screw tapn.
/ˈskruː tap/, U.S. /ˈskru ˌtæp/ΚΠ
1639 R. Ward Animadversions of Warre i. §xiv. ccxliv. 363 There is a strong Skrew-Tappe to be made, to fill the skrew-hole, and that is hollow, wherein is put slow-burning-Powder, made of Cannon-Powder beaten fine.
2. A tool used for cutting a thread on the inner surface of a socket, nut, etc., typically consisting of a hardened steel spindle having a series of cutting edges arranged along the path of the thread to be cut.
ΘΚΠ
society > occupation and work > equipment > machine tool > other specific machine tools > [noun] > machine for cutting screw-threads > taps
screw tap1678
tap1678
plug tap1815
tap-tool1874
bottoming tap1875
taper tapa1877
second tap1888
1678 J. Moxon Mech. Exercises I. ii. 31 The screw-tap, that makes the Screw in the Nut.
1789 tr. G. F. Magné De Marolles Ess. Shooting ii. 27 This tool, which is termed a screw tap..is turned from left to right, and back again, until it has marked out the three or four first threads of the screw.
1846 C. Holtzapffel Turning & Mech. Manip. II. xxvi. 664 It is usual, before cutting the nuts in the lathe or with screw taps, to divide the nuts, and to re-unite them with soft solder.
1960 Pop. Mech. Nov. 208/1 By marking the tap and body-drill sizes on screw taps the proper drills can be selected without the need for checking a chart.
2008 M. Lech-Grega & W. Szymanski in J. Hirsch et al. Aluminium Alloys I. 885 A cutting screw-tap removes excess metal from the bore, while cutting the thread, whereas a rolling screw-tap forms the thread by plastic strain of metal and displacement of its plasticized layers.
3. A tap (tap n.1 1a) operated by turning a screw.
ΘΚΠ
society > occupation and work > equipment > other specific types of equipment > [noun] > tap > types of
washer1596
plug1707
ballcock1734
bib cock1797
draw-off1826
plug cock1826
screw tap1842
waste-cock1844
ball tap1849
self-tapping1878
mixing valve1902
mixer tap1936
combination tap1951
mixer1973
1842 Mechanics' Mag. 10 Sept. 265/1 The water is allowed to flow out through an aperture to which there is a screw tap.
1869 E. A. Parkes Man. Pract. Hygiene (ed. 3) 14 Common taps do not answer, and the best screw taps..must be used.
1922 Sanitary & Heating Engin. 20 Oct. 220/2 Connections to screw taps up to two inch shall be made by standard brass couplings.
1963 N. Roper Man's Anat., Physiol., & Health 314 Hot and cold water are provided in the conventional chromium-plated screw taps.
2009 Daily Mail (Nexis) 17 Nov. Plumbers were called in to Belmarsh high security wing to replace the existing screw taps with some controlled by levers to make life easier for jihadist recruiting sergeant Abu Hamza.
This entry has been updated (OED Third Edition, June 2017; most recently modified version published online March 2022).
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n.1639