1、UIX: 621.882.215.082.1 : 681 DEUTSCHE NORMEN November 1969 I - Slotted Cheese Head Screws for Fine Mechanics M 0.3 to M 1.4 EN 8243 I Zylinderschrauben mit Schlitz fr Feinwerktechnik, M 0,3 bis M 1,4 Dimensions in mm Sharp edge removed small head medium head larne head Designation of a cheese head s
2、crew Type A with thread dl I M 0.7, length L I 1.4 nm and strength categorg 5.8: Cheese head screw A M 0.7 x 1.4 DIN 8243 - 5-8 The sizes denoted by the compartments lying between the two stepped lines are preferred sizes. Intermediate lengths are permitted, but should be avoided where possible. 1 P
3、or the threadm M 1. M 1.2 and M 1.4, thin Standard apecifiea only Type A each time. Bee aiao Explanationo. Continued on page 2 Explanations on page 2 Alleinverkauf der Normbltter dur6 Beuth Verlag GmbH, Berlin 30 und Kln DIN 8243 en&. Preisgr Page 2 DIN 8243 Technical conditions of deliver$ accordin
4、g to DIN 267 gggq&-ggqg-q (material) (to be indicated when ordering): 5.8 according to DIN 267 Sheet 3 A2 according to DIN 267 Sheet 11 Other materials subject to agceernent FinihGi f (fine) according to DIN 267 Sheet 6 (at present circulating a8 draft) If surface protection ia required, the designa
5、tion must be augmented according to DIN 267 Sheet 9. Emlanations In the field of fine mechanics space conditione are oftendifficult, so that the correlation of a single head size to a given thread diameter fails to meet the requirements arining in application6 involving small scrows. To provide the
6、widest posible range of variation whilst keeping the number of head siZes comparatively amall, three different head sites have been allocated to each nominal thread diameter, and two sites of each sot match the heads of the next larger and smaller nominal thread oie. respectively. Thu, for example,
7、the medium head of the M 0.7 screw in equal in size to the large head of the M 0.6 and the emall head of the H 0.8 screv. DIN 84, which likewise dealo vith slotted cheese head screws, starte at thread aise M 1, but only covers acrewe in one head sim to each thread diameter. From and including H 1, t
8、he series of cbeerre head rrcrewrr standardized in DIU 84 directly continues the B neries of DIN 8243 in terma of head size Therefore, thi Standard contains no prori6ionrr regarding nominal aizoe M 1 to M 1.4 (Series 8, medium head). Moreover, from and including M 1, Series C (large head) has ceased to be needed, eo that it likewise can be omitted.
