4 files changed, +542 −37

part.py +36 −31

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		@@ -1,44 +1,49 @@
1		-"""ISO 10642 (DIN 7991) countersunk socket screw. Envelope: 90 degree head and plain shank in one revolved
2		-profile, hex socket. The head's top face is on the XY plane at the origin; `length` is the overall length.
	1	+"""Hexagon socket countersunk head screw, ISO 10642 (DIN 7991), M3 to M12, any length.
3	2
4		-Material: property class 10.9 alloy steel, quenched and tempered (34CrNiMo6 from the material library), black oxide."""
	3	+Envelope model for assemblies: 90 degree countersunk head (the cone of the theoretical sharp-edge diameter dk th and
	4	+height k, its rim turned to the actual head diameter dk min, so it sits in a countersink exactly as the standard
	5	+intends), hexagon socket (key size s, depth t min) and a plain shank at the nominal thread diameter d (the thread is not
	6	+modelled). The head's top face is on the XY plane at the origin, the screw along -Z; `length` is the nominal length
	7	+l, the overall length (head included), as the standard measures it.
	8	+"""
5	9	from steve import Model
6	10
7	11	size = "M4" # Thread size
8		-length = 12 # mm Overall length (head included)
	12	+length = 12 # mm Nominal length (overall, head included)
	13	+material = "steel" # Material
9	14
10		-# size: (head diameter dk, head height k, hex key s)
11		-HEADS = {
12		- 'M3': (6.72, 1.86, 2.0),
13		- 'M4': (8.96, 2.48, 2.5),
14		- 'M5': (11.2, 3.1, 3.0),
15		- 'M6': (13.44, 3.72, 4.0),
16		- 'M8': (17.92, 4.96, 5.0),
17		- 'M10': (22.4, 6.2, 6.0),
18		- 'M12': (26.88, 7.44, 8.0),
	15	+# ISO 10642:2004, Table 1 (official preview p. 4:
	16	+# https://cdn.standards.iteh.ai/samples/34454/32dec7e84d974361b85f744935ab2175/ISO-10642-2004.pdf; also
	17	+# https://fasten.it/en/Norms/Norm/DIN%20EN%20ISO%2010642, editions 2004-06 and 2013-04). size: (thread d, head diameter dk theoretical max, head diameter dk actual min,
	18	+# head height k max, hexagon socket s, socket depth t min)
	19	+DIMENSIONS = {
	20	+ "M3": (3.0, 6.72, 5.54, 1.86, 2.0, 1.1),
	21	+ "M4": (4.0, 8.96, 7.53, 2.48, 2.5, 1.5),
	22	+ "M5": (5.0, 11.2, 9.43, 3.1, 3.0, 1.9),
	23	+ "M6": (6.0, 13.44, 11.34, 3.72, 4.0, 2.2),
	24	+ "M8": (8.0, 17.92, 15.24, 4.96, 5.0, 3.0),
	25	+ "M10": (10.0, 22.4, 19.22, 6.2, 6.0, 3.6),
	26	+ "M12": (12.0, 26.88, 23.12, 7.44, 8.0, 4.3),
19	27	}
20		-NOMINAL = {
21		- 'M3': 3.0,
22		- 'M4': 4.0,
23		- 'M5': 5.0,
24		- 'M6': 6.0,
25		- 'M8': 8.0,
26		- 'M10': 10.0,
27		- 'M12': 12.0,
	28	+# material choice: (STEVE material library id, appearance colour)
	29	+MATERIALS = {
	30	+ "steel": ("steel-generic", "#2b2d30"), # property class 8.8 / 10.9 / 12.9, black oxide finish
	31	+ "stainless-a2": ("stainless-304", "#c9ccd0"), # ISO 3506-1 A2-70
	32	+ "stainless-a4": ("stainless-316", "#c9ccd0"), # ISO 3506-1 A4-70 / A4-80
28	33	}
29		-dk, k, s = HEADS[size]
30		-d = NOMINAL[size]
31		-cone = (dk - d) / 2 # 90 degree countersink: as deep as it is wide
32		-total = max(length, cone + 0.5)
	34	+
	35	+d, dk_th, dk, k, s, t = DIMENSIONS[size]
	36	+material_id, colour = MATERIALS[material]
	37	+total = max(length, k + 0.5)
	38	+land = (dk_th - dk) / 2 # the 90° cone reaches dk this far under the top face
33	39
34	40	model = Model()
35	41	with model.sketch("profile", on="XZ", name="Profile") as sk:
36		- sk.polyline("outline", [(0, 0), (dk / 2, 0), (d / 2, -cone), (d / 2, -total), (0, -total)])
37		-model.revolve("body", "profile", axis="Z")
38		-with model.sketch("socket_sketch", on="XY", name="Hex socket") as sk:
	42	+ sk.polyline("outline", [(0, 0), (dk / 2, 0), (dk / 2, -land), (d / 2, -k), (d / 2, -total), (0, -total)])
	43	+model.revolve("body", "profile", axis="Z", name="Screw")
	44	+with model.sketch("socket_sketch", on="XY", name="Hexagon socket") as sk:
39	45	sk.polygon("hex", (0, 0), s / 2, 6, inscribed=False)
40		-model.extrude("socket", "socket_sketch", distance=-0.8 * k, op="cut")
41		-model.material("steel-34crnimo6") # class 10.9 alloy steel
42		-model.appearance(color="#2e3034", metalness=0.75, roughness=0.38) # black oxide finish
	46	+model.extrude("socket", "socket_sketch", distance=-t, op="cut", name="Socket")
	47	+model.material(material_id, color=colour)
43	48	result = model.result()
44	49

pypart.toml +18 −6

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		@@ -1,11 +1,15 @@
1	1	name = "steve/countersunk-screw"
2		-version = "1.1.0"
	2	+version = "2.0.0"
3	3	runtime = "steve"
4	4	license = "MIT"
5		-summary = "Countersunk socket screw, ISO 10642 / DIN 7991, M3 to M12, any length."
6		-description = "ISO 10642 (DIN 7991) countersunk socket screw. Envelope: 90 degree head and plain shank in one revolved\nprofile, hex socket. The head's top face is on the XY plane at the origin; `length` is the overall length.\n\nMaterial: property class 10.9 alloy steel, quenched and tempered (34CrNiMo6 from the material library), black oxide.\n\nDimensions from STEVE's standard-part tables (nominal values of the standard). Envelope geometry: no modelled thread."
7		-tags = ["fastener", "screw", "iso-10642", "din-7991", "metric"]
8		-changes = "Materials and finishes: each part is made of its standard's engineering material, with its usual finish."
	5	+summary = "Hexagon socket countersunk head screw, ISO 10642 / DIN 7991, M3 to M12, any length, with catalogue sizes as presets."
	6	+description = """ISO 10642 (DIN 7991) hexagon socket countersunk head screw. Envelope geometry for assemblies: 90° \
	7	+head (the theoretical sharp-edge cone of height k, rim at the actual head diameter dk min), hexagon socket (s, t min) and a plain shank at the nominal \
	8	+thread diameter; the thread itself is not modelled.
	9	+
	10	+The head's top face is on the XY plane at the origin and the screw points along -Z; `length` is the nominal length, \
	11	+overall (head included), as the standard measures it. Dimensions from ISO 10642:2004 Table 1 (see the README)."""
	12	+tags = ["fastener", "screw", "countersunk", "flat-head", "iso-10642", "din-7991", "metric"]
9	13
10	14	[parameters.size]
11	15	type = "choice"
		@@ -17,8 +21,16 @@
17	21	type = "number"
18	22	default = 12
19	23	min = 3
20		-max = 120
	24	+max = 200
21	25	step = 1
22	26	unit = "mm"
23	27	label = "Length"
	28	+description = "Nominal length l, overall (head included). At least the head height plus 0.5 mm."
24	29
	30	+[parameters.material]
	31	+type = "choice"
	32	+default = "steel"
	33	+choices = ["steel", "stainless-a2", "stainless-a4"]
	34	+label = "Material"
	35	+description = "steel: property class 8.8 to 12.9, black oxide; stainless-a2 / stainless-a4: ISO 3506-1 A2 / A4."
	36	+

presets.toml added in 2.0.0

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		@@ -1,0 +1,436 @@
	1	+# Presets of this part (factory/PRESETS.md). Written by factory/gen.py.
	2	+
	3	+[[presets]]
	4	+id = "M3x4"
	5	+title = "M3 × 4"
	6	+params = { size = "M3", length = 4 }
	7	+aliases = ["ISO 10642 M3x4", "DIN 7991 M3x4", "countersunk screw M3x4", "flat head socket screw M3x4", "M3 x 4 mm"]
	8	+standard = "ISO 10642"
	9	+
	10	+[[presets]]
	11	+id = "M3x5"
	12	+title = "M3 × 5"
	13	+params = { size = "M3", length = 5 }
	14	+aliases = ["ISO 10642 M3x5", "DIN 7991 M3x5", "countersunk screw M3x5", "flat head socket screw M3x5", "M3 x 5 mm"]
	15	+standard = "ISO 10642"
	16	+
	17	+[[presets]]
	18	+id = "M3x6"
	19	+title = "M3 × 6"
	20	+params = { size = "M3", length = 6 }
	21	+aliases = ["ISO 10642 M3x6", "DIN 7991 M3x6", "countersunk screw M3x6", "flat head socket screw M3x6", "M3 countersunk socket screw", "ISO10642 M3x6"]
	22	+standard = "ISO 10642"
	23	+
	24	+[[presets]]
	25	+id = "M3x8"
	26	+title = "M3 × 8"
	27	+params = { size = "M3", length = 8 }
	28	+aliases = ["ISO 10642 M3x8", "DIN 7991 M3x8", "countersunk screw M3x8", "flat head socket screw M3x8", "M3 x 8 mm"]
	29	+standard = "ISO 10642"
	30	+
	31	+[[presets]]
	32	+id = "M3x10"
	33	+title = "M3 × 10"
	34	+params = { size = "M3", length = 10 }
	35	+aliases = ["ISO 10642 M3x10", "DIN 7991 M3x10", "countersunk screw M3x10", "flat head socket screw M3x10", "M3 countersunk socket screw", "ISO10642 M3x10"]
	36	+standard = "ISO 10642"
	37	+
	38	+[[presets]]
	39	+id = "M3x12"
	40	+title = "M3 × 12"
	41	+params = { size = "M3", length = 12 }
	42	+aliases = ["ISO 10642 M3x12", "DIN 7991 M3x12", "countersunk screw M3x12", "flat head socket screw M3x12", "M3 countersunk socket screw", "ISO10642 M3x12"]
	43	+standard = "ISO 10642"
	44	+
	45	+[[presets]]
	46	+id = "M3x16"
	47	+title = "M3 × 16"
	48	+params = { size = "M3", length = 16 }
	49	+aliases = ["ISO 10642 M3x16", "DIN 7991 M3x16", "countersunk screw M3x16", "flat head socket screw M3x16", "M3 x 16 mm"]
	50	+standard = "ISO 10642"
	51	+
	52	+[[presets]]
	53	+id = "M3x20"
	54	+title = "M3 × 20"
	55	+params = { size = "M3", length = 20 }
	56	+aliases = ["ISO 10642 M3x20", "DIN 7991 M3x20", "countersunk screw M3x20", "flat head socket screw M3x20", "M3 x 20 mm"]
	57	+standard = "ISO 10642"
	58	+
	59	+[[presets]]
	60	+id = "M3x25"
	61	+title = "M3 × 25"
	62	+params = { size = "M3", length = 25 }
	63	+aliases = ["ISO 10642 M3x25", "DIN 7991 M3x25", "countersunk screw M3x25", "flat head socket screw M3x25", "M3 x 25 mm"]
	64	+standard = "ISO 10642"
	65	+
	66	+[[presets]]
	67	+id = "M3x30"
	68	+title = "M3 × 30"
	69	+params = { size = "M3", length = 30 }
	70	+aliases = ["ISO 10642 M3x30", "DIN 7991 M3x30", "countersunk screw M3x30", "flat head socket screw M3x30", "M3 x 30 mm"]
	71	+standard = "ISO 10642"
	72	+
	73	+[[presets]]
	74	+id = "M3x35"
	75	+title = "M3 × 35"
	76	+params = { size = "M3", length = 35 }
	77	+aliases = ["ISO 10642 M3x35", "DIN 7991 M3x35", "countersunk screw M3x35", "flat head socket screw M3x35", "M3 x 35 mm"]
	78	+standard = "ISO 10642"
	79	+
	80	+[[presets]]
	81	+id = "M3x40"
	82	+title = "M3 × 40"
	83	+params = { size = "M3", length = 40 }
	84	+aliases = ["ISO 10642 M3x40", "DIN 7991 M3x40", "countersunk screw M3x40", "flat head socket screw M3x40", "M3 x 40 mm"]
	85	+standard = "ISO 10642"
	86	+
	87	+[[presets]]
	88	+id = "M3x50"
	89	+title = "M3 × 50"
	90	+params = { size = "M3", length = 50 }
	91	+aliases = ["ISO 10642 M3x50", "DIN 7991 M3x50", "countersunk screw M3x50", "flat head socket screw M3x50", "M3 x 50 mm"]
	92	+standard = "ISO 10642"
	93	+
	94	+[[presets]]
	95	+id = "M4x4"
	96	+title = "M4 × 4"
	97	+params = { size = "M4", length = 4 }
	98	+aliases = ["ISO 10642 M4x4", "DIN 7991 M4x4", "countersunk screw M4x4", "flat head socket screw M4x4", "M4 x 4 mm"]
	99	+standard = "ISO 10642"
	100	+
	101	+[[presets]]
	102	+id = "M4x5"
	103	+title = "M4 × 5"
	104	+params = { size = "M4", length = 5 }
	105	+aliases = ["ISO 10642 M4x5", "DIN 7991 M4x5", "countersunk screw M4x5", "flat head socket screw M4x5", "M4 x 5 mm"]
	106	+standard = "ISO 10642"
	107	+
	108	+[[presets]]
	109	+id = "M4x6"
	110	+title = "M4 × 6"
	111	+params = { size = "M4", length = 6 }
	112	+aliases = ["ISO 10642 M4x6", "DIN 7991 M4x6", "countersunk screw M4x6", "flat head socket screw M4x6", "M4 x 6 mm"]
	113	+standard = "ISO 10642"
	114	+
	115	+[[presets]]
	116	+id = "M4x8"
	117	+title = "M4 × 8"
	118	+params = { size = "M4", length = 8 }
	119	+aliases = ["ISO 10642 M4x8", "DIN 7991 M4x8", "countersunk screw M4x8", "flat head socket screw M4x8", "M4 x 8 mm"]
	120	+standard = "ISO 10642"
	121	+
	122	+[[presets]]
	123	+id = "M4x10"
	124	+title = "M4 × 10"
	125	+params = { size = "M4", length = 10 }
	126	+aliases = ["ISO 10642 M4x10", "DIN 7991 M4x10", "countersunk screw M4x10", "flat head socket screw M4x10", "M4 x 10 mm"]
	127	+standard = "ISO 10642"
	128	+
	129	+[[presets]]
	130	+id = "M4x12"
	131	+title = "M4 × 12"
	132	+params = { size = "M4", length = 12 }
	133	+aliases = ["ISO 10642 M4x12", "DIN 7991 M4x12", "countersunk screw M4x12", "flat head socket screw M4x12", "M4 x 12 mm"]
	134	+standard = "ISO 10642"
	135	+
	136	+[[presets]]
	137	+id = "M4x16"
	138	+title = "M4 × 16"
	139	+params = { size = "M4", length = 16 }
	140	+aliases = ["ISO 10642 M4x16", "DIN 7991 M4x16", "countersunk screw M4x16", "flat head socket screw M4x16", "M4 x 16 mm"]
	141	+standard = "ISO 10642"
	142	+
	143	+[[presets]]
	144	+id = "M4x20"
	145	+title = "M4 × 20"
	146	+params = { size = "M4", length = 20 }
	147	+aliases = ["ISO 10642 M4x20", "DIN 7991 M4x20", "countersunk screw M4x20", "flat head socket screw M4x20", "M4 x 20 mm"]
	148	+standard = "ISO 10642"
	149	+
	150	+[[presets]]
	151	+id = "M4x25"
	152	+title = "M4 × 25"
	153	+params = { size = "M4", length = 25 }
	154	+aliases = ["ISO 10642 M4x25", "DIN 7991 M4x25", "countersunk screw M4x25", "flat head socket screw M4x25", "M4 x 25 mm"]
	155	+standard = "ISO 10642"
	156	+
	157	+[[presets]]
	158	+id = "M4x30"
	159	+title = "M4 × 30"
	160	+params = { size = "M4", length = 30 }
	161	+aliases = ["ISO 10642 M4x30", "DIN 7991 M4x30", "countersunk screw M4x30", "flat head socket screw M4x30", "M4 x 30 mm"]
	162	+standard = "ISO 10642"
	163	+
	164	+[[presets]]
	165	+id = "M4x35"
	166	+title = "M4 × 35"
	167	+params = { size = "M4", length = 35 }
	168	+aliases = ["ISO 10642 M4x35", "DIN 7991 M4x35", "countersunk screw M4x35", "flat head socket screw M4x35", "M4 x 35 mm"]
	169	+standard = "ISO 10642"
	170	+
	171	+[[presets]]
	172	+id = "M4x40"
	173	+title = "M4 × 40"
	174	+params = { size = "M4", length = 40 }
	175	+aliases = ["ISO 10642 M4x40", "DIN 7991 M4x40", "countersunk screw M4x40", "flat head socket screw M4x40", "M4 x 40 mm"]
	176	+standard = "ISO 10642"
	177	+
	178	+[[presets]]
	179	+id = "M4x50"
	180	+title = "M4 × 50"
	181	+params = { size = "M4", length = 50 }
	182	+aliases = ["ISO 10642 M4x50", "DIN 7991 M4x50", "countersunk screw M4x50", "flat head socket screw M4x50", "M4 x 50 mm"]
	183	+standard = "ISO 10642"
	184	+
	185	+[[presets]]
	186	+id = "M5x4"
	187	+title = "M5 × 4"
	188	+params = { size = "M5", length = 4 }
	189	+aliases = ["ISO 10642 M5x4", "DIN 7991 M5x4", "countersunk screw M5x4", "flat head socket screw M5x4", "M5 x 4 mm"]
	190	+standard = "ISO 10642"
	191	+
	192	+[[presets]]
	193	+id = "M5x5"
	194	+title = "M5 × 5"
	195	+params = { size = "M5", length = 5 }
	196	+aliases = ["ISO 10642 M5x5", "DIN 7991 M5x5", "countersunk screw M5x5", "flat head socket screw M5x5", "M5 x 5 mm"]
	197	+standard = "ISO 10642"
	198	+
	199	+[[presets]]
	200	+id = "M5x6"
	201	+title = "M5 × 6"
	202	+params = { size = "M5", length = 6 }
	203	+aliases = ["ISO 10642 M5x6", "DIN 7991 M5x6", "countersunk screw M5x6", "flat head socket screw M5x6", "M5 x 6 mm"]
	204	+standard = "ISO 10642"
	205	+
	206	+[[presets]]
	207	+id = "M5x8"
	208	+title = "M5 × 8"
	209	+params = { size = "M5", length = 8 }
	210	+aliases = ["ISO 10642 M5x8", "DIN 7991 M5x8", "countersunk screw M5x8", "flat head socket screw M5x8", "M5 x 8 mm"]
	211	+standard = "ISO 10642"
	212	+
	213	+[[presets]]
	214	+id = "M5x10"
	215	+title = "M5 × 10"
	216	+params = { size = "M5", length = 10 }
	217	+aliases = ["ISO 10642 M5x10", "DIN 7991 M5x10", "countersunk screw M5x10", "flat head socket screw M5x10", "M5 x 10 mm"]
	218	+standard = "ISO 10642"
	219	+
	220	+[[presets]]
	221	+id = "M5x12"
	222	+title = "M5 × 12"
	223	+params = { size = "M5", length = 12 }
	224	+aliases = ["ISO 10642 M5x12", "DIN 7991 M5x12", "countersunk screw M5x12", "flat head socket screw M5x12", "M5 x 12 mm"]
	225	+standard = "ISO 10642"
	226	+
	227	+[[presets]]
	228	+id = "M5x16"
	229	+title = "M5 × 16"
	230	+params = { size = "M5", length = 16 }
	231	+aliases = ["ISO 10642 M5x16", "DIN 7991 M5x16", "countersunk screw M5x16", "flat head socket screw M5x16", "M5 x 16 mm"]
	232	+standard = "ISO 10642"
	233	+
	234	+[[presets]]
	235	+id = "M5x20"
	236	+title = "M5 × 20"
	237	+params = { size = "M5", length = 20 }
	238	+aliases = ["ISO 10642 M5x20", "DIN 7991 M5x20", "countersunk screw M5x20", "flat head socket screw M5x20", "M5 x 20 mm"]
	239	+standard = "ISO 10642"
	240	+
	241	+[[presets]]
	242	+id = "M5x25"
	243	+title = "M5 × 25"
	244	+params = { size = "M5", length = 25 }
	245	+aliases = ["ISO 10642 M5x25", "DIN 7991 M5x25", "countersunk screw M5x25", "flat head socket screw M5x25", "M5 x 25 mm"]
	246	+standard = "ISO 10642"
	247	+
	248	+[[presets]]
	249	+id = "M5x30"
	250	+title = "M5 × 30"
	251	+params = { size = "M5", length = 30 }
	252	+aliases = ["ISO 10642 M5x30", "DIN 7991 M5x30", "countersunk screw M5x30", "flat head socket screw M5x30", "M5 x 30 mm"]
	253	+standard = "ISO 10642"
	254	+
	255	+[[presets]]
	256	+id = "M5x35"
	257	+title = "M5 × 35"
	258	+params = { size = "M5", length = 35 }
	259	+aliases = ["ISO 10642 M5x35", "DIN 7991 M5x35", "countersunk screw M5x35", "flat head socket screw M5x35", "M5 x 35 mm"]
	260	+standard = "ISO 10642"
	261	+
	262	+[[presets]]
	263	+id = "M5x40"
	264	+title = "M5 × 40"
	265	+params = { size = "M5", length = 40 }
	266	+aliases = ["ISO 10642 M5x40", "DIN 7991 M5x40", "countersunk screw M5x40", "flat head socket screw M5x40", "M5 x 40 mm"]
	267	+standard = "ISO 10642"
	268	+
	269	+[[presets]]
	270	+id = "M5x50"
	271	+title = "M5 × 50"
	272	+params = { size = "M5", length = 50 }
	273	+aliases = ["ISO 10642 M5x50", "DIN 7991 M5x50", "countersunk screw M5x50", "flat head socket screw M5x50", "M5 x 50 mm"]
	274	+standard = "ISO 10642"
	275	+
	276	+[[presets]]
	277	+id = "M6x5"
	278	+title = "M6 × 5"
	279	+params = { size = "M6", length = 5 }
	280	+aliases = ["ISO 10642 M6x5", "DIN 7991 M6x5", "countersunk screw M6x5", "flat head socket screw M6x5", "M6 x 5 mm"]
	281	+standard = "ISO 10642"
	282	+
	283	+[[presets]]
	284	+id = "M6x6"
	285	+title = "M6 × 6"
	286	+params = { size = "M6", length = 6 }
	287	+aliases = ["ISO 10642 M6x6", "DIN 7991 M6x6", "countersunk screw M6x6", "flat head socket screw M6x6", "M6 x 6 mm"]
	288	+standard = "ISO 10642"
	289	+
	290	+[[presets]]
	291	+id = "M6x8"
	292	+title = "M6 × 8"
	293	+params = { size = "M6", length = 8 }
	294	+aliases = ["ISO 10642 M6x8", "DIN 7991 M6x8", "countersunk screw M6x8", "flat head socket screw M6x8", "M6 x 8 mm"]
	295	+standard = "ISO 10642"
	296	+
	297	+[[presets]]
	298	+id = "M6x10"
	299	+title = "M6 × 10"
	300	+params = { size = "M6", length = 10 }
	301	+aliases = ["ISO 10642 M6x10", "DIN 7991 M6x10", "countersunk screw M6x10", "flat head socket screw M6x10", "M6 x 10 mm"]
	302	+standard = "ISO 10642"
	303	+
	304	+[[presets]]
	305	+id = "M6x12"
	306	+title = "M6 × 12"
	307	+params = { size = "M6", length = 12 }
	308	+aliases = ["ISO 10642 M6x12", "DIN 7991 M6x12", "countersunk screw M6x12", "flat head socket screw M6x12", "M6 countersunk socket screw", "ISO10642 M6x12"]
	309	+standard = "ISO 10642"
	310	+
	311	+[[presets]]
	312	+id = "M6x16"
	313	+title = "M6 × 16"
	314	+params = { size = "M6", length = 16 }
	315	+aliases = ["ISO 10642 M6x16", "DIN 7991 M6x16", "countersunk screw M6x16", "flat head socket screw M6x16", "M6 x 16 mm"]
	316	+standard = "ISO 10642"
	317	+
	318	+[[presets]]
	319	+id = "M6x20"
	320	+title = "M6 × 20"
	321	+params = { size = "M6", length = 20 }
	322	+aliases = ["ISO 10642 M6x20", "DIN 7991 M6x20", "countersunk screw M6x20", "flat head socket screw M6x20", "M6 x 20 mm"]
	323	+standard = "ISO 10642"
	324	+
	325	+[[presets]]
	326	+id = "M6x25"
	327	+title = "M6 × 25"
	328	+params = { size = "M6", length = 25 }
	329	+aliases = ["ISO 10642 M6x25", "DIN 7991 M6x25", "countersunk screw M6x25", "flat head socket screw M6x25", "M6 x 25 mm"]
	330	+standard = "ISO 10642"
	331	+
	332	+[[presets]]
	333	+id = "M6x30"
	334	+title = "M6 × 30"
	335	+params = { size = "M6", length = 30 }
	336	+aliases = ["ISO 10642 M6x30", "DIN 7991 M6x30", "countersunk screw M6x30", "flat head socket screw M6x30", "M6 x 30 mm"]
	337	+standard = "ISO 10642"
	338	+
	339	+[[presets]]
	340	+id = "M6x35"
	341	+title = "M6 × 35"
	342	+params = { size = "M6", length = 35 }
	343	+aliases = ["ISO 10642 M6x35", "DIN 7991 M6x35", "countersunk screw M6x35", "flat head socket screw M6x35", "M6 x 35 mm"]
	344	+standard = "ISO 10642"
	345	+
	346	+[[presets]]
	347	+id = "M6x40"
	348	+title = "M6 × 40"
	349	+params = { size = "M6", length = 40 }
	350	+aliases = ["ISO 10642 M6x40", "DIN 7991 M6x40", "countersunk screw M6x40", "flat head socket screw M6x40", "M6 x 40 mm"]
	351	+standard = "ISO 10642"
	352	+
	353	+[[presets]]
	354	+id = "M6x50"
	355	+title = "M6 × 50"
	356	+params = { size = "M6", length = 50 }
	357	+aliases = ["ISO 10642 M6x50", "DIN 7991 M6x50", "countersunk screw M6x50", "flat head socket screw M6x50", "M6 x 50 mm"]
	358	+standard = "ISO 10642"
	359	+
	360	+[[presets]]
	361	+id = "M8x6"
	362	+title = "M8 × 6"
	363	+params = { size = "M8", length = 6 }
	364	+aliases = ["ISO 10642 M8x6", "DIN 7991 M8x6", "countersunk screw M8x6", "flat head socket screw M8x6", "M8 x 6 mm"]
	365	+standard = "ISO 10642"
	366	+
	367	+[[presets]]
	368	+id = "M8x8"
	369	+title = "M8 × 8"
	370	+params = { size = "M8", length = 8 }
	371	+aliases = ["ISO 10642 M8x8", "DIN 7991 M8x8", "countersunk screw M8x8", "flat head socket screw M8x8", "M8 x 8 mm"]
	372	+standard = "ISO 10642"
	373	+
	374	+[[presets]]
	375	+id = "M8x10"
	376	+title = "M8 × 10"
	377	+params = { size = "M8", length = 10 }
	378	+aliases = ["ISO 10642 M8x10", "DIN 7991 M8x10", "countersunk screw M8x10", "flat head socket screw M8x10", "M8 x 10 mm"]
	379	+standard = "ISO 10642"
	380	+
	381	+[[presets]]
	382	+id = "M8x12"
	383	+title = "M8 × 12"
	384	+params = { size = "M8", length = 12 }
	385	+aliases = ["ISO 10642 M8x12", "DIN 7991 M8x12", "countersunk screw M8x12", "flat head socket screw M8x12", "M8 x 12 mm"]
	386	+standard = "ISO 10642"
	387	+
	388	+[[presets]]
	389	+id = "M8x16"
	390	+title = "M8 × 16"
	391	+params = { size = "M8", length = 16 }
	392	+aliases = ["ISO 10642 M8x16", "DIN 7991 M8x16", "countersunk screw M8x16", "flat head socket screw M8x16", "M8 x 16 mm"]
	393	+standard = "ISO 10642"
	394	+
	395	+[[presets]]
	396	+id = "M8x20"
	397	+title = "M8 × 20"
	398	+params = { size = "M8", length = 20 }
	399	+aliases = ["ISO 10642 M8x20", "DIN 7991 M8x20", "countersunk screw M8x20", "flat head socket screw M8x20", "M8 x 20 mm"]
	400	+standard = "ISO 10642"
	401	+
	402	+[[presets]]
	403	+id = "M8x25"
	404	+title = "M8 × 25"
	405	+params = { size = "M8", length = 25 }
	406	+aliases = ["ISO 10642 M8x25", "DIN 7991 M8x25", "countersunk screw M8x25", "flat head socket screw M8x25", "M8 x 25 mm"]
	407	+standard = "ISO 10642"
	408	+
	409	+[[presets]]
	410	+id = "M8x30"
	411	+title = "M8 × 30"
	412	+params = { size = "M8", length = 30 }
	413	+aliases = ["ISO 10642 M8x30", "DIN 7991 M8x30", "countersunk screw M8x30", "flat head socket screw M8x30", "M8 x 30 mm"]
	414	+standard = "ISO 10642"
	415	+
	416	+[[presets]]
	417	+id = "M8x35"
	418	+title = "M8 × 35"
	419	+params = { size = "M8", length = 35 }
	420	+aliases = ["ISO 10642 M8x35", "DIN 7991 M8x35", "countersunk screw M8x35", "flat head socket screw M8x35", "M8 x 35 mm"]
	421	+standard = "ISO 10642"
	422	+
	423	+[[presets]]
	424	+id = "M8x40"
	425	+title = "M8 × 40"
	426	+params = { size = "M8", length = 40 }
	427	+aliases = ["ISO 10642 M8x40", "DIN 7991 M8x40", "countersunk screw M8x40", "flat head socket screw M8x40", "M8 x 40 mm"]
	428	+standard = "ISO 10642"
	429	+
	430	+[[presets]]
	431	+id = "M8x50"
	432	+title = "M8 × 50"
	433	+params = { size = "M8", length = 50 }
	434	+aliases = ["ISO 10642 M8x50", "DIN 7991 M8x50", "countersunk screw M8x50", "flat head socket screw M8x50", "M8 x 50 mm"]
	435	+standard = "ISO 10642"
	436	+

README.md added in 2.0.0

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		@@ -1,0 +1,52 @@
	1	+# Countersunk head screw (ISO 10642 / DIN 7991)
	2	+
	3	+Hexagon socket countersunk (flat) head screw, metric coarse thread, M3 to M12, at any length. Presets cover the
	4	+common catalogue sizes (M3 × 8, M5 × 16, ...).
	5	+
	6	+## Geometry
	7	+
	8	+Envelope for assemblies and countersink checks:
	9	+
	10	+- 90° countersunk head: the cone of the theoretical (sharp-edge) diameter **dk th** and height **k** = (dk th − d) / 2,
	11	+ its rim turned to the actual head diameter **dk min** (a short cylindrical land at the top), so the cone seats in a
	12	+ countersink exactly as the standard intends;
	13	+- hexagon socket, key size **s** (nominal), depth **t min**, flat bottom;
	14	+- plain shank at the nominal thread diameter **d**; the thread is not modelled.
	15	+
	16	+`length` is the nominal length l, measured overall (head included) as ISO 10642 does; it must be at least k + 0.5 mm.
	17	+The head's top face is on the XY plane at the origin, the screw along -Z.
	18	+
	19	+## Parameters
	20	+
	21	+| Parameter | Meaning |
	22	+|---|---|
	23	+| `size` | Thread size, M3 to M12 |
	24	+| `length` | Nominal length l, overall, mm |
	25	+| `material` | `steel` (property class 8.8 to 12.9, black oxide), `stainless-a2`, `stainless-a4` (ISO 3506-1) |
	26	+
	27	+## Source
	28	+
	29	+ISO 10642:2004, *Hexagon socket countersunk head screws*, Table 1, p. 4: d, dk theoretical max, dk actual min, k max,
	30	+s (nominal), t min, read from the official preview
	31	+(<https://cdn.standards.iteh.ai/samples/34454/32dec7e84d974361b85f744935ab2175/ISO-10642-2004.pdf>; the M8 t is
	32	+under the preview's watermark and was read from fasten.it) and checked against fasten.it's DIN EN ISO 10642 2004-06
	33	+and 2013-04 tables (<https://fasten.it/en/Norms/Norm/DIN%20EN%20ISO%2010642>). Amendment 1:2012 changes only dk min of
	34	+M20 (not offered here).
	35	+
	36	+Edition note: ISO 10642:2019 (DIN EN ISO 10642:2020-02; carried into ISO 10642:2026) replaced w min by t max and,
	37	+in fasten.it's reproduction of DIN EN ISO 10642:2020-02 (its only source found), lists smaller t min for M4 (1.4),
	38	+M5 (1.75), M8 (2.9) and M10 (3.5). This recipe models the 2004 edition's values, which are confirmed by the official
	39	+preview; every other column is the same in both.
	40	+
	41	+| Size | dk th | dk min | k | s | t |
	42	+|---|---|---|---|---|---|
	43	+| M3 | 6.72 | 5.54 | 1.86 | 2.0 | 1.1 |
	44	+| M4 | 8.96 | 7.53 | 2.48 | 2.5 | 1.5 |
	45	+| M5 | 11.2 | 9.43 | 3.1 | 3.0 | 1.9 |
	46	+| M6 | 13.44 | 11.34 | 3.72 | 4.0 | 2.2 |
	47	+| M8 | 17.92 | 15.24 | 4.96 | 5.0 | 3.0 |
	48	+| M10 | 22.4 | 19.22 | 6.2 | 6.0 | 3.6 |
	49	+| M12 | 26.88 | 23.12 | 7.44 | 8.0 | 4.3 |
	50	+
	51	+Preset list: sizes and lengths of the step.parts catalogue (MIT), see `library/NOTICE.md`.
	52	+