Strainsert Co. - Item # SDH, Standard Internally Gaged 12-Point Cap Screws, SDH Series

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STRAINSERT….
     FOR SUPERIOR INTERNALLY GAGED FORCE TRANSDUCERS
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Item # SDH Standard Internally Gaged 12-Point Cap Screws, SDH Series


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SDX

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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

(Ferry Cap Counter-Bored Screws interchangeable with most Socket Head Cap Screws)

Allowable Loads
Allowable loads for Strainsert 12-Point Cap Screws, as tabulated below, are based on approximately 70% Yield Strength of the threads, in pounds.
Load Capacity Lbs.
Screw Dia. Fine Threads Coarse Threads
1/4 2700 2700
5/16 5400 4800
3/8 8200 7200
7/16 11000 10000
1/2 15000 14000
5/8 25000 22000
3/4 36000 32000
7/8 50000 44000
1 67000 59000
1-1/8 - 74000
1-1/4 - 92000
1-1/2 - 136000

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

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Specifications · Performance Specs · General Information

Specifications

Material

Steel Alloy, SAE 4140

Hardness

Rockwell C37 to C43

Ultimate Tensile Strength

170,000 psi Minimum

Threads

Class 3A, rolled to 1” dia.; Class 2A, rolled 1-1/8” dia. & larger.

Finish

Black Satin Finish

Calibration

Load Only Calibration (Standard)
Load & Unload Calibration

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)
350-ohm (Standard) QB: 6V (Maximum)
120-ohm FB: 3V (Maximum)

Output Signal (Nominal)

 Question? 		FB:3.5 mV/V
QB:1.4 mV/V

Configuration

Full Bridge Strain Gage Circuit (Standard)
Quarter Bridge Strain Gage Circuit

Bridge Resistance

 Question? 		350 Ω (Standard)
120 Ω

Bridge Resistance (Nominal)

150°F (Standard)
300°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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    width= Strainsert Force Calibration Service
    (PDF, 407KB)

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

    width= Lead Wire and Ordering Information
    (PDF, 65KB)

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