Honematic Machine Corporation
- A complete source for precision hollow components. Services include deep hole drilling, honing, OD/ID grinding and CNC turning and milling.
- http://www.honematic.com

Nelson Precision Drilling
- Precision deep hole drilling and honing services
- http://www.nelsondrilling.com/

Gundrilling Solutions
- Specializes in providing advice and help with gundrilling problems and applications. Site explains capabilities and incorporates detailed account of process, configurations, applications, troubleshooting tips, and tool wear guide.
- http://www.gundrillingsolutions.com

Dearborn Inc.
- Gundrilling company with extensive range of capabilities serving variety of industries. Includes trepanning, honing, and pattern and concentric tube drilling. Site incorporates examples of complex and unusally shaped end products.
- http://www.dearborninc.com

K. Simke Gundrilling
- Canada. Specializes in gundrilling work, with particular emphasis on advantages of process for the moldmaking industry. Experience includes space, missile, machinery building, and oil drilling tool jobs.
- http://www.gundrilling.ca

1st Source Gun Drilling & Machining
- Job shop specializing in drilling deep holes for industrial markets, primarily in the southeastern USA. Applications include cooling and heating water lines, heater cartridges, lubricated shafts, and hydraulic and air actuators.
- http://gundrillingdeep.com

BC & F Tool Company
- Specializes in small hole gundrilling.
- http://www.bcf-gundrilling.com

American Machine & Gundrilling
- Specializes in hole drilling solutions with hole diameters from .078 inch to 2.75 inch and lifting capacities from 2 oz. to 20,000 lbs.
- http://www.amgundrilling.com/

Dadson
- Precision gundrilling machines and contract gundrilling services. Also, BTA and ejector drilling, deep hole boring machines, high pressure coolant systems.
- http://www.dadsoncorp.com

Mollart Deep Hole Drilling Systems
- Contract deep hole drilling services. Holes from 0.8mm to 300mm diameter and up to 4000mm deep. Deep hole drilling machines and tools for gundrilling, BTA and ejector technologies.
- http://www.mollart.com/

American Hollow Boring Co
- Specialists in deep hole boring since 1918.
- http://www.ahb-erie.com/

Apperley Honing Ltd
- Independent specialist contract honing company in the UK.
- http://www.apperleyhoning.co.uk/

Deep Hole Specialists
- Deep hole drilling, gundrilling, trepanning, honing for the metalworking industry.
- http://www.deephole.com/

Trepanning Specialties Inc.
- Custom wall tubing, rings, and machined parts using trepanning, gundrilling, boring and honing.
- http://www.trepanningspec.com

Dearborn Precision Tubular
- Deep hole machining services include gundrilling, trepanning, boring, honing, threading, milling, turning and straightening, for the aerospace, oilfield, medical, nuclear, power generation and capital equipment industries.
- http://www.dearbornprecision.com/