- 1st Source Gun Drilling & Machining
- Deep holes for water lines for cooling or heating, precision holes for cartridge heaters, lubrication lines in shafts, lines for hydraulics or air actuation.
- American Hollow Boring Co.
- Deep hole drilling, trepanning, honing, machining and saw cutting services.
- American Machine & Gundrilling
- Specialized in deep hole drilling.
- Apperley Honing
- Offers honing service for one off components as well as production batches.
- BC&F Tool Company
- Specializes in small hole diameter gundrilling.
- Dearborn, Inc.
- Internal machining specialists, provides gundrilling, deephole drilling, honing, trepanning, cnc-milling, cnc-turning, prototype machining, finished machine parts and concentric tubing.
- Deep Hole Specialists
- Deep hole drilling source for gundrilling, trepanning, spade drilling, honing and turning.
- Mollart
- Gundrilling, deep hole drilling machines and tooling systems.
- Nelson Precision Drilling Co.
- Gun drilling of stainless, alloy, hi-temp nickel alloy materials of varying shapes and sizes.
- Trepanning Specialties Inc.
- Gundrilling materials as common as stainless steel to exotic metals such as titanium, as well as non-metallic materials such as wood and plastics.
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