<P> This number pair is optionally followed by the letters UNC, UNF or UNEF if the diameter - pitch combination is from the coarse, fine, or extra fine series, and may also be followed by a tolerance class . </P> <P> Example: #6 - 32 UNC 2B (major diameter: 0.1380 inch, pitch: 32 tpi) </P> <Table> Unified Screw Threads--UNC, UNF and UNEF <Tr> <Th_colspan="2"> Major diameter (inch \ mm) </Th> <Th_colspan="6"> Thread density (d, threads per inch) and thread pitch (p) </Th> <Th_colspan="3"> Preferred cutting tap drill size </Th> </Tr> <Tr> <Th_colspan="2"> Coarse (UNC) </Th> <Th_colspan="2"> Fine (UNF) </Th> <Th_colspan="2"> Extra fine (UNEF) </Th> </Tr> <Tr> <Th> d (TPI) </Th> <Th> p (inch \ mm) </Th> <Th> d (TPI) </Th> <Th> p (inch \ mm) </Th> <Th> d (TPI) </Th> <Th> p (inch \ mm) </Th> <Th> Coarse </Th> <Th> Fine </Th> <Th> Extra fine </Th> </Tr> <Tr> <Td> #0 </Td> <Td> 0.0600 \ 1.5240 </Td> <Td_colspan="2"> None </Td> <Td> 80 </Td> <Td> 0.012500 \ 0.3175 </Td> <Td_colspan="2"> None </Td> <Td> </Td> <Td> ​ ⁄ in </Td> <Td> </Td> </Tr> <Tr> <Td> #1 </Td> <Td> 0.0730 \ 1.8542 </Td> <Td> 64 </Td> <Td> 0.015625 \ 0.3969 </Td> <Td> 72 </Td> <Td> 0.013888 \ 0.3528 </Td> <Td_colspan="2"> None </Td> <Td> #53 </Td> <Td> #53 </Td> <Td> </Td> </Tr> <Tr> <Td> #2 </Td> <Td> 0.0860 \ 2.1844 </Td> <Td> 56 </Td> <Td> 0.017857 \ 0.4536 </Td> <Td> 64 </Td> <Td> 0.015625 \ 0.3969 </Td> <Td_colspan="2"> None </Td> <Td> #50 </Td> <Td> #50 </Td> <Td> </Td> </Tr> <Tr> <Td> #3 </Td> <Td> 0.0990 \ 2.5146 </Td> <Td> 48 </Td> <Td> 0.020833 \ 0.5292 </Td> <Td> 56 </Td> <Td> 0.017857 \ 0.4536 </Td> <Td_colspan="2"> None </Td> <Td> #47 </Td> <Td> #45 </Td> <Td> </Td> </Tr> <Tr> <Td> #4 </Td> <Td> 0.1120 \ 2.8448 </Td> <Td> 40 </Td> <Td> 0.025000 \ 0.6350 </Td> <Td> 48 </Td> <Td> 0.020833 \ 0.5292 </Td> <Td_colspan="2"> None </Td> <Td> #43 </Td> <Td> #42 </Td> <Td> </Td> </Tr> <Tr> <Td> #5 </Td> <Td> 0.1250 \ 3.1750 </Td> <Td> 40 </Td> <Td> 0.025000 \ 0.6350 </Td> <Td> 44 </Td> <Td> 0.022727 \ 0.5773 </Td> <Td_colspan="2"> None </Td> <Td> #38 </Td> <Td> #37 </Td> <Td> </Td> </Tr> <Tr> <Td> #6 </Td> <Td> 0.1380 \ 3.5052 </Td> <Td> 32 </Td> <Td> 0.031250 \ 0.7938 </Td> <Td> 40 </Td> <Td> 0.025000 \ 0.6350 </Td> <Td_colspan="2"> None </Td> <Td> #36 </Td> <Td> #33 </Td> <Td> </Td> </Tr> <Tr> <Td> #8 </Td> <Td> 0.1640 \ 4.1656 </Td> <Td> 32 </Td> <Td> 0.031250 \ 0.7938 </Td> <Td> 36 </Td> <Td> 0.027778 \ 0.7056 </Td> <Td_colspan="2"> None </Td> <Td> #29 </Td> <Td> #29 </Td> <Td> </Td> </Tr> <Tr> <Td> #10 </Td> <Td> 0.1900 \ 4.8260 </Td> <Td> 24 </Td> <Td> 0.041667 \ 1.0583 </Td> <Td> 32 </Td> <Td> 0.031250 \ 0.7938 </Td> <Td_colspan="2"> None </Td> <Td> #25 </Td> <Td> #21 </Td> <Td> </Td> </Tr> <Tr> <Td> #12 </Td> <Td> 0.2160 \ 5.4864 </Td> <Td> 24 </Td> <Td> 0.041667 \ 1.0583 </Td> <Td> 28 </Td> <Td> 0.035714 \ 0.9071 </Td> <Td> 32 </Td> <Td> 0.031250 \ 0.7938 </Td> <Td> #16 </Td> <Td> #14 </Td> <Td> ​ ⁄ in </Td> </Tr> <Tr> <Td> ​ ⁄ </Td> <Td> 0.2500 \ 6.3500 </Td> <Td> 20 </Td> <Td> 0.050000 \ 1.2700 </Td> <Td> 28 </Td> <Td> 0.035714 \ 0.9071 </Td> <Td> 32 </Td> <Td> 0.031250 \ 0.7938 </Td> <Td> #7 </Td> <Td> #3 </Td> <Td> ​ ⁄ in </Td> </Tr> <Tr> <Td> ​ ⁄ </Td> <Td> 0.3125 \ 7.9375 </Td> <Td> 18 </Td> <Td> 0.055556 \ 1.4111 </Td> <Td> 24 </Td> <Td> 0.041667 \ 1.0583 </Td> <Td> 32 </Td> <Td> 0.031250 \ 0.7938 </Td> <Td> </Td> <Td> </Td> <Td> ​ ⁄ in </Td> </Tr> <Tr> <Td> ​ ⁄ </Td> <Td> 0.3750 \ 9.5250 </Td> <Td> 16 </Td> <Td> 0.062500 \ 1.5875 </Td> <Td> 24 </Td> <Td> 0.041667 \ 1.0583 </Td> <Td> 32 </Td> <Td> 0.031250 \ 0.7938 </Td> <Td> ​ ⁄ in </Td> <Td> Q </Td> <Td> ​ ⁄ in </Td> </Tr> <Tr> <Td> ​ ⁄ </Td> <Td> 0.4375 \ 11.1125 </Td> <Td> 14 </Td> <Td> 0.071428 \ 1.8143 </Td> <Td> 20 </Td> <Td> 0.050000 \ 1.2700 </Td> <Td> 28 </Td> <Td> 0.035714 \ 0.9071 </Td> <Td> U </Td> <Td> ​ ⁄ in </Td> <Td> Y </Td> </Tr> <Tr> <Td> ​ ⁄ </Td> <Td> 0.5000 \ 12.7000 </Td> <Td> 13 </Td> <Td> 0.076923 \ 1.9538 </Td> <Td> 20 </Td> <Td> 0.050000 \ 1.2700 </Td> <Td> 28 </Td> <Td> 0.035714 \ 0.9071 </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> </Tr> <Tr> <Td> ​ ⁄ </Td> <Td> 0.5625 \ 14.2875 </Td> <Td> 12 </Td> <Td> 0.083333 \ 2.1167 </Td> <Td> 18 </Td> <Td> 0.055556 \ 1.4111 </Td> <Td> 24 </Td> <Td> 0.041667 \ 1.0583 </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> </Tr> <Tr> <Td> ​ ⁄ </Td> <Td> 0.6250 \ 15.8750 </Td> <Td> 11 </Td> <Td> 0.090909 \ 2.3091 </Td> <Td> 18 </Td> <Td> 0.055556 \ 1.4111 </Td> <Td> 24 </Td> <Td> 0.041667 \ 1.0583 </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> </Tr> <Tr> <Td> ​ ⁄ </Td> <Td> 0.7500 \ 19.0500 </Td> <Td> 10 </Td> <Td> 0.100000 \ 2.5400 </Td> <Td> 16 </Td> <Td> 0.062500 \ 1.5875 </Td> <Td> 20 </Td> <Td> 0.050000 \ 1.2700 </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> </Tr> <Tr> <Td> ​ ⁄ </Td> <Td> 0.8750 \ 22.2250 </Td> <Td> 9 </Td> <Td> 0.111111 \ 2.8222 </Td> <Td> 14 </Td> <Td> 0.071428 \ 1.8143 </Td> <Td> 20 </Td> <Td> 0.050000 \ 1.2700 </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> </Tr> <Tr> <Td> </Td> <Td> 1.0000 \ 25.4000 </Td> <Td> 8 </Td> <Td> 0.125000 \ 3.1750 </Td> <Td> 12 (*) </Td> <Td> 0.083333 \ 2.1167 </Td> <Td> 20 </Td> <Td> 0.050000 \ 1.2700 </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> <Td> ​ ⁄ in </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Major diameter (inch \ mm) </Th> <Th_colspan="6"> Thread density (d, threads per inch) and thread pitch (p) </Th> <Th_colspan="3"> Preferred cutting tap drill size </Th> </Tr>

What size is a #8 screw in inches
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