Side
af
764
Forrige
Næste
419 OF ENGINEERING FORMULÆ.
Whitwokth’s Standard for Screws with Angular
Threads.
No. of Threads per inch. 1 I Old Sizes, inches. New Standard, decimals of an inch. 11. 11 0 s I £ • Old Sizes, inches. New Standard, decimals of an inch. No. of Threads lær inch. Old Sizes, inches. New Standard, decimals of an inch.
48 •100 12 •600 4 2f 2-375
40 J •125 11 f •625 4 2! 2-500
32 •150 11 •650 4 24 2-625
24 •175 11 •675 3i 24 2-750
24 •200 11 •700 3i 2J 2-875
24 •225 10 4 •750 3| 3 3-000
20 i •250 I 10 •800 31 3* 3-25
20 ■275 9 •875 1 31 31 3-50
18 •300 । 9 •900 3 3f 3-75
18 •325 8 1 1-000 3 4 4-00
18 ■350 1 1-125 I 2i 4i 4-25 1
16 •375 1 U 1-250 2J 4i 4-50
IB •400 1 6 if 1-375 4t 4-75
14 •425 6 U 1-500 21- 5 5*00
14 •450 5 1» 1-625 2« 54 5'25
14 •475 5 13 1-750 i 54 5-50
12 t •500 . Q li 1-875 5i 575
12 • 525 | 4i 2 2-000 2* 6 6-UO
12 •■550 4| 2'125
12 •575 1 2i 2-250
Whitwokth’s Gas Thkeabs.
Diameter in inches ± .1 i 3 9 1 4 1 li 1 u li 2
No. of Threads per ) inch 5 28 19 14 14 11 11 11 11 11
Whitwobth’s Standard Watch and Mathematical
Instbument Schews.
Diam. from in. to „ •010 •014 •015 •019 •020 •024 ■026 •030 •032 •038 •040 •055 ■060 •075 •080 •095 •10
Threads per in. 250 210 180 150 120 100 80 60 50
2 E 2