BS 4183 Slotted Cheese Head Machine Screws

Nominal Size d^a	Head Diameter D		Head Height k		Radius rb	Transition Diameter d^a	Thread Length b	Thread Run-out a	Slot Width n		Slot Depth t
Nominal Size d^a	Max.	Min.	Max.	Min.	Min.	Max.	Min.	Max. c	Max.	Min.	Max.	Min.
BS 4183 - M1	2	1.75	0.7	0.56	0.1	1.3	b	0.5	0.45	0.31	0.44	0.3
BS 4183 - M1.2	2.3	2.05	0.8	0.66	0.1	1.5	b	0.5	0.5	0.36	0.49	0.35
BS 4183 - M1.4	2.6	2.35	0.9	0.76	0.1	1.7	b	0.6	0.5	0.36	0.6	0.4
BS 4183 - M1.6	3	2.75	1	0.86	0.1	2	15	0.7	0.6	0.46	0.65	0.45
BS 4183 - M2	3.8	3.5	1.3	1.16	0.1	2.6	16	0.8	0.7	0.56	0.85	0.6
BS 4183 - M2.2	4	3.7	1.5	1.36	0.1	2.8	17	0.9	0.8	0.66	1	0.7
BS 4183 - M2.5	4.5	4.2	1.6	1.46	0.1	3.1	18	0.9	0.8	0.66	1	0.7
BS 4183 - M3	5.5	5.2	2	1.86	0.1	3.6	19	1	1	0.86	1.3	0.9
BS 4183 - M3.5	6	5.7	2.4	2.26	0.1	4.1	20	1.2	1	0.86	1.4	1
BS 4183 - M4	7	6.64	2.6	2.46	0.2	4.7	22	1.4	1.2	1.06	1.6	1.2
BS 4183 - M4.5	8	7.64	3.1	2.92	0.2	5.2	24	1.5	1.2	1.06	1.8	1.4
BS 4183 - M5	8.5	8.14	3.3	3.12	0.2	5.7	25	1.6	1.51	1.26	2	1.5
BS 4183 - M6	10	9.64	3.9	3.72	0.25	6.8	28	2	1.91	1.66	2.3	1.8
BS 4183 - M8	13	12.57	5	4.82	0.4	9.2	34	2.5	2.31	2.06	2.8	2.3
BS 4183 - M10	16	15.57	6	5.82	0.4	11.2	40	3	2.81	2.56	3.2	2.7
BS 4183 - M12	18	17.57	7	6.78	0.6	14.2	46	3.5	3.31	3.06	3.8	3.2
BS 4183 - M14	21	20.48	8	7.78	0.6	16.2	52	4	3.31	3.06	4.2	3.6
BS 4183 - M16	24	23.48	9	8.78	0.6	18.2	58	4	4.37	4.07	4.6	4
BS 4183 - M18	27	26.48	10	9.78	0.6	20.2	64	5	4.37	4.07	5.1	4.5
BS 4183 - M20	30	29.48	11	10.73	0.8	22.4	70	5	5.27	5.07	5.6	5
a Nominal sizes shown in parentheses are non-preferred. b Threaded up to head. c See text following table in Lengths of Thread on Screws description in text. All dimensions are given in millimeters. For dimensional notation, see diagram on page 1610. General Dimensions: The general dimensions and tolerances for screws and nuts are given in the accompanying tables. Although slotted screw dimensions are given, recessed head screws are also standard and available. recessed head screws are given in BS 4183:1967 (obso- lescent).