Unit of Measure


N/A Features of Strainsert Load Sensing Clevis Pins

  • Easy Installation: By replacing pins in Crosby (or Equivalent) wire rope socket, with minimum machining alterations (2-tapped holes), and hardware (2-bolts, keeper plate).
  • Precise Cable Load Sensing: Complete bridge circuit bonded and sealed inside small hole along longitudinal axis of Pin, calibrated in the direction of the applied load.
  • Rugged: Self protecting nature of strain gage installation sealed in small hole, and has proven to be immune to harsh environment.
  • Accuracy: Strainsert Load Sensing Clevis Pins have combined error due to repeatability and non-linearity less than 1% of rated load typically.

    Typical Load Sensing Applications

  • End of Whip Line Winch
  • Clam Shell
  • Boom Pendant Cable Support
  • Crane Hoist Cables
  • Mooring Lines
  • Bridge Support Cables
  • Dead End of Winch Pulley System
    …and any application where load indication on a wire rope clevis is required.

    Custom Pin design performance and specification may vary with design requirements.

    Note: All Load Pins can be fit with a permanently attached cable

    Model SPA-100 (SS)X shown
  • Dimensional Drawing

    Dimensional Drawing

    SPA Clevis Pin


    Wire Rope Diameter

    N/A 3.00–3.13 Inch

    Load Capacity

    N/A 330000 lb

    A - Width of Center Loading Section

    N/A 4-3/16 in

    B - Width of Clevis Support Section

    N/A 2-27/32 in

    C - Length of Pin Reduced Section, Instrumented Zone

    N/A 1-3/16 in

    Dp - Nominal Pin Diameter

    N/A 5.250 in

    E - Active Length of Pin

    N/A 12-1/4 in

    F - Clevis Pin Head Length

    N/A 2.25 in

    G - Extension of Pin for Keeper Plate Installation

    N/A 1-1/2 in

    H - Width of Keeper Plate Slot

    N/A 25/32 in

    J - Depth of Keeper Plate Slot

    N/A 1 in

    L - Overall Length of Pin

    N/A 16 in

    U - Nominal Spacer Thickness

    N/A 1/4 in


    N/A 95.0 lb

    Safety Factor

    N/A 4.0

    Keeper Plates

    N/A SPA-330-112-1-A

    Connector Type

    N/A Axial Connector

    Performance Specs

    Overload without Zero Shift

    N/A 150%

    Overload without Failure

    N/A 300% (Minimum)


    N/A Full bridge 350 Ohm (Nominal)


    N/A 12 V AC (Maximum) 12 V DC (Maximum)
    Output Signal1 N/A 2-mv/V (Nominal)


    N/A ±0.15% FS (Nominal)


    N/A ±0.50% FS (Nominal)


    N/A ±0.50% FS (Nominal)

    Service Temp Range

    N/A to 150 °F

    Temp Effects (on Zero)

    N/A 0.005% FS / °F (Nominal)

    Temp Effects (on Output)

    N/A 0.008% load / °F (Nominal)
    Zero Balance2 N/A ±2% FS (Nominal)


    N/A Stainless Steel 17-4, H-1025 (Standard)

    Electrical Connection

    N/A 6-Pin receptacle or built-in cable


    N/A CAL5-LO

    Electrical Specifications


    N/A PTIH-10-6P

    Mating Plug

    N/A PT06A-10-6S (SR)


    N/A Pin

         (+) Excitation

    N/A A

         (-) Excitation

    N/A D

         (+) Signal

    N/A B

         (-) Signal

    N/A C


    N/A #20(26x34) AWG., rubber insulation, shielded, rubber jacket, 4-Conductor (Standard Cable)


    N/A Wire Code

         (+) Excitation 

    N/A Red

         (-) Excitation 

    N/A Black

         (+) Signal 

    N/A Green

         (-) Signal 

    N/A White

    General Information

    N/A The Load Sensing Clevis Pin or Bolt is another unique strain gage transducer developed by Strainsert (U.S. Patent No. 3,695,096). It utilizes the internal strain gage process perfected by Strainsert over the last 40 years and used so successfully in Strainsert Bolts, and Flat Load Cells®. The Force Sensing Clevis Pin offers precision force measurement by simply replacing existing shear pins, clevis bolts, shear axles, etc. and many other types of pinned joints.

    The internally gaged clevis pin is typically a double-shear arrangement with two shear planes (please see More Images Box - "Clevis Pin with Two Shear Planes"), however, cantilever load pins with a single shear plane are also available.

    Typically, force P is applied at the center of the pin and the pin is supported at each end (P/2) by the Clevis. The strain gages are sealed inside small axial holes and are positioned at two locations at the Clevis to Clevis Eye interfaces. In order to sense only those strains which are induced by the shear forces at these two sections, the gages are positioned and oriented with great precision, at a neutral plane relative to one specific direction of pin force. The four strain gages (two at each location) are electrically connected to form a full bridge, the signal from each gage being additive so that the bridge output is proportional to the sum of the forces transmitted by the shear planes of the pin. The circuit typically includes temperature compensation, signal trim (optional) and balance resistors terminating in a suitable connector socket or integral cable, and potted with a sealing compound inside the gage hole for enhanced environmental protection.

    If the force F is applied to the pin at other than the specified direction, the theoretical bridge output will be due tithe component of the force along the sensitive direction, i.e. F cos X (please see More Images Box - "Force F Direction"). Therefore, typical pins incorporate an anti-rotation device for proper alignment . (see Clevis Pin Installation Download)

    • 1 Exact output provided with calibration data. (Standardized outputs are optional). In addition, Strainsert factory calibrations are intended to simulate installed conditions, however, it is recommended that an in-place calibration be performed to account for any installation, tolerance, and/or alignment influences affecting sensor measurement.
    • 2 Prior to loading, it is necessary to initially/periodically null the zero load output to account for any residual offset.