum tool longevity.
Material Specific Chucking Reamers
Specifically engineered geometries and tungsten carbide grades matched to target workpiece materials including abrasive cast irons, stainless steel alloys, and high-silicon aluminum.
Coolant Fed Reamers
Internal coolant channels deliver high-pressure fluid directly to the cutting zone, flushing chips rapidly, reducing heat, and ensuring exceptional hole surface finishes in blind and deep-hole reaming.
Solid Carbide Reamers
Solid micro-grain carbide construction engineered for maximum rigidity, extreme accuracy, and minimal deflection in small-diameter reaming operations on rigid CNC machining centers.
Extended Length Reamers
Designed with elongated shanks to reach deep-set bore features, internal cavity passages, or obstructed workpiece geometries without sacrificing hole concentricity or finish.
Semi Finished Reamers
Pre-brazed semi-finished blanks stocked for fast custom diameter grinding. Ideal for machine shops needing non-standard decimal or metric hole sizing on tight production deadlines.
Solid Carbide Head Reamers
Features a solid carbide cutting head fusion-brazed to a tough alloy steel shank. Provides solid carbide cutting performance at mid-to-large diameters with enhanced impact resistance.
Shell Reamers & Arbors
Economical reaming solution for large-diameter hole finishing. Replaceable carbide-tipped shell cutter mounts securely onto precision-ground taper arbors for high-efficiency production tooling.
Engineering Technical Selection
Selecting the Right Reamer Geometry & Grade
Hole quality, cylindrical tolerance, and tool life depend heavily on selecting the correct reamer structure and carbide grade for your specific workpiece setup.
- C-2 Carbide (Grade 883): Micro-grain grade tailored for cast iron, non-ferrous materials, high-silicon aluminum, and non-metallic composites. Prevents abrasive flank wear.
- C-5 / C-6 Carbide (Grade 370): Tough alloy grade engineered for alloy steel, tool steel, stainless steel, and titanium machining. Resists cratering and shock loading.
- Straight Flute vs. Spiral Flute: Straight flutes are standard for general through-hole applications. Left-hand spiral flutes push chips forward into through holes, protecting finished walls.
- Chucking vs. Coolant Fed: Coolant-fed designs accelerate chip removal in deep holes, preventing chip re-cutting and score marks on internal bore surfaces.
| Reamer Type | Diameter Range | Hole Type | Best Application |
|---|---|---|---|
| Carbide Tipped Chucking | 1/4" – 1-1/2"+ | Through & Blind | General production machining in steel & cast iron |
| Coolant Fed Tipped | 3/8" – 1-1/4" | Deep Hole / Blind | High-speed CNC, deep hydraulic bores & manifolds |
| Solid Carbide Body | .060" – 1/2" | Precision Micro Bore | Ultra-tight tolerance small holes on rigid setups |
| Solid Carbide Head | .250" – 1.00" | Heavy Production | High stiffness with fracture-tolerant steel shank |
| Shell Reamers | 1-1/16" – 2-1/2"+ | Large Bores | Cost-effective reaming of large structural holes |
Technical data based on Rock River Tool manufacturing standards. Custom diameters, special lead angles, and special shank modifications available upon request.
OEM & Custom Tooling Capabilities
Special & Modified Reamer Engineering
When off-the-shelf tools cannot meet print specifications, Rock River Tool provides fast turnaround on custom engineered reamers designed to your exact drawing requirements.
Custom Tool Capabilities
- Step reamers for multi-diameter single-pass machining
- Special decimal and metric reaming diameters ground to +.0001" tolerance
- Custom chamfer angles, lead-in radiuses, and back tapers
- Special shank configurations (Morse Taper, Weldon Flat, Reduced Shank)
- Application-specific PVD/CVD coatings (TiAlN, TiCN, AlTiN, DLC)
Why Overseas Procurement Teams Trust Us
For international buyers and CNC machine operators, tool consistency and predictable lead times are paramount. As an American manufacturer established in 1986, Rock River Tool maintains 100% control over raw material sourcing, induction brazing, CNC grinding, and optical inspection.
- Full traceability from raw alloy stock to finished edge
- Direct engineering support without third-party delay
- Export packaging and worldwide logistics support
Frequently Asked Questions
Technical & Procurement FAQ
Answers to common questions regarding reamer selection, tolerances, and custom ordering.
Carbide tipped reamers combine premium micro-grain carbide tips for cutting edge wear resistance with an alloy steel body that provides superior shock absorption and fracture toughness. This structure delivers maximum rigidity during heavy machining, prevents premature tool breakage in interrupted cuts, and significantly lowers cost per tool on diameters over 1/2 inch.
Our standard chucking reamers are precision ground to nominal industry size tolerances (+.0003" / -.0000"). Custom reamers can be manufactured to ultra-tight hole finishing tolerances down to +.0001" / -.0000" upon request.
Coolant fed reamers are ideal for deep hole applications, blind hole finishing, high-speed CNC reaming, and gummy or abrasive materials. Internal coolant delivery flushes chips directly away from the cutting zone, controls thermal expansion, and drastically improves hole concentricity and micro-finish.
You can send your CAD drawing or tool specification parameters directly to our engineering team. We will review geometry requirements, carbide grade selection, and manufacturability before providing a detailed quotation and estimated lead time.
Global Tooling Procurement
Need High-Precision Reamers for Production?
Our application engineers are ready to assist you with standard catalog tooling selection, material speed & feed parameters, or custom step reamer design.