Deep Hole Drilling GuidePractical technical reference
USA · Machine Manufacturer

Kays Engineering — Deep Hole Drilling Machine Manufacturer

Kays Engineering manufactures the Eldorado, DeHoff and TechniDrill brands of deep hole drilling machines, including gundrilling and BTA/STS systems — all designed and built in Marshall, Missouri, USA.

1980Founded
USACountry
0.039–12 in (1.0–254 mm)Bore range
Up to 240 in (6,096 mm)Max depth
OVERVIEW

About Kays Engineering

Kays Engineering, Inc. designs and manufactures deep hole drilling machine tools in Marshall, Missouri, USA, home to the Eldorado, DeHoff and TechniDrill brands of gundrilling and BTA/STS drilling machines. All machines are built to order in-house in its 50,000 square foot facility, serving job shops, the medical industry and high-volume producers in automotive, aerospace, firearms and oil & gas. The brands trace their heritage to Eldorado (1948), DeHoff (1956) and TechniDrill (1984).

Deep Hole Drilling Machines – Manufacturer of Eldorado, DeHoff, and TechniDrill Precision Machine Tools

Company typeMachine Manufacturer
LocationMarshall, Missouri, USA
Founded1980
ManufacturingOwn factory
Factory area50,000 square feet (Marshall-Saline Industrial Park)
Employees60+ employees
Plants900 Industrial Drive, Marshall, MO 65340, USA
MapOpen in Google Maps
Websitehttps://kaysengineering.com

Company information is based on Kays Engineering, Inc.'s public website and was last reviewed on 2026-08-10. Verify specifications directly with the supplier before purchase.

PRODUCT LINE

Machines & Capabilities

AttributeDetail
Machine typesGundrilling and BTA/STS (single-tube system) deep hole drilling machines across three brands: Eldorado small-diameter gundrilling machines (0.039–0.750 in), DeHoff gundrilling, BTA/STS, multi-axis and gun barrel machines (0.75–2 in), and TechniDrill gundrilling and BTA/STS machines (2–12 in). Available with single or multiple spindles, workpiece counter-rotation, custom fixturing and automation.
BrandsEldorado, DeHoff, TechniDrill
Bore range0.039–12 in (1.0–254 mm)
Max drilling depthUp to 240 in (6,096 mm)
Processesgun-drilling, bta, sts
ApplicationsJob-shop gundrilling, Medical device drilling, Automotive high-volume production, Aerospace components, Firearms / gun barrel drilling, reaming and rifling, Petroleum and oil & gas components, Agriculture, Plastic molding, Energy
Certifications— (to be published)
Eldorado M75gun-drilling
Bore range
0.039 – 0.750 in (1.0 – 19.1 mm)
Max depth
Up to 48 in (1,219 mm) slide travel
Spindles
1 or 2
Spindle power
3 hp (2.2 kW)
Feed
0.3 – 99.9 in/min (7.6 – 2,537 mm/min)
CNC control
PC-based (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
2,500 psi (170 bar)
Coolant flow
20 gpm (75.7 L/min)
Filtration
Primary 5µ / pre-filter 10µ (two-stage cartridge type)
Eldorado KM75gun-drilling
Bore range
0.039 – 0.750 in (1.0 – 19.1 mm)
Max depth
Z = 48 in (1,219 mm) slide travel
Spindles
1
Spindle speed
300 – 16,000 RPM
Spindle power
3 hp (2.2 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based 3-axis CNC (Beckhoff Controls, Microsoft Windows OS), G-Code
Coolant pressure
2,500 psi (170 bar)
Coolant flow
20 gpm (75.7 L/min)
Filtration
Primary 5µ / pre-filter 10µ (two-stage cartridge type)
Workpiece weight
Max table load 2,000 lb (907 kg); table 30 x 40 in (762 x 1,016 mm)
DeHoff 10 Seriesgun-drilling
Bore range
1 in (25.4 mm)
Max depth
36/60/84 in (up to 2,134 mm) slide travel
Spindles
1 or 2
Spindle speed
200 – 8,000 RPM
Spindle power
5 hp (3.7 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
1,800 psi (124 bar)
Coolant flow
45 gpm (170 L/min)
Filtration
10µ (twin filter canisters)
DeHoff 20 Seriesgun-drilling
Bore range
2 in (50.8 mm)
Max depth
36/60/84/120 in (up to 3,048 mm) slide travel
Spindles
1 or 2
Spindle speed
Standard duty 400 – 4,000 RPM; High Torque 100 – 4,800 RPM
Spindle power
10 hp (7.5 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
2,000 psi (138 bar)
Coolant flow
60 gpm (227 L/min)
Filtration
10µ (twin filter canisters)
DeHoff Multi-Axis 536T CNC
Bore range
0.5 in (12.7 mm)
Max depth
Z = 36 in (914 mm) slide travel
Spindles
2
Spindle speed
1,500 – 6,000 RPM
Spindle power
3 hp (2.2 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based CNC (Beckhoff Controls, Microsoft Windows OS), G-Code
Coolant pressure
2,000 psi (138 bar)
Coolant flow
45 gpm (170 L/min)
Filtration
10µ
Workpiece weight
Max table load 2,200 lb (998 kg)
DeHoff Multi-Axis 1036 CNC
Bore range
1 in (25.4 mm)
Max depth
Z = 36 in (914 mm) slide travel
Spindles
1
Spindle speed
1,500 – 6,000 RPM
Spindle power
5 hp (3.7 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based CNC (Beckhoff Controls, Microsoft Windows OS), G-Code
Coolant pressure
1,800 psi (124 bar)
Coolant flow
34 gpm (129 L/min)
Filtration
10µ
Workpiece weight
Max table load 2,200 lb (998 kg)
DeHoff Multi-Axis 2072 TC
Bore range
2 in (50.8 mm)
Max depth
Z = 72 in (1,829 mm) slide travel
Spindles
1 gundrilling spindle + 1 CAT40 auxiliary spindle
Spindle speed
400 – 4,000 RPM
Spindle power
10 hp (7.5 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based CNC (Beckhoff Controls, Microsoft Windows OS), G-Code
Coolant pressure
1,500 psi (103 bar)
Coolant flow
60 gpm (227 L/min)
Filtration
10µ
Workpiece weight
Max table load 9,000 lb (4,082 kg)
DeHoff BTA/STS 20bta
Bore range
2 in (50.8 mm)
Max depth
36/60/84/120 in (up to 3,048 mm) slide travel
Spindles
1
Spindle speed
92 – 4,875 RPM
Spindle power
20 hp (14.9 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
500 psi (34.5 bar)
Coolant flow
60 gpm (227 L/min)
Filtration
10µ
DeHoff BTA/STS 30bta
Bore range
3 in (76.2 mm)
Max depth
120 in (3,048 mm) slide travel
Spindles
1
Spindle speed
60 – 2,190 RPM
Spindle power
40 hp (29.8 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
500 psi (34.5 bar)
Coolant flow
120 gpm (454 L/min)
Filtration
10µ
DeHoff BTA/STS 40bta
Bore range
4 in (102 mm)
Max depth
60 in (1,524 mm) slide travel
Spindles
1
Spindle speed
60 – 2,190 RPM
Spindle power
50 hp (37.3 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
500 psi (34.5 bar)
Coolant flow
150 gpm (568 L/min)
Filtration
10µ
DeHoff BTA/STS 60bta
Bore range
6 in (152 mm)
Max depth
60 in (1,524 mm) slide travel
Spindles
1
Spindle speed
60 – 2,190 RPM
Spindle power
100 hp (74.6 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
500 psi (34.5 bar)
Coolant flow
150 gpm (568 L/min)
Filtration
10µ
DeHoff Gun Barrel G560-DR2 Drilling & Reaming
Bore range
17 – 50 caliber
Max depth
36/60 in (up to 1,524 mm) slide travel
Spindles
2
Spindle speed
1,000 – 8,000 RPM
Spindle power
5 hp (3.7 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
1,800 psi (124 bar)
Coolant flow
60 gpm (227 L/min)
Filtration
10µ
DeHoff Gun Barrel G548-D4 Drilling w/ Automation
Bore range
17 – 50 caliber
Max depth
48 in (1,219 mm) slide travel
Spindles
4
Spindle speed
1,300 – 7,800 RPM
Spindle power
7.5 hp (5.6 kW)
Feed
0.1 – 30 in/min (2.5 – 762 mm/min)
CNC control
PC-based (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
2,000 psi (138 bar)
Coolant flow
60 gpm (227 L/min)
Filtration
10µ
TechniDrill 75-48 CNC Kneegun-drilling
Bore range
0.75 in (19.1 mm)
Max depth
Z = 48 in (1,219 mm) slide travel
Spindles
1
Spindle speed
2,000 – 8,000 RPM
Spindle power
3 hp (2.2 kW)
Feed
0.1 – 24 in/min (2.5 – 610 mm/min)
CNC control
PC-based CNC (Beckhoff Controls, Microsoft Windows OS), G-Code
Coolant pressure
1,500 psi (103 bar)
Coolant flow
10 gpm (37.9 L/min)
TechniDrill 125-48 CNC Kneegun-drilling
Bore range
1.25 in (31.8 mm)
Max depth
Z = 48 in (1,219 mm) slide travel
Spindles
1
Spindle speed
500 – 8,000 RPM
Spindle power
10 hp (7.5 kW)
Feed
0.1 – 24 in/min (2.5 – 610 mm/min)
CNC control
PC-based CNC (Beckhoff Controls, Microsoft Windows OS), G-Code
Coolant pressure
1,500 psi (103 bar)
Coolant flow
20 gpm (75.7 L/min)
TechniDrill 200-96 TC
Bore range
2 in (50.8 mm)
Max depth
Z = 96 in (2,438 mm) slide travel
Spindles
1 gundrilling spindle + 1 CAT40 auxiliary spindle
Spindle speed
500 – 4,500 RPM
Spindle power
25 hp (18.6 kW)
Feed
0.1 – 24 in/min (2.5 – 610 mm/min)
CNC control
PC-based CNC (Beckhoff Controls, Microsoft Windows OS), G-Code
Coolant pressure
1,500 psi (103 bar)
Coolant flow
60 gpm (227 L/min)
TechniDrill BTA-30bta
Bore range
3 in (76.2 mm)
Max depth
Up to 240 in (6,096 mm) slide travel
Spindles
1
Spindle speed
75 – 1,500 RPM
Spindle power
40 hp (29.8 kW)
Feed
0.1 – 24 in/min (2.5 – 610 mm/min)
CNC control
PC-based touchscreen (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
750 psi (51.7 bar)
Coolant flow
90 gpm (341 L/min)
TechniDrill BTA-40bta
Bore range
4 in (101.6 mm)
Max depth
Up to 240 in (6,096 mm) slide travel
Spindles
1
Spindle speed
150 – 1,500 RPM
Spindle power
50 hp (37.3 kW)
Feed
0.5 – 24 in/min (12.7 – 610 mm/min)
CNC control
PC-based touchscreen (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
600 psi (41.4 bar)
Coolant flow
125 gpm (473 L/min)
TechniDrill BTA-60bta
Bore range
6 in (152 mm) solid / 10 in (254 mm) counter-bore/trepan
Max depth
Up to 240 in (6,096 mm) slide travel
Spindles
1
Spindle speed
50 – 500 RPM
Spindle power
100 hp (74.6 kW)
Feed
0.5 – 24 in/min (12.7 – 610 mm/min)
CNC control
PC-based touchscreen (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
750 psi (51.7 bar)
Coolant flow
300 gpm (1,136 L/min)
TechniDrill BTA-100bta
Bore range
10 in (254 mm)
Max depth
Up to 240 in (6,096 mm) slide travel
Spindles
1
Spindle speed
25 – 1,000 RPM
Spindle power
150 hp (111.9 kW)
Feed
0.5 – 24 in/min (12.7 – 610 mm/min)
CNC control
PC-based touchscreen (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
750 psi (51.7 bar)
Coolant flow
400 gpm (1,514 L/min)
TechniDrill BTA-10 3-Spindlebta
Bore range
1 in (25.4 mm)
Max depth
36 in (914 mm) slide travel
Spindles
3
Spindle speed
750 – 3,000 RPM
Spindle power
15 hp (11.2 kW)
Feed
0.5 – 24 in/min (12.7 – 610 mm/min)
CNC control
PC-based touchscreen (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
750 psi (51.7 bar)
Coolant flow
90 gpm (341 L/min)
TechniDrill BTA-60 3-Axisbta
Bore range
6 in (152 mm)
Max depth
Z = 48 in (1,219 mm) slide travel
Spindles
1
Spindle speed
25 – 1,500 RPM
Spindle power
75 hp (55.9 kW)
Feed
0.5 – 24 in/min (12.7 – 610 mm/min)
CNC control
PC-based touchscreen CNC (Beckhoff Controls, Microsoft Windows OS)
Coolant pressure
750 psi (51.7 bar)
Coolant flow
185 gpm (700 L/min)
BTA Drilling Machine ManufacturersGun Drilling Machine ManufacturersHorizontal Deep Hole Drilling Machine ManufacturersMulti-Spindle Deep Hole Drilling Machine Manufacturers
CERTIFICATION & QUALITY

Certifications & Quality Evidence

Quality evidence

  • All machines are designed and manufactured in-house in the 50,000 sq ft Marshall facility; all sub-assemblies built in-house
  • Solid box ways hardened, ground and hand-scraped to tolerances of ±0.0001 inches
  • Every finished machine goes through an initial testing procedure and can be run through a production runoff
  • 12-month warranty on all new machines and all factory rebuilds
MARKETS

Markets & Reach

Aerospace · Automotive · Agriculture · Energy · Oil & Gas · Plastic Molding · Firearms · Medical Devices

COMMERCIAL

Commercial Terms

Lead timeMachines are built-to-order; delivery time varies with machine design complexity, amount of customization, and in-house order backlog
Warranty12-month warranty on all new machines and all factory rebuilds
After-salesTechnical support and field service for all three brands; remote diagnosis via Beckhoff controls over Ethernet; replacement parts for all DeHoff, Eldorado and TechniDrill models past and present; machine startup assistance and operator/maintenance training; factory rebuild and Beckhoff controls retrofit services
REFERENCE

Reference Customers & Installations

Installed base: Machines in use in 30 countries across 5 continents; DeHoff gun barrel machines used by over 60 firearms companies worldwide

Trade shows

  • September 14–19, 2026 – McCormick Place, Chicago, Illinois
  • January 18–22, 2027 – Venetian Expo + Caesars Forum, Las Vegas, Nevada
CONTACT

Request a Quote

Contact Kays Engineering directly for pricing, specifications and delivery.

Ed Kays — President (Machine Sales)

Emailinfo@kays-dehoff.comPhone660-886-9929Websitehttps://kaysengineering.com
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FAQ

Frequently Asked Questions

How do we select the right machine for our application?

Selection depends on the size and depth of the hole, the material, and your production demand. Contact Kays Engineering to discuss your drilling application and the recommended machine model.

Do you ship internationally?

Yes — Kays Engineering does business with customers all over the world and can assist with all shipping needs, including export licenses if required.

Do you help install the machine?

Once the machine has been delivered, levelled and connected to utilities, Kays Engineering helps with startup of the machine programs and trains operators and maintenance personnel.

Are we able to tour your facility?

Yes — visitors are always welcome to tour the Marshall, Missouri manufacturing facility, located approximately 1.5 hours east of Kansas City.

Independent listing. This supplier directory is maintained by the operator of this site — Dongguan RuidCNC Machine Tools Co., Ltd. — which is listed among the suppliers as the site operator under the same criteria as every other listing. Listings are free unless a supplier chooses a paid Featured placement (always labeled). Inclusion does not constitute an endorsement — verify specifications before purchase.