Couplers, Pin & Block, Mil-Spec
Universal Joints & Steering Shafts: Couplers, Pin & Block U-Joints, and Mil-Spec
103 Couplers are available for direct steering
connections where an angle is not required.
Couplers can also be used to extend the steering
shaft. Overall length is 2” with an outside
diameter of 1” (except FR1942, which is 1-1/4”)
Part No. Description Part No. Description
FR1940 3/4” x 9/16”-26 FR1944 3/4” x 3/4”-30
FR1941 3/4” x 3/4”-36 FR1945 3/4”-D x 3/4”-D
FR1942 3/4”-36 x 3/4”-36 FR1946 3/4” x 3/4”-D
FR1943 3/4” x 5/8”-36 FR1948 3/4” x 11/16”-36
The preferred choice of drag
racers for their sleek and
lightweight design. These are
available in both 1-1/4” and 1”
diameter designs.
Note: For racing applications
only – NOT recommended for
street use. Frequent lubrication
required.
Part
No.
Description O.D.
FR1900 3/4” x 3/4” 1-1/4”
FR1901 3/4” x 9/16”-26 1-1/4”
FR1902 3/4” x 3/4”-36 1-1/4”
FR1903 3/4” x 3/4”-30 1-1/4”
FR1904 3/4” x 5/8”-36 1-1/4”
FR1905 9/16”-26 x 3/4”-36 1-1/4”
FR1906 3/4” x 13/16”-36 1-1/4”
FR1907 5/8”-36 x 7/8” 1-1/4”
FR1820 3/4” x 3/4” 1”
FR1821 3/4” x 9/16”-26 1”
Steering Couplers
FR1948 required for Microsteer Installation
Mil-Specification Universal Joints
Steel Pin & Block Universal Joints
These Universal Joints are similar to military specification
joints for aircraft and have become the select choice of
drag racers due to their lightweight design. A lubricantfilled
silicone boot provides maintenance-free operation
for extended universal joint life. This boot is designed
to operate under high temperature conditions, with a
continuous rating of 650°F. Please note nominal size is
the outside diameter. Not intended for street use.
Part No. Nominal
Size O.D.
O.D. “A”
+.000 -
.002
I.D. “G”
+ .004-
.001
Max Dia.
“J”
+1/64
Length “B”
+/- 1/
Max
“C”
Min
“D”
FR1800B8 1/2” .495 .375 29/32 2-5/16” 5/8” 11/16”
FR1800B10 5/8” .620 .500 1-3/32” 2-3/4” 3/4” 13/16”
FR1800B12 3/4” .745 .625 1-1/32” 3-3/16” 7/8” 15/16”
FR1800B14 7/8” .870 .750 1-1/2” 3-5/8” 1” 1-1/16”
“H”
+/- 1/64
Wt.
(Lbs.)
Min.
Ult.
Static
Torque
(In Lbs.)
Axial
Tension
& Comp.
(Lbs.)
Tensional
Play
Max Degrees
Endurance
torque
Test
(In. Lbs)
FR1800B8 9/16” .079 675 1,000 0.62 90
FR1800B10 11/16 .133 1,200 1,500 0.50 162
FR1800B12 13/16 .212 2,100 2,000 0.42 285
FR1800B14 15/16 .314 3,500 3,500 0.36 450
This is a lightweight
application that is not
designed for circle track,
street or highway use and
not recommended for
steering. Ideal for shifter
linkages. See chart right.
Not For Street Use