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GB /T 840 - 1988

Plastic Diamond Knurlhead Screws

GB /T 840 - 1988 塑料滚花头螺钉

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Dimensional Specifications — GB /T 840 - 1988 (mm)

Size	P	k_max	k_min	s_max	s_min	ds_max	k_nominal	ds_nominal
M4	0.8	3.2	2.75	16	6	32	3.5	2.5
M5	1.25	5.2	4.3	25	8	50	5.5	4
M6	1.75	8.14	6.3	32	10	65	8.5	6
M8	2	11.57	8.36	40	12	80	12	8

Related Standards

GB 834 - 1988— Knurled Thumb Screws GB 835 - 1988— Knurled Screws GB 839 - 1988— Knurled Thumb Screws with Waisted Shank GB /T 2163 - 1991— The Parts and Units of Jigs and Fixtures Movable Handle Holddown Screw GB /T 836 - 1988— Knurled Screws with Small Head DIN 464 - 2007— Knurled Thumb Screws, High Type DIN 653 - 2006— Knurled Thumb Screws, Low Type DIN 7964 (F) - 1990— Reduced Shanke Bolts and Screws with Coarse Thread - Knurled Thumb Screws, High Type

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