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The Type 3 (Spacer Type) arrangement is specifically designed for the pump industry and is available in a variety of industry standard shaft separations. The shaft center spacer drops out to facilitate easier maintenance of pump parts without disturbing the alignment of pump and motor. Spacer type couplings utilize either standard delta hubs or optional round hubs. The center member of the Deltaflex is captured by the construction of the spacer flanges for greater safety. Standard spacer drop out lengths are available to accommodate shaft separations of 3.50, 4.38, 5, 7, 10, 12 and 15 inches. Special spacer lengths and stainless steel spacer couplings are available as an option.

The Type 4 (Floating Shaft) coupling components are identical to Type 3, except the floating shaft design uses a longer spacer tube to span distances up to 12 feet. Deltaflex floating shaft couplings are lightweight, dynamically balanced (as required) and corrosion resistant. The center member of the Deltaflex is captured by the construction of the spacer flanges for greater safety. Floating shaft couplings are also available in stainless steel.

Type 3 & 4 Deltaflex couplings are comprised of two hubs, two spacer flanges (with hardware), and a dropout spacer.

Unit of Measure





N/A Flex-Link


N/A Stainless Steel

Hub Style

N/A Delta


N/A Metallic


N/A 6.70 lb

Dimensional Data


N/A 80HT

Set Screw Thread Size (Dimension T)

N/A 1/2-13

Keyway Size (W x D)

N/A No Keyway

Outside Diameter

N/A 9.620 in

Min. Bore (Dimensions ID1/ID2)

N/A 1.375 in35 mm

Max. Bore (Dimensions ID1/ID2)

N/A 3.375 in86.00 mm

Dimension BC

N/A 5.120 in130.05 mm

Dimension L

N/A 1.000 in25.40 mm

Dimension P

N/A 3.498 to 3.500 in88.849 to 88.900 mm

Dimension Q

N/A 0.120 in3.05 mm

Dimension R

N/A 1.000 in25.40 mm

Dimension TH (Axial Cap / Screw Tap)

N/A 1/2-13 x 1.00 in

Cubic inches

N/A 92.54440 in³

Performance Data

Max. Continuous Torque

N/A 15000.00 in·lb

Peak Overload Torque

N/A 22500.00 in·lb

Max. Parallel Misalignment at Max. Span at 1,750 rpm

N/A 3.500 in

Max. Span (Both Ends) at 875 rpm

N/A 140.000 in

Max. Span (Both Ends) at 1,150 rpm

N/A 115.000 in

Max. Span (Both Ends) at 1,750 rpm

N/A 94.000 in

Rated HP at 100 rpm

N/A 23.80 hp

Rated HP at 875 rpm (Standard Motor)

N/A 208.00 hp

Rated HP at 1,150 rpm (Standard Motor)

N/A 274.00 hp

Rated HP at 1,750 rpm (Standard Motor)

N/A 416.00 hp

Rated HP at 3,500 rpm (Standard Motor)

N/A 832.00 hp

Coupling Design

Coupling Design

    The Deltaflex coupling is the real solution to installation, misalignment, and performance problems. Conventional couplings – even when carefully aligned to the manufacturer’s specifications – cannot match the low level of vibration, moment of inertia, and additional cushion for future misalignment of a visually aligned Deltaflex coupling.
    In addition, the Deltaflex coupling gives longer life to equipment shaft bearings. That means longer operating time and reduced maintenance cost. The Deltaflex can handle greater shaft misalignment without generating heavy reaction loads on the equipment shaft bearings.
    A properly applied and installed Deltaflex coupling offers more equipment protection compared to conventional couplings.



  • Maximum misalignment capabilities, with negligible reactionary load, for longer equipment bearing life
  • Operates as smoothly when misaligned as when perfectly aligned
  • No lubrication and no maintenance required
  • Equipment can be visually aligned. No special tools are required, which saves on installation time and cost
  • Eliminates premature equipment bearing and seal failure resulting from misalignment forces. This means greater equipment productivity
  • Torsionally stiff coupling with no backlash means it is capable of high speed applications, within catalog ratings
  • Provides long-term performance and economy
  • Available in 5 basic sizes, from 10HP to 900HP
  • Standard all-metal and stainless steel versions are both available from stock
  • Many configurations are available, including shaft-to-shaft, spacer, floating shaft, and special assemblies



  • Size 50: In some bore sizes the tap is 5/8-18.
  • Maximum bores are provided with standard keyway.
  • RSB hubs do not have a keyway.
  • Both Delta hubs and Round hubs are provided with two set screws at 120°.
  • Minimum bore hubs are furnished with 2 set screws at 120°, No Keyway.
  • S is the Spacer drop out or floating shaft length, S = BE-2(R).
  • LTB is the length through the hub bore. OAL is the overall length, OAL = BE + 2(LTB).
  • BE is the distance between the ends of equipment shafts—please supply this dimension when placing orders, BE = OAL-2 (LTB), BE = S + 2 (R), BE < 18 inch = Spacer coupling (Type 3); BE > 18 inch = Floating Shaft coupling (Type 4). ED
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