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Item # SXA, Standard Internally Gaged Hex Head Cap Screws, SXA Series



To measure accurate preload, service load and overload of bolted assemblies

For maximum uniformity, efficiency and reliability in bolted assemblies

For effective research, testing and manufacturing of bolted assemblies

Allowable Loads
Allowable loads for Strainsert Hex Head Cap Screws, as tabulated below, are based on approximately 70% Yield Strength of the threads, in pounds.
Load Capacity Lbs.
Screw Dia. Load
1/4-20NC 900
5/16-18NC 1500
3/8-16NC 2200
1/2-13NC 4000
5/8-11NC 6500
3/4-10NC 10000

Each cap screw is calibrated to above indicated load as part of quality control procedure. See calibration section for additional calibration certification.

For full configuration click Request Information button




Specifications  · Performance Specs  · General Information

Specifications

Material
Aluminum Alloy, 2024-T4

Hardness
Rockwell B54 Minimum

Ultimate Tensile Strength
55,000 psi Minimum; 60,000 psi average

Threads
Class 2A, rolled

Thread Length
2-diameters + 1/4 inch full threads + 3/16 inch maximum imperfect threads.

Calibration
Load & Unload Calibration
Load Only Calibration (Standard)


Performance Specs

Gages Type
Metal Foil

Gage Factor (Nominal)
2.00

Non-Linearity
±1% of Allowable Load

Non-Repetition
±0.1% FS

Excitation
350-ohm (Standard) FB: 12V (Maximum)
120-ohm FB: 3V (Maximum)

Output Signal (Nominal)

 View
FB: 3.0 mv/V, approx.

Configuration
Full Bridge Strain Gage Circuit (Standard)

Bridge Resistance (Nominal)

 View
120 Ω
350 Ω (Standard)

Service Temperature
150°F (Standard)
250°F (Max.)


General Information
Strainsert fasteners utilize an exclusive internal gaging method (U.S. Patent #2,873,341) to indicate bolt tension due to preload and subsequent service loads with strain gage accuracy. They are the first fasteners to provide a means for accurate, independent inspection of an assembled bolt for preload, thereby enhancing the structural integrity and reliability of both the bolt and the assembly.


Feature
  • Measurement of preload induced in fasteners
  • Accurate tightening of fasteners within 1% of induced load
  • Uniform tightening of fasteners in a bolt pattern

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     DOWNLOADS 

    Strainsert Force Calibration Service
    (PDF, 407KB)

    Overview and Application of Internally Gaged Force Sensing Fasteners
    (PDF, 454KB)

    Lead Wire and Ordering Information
    (PDF, 65KB)