ASME B18.3 Stainless Steel Flat Head Socket Screws
304 stainless steel inch-series countersunk socket screws with supplier-listed 2A threads. Compare 162 full-thread catalogue references.
Selection notes
Check the complete inch-series size, countersunk head and hexagon socket against your drawing. All source names specify 2A threads; bright-cleaned finish is listed only where stated in the table. Confirm head angle, length measurement and agreed standard edition before ordering. No head angle or performance class is inferred from the catalogue title.
Catalogue specifications
Expand a group to compare the original inch-series size, thread coverage, tolerance class, marking and item reference. Sizes retain the supplier diameter, threads-per-inch and length notation. Availability is confirmed when quoting.
304 stainless steel / 2#-56 — 10 catalogue items
| Catalogue size |
Thread / version |
Marking |
Item reference |
| 2#-56 X 5/32 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
319951 |
| 2#-56X3/16 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339078 |
| 2#-56X1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339079 |
| 2#-56X5/16 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339080 |
| 2#-56X3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339082 |
| 2#-56X1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339083 |
| 2#-56X5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339084 |
| 2#-56X3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339085 |
| 2#-56X7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339086 |
| 2#-56X1" |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339087 |
304 stainless steel / 4#-40 — 18 catalogue items
| Catalogue size |
Thread / version |
Marking |
Item reference |
| 4#-40X3/16 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339088 |
| 4#-40X1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339091 |
| 4#-40X5/16 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339092 |
| 4#-40X3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339093 |
| 4#-40X1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339095 |
| 4#-40X5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339243 |
| 4#-40X3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339255 |
| 4#-40X7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339296 |
| 4#-40X1" |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339303 |
| 4#-40X1-1/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339325 |
| 4#-40X1-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339343 |
| 4#-40X1-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339402 |
| 4#-40X1-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339522 |
| 4#-40X1-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339543 |
| 4#-40X1-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339553 |
| 4#-40X1-7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339555 |
| 4#-40X2" |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339588 |
| 4#-40X7/32 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339089 |
304 stainless steel / 6#-32 — 18 catalogue items
| Catalogue size |
Thread / version |
Marking |
Item reference |
| 6#-32X1/4 |
Full thread; finish not stated; thread class 2A |
Unmarked |
339591 |
| 6#-32X5/16 |
Full thread; finish not stated; thread class 2A |
Unmarked |
339671 |
| 6#-32X3/8 |
Full thread; finish not stated; thread class 2A |
Unmarked |
339675 |
| 6#-32X1/2 |
Full thread; finish not stated; thread class 2A |
Unmarked |
339705 |
| 6#-32X5/8 |
Full thread; finish not stated; thread class 2A |
Unmarked |
339731 |
| 6#-32X3/4 |
Full thread; finish not stated; thread class 2A |
Unmarked |
339761 |
| 6#-32X7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339763 |
| 6#-32X1" |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339764 |
| 6#-32X1-1/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339765 |
| 6#-32X1-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339767 |
| 6#-32X1-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339768 |
| 6#-32X1-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339769 |
| 6#-32X1-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339770 |
| 6#-32X1-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339771 |
| 6#-32X1-7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339772 |
| 6#-32X2" |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339773 |
| 6#-32X2-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339775 |
| 6#-32X2-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339774 |
304 stainless steel / 8#-32 — 22 catalogue items
| Catalogue size |
Thread / version |
Marking |
Item reference |
| 8#-32X1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339776 |
| 8#-32X5/16 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339777 |
| 8#-32X3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339778 |
| 8#-32X1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339779 |
| 8#-32X5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339780 |
| 8#-32X3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339781 |
| 8#-32X7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339782 |
| 8#-32X1 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339783 |
| 8#-32X1-1/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339784 |
| 8#-32X1-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339785 |
| 8#-32X1-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339786 |
| 8#-32X1-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339787 |
| 8#-32X1-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339788 |
| 8#-32X1-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339789 |
| 8#-32X1-7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339790 |
| 8#-32X2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339791 |
| 8#-32X2-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339792 |
| 8#-32X2-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339793 |
| 8#-32X2-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339794 |
| 8#-32X2-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339795 |
| 8#-32X2-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339796 |
| 8#-32X3 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339797 |
304 stainless steel / 10#-24 — 24 catalogue items
| Catalogue size |
Thread / version |
Marking |
Item reference |
| 10#-24X1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339808 |
| 10#-24X5/16 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339809 |
| 10#-24X3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339810 |
| 10#-24X1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339811 |
| 10#-24X5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339812 |
| 10#-24X3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339814 |
| 10#-24X7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339815 |
| 10#-24X1 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339816 |
| 10#-24X1-1/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339817 |
| 10#-24X1-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339818 |
| 10#-24X1-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339819 |
| 10#-24X1-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339820 |
| 10#-24X1-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339822 |
| 10#-24X1-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339823 |
| 10#-24X1-7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339824 |
| 10#-24X2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339825 |
| 10#-24X2-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339826 |
| 10#-24X2-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339827 |
| 10#-24X2-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339828 |
| 10#-24X2-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339829 |
| 10#-24X2-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339830 |
| 10#-24X3 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339847 |
| 10#-24X3-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339848 |
| 10#-24X3-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339850 |
304 stainless steel / 1/4-20 — 25 catalogue items
| Catalogue size |
Thread / version |
Marking |
Item reference |
| 1/4-20X5/16 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339854 |
| 1/4-20X3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339855 |
| 1/4-20X1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339856 |
| 1/4-20X5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339857 |
| 1/4-20X3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339859 |
| 1/4-20X7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339860 |
| 1/4-20X1 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339861 |
| 1/4-20X1-1/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339862 |
| 1/4-20X1-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339863 |
| 1/4-20X1-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339864 |
| 1/4-20X1-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339865 |
| 1/4-20X1-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339866 |
| 1/4-20X1-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339867 |
| 1/4-20X1-7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339868 |
| 1/4-20X2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339869 |
| 1/4-20X2-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339870 |
| 1/4-20X2-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339871 |
| 1/4-20X2-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339872 |
| 1/4-20X2-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339873 |
| 1/4-20X2-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339874 |
| 1/4-20X3 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339875 |
| 1/4-20X3-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339876 |
| 1/4-20X3-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339877 |
| 1/4-20X3-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339878 |
| 1/4-20X4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339879 |
304 stainless steel / 5/16-18 — 23 catalogue items
| Catalogue size |
Thread / version |
Marking |
Item reference |
| 5/16-18X1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339902 |
| 5/16-18X5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339903 |
| 5/16-18X3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339904 |
| 5/16-18X7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339905 |
| 5/16-18X1 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339906 |
| 5/16-18X1-1/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339907 |
| 5/16-18X1-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339908 |
| 5/16-18X1-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339909 |
| 5/16-18X1-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339910 |
| 5/16-18X1-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339911 |
| 5/16-18X1-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339912 |
| 5/16-18X1-7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339913 |
| 5/16-18X2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339914 |
| 5/16-18X2-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339915 |
| 5/16-18X2-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339916 |
| 5/16-18X2-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339917 |
| 5/16-18X2-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339918 |
| 5/16-18X2-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339919 |
| 5/16-18X3 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339920 |
| 5/16-18X3-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339922 |
| 5/16-18X3-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339923 |
| 5/16-18X3-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339924 |
| 5/16-18X4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339925 |
304 stainless steel / 3/8-16 — 22 catalogue items
| Catalogue size |
Thread / version |
Marking |
Item reference |
| 3/8-16X5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339880 |
| 3/8-16X3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339881 |
| 3/8-16X7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339882 |
| 3/8-16X1 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339883 |
| 3/8-16X1-1/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339884 |
| 3/8-16X1-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339885 |
| 3/8-16X1-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339886 |
| 3/8-16X1-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339887 |
| 3/8-16X1-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339888 |
| 3/8-16X1-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339889 |
| 3/8-16X1-7/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339890 |
| 3/8-16X2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339891 |
| 3/8-16X2-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339892 |
| 3/8-16X2-3/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339893 |
| 3/8-16X2-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339894 |
| 3/8-16X2-5/8 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339895 |
| 3/8-16X2-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339896 |
| 3/8-16X3 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339897 |
| 3/8-16X3-1/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339898 |
| 3/8-16X3-1/2 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339899 |
| 3/8-16X3-3/4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339900 |
| 3/8-16X4 |
Full thread; bright cleaned finish; thread class 2A |
Unmarked |
339901 |
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