Load pins are designed into sheave applications for measuring line tension. Sheaves are designed with either a variable or constant wrap angle. For the variable wrap angle case, two strain gage bridges are installed perpendicularly (Px and Py). For the constant wrap angle case, one strain gage bridge is installed along the primary (sensing) axis of force (P).
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sheave-load-pin-variable-angle

Variable Wrap Angle
sheave pin constant wrap angle

Constant Wrap Angle
Applications N/A Crane/Hoist
Line Towing
Line Tensioning
Bridge Composition N/A Full
Bridge Excitation N/A 10 (typical), 12 maximum Vdc
Bridge Resistance N/A 350 (nominal) Ohm
Bridge Sensitivity N/A 0.5 and higher mV/V
Temperature, Zero N/A ±0.01% (nominal) F.S./°F
Temperature, F.S. N/A ±0.01% (nominal) load/°F
Zero Balance N/A ±3.0% (nominal) F.S.
Non-Repeatability N/A ±0.25% (nominal) F.S.
Non-Linearity N/A ±1 % (nominal) F.S.
Hysteresis N/A ±1 % (nominal) F.S.
Safe Overload N/A 150% (typical) F.S.
Ultimate Strength N/A 300% (typical) F.S.
Minimum Pin Diameter N/A 1 (standard), 0.5 (with limitations) inch
Material N/A 17-4 Stainless Steel (typical)
Variable Wrap Angle N/A Variable Wrap Angle
N/A
Constant Wrap Angle N/A N/A Constant Wrap Angle