Pneumatic Stroke • Self Feeding

The Model 350 drill unit is a self feeding drill which can be actuated with air or oil. It is capable of producing thrusts of up to 415 lbs with 100 psi air pressure and 624 lbs with 150 psi oil pressure. The unit is usually used for drilling, reaming, boring and light milling applications, but can also be used whenever simultaneous rotary and linear motions are required. It can be mounted in any position, horizontal, vertical, etc. As illustrated it is supplied without a motor, but can be easily powered by an electric or air motor up to 1 1/2 hp. A simple pneumatic or hydraulic control system is required to achieve forward and reverse stroke control. This can be purchased separately from Blackalloy.

The stroke length of all Model 350 drill units can be controlled by a stop screw dial and nut which is fully adjustable from zero to the entire stroke range as ordered. (1 1/2", 3", 6" or special stroke lengths) Depth control is achieved to within about .001 to .002 inch.

Blackalloy™ Series 350™ Drill Units With Standard Spindles & Bearings

Model #350-1.5 #33JT with Key Chuck

  • Spindle Projections; #33JT, 5/8-16, 3/4-16 Thread, 10mm (.3937") O.D.
  • Drilling Capacities; 5/8" Steel, 1" Aluminum, Wood, Plastics
  • 6,000 RPM; Max. Recommended HP 2

Model Stroke Inch A B

Weight LBS

350-1.5 1.5 4.75 6.475 13
350-3 3 6.25 7.975 15
350-6 6 9.25 10.975 18
350-8 8 11.25 12.975 20
Dimensions in Inches

Blackalloy Series 352™ Drill Units With Feed Control Cylinder
Includes Compact Sealed Oil Cylinder Feed Control

Model 250-15

Drill Units With Feed Controls Provide Accurate Feed Rates For Precision Applications.

This degree of accuracy is not always possible with pneumatic reciprocation alone where the compressibility of air allows for variations in feed rates with changes in thrust load, particularly when breaking through a hole.

  • Compact Sealed Oil Cylinder -- Low Cost
  • Simple Cylinder Plunger Depression to Actuate Feed Control
  • Drill Stroke Cycle -- 1/2", 1", 2", 3", 4" & 6"
  • Adjustable Positioning Produces Rapid Advance Which Saves Cycle Time
  • Suitable for Applications Requiring Forward Feed Control
  • Right, Left or Top Mounted Feed Controls Available for Maximum Application Flexibility
  • Minimum Feed Rate 0.2 In./Min.
  • Maximum Feed Rate 240 In./Min.


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Blackalloy Company of America • 4773 Northgate Blvd. • Myrtle Beach, SC 29577

Tel: (843) 347-3390 • Fax: (843)293-0851

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