Strainsert Co.
12 Union Hill Rd.,West Conshohocken, PA 19428
Phone: 610-825-3310
Fax: 610-825-1734
Toll-free: 800-529-1502
Email: tfoley@strainsert.com
Website: http://www.strainsert.com
All Products > Force Sensing Bolts & Studs > Item # SDH  


Item # SDH, Standard Internally Gaged 12-Point Cap Screws, SDH 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

(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.

For full configuration click Request Information button





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

Output Signal (Nominal)

 View
FB:3.5 mV/V
QB:1.4 mV/V

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

Bridge Resistance

 View
120 Ω
350 Ω (Standard)

Service Temperature
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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