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Test Methods for Screws

Test method standards for fasteners cover test procedures for screws and nuts, gauging their performance under the conditions they are intended for. Test procedures are available for both inch and metric series fasteners. This list contains standards from IFI on test methods for screws.

IFI-166:2007

Inspection Procedure for Thread Nicks - Inch Series

This standard establishes an inspection procedure to determine acceptability of thread nicks as they relate to screw thread assemblability. This procedure is intended to be used for bolts, screws and studs of carbon or alloy steel #10 thru 1¬ inch in diameter. This procedure applies to Unified coarse and fine, Class 2A threads, plain finish and Class 2A threads that have been plated or coated. This procedure may also be used to evaluate Class 2A threads that have been undersized to allow for heavy plating/coating thickness and products made from nonferrous materials.

IFI-154:2005

A Standard Test Procedure for Qualification of Anti-Cross Threading Screws

This standard covers a test procedure to qualify inch series screws which have an anti-cross thread feature intended to facilitate the free assembly with the mating internal thread in assembly applications.

IFI-124:2002

Test Procedures for the Performance of Nonmetallic Resistant Element Prevailing-Torque Screws

This standard establishes a conformance test procedure for the performance of Nonmetallic Resistant Element Prevailing-Torque Screws (REPT screws), in nominal screw sizes No. 0 thru 1½ in.

IFI-125:2007

Test Procedure for the Performance of Chemical Coated Prevailing-Torque Screws

This standard establishes a conformance test procedure for the performance of adhesive coated prevailing-torque screws, in nominal screw sizes No. 4 thru 3/4 in. Torque values given in this standard are conformance requirements for adhesive coated prevailingtorque screws and apply only to the combination of test conditions described in the performance test procedure (Para. 5.1). If the conditions of the actual service application differ from those of Para. 5.1 (e.g., length of thread engagement, class of internal thread tolerance, different coating on screw or mating part) the torque values may differ. Such values can only be determined through testing the prevailing-torque screw in its actual assembly. This standard is not concerned with dimensional features such as head styles, or with other mechanical or performance capabilities such as strength properties, corrosion resistance, sealing, suitability for use in high or low temperatures, and/or consistency of torque-to-tension relationships during assembly. Such features and properties are covered in other standards and specifications, and must be referenced when specifying an adhesive coated prevailing-torque screw to ensure that all of the service conditions of the particular engineering application are properly met.

IFI-524:2002

Test Procedure for the Performance of Metric Nonmetallic Resistant Element Prevailing-Torque Screws

This standard establishes a conformance test procedure for the performance of metric Nonmetallic Resistant Element Prevailing-Torque Screws in nominal thread diameters M1.6 thru M36.

IFI-525:2007

Test Procedure for the Prevailing-Torque Performance of Metric Chemical Coated Screws

This standard establishes a conformance test procedure for the performance of metric adhesive coated prevailing-torque screws in nominal thread diameters M3 thru M20 inclusive. Torque values given in this standard are conformance requirements for adhesive coated prevailing- torque screws and apply only to the combination of test conditions described in the performance test procedure (Para. 5.1). If the conditions of the actual service application differ from those of Para. 5.1 (e.g., length of thread engagement, class of internal thread tolerance, different coating on screw or mating part) the torque values may differ. Such values can only be determined through testing the prevailingtorque screw in its actual assembly. This standard is not concerned with dimensional features such as head styles, or with other mechanical or performance capabilities such as strength properties, corrosion resistance, sealing, suitability for use in high or low temperatures, and/or consistency of torque-to-tension relationships during assembly. Such features and properties are covered in other standards and specifications, and must be referenced when specifying an adhesive coated prevailing- torque screw to ensure that all of the service conditions of the particular engineering application are properly met.

IFI-554:2005

A Standard Test Procedure for Qualification of Anti-Cross Threading Screws

This standard covers a test procedure to qualify metric series screws which have an anti-cross thread feature intended to facilitate the free assembly with the mating internal thread in assembly applications.

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