Oster 784

Oster 784 - Factory Floor 4” Capacity Pipe and Bolt Threading Machine

Standard Pipe Range 3/8" to 4"
Extra Pipe Range* 1/4"
Standard Bolt Range 1/2" to 3"
Extra Bolt Range* 3/8" to 11/16"

General Specifications
Spindle Speeds, Variable 16-23-35-51
Carriage Travel 15"
Length 5' 9"
Width 3' 5"
Height 4' 4"
Net Weight 1950 lbs.
Shipping Weight 2300 lbs.

The Most Versatile & Rugged 4” Pipe Threading Machine You will Encounter

This machine is designed and built as a 4" capacity Threading Machine. It is not an oversize version of a 2" machine. It's quality construction, versatility, and outstanding performance in the shop or on the job have long made it the Standard of the Industry. Used for applications where production quantities, work size, or thread quality are the primary consideration.

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Cut-Off, Reaming & Chamfering

The Lathe type Cut-Off and Chamfer Tools are cross rail mounted on the back of the Die Head. The easy operating Reamer is of the swing type.

784 Chamfer Cut

Lever Operated Dieheads that Cover the Entire Pipe and Bolt Range

Two quick-opening, removable, lever operated die heads cover the entire pipe and bolt range. Both have a positive locking device and means for adjusting all dies simultaneously for over or undersize threads. Quick, easy die change from one size to another makes them particularly desirable where a variety of sizes are to be threaded.

Quad Head Slide

The No. 784 is equipped with one No. 03852 quick-opening die head with one set of Symbol QUAD high speed steel pipe dies for 1" thru 2" plus the No. 03590 Die Head and a single set of symbol 74 high speed steel pipe dies to thread all sizes 2.5" thru 4".

Oster 74 Diehead

Motor Control for Threading Machines

Magnetic starter and push button station with REVERSING control. A JOG - RUN selector switch allows a means for jogging the spindle to facilitate shifting gears. 230/460V input is converted to 120V at the machine control for the operator's safety.

784 Headstock

Motor Mount & Transmission

Motor is mounted on an adjustable plate, driving through three "V" belts which, in turn, drive a selective gear-type transmission. The "V" belts cushion shocks and make for quiet, smooth operation. All shafts are ball bearing mounted.

784 Motor Mount

Accessories for the Oster 784 Threading Machine

Victaulic Type Grooving Tool Attachment

These Tools automatically insure correct depth, width and distance from pipe end for Victaulic Grooving applications. Available as extra equipment with the No. 784 Machine.

784 Carriage Victaulic

Rear Gripping Chuck

No. 02969 replaces rear centering chuck, wrenchless - three flange jaws - universal gripping.

Additional Accessories for the Oster 784 Threading Machine

No. 200 Nipple Chuck, No. 4 Nipple Chuck

Standard Equipment Furnished

  • Dieheads - Two die heads. One for sizes up to 2", and the other for sizes 2-1/2" to 4".
  • Dies - Two sets to cover standard pipe range, 1" thru 4". RIGHT Hand Only. ONE set high speed steel Symbol QUAD Dies (1" thru 2") and one set high speed steel Symbol 74 Dies (to thread all sizes 2-1/2" thru 4"). Left Hand Thread can also be produced using optional Die Head and Dies.
  • Reamer - Swing-type.
  • Cutter - Lathe style, blade type cut-off tool with double V block centering device.
  • Chamfer Tool - Mounted in cut-off block.
  • Front Chuck - Wrenchless, three-jaw, universal gripping.
  • Rear Centering Chuck - Wrenchless, three-jaw, universal centering.
  • Motor - 5hp., 1800 rpm., 3 phase, 60 Hz. 230 or 460 volts. (Motors of other specifications available.)
  • Motor Control - REVERSING magnetic starter and push button station, with safety 120V control circuit at motor controls.
  • Gage - Direct reading DRUM type, mounted on carriage hand wheel.
  • Oil Pump - "V" Belt driven, by drive motor.
  • Oil - Thread cutting, TEN gallons-Oster "BESTOIL".

Watch a Video of the Oster 784 Threading Machine

oster 784 video

Custom Applications or Technical Questions – Oster is here for you!

When you call Oster Manufacturing there is always a human being on the other end of the line. We have skilled technical and sales experts on hand to take your call. If you’re interested in a machine or tooling for a non-standard threading application we are happy to consult with you on the project and come up with custom engineered solutions to make your project idea a reality. We can make a variety of custom tooling for special projects and keep them in stock for you so you never have to wait when it comes to a difficult project.

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