parts.screw.lowcap
parts: C = parts.screw.lowcap ('data')
parts: C = parts.screw.lowcap ('data', NAME)
parts: C = parts.screw.lowcap ('data', NAME, L)
parts: S = parts.screw.lowcap ('solid', NAME, L)
parts: … = parts.screw.lowcap (…, Name, Value)
Hexagon socket head cap screws with low head, DIN 7984.
C = parts.screw.lowcap ( returns every low
head cap screw in the catalogue as a table, one row for each maker’s
article in each size and length, sorted by size and length.
'data')C = parts.screw.lowcap ( returns
those of the thread NAME, such as 'data', NAME)'M8', and
C = parts.screw.lowcap (
those of nominal length L too: every article sold as that screw,
each with its property class and finish. Nothing is built.
'data', NAME, L)
S = parts.screw.lowcap (
builds the screw as a 'solid', NAME, L)solid.Shape whether or not anyone sells it:
any thread of a size the standard defines, any pitch, any length. The
underside of the head lies on the xy plane, the head above it,
the shank below it to z = -L, the hexagon socket sunk into
the head with two of its corners on the x axis.
S.Name holds the screw’s designation.
Name/Value pairs:
'Maker''data': only that maker’s articles, such as
'REYHER', in any case.'ThreadLength''solid': the length of thread b from the end of the
shank, from 0 to L; L threads it to the head. Without it the
screw follows DIN 7984: threaded to the head up to the length its table
gives each size, longer ones threaded b, which depends on the
length (125 or less, up to 200, longer).'Detailed''solid': true also builds the fillet of radius
r under the head and the thread, cut by solid.Shape.thread;
a screw threaded to the head is threaded to within 3 P of it, as
the standard puts its last full thread. By default (false) the
shank is a plain cylinder of diameter d. Either way the socket is
s across flats and t min deep, and the end is left flat. The table has these variables, each with its unit and its description,
which summary (C) lists; lengths are in millimetres:
designation | designation, as in
"Hexagon socket head cap screw with low head DIN 7984 - M8 x
20", without the property class |
standard | 'DIN 7984' when its table defines the
screw, else empty: such a screw is custom |
d | nominal diameter |
P | pitch, coarse |
l | nominal length |
b | length of thread from the end, l when threaded to the head |
dk | head diameter, largest |
k | head height, largest |
drive | 'hexsocket' |
tool | hexagon key, as '5' |
class | property class, as the maker marks it: a leading
0, as in '08.8', marks the reduced loadability of the low head |
finish | finish as the maker names it |
maker | maker |
article | maker’s article number |
source | catalogue and page the article was read from |
A screw is designated by the standard’s number when its table defines it: a length of the size’s commercial range with the thread form the table gives it. Every other screw is custom, its thread length written when shorter than l.
Articles from REYHER, The Catalogue, edition 2020.04, English, pages 362 to 364: every article with a hexagon socket. Left out: the hexalobular article 07984.814, whose socket DIN 7984 does not define.
Dimensions, thread lengths and lengths from DIN 7984:2009-06, Tabelle 1, read in a copy of its German text, which agrees with fasteners.eu in every thread form and thread length; fasteners.eu gives other ranges for some sizes, which an older edition explains.
See also: parts.screw.cap
Source Code: parts.screw.lowcap