How You Use SR1
First, SR1 calculates and suggests different combinations of bolt diameters and strength classes based on your preliminary input of the amount and type of load, its application, and the tightening method.

Database for Bolts and Threads
Next, you use SR1 to define the bolt and nut. SR1 contains extensive databases for bolts, nuts, and thread sizes and types. The standard databases include information for most commonly used metric and English bolt type and dimensions, ranging from M1.6 to M160, and from 0-80 to 4-inch by 4. You can append the databases with specially sized fasteners and define any number of bolt types. Tightening factor and tool precision discrepancies are also available from an appendage database.

Clamping Parts
Third, you can freely define the dimensions, material, e-Modulus, and permissible surface pressure for up to ten clamping pieces. The materials database can be appended to include additional materials and associated factors to meet your needs. Experienced users can create special effects with clamping pieces to modify the SR1 deflection calculations and supplement FEA calculations and torque-angle signature measurements.

Friction Coefficients
Next, you enter the friction coefficients, either from the database or as derived from experimental testing. The most important friction coefficients for thread, head seat, and seam are available for use from the integrated SR1 database. You can append the friction coefficient database to include new combinations of materials based on data determined experimentally. Such testing can be done using fastener research test machines that perform tests according to DIN 946, such as the RS Technologies LabMaster Model 9504. The slope of the torque-angle signature for a given bolted joint can then be used to verify the uniformity of friction effects.

Assembly Method
Finally, you specify the scatter factor of the assembly process. Certain types of tooling can introduce a greater amount of scatter than others. The amount of scatter relating to tooling is an important factor when analyzing a critical bolted joint and SR1 makes it easy for you to setup and append the related database.

• SR1 Data Outputs
• SR1 Demo
• Additional Information

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