Spiral Washers

Spiral Washers


frames, MTS 601.11 Spiral Washers
can be used anywhere a backlashfree,
threaded union is required.
These versatile accessories prevent
backlash in threaded unions
during through-zero cyclic loading.
This is accomplished by preloading
the stud to a tensile force
slightly higher than the required
test load, then tightening the spiral
washers. When the preload is
removed, the stud remains in
tensile load and the components
in compressive load throughout
the test.
B E N E F I T S
Backlash-Free Joints
Use these spiral washers anywhere
you need a backlashfree
connection for throughzero
loading.
Protects Your Joints From
Fatigue
With these spiral washers, you
take the cyclic load out of the
stud.
Wide Temperature Range
Use from –200 to +350°F (–129
to +177°C).
O P T I O N S
Shims
For rotationally aligning your
fixture to your load frame:
0.004 in (0.10 mm) thick for
5 Kip (25 KN) spiral washers.
0.006 in (0.15 mm) thick for
22 Kip (100 KN) washers.
0.006 in (0.15 mm) thick for
55 Kip (250 KN) washers.
Spanner Wrenches
For adjusting spiral washers
(two required).
Specify spanner pin diameter
(see chart).
S P E C I F I C A T I O N S
Model Force Dimensions Spanner Part
Number Rating A B C Pin Dia. Number
601.11A-20 5.5 kip 1.62 in 0.82 in 1/2-20 0.19 in 40-473-119
601.11B-20 25 kN 41 mm 21 mm M12 x 1.25 4.8 mm 40-473-120
601.11A-11 22 kip 2.62 in 1 in 1-14 0.25 in 40-473-101
601.11B-11 100 kN 66 mm 25 mm M27 x 2 6.8 mm 40-473-110
601.11A-19 55 kip 3.62 in 1.25 in 11/2-12 0.25 in 40-473-102
601.11B-19 250 kN 92 mm 32 mm M36 x 2 6.8 mm 40-473-111
601.11A-13 110 kip 5.12 in 1.25 in 2-12 0.25 in 40-473-104
601.11B-13 500 kN 130 mm 32 mm M52 x 2 6.8 mm 40-473-113
601.11A-15 220 kip 7 in 1.75 in 3-12 0.38 in 40-473-106
601.11B-15 1000 kN 178 mm 44 mm M76 x 2 9.5 mm 40-473-115
spiral washers is much greater than
the cross-sectional area of the stud,
most of the fatigue loading during
testing is absorbed by the washers in
compression, rather than by the stud
in tension. As a result, these spiral
washers also extend the life of the
stud and the threads in your actuator,
load cell or other components.
MTS also provides shims, sold
separately, for rotational alignment
of your fixtures. These can be used
to reorient your fixtures if they no
longer face forward when the spiral
washers are tightened.