J2271_200901 Ship Systems and Equipment—Part Standard for Studs—Continuous and Double End (Inch Series)
Revised
01/23/2009
- Features
- Issuing Committee
- Content
- This SAE Parts Standard provides dimensional and quality assurance requirements for studs in the following configurations in standard materials used for ship system applications:
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a
Continuous thread studs in UNRC and 8UNR series in the following threads and diameters:
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UNRC threads (0.190 through 4 inches)
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UNRF threads (0.190 through 1-1/2 inches)
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8UNR threads (1-1/8 through 4 inches)
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b
Double end studs (clamping type) where both ends are of the same thread length in the following threads and diameters:
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UNRC threads (1/4 through 4 inches)
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UNRF threads (1/4 through 1-1/2 inches)
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8UNR threads (1-1/8 through 4 inches)
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c
Double end studs (tap end type) where the tap end thread length is equivalent to 1-1/2 nominal diameters:
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NC-5 interference-fit tap end thread with UNRC, UNRF or 8UN nut end threads (1/4 through 1-1/2 inches)
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UNRC and 8 UN threads both ends (1/4 through 4 inches)
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UNRC threads both ends (1/4 through 1-1/2 inches)
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-
a
- Content
- Configuration changes include:
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Added UNRF thread configurations for diameters 0.190 inch to 1-1/2 inches. Expanded the size (diameter) range of UNRC and 8UN studs.
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Added NC-5 HF and NC-5 CSF interference threads for use where a larger diameter is required for interference fit in an oversize tapped hole. Added ONF interference fit threads in Appendix B.
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The constant strength (undersize) stud body has been deleted in favor of the more commonly used reduced diameter body. Added Full Diameter Body configuration.
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The tap end thread length dimensions have been revised to minimize variations in thread length.
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Due to configuration changes, the Part Identification Number System has been revised and all part numbers are different from earlier revisions.
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Added Appendix A to provide guidance on the selection and installation of NC-5 Interference-Fit Tap End Studs.
Materials added and other material changes are:-
Titanium alloy 32 (Ti-5-1-1-1) to ASTM F 468.
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Ni-Cr-Mo-Cb (UNS N06625) to ASTM F 468 for high temperature and seawater applications.
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Ni-Cr-Mo-W alloy (UNS N06686) to ASTM F 468.
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Stainless steel B8 and B8M to ASTM A 193.
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Stainless steel 300 series per ASTM F 593 Group 1.
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Carbon Steel Grade B per ASTM A 307.
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Carbon and Alloy Steels - SAE J429 Grades 2, 5 and 8 (Grade 5 replaces ASTM A 449 Type 1 and Grade 8 replaces ASTM A 354 Grade BD for diameters of 1-1/2 inches and less).
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Added note comparing titanium materials and on material selection to minimize galling.
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The Part Identification Number Field for materials was expanded to two characters for all materials.
Changes in coating materials:-
MIL-L-46010 deleted for dry film coatings.
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Adding marking requirements for use of coated B7 material per ASTM A 193.
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Added Zinc/Aluminum Inorganic coatings per ASTM F 1136.
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Substituted ASTM F 1941 for ASTM B 633 and ASTM B 695 for zinc coating requirements.
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Identified recommended coatings for each stud material.
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Added a designator for coatings not covered by SAE J2271.
Changes in Quality Assurance requirements:-
Identified sampling levels for tests and inspections.
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Added ASTM F 788/F 788M and SAE J1061 as references for surface defects inspection.
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Changed primary inspection method for decarburization/carburization to ASTM F 2328
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Deleted several supplementary inspections for ASTM A 193 materials.
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- Pages
- 31
- Citation
- SAE International Technical Standard, Ship Systems and Equipment—Part Standard for Studs—Continuous and Double End (Inch Series), SAE Standard J2271_200901, Revised January 2009, Issued June 1996, https://doi.org/10.4271/J2271_200901.