4 files changed, +567 −41

part.py +43 −32

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		@@ -1,46 +1,57 @@
1		-"""ISO 7380 button head socket screw. Envelope: domed head (revolved profile), hex socket, plain shank.
2		-The head's flat side is on the XY plane at the origin; the shank points down -Z.
	1	+"""Hexagon socket button head screw, ISO 7380-1, M3 to M16, 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: domed head (a spherical cap of diameter dk max and height k max), hexagon socket (key
	4	+size s, depth t min) and a plain shank at the nominal thread diameter d (the thread is not modelled).
	5	+The head's bearing face is on the XY plane at the origin, the head above it, the shank along -Z; `length` is the
	6	+nominal length l, measured from under the head.
	7	+"""
	8	+import math
	9	+
5	10	from steve import Model
6	11
7		-size = "M4" # Thread size
8		-length = 10 # mm Length under the head
	12	+size = "M5" # Thread size
	13	+length = 10 # mm Nominal length (under the head)
	14	+material = "steel" # Material
9	15
10		-# size: (head diameter dk, head height k, hex key s)
11		-HEADS = {
12		- 'M3': (5.7, 1.65, 2.0),
13		- 'M4': (7.6, 2.2, 2.5),
14		- 'M5': (9.5, 2.75, 3.0),
15		- 'M6': (10.5, 3.3, 4.0),
16		- 'M8': (14.0, 4.4, 5.0),
17		- 'M10': (17.5, 5.5, 6.0),
18		- 'M12': (21.0, 6.6, 8.0),
	16	+# ISO 7380-1:2011, Table 1 (official preview p. 3:
	17	+# https://cdn.standards.iteh.ai/samples/53671/84df01c5fcce4a91896ac3b0c55ca128/ISO-7380-1-2011.pdf); the same values in
	18	+# ISO 7380-1:2022, Table 1 (https://cdn.standards.iteh.ai/samples/78699/a175805085534f98983d6c8aa583a5b0/ISO-7380-1-2022.pdf). size: (thread d, head diameter dk max, head height k max, hexagon socket s, socket depth t min)
	19	+DIMENSIONS = {
	20	+ "M3": (3.0, 5.7, 1.65, 2.0, 1.04),
	21	+ "M4": (4.0, 7.6, 2.2, 2.5, 1.3),
	22	+ "M5": (5.0, 9.5, 2.75, 3.0, 1.56),
	23	+ "M6": (6.0, 10.5, 3.3, 4.0, 2.08),
	24	+ "M8": (8.0, 14.0, 4.4, 5.0, 2.6),
	25	+ "M10": (10.0, 17.5, 5.5, 6.0, 3.12),
	26	+ "M12": (12.0, 21.0, 6.6, 8.0, 4.16),
	27	+ "M16": (16.0, 28.0, 8.8, 10.0, 5.2),
19	28	}
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,
	29	+# material choice: (STEVE material library id, appearance colour)
	30	+MATERIALS = {
	31	+ "steel": ("steel-generic", "#2b2d30"), # property class 10.9 / 12.9, black oxide finish
	32	+ "stainless-a2": ("stainless-304", "#c9ccd0"), # ISO 3506-1 A2-70
	33	+ "stainless-a4": ("stainless-316", "#c9ccd0"), # ISO 3506-1 A4-70 / A4-80
28	34	}
29		-dk, k, s = HEADS[size]
30		-d = NOMINAL[size]
	35	+
	36	+d, dk, k, s, t = DIMENSIONS[size]
	37	+material_id, colour = MATERIALS[material]
	38	+r = dk / 2
	39	+dome_r = (r * r + k * k) / (2 * k) # radius of the spherical cap through the head's rim and top
	40	+start = math.degrees(math.atan2(dome_r - k, r))
31	41
32	42	model = Model()
33	43	with model.sketch("head_profile", on="XZ", name="Head profile") as sk:
34		- sk.polyline("outline", [(0, 0), (dk / 2, 0), (dk / 2, 0.25 * k), (0.42 * dk, 0.7 * k), (0.3 * dk, 0.92 * k), (0, k)])
35		-model.revolve("head", "head_profile", axis="Z")
	44	+ sk.line("base", (0, 0), (r, 0))
	45	+ sk.arc("dome", (0, k - dome_r), dome_r, start, 90)
	46	+ sk.line("axis", (0, k), (0, 0))
	47	+model.revolve("head", "head_profile", axis="Z", name="Head")
36	48	with model.sketch("shank_sketch", on="XY", name="Shank") as sk:
37		- sk.circle("shank", (0, 0), d / 2)
38		-model.extrude("shank", "shank_sketch", distance=-length)
	49	+ sk.circle("shank_circle", (0, 0), d / 2)
	50	+model.extrude("shank", "shank_sketch", distance=-length, name="Shank")
39	51	model.plane("head_top", on="XY", offset=k, name="Head top")
40		-with model.sketch("socket_sketch", on="head_top", name="Hex socket") as sk:
	52	+with model.sketch("socket_sketch", on="head_top", name="Hexagon socket") as sk:
41	53	sk.polygon("hex", (0, 0), s / 2, 6, inscribed=False)
42		-model.extrude("socket", "socket_sketch", distance=-0.6 * k, op="cut")
43		-model.material("steel-34crnimo6") # class 10.9 alloy steel
44		-model.appearance(color="#2e3034", metalness=0.75, roughness=0.38) # black oxide finish
	54	+model.extrude("socket", "socket_sketch", distance=-t, op="cut", name="Socket")
	55	+model.material(material_id, color=colour)
45	56	result = model.result()
46	57

pypart.toml +20 −9

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		@@ -1,24 +1,35 @@
1	1	name = "steve/button-head-screw"
2		-version = "1.1.0"
	2	+version = "2.0.0"
3	3	runtime = "steve"
4	4	license = "MIT"
5		-summary = "Button head socket screw, ISO 7380, M3 to M12, any length."
6		-description = "ISO 7380 button head socket screw. Envelope: domed head (revolved profile), hex socket, plain shank.\nThe head's flat side is on the XY plane at the origin; the shank points down -Z.\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-7380", "metric"]
8		-changes = "Materials and finishes: each part is made of its standard's engineering material, with its usual finish."
	5	+summary = "Hexagon socket button head screw, ISO 7380-1, M3 to M16, any length, with catalogue sizes as presets."
	6	+description = """ISO 7380-1 hexagon socket button head screw. Envelope geometry for assemblies: domed head (dk max, \
	7	+k max), hexagon socket (s, t min) and a plain shank at the nominal thread diameter; the thread itself is not modelled.
	8	+
	9	+The head's bearing face is on the XY plane at the origin and the shank points along -Z; `length` is the nominal \
	10	+length under the head. Dimensions from ISO 7380-1:2011 Table 1 (see the README)."""
	11	+tags = ["fastener", "screw", "button-head", "iso-7380", "metric"]
9	12
10	13	[parameters.size]
11	14	type = "choice"
12		-default = "M4"
13		-choices = ["M3", "M4", "M5", "M6", "M8", "M10", "M12"]
	15	+default = "M5"
	16	+choices = ["M3", "M4", "M5", "M6", "M8", "M10", "M12", "M16"]
14	17	label = "Thread size"
15	18
16	19	[parameters.length]
17	20	type = "number"
18	21	default = 10
19		-min = 3
20		-max = 120
	22	+min = 2
	23	+max = 200
21	24	step = 1
22	25	unit = "mm"
23	26	label = "Length"
	27	+description = "Nominal length l, from under the head to the end of the shank."
24	28
	29	+[parameters.material]
	30	+type = "choice"
	31	+default = "steel"
	32	+choices = ["steel", "stainless-a2", "stainless-a4"]
	33	+label = "Material"
	34	+description = "steel: property class 10.9 / 12.9, black oxide; stainless-a2 / stainless-a4: ISO 3506-1 A2 / A4."
	35	+

presets.toml added in 2.0.0

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		@@ -1,0 +1,457 @@
	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 7380 M3x4", "ISO 7380-1 M3x4", "BHCS M3x4", "button head screw M3x4", "M3 x 4 mm"]
	8	+standard = "ISO 7380-1"
	9	+
	10	+[[presets]]
	11	+id = "M3x5"
	12	+title = "M3 × 5"
	13	+params = { size = "M3", length = 5 }
	14	+aliases = ["ISO 7380 M3x5", "ISO 7380-1 M3x5", "BHCS M3x5", "button head screw M3x5", "M3 x 5 mm"]
	15	+standard = "ISO 7380-1"
	16	+
	17	+[[presets]]
	18	+id = "M3x6"
	19	+title = "M3 × 6"
	20	+params = { size = "M3", length = 6 }
	21	+aliases = ["ISO 7380 M3x6", "ISO 7380-1 M3x6", "BHCS M3x6", "button head screw M3x6", "M3 x 6 mm"]
	22	+standard = "ISO 7380-1"
	23	+
	24	+[[presets]]
	25	+id = "M3x8"
	26	+title = "M3 × 8"
	27	+params = { size = "M3", length = 8 }
	28	+aliases = ["ISO 7380 M3x8", "ISO 7380-1 M3x8", "BHCS M3x8", "button head screw M3x8", "M3 x 8 mm"]
	29	+standard = "ISO 7380-1"
	30	+
	31	+[[presets]]
	32	+id = "M3x10"
	33	+title = "M3 × 10"
	34	+params = { size = "M3", length = 10 }
	35	+aliases = ["ISO 7380 M3x10", "ISO 7380-1 M3x10", "BHCS M3x10", "button head screw M3x10", "M3 x 10 mm"]
	36	+standard = "ISO 7380-1"
	37	+
	38	+[[presets]]
	39	+id = "M3x12"
	40	+title = "M3 × 12"
	41	+params = { size = "M3", length = 12 }
	42	+aliases = ["ISO 7380 M3x12", "ISO 7380-1 M3x12", "BHCS M3x12", "button head screw M3x12", "M3 x 12 mm"]
	43	+standard = "ISO 7380-1"
	44	+
	45	+[[presets]]
	46	+id = "M3x16"
	47	+title = "M3 × 16"
	48	+params = { size = "M3", length = 16 }
	49	+aliases = ["ISO 7380 M3x16", "ISO 7380-1 M3x16", "BHCS M3x16", "button head screw M3x16", "M3 x 16 mm"]
	50	+standard = "ISO 7380-1"
	51	+
	52	+[[presets]]
	53	+id = "M3x20"
	54	+title = "M3 × 20"
	55	+params = { size = "M3", length = 20 }
	56	+aliases = ["ISO 7380 M3x20", "ISO 7380-1 M3x20", "BHCS M3x20", "button head screw M3x20", "M3 x 20 mm"]
	57	+standard = "ISO 7380-1"
	58	+
	59	+[[presets]]
	60	+id = "M3x25"
	61	+title = "M3 × 25"
	62	+params = { size = "M3", length = 25 }
	63	+aliases = ["ISO 7380 M3x25", "ISO 7380-1 M3x25", "BHCS M3x25", "button head screw M3x25", "M3 x 25 mm"]
	64	+standard = "ISO 7380-1"
	65	+
	66	+[[presets]]
	67	+id = "M3x30"
	68	+title = "M3 × 30"
	69	+params = { size = "M3", length = 30 }
	70	+aliases = ["ISO 7380 M3x30", "ISO 7380-1 M3x30", "BHCS M3x30", "button head screw M3x30", "M3 x 30 mm"]
	71	+standard = "ISO 7380-1"
	72	+
	73	+[[presets]]
	74	+id = "M3x35"
	75	+title = "M3 × 35"
	76	+params = { size = "M3", length = 35 }
	77	+aliases = ["ISO 7380 M3x35", "ISO 7380-1 M3x35", "BHCS M3x35", "button head screw M3x35", "M3 x 35 mm"]
	78	+standard = "ISO 7380-1"
	79	+
	80	+[[presets]]
	81	+id = "M3x40"
	82	+title = "M3 × 40"
	83	+params = { size = "M3", length = 40 }
	84	+aliases = ["ISO 7380 M3x40", "ISO 7380-1 M3x40", "BHCS M3x40", "button head screw M3x40", "M3 x 40 mm"]
	85	+standard = "ISO 7380-1"
	86	+
	87	+[[presets]]
	88	+id = "M3x50"
	89	+title = "M3 × 50"
	90	+params = { size = "M3", length = 50 }
	91	+aliases = ["ISO 7380 M3x50", "ISO 7380-1 M3x50", "BHCS M3x50", "button head screw M3x50", "M3 x 50 mm"]
	92	+standard = "ISO 7380-1"
	93	+
	94	+[[presets]]
	95	+id = "M4x4"
	96	+title = "M4 × 4"
	97	+params = { size = "M4", length = 4 }
	98	+aliases = ["ISO 7380 M4x4", "ISO 7380-1 M4x4", "BHCS M4x4", "button head screw M4x4", "M4 x 4 mm"]
	99	+standard = "ISO 7380-1"
	100	+
	101	+[[presets]]
	102	+id = "M4x5"
	103	+title = "M4 × 5"
	104	+params = { size = "M4", length = 5 }
	105	+aliases = ["ISO 7380 M4x5", "ISO 7380-1 M4x5", "BHCS M4x5", "button head screw M4x5", "M4 x 5 mm"]
	106	+standard = "ISO 7380-1"
	107	+
	108	+[[presets]]
	109	+id = "M4x6"
	110	+title = "M4 × 6"
	111	+params = { size = "M4", length = 6 }
	112	+aliases = ["ISO 7380 M4x6", "ISO 7380-1 M4x6", "BHCS M4x6", "button head screw M4x6", "M4 x 6 mm"]
	113	+standard = "ISO 7380-1"
	114	+
	115	+[[presets]]
	116	+id = "M4x8"
	117	+title = "M4 × 8"
	118	+params = { size = "M4", length = 8 }
	119	+aliases = ["ISO 7380 M4x8", "ISO 7380-1 M4x8", "BHCS M4x8", "button head screw M4x8", "M4 x 8 mm"]
	120	+standard = "ISO 7380-1"
	121	+
	122	+[[presets]]
	123	+id = "M4x10"
	124	+title = "M4 × 10"
	125	+params = { size = "M4", length = 10 }
	126	+aliases = ["ISO 7380 M4x10", "ISO 7380-1 M4x10", "BHCS M4x10", "button head screw M4x10", "M4 x 10 mm"]
	127	+standard = "ISO 7380-1"
	128	+
	129	+[[presets]]
	130	+id = "M4x12"
	131	+title = "M4 × 12"
	132	+params = { size = "M4", length = 12 }
	133	+aliases = ["ISO 7380 M4x12", "ISO 7380-1 M4x12", "BHCS M4x12", "button head screw M4x12", "M4 x 12 mm"]
	134	+standard = "ISO 7380-1"
	135	+
	136	+[[presets]]
	137	+id = "M4x16"
	138	+title = "M4 × 16"
	139	+params = { size = "M4", length = 16 }
	140	+aliases = ["ISO 7380 M4x16", "ISO 7380-1 M4x16", "BHCS M4x16", "button head screw M4x16", "M4 x 16 mm"]
	141	+standard = "ISO 7380-1"
	142	+
	143	+[[presets]]
	144	+id = "M4x20"
	145	+title = "M4 × 20"
	146	+params = { size = "M4", length = 20 }
	147	+aliases = ["ISO 7380 M4x20", "ISO 7380-1 M4x20", "BHCS M4x20", "button head screw M4x20", "M4 x 20 mm"]
	148	+standard = "ISO 7380-1"
	149	+
	150	+[[presets]]
	151	+id = "M4x25"
	152	+title = "M4 × 25"
	153	+params = { size = "M4", length = 25 }
	154	+aliases = ["ISO 7380 M4x25", "ISO 7380-1 M4x25", "BHCS M4x25", "button head screw M4x25", "M4 x 25 mm"]
	155	+standard = "ISO 7380-1"
	156	+
	157	+[[presets]]
	158	+id = "M4x30"
	159	+title = "M4 × 30"
	160	+params = { size = "M4", length = 30 }
	161	+aliases = ["ISO 7380 M4x30", "ISO 7380-1 M4x30", "BHCS M4x30", "button head screw M4x30", "M4 x 30 mm"]
	162	+standard = "ISO 7380-1"
	163	+
	164	+[[presets]]
	165	+id = "M4x35"
	166	+title = "M4 × 35"
	167	+params = { size = "M4", length = 35 }
	168	+aliases = ["ISO 7380 M4x35", "ISO 7380-1 M4x35", "BHCS M4x35", "button head screw M4x35", "M4 x 35 mm"]
	169	+standard = "ISO 7380-1"
	170	+
	171	+[[presets]]
	172	+id = "M4x40"
	173	+title = "M4 × 40"
	174	+params = { size = "M4", length = 40 }
	175	+aliases = ["ISO 7380 M4x40", "ISO 7380-1 M4x40", "BHCS M4x40", "button head screw M4x40", "M4 x 40 mm"]
	176	+standard = "ISO 7380-1"
	177	+
	178	+[[presets]]
	179	+id = "M4x50"
	180	+title = "M4 × 50"
	181	+params = { size = "M4", length = 50 }
	182	+aliases = ["ISO 7380 M4x50", "ISO 7380-1 M4x50", "BHCS M4x50", "button head screw M4x50", "M4 x 50 mm"]
	183	+standard = "ISO 7380-1"
	184	+
	185	+[[presets]]
	186	+id = "M5x4"
	187	+title = "M5 × 4"
	188	+params = { size = "M5", length = 4 }
	189	+aliases = ["ISO 7380 M5x4", "ISO 7380-1 M5x4", "BHCS M5x4", "button head screw M5x4", "M5 x 4 mm"]
	190	+standard = "ISO 7380-1"
	191	+
	192	+[[presets]]
	193	+id = "M5x5"
	194	+title = "M5 × 5"
	195	+params = { size = "M5", length = 5 }
	196	+aliases = ["ISO 7380 M5x5", "ISO 7380-1 M5x5", "BHCS M5x5", "button head screw M5x5", "M5 x 5 mm"]
	197	+standard = "ISO 7380-1"
	198	+
	199	+[[presets]]
	200	+id = "M5x6"
	201	+title = "M5 × 6"
	202	+params = { size = "M5", length = 6 }
	203	+aliases = ["ISO 7380 M5x6", "ISO 7380-1 M5x6", "BHCS M5x6", "button head screw M5x6", "M5 x 6 mm"]
	204	+standard = "ISO 7380-1"
	205	+
	206	+[[presets]]
	207	+id = "M5x8"
	208	+title = "M5 × 8"
	209	+params = { size = "M5", length = 8 }
	210	+aliases = ["ISO 7380 M5x8", "ISO 7380-1 M5x8", "BHCS M5x8", "button head screw M5x8", "M5 x 8 mm"]
	211	+standard = "ISO 7380-1"
	212	+
	213	+[[presets]]
	214	+id = "M5x10"
	215	+title = "M5 × 10"
	216	+params = { size = "M5", length = 10 }
	217	+aliases = ["ISO 7380 M5x10", "ISO 7380-1 M5x10", "BHCS M5x10", "button head screw M5x10", "M5 x 10 mm"]
	218	+standard = "ISO 7380-1"
	219	+
	220	+[[presets]]
	221	+id = "M5x12"
	222	+title = "M5 × 12"
	223	+params = { size = "M5", length = 12 }
	224	+aliases = ["ISO 7380 M5x12", "ISO 7380-1 M5x12", "BHCS M5x12", "button head screw M5x12", "M5 x 12 mm"]
	225	+standard = "ISO 7380-1"
	226	+
	227	+[[presets]]
	228	+id = "M5x16"
	229	+title = "M5 × 16"
	230	+params = { size = "M5", length = 16 }
	231	+aliases = ["ISO 7380 M5x16", "ISO 7380-1 M5x16", "BHCS M5x16", "button head screw M5x16", "M5 x 16 mm"]
	232	+standard = "ISO 7380-1"
	233	+
	234	+[[presets]]
	235	+id = "M5x20"
	236	+title = "M5 × 20"
	237	+params = { size = "M5", length = 20 }
	238	+aliases = ["ISO 7380 M5x20", "ISO 7380-1 M5x20", "BHCS M5x20", "button head screw M5x20", "M5 x 20 mm"]
	239	+standard = "ISO 7380-1"
	240	+
	241	+[[presets]]
	242	+id = "M5x25"
	243	+title = "M5 × 25"
	244	+params = { size = "M5", length = 25 }
	245	+aliases = ["ISO 7380 M5x25", "ISO 7380-1 M5x25", "BHCS M5x25", "button head screw M5x25", "M5 x 25 mm"]
	246	+standard = "ISO 7380-1"
	247	+
	248	+[[presets]]
	249	+id = "M5x30"
	250	+title = "M5 × 30"
	251	+params = { size = "M5", length = 30 }
	252	+aliases = ["ISO 7380 M5x30", "ISO 7380-1 M5x30", "BHCS M5x30", "button head screw M5x30", "M5 x 30 mm"]
	253	+standard = "ISO 7380-1"
	254	+
	255	+[[presets]]
	256	+id = "M5x35"
	257	+title = "M5 × 35"
	258	+params = { size = "M5", length = 35 }
	259	+aliases = ["ISO 7380 M5x35", "ISO 7380-1 M5x35", "BHCS M5x35", "button head screw M5x35", "M5 x 35 mm"]
	260	+standard = "ISO 7380-1"
	261	+
	262	+[[presets]]
	263	+id = "M5x40"
	264	+title = "M5 × 40"
	265	+params = { size = "M5", length = 40 }
	266	+aliases = ["ISO 7380 M5x40", "ISO 7380-1 M5x40", "BHCS M5x40", "button head screw M5x40", "M5 x 40 mm"]
	267	+standard = "ISO 7380-1"
	268	+
	269	+[[presets]]
	270	+id = "M5x50"
	271	+title = "M5 × 50"
	272	+params = { size = "M5", length = 50 }
	273	+aliases = ["ISO 7380 M5x50", "ISO 7380-1 M5x50", "BHCS M5x50", "button head screw M5x50", "M5 x 50 mm"]
	274	+standard = "ISO 7380-1"
	275	+
	276	+[[presets]]
	277	+id = "M6x4"
	278	+title = "M6 × 4"
	279	+params = { size = "M6", length = 4 }
	280	+aliases = ["ISO 7380 M6x4", "ISO 7380-1 M6x4", "BHCS M6x4", "button head screw M6x4", "M6 x 4 mm"]
	281	+standard = "ISO 7380-1"
	282	+
	283	+[[presets]]
	284	+id = "M6x5"
	285	+title = "M6 × 5"
	286	+params = { size = "M6", length = 5 }
	287	+aliases = ["ISO 7380 M6x5", "ISO 7380-1 M6x5", "BHCS M6x5", "button head screw M6x5", "M6 x 5 mm"]
	288	+standard = "ISO 7380-1"
	289	+
	290	+[[presets]]
	291	+id = "M6x6"
	292	+title = "M6 × 6"
	293	+params = { size = "M6", length = 6 }
	294	+aliases = ["ISO 7380 M6x6", "ISO 7380-1 M6x6", "BHCS M6x6", "button head screw M6x6", "M6 x 6 mm"]
	295	+standard = "ISO 7380-1"
	296	+
	297	+[[presets]]
	298	+id = "M6x8"
	299	+title = "M6 × 8"
	300	+params = { size = "M6", length = 8 }
	301	+aliases = ["ISO 7380 M6x8", "ISO 7380-1 M6x8", "BHCS M6x8", "button head screw M6x8", "M6 x 8 mm"]
	302	+standard = "ISO 7380-1"
	303	+
	304	+[[presets]]
	305	+id = "M6x10"
	306	+title = "M6 × 10"
	307	+params = { size = "M6", length = 10 }
	308	+aliases = ["ISO 7380 M6x10", "ISO 7380-1 M6x10", "BHCS M6x10", "button head screw M6x10", "M6 x 10 mm"]
	309	+standard = "ISO 7380-1"
	310	+
	311	+[[presets]]
	312	+id = "M6x12"
	313	+title = "M6 × 12"
	314	+params = { size = "M6", length = 12 }
	315	+aliases = ["ISO 7380 M6x12", "ISO 7380-1 M6x12", "BHCS M6x12", "button head screw M6x12", "M6 socket button head screw", "ISO7380 M6x12"]
	316	+standard = "ISO 7380-1"
	317	+
	318	+[[presets]]
	319	+id = "M6x16"
	320	+title = "M6 × 16"
	321	+params = { size = "M6", length = 16 }
	322	+aliases = ["ISO 7380 M6x16", "ISO 7380-1 M6x16", "BHCS M6x16", "button head screw M6x16", "M6 x 16 mm"]
	323	+standard = "ISO 7380-1"
	324	+
	325	+[[presets]]
	326	+id = "M6x20"
	327	+title = "M6 × 20"
	328	+params = { size = "M6", length = 20 }
	329	+aliases = ["ISO 7380 M6x20", "ISO 7380-1 M6x20", "BHCS M6x20", "button head screw M6x20", "M6 x 20 mm"]
	330	+standard = "ISO 7380-1"
	331	+
	332	+[[presets]]
	333	+id = "M6x25"
	334	+title = "M6 × 25"
	335	+params = { size = "M6", length = 25 }
	336	+aliases = ["ISO 7380 M6x25", "ISO 7380-1 M6x25", "BHCS M6x25", "button head screw M6x25", "M6 x 25 mm"]
	337	+standard = "ISO 7380-1"
	338	+
	339	+[[presets]]
	340	+id = "M6x30"
	341	+title = "M6 × 30"
	342	+params = { size = "M6", length = 30 }
	343	+aliases = ["ISO 7380 M6x30", "ISO 7380-1 M6x30", "BHCS M6x30", "button head screw M6x30", "M6 x 30 mm"]
	344	+standard = "ISO 7380-1"
	345	+
	346	+[[presets]]
	347	+id = "M6x35"
	348	+title = "M6 × 35"
	349	+params = { size = "M6", length = 35 }
	350	+aliases = ["ISO 7380 M6x35", "ISO 7380-1 M6x35", "BHCS M6x35", "button head screw M6x35", "M6 x 35 mm"]
	351	+standard = "ISO 7380-1"
	352	+
	353	+[[presets]]
	354	+id = "M6x40"
	355	+title = "M6 × 40"
	356	+params = { size = "M6", length = 40 }
	357	+aliases = ["ISO 7380 M6x40", "ISO 7380-1 M6x40", "BHCS M6x40", "button head screw M6x40", "M6 x 40 mm"]
	358	+standard = "ISO 7380-1"
	359	+
	360	+[[presets]]
	361	+id = "M6x50"
	362	+title = "M6 × 50"
	363	+params = { size = "M6", length = 50 }
	364	+aliases = ["ISO 7380 M6x50", "ISO 7380-1 M6x50", "BHCS M6x50", "button head screw M6x50", "M6 x 50 mm"]
	365	+standard = "ISO 7380-1"
	366	+
	367	+[[presets]]
	368	+id = "M8x4"
	369	+title = "M8 × 4"
	370	+params = { size = "M8", length = 4 }
	371	+aliases = ["ISO 7380 M8x4", "ISO 7380-1 M8x4", "BHCS M8x4", "button head screw M8x4", "M8 x 4 mm"]
	372	+standard = "ISO 7380-1"
	373	+
	374	+[[presets]]
	375	+id = "M8x5"
	376	+title = "M8 × 5"
	377	+params = { size = "M8", length = 5 }
	378	+aliases = ["ISO 7380 M8x5", "ISO 7380-1 M8x5", "BHCS M8x5", "button head screw M8x5", "M8 x 5 mm"]
	379	+standard = "ISO 7380-1"
	380	+
	381	+[[presets]]
	382	+id = "M8x6"
	383	+title = "M8 × 6"
	384	+params = { size = "M8", length = 6 }
	385	+aliases = ["ISO 7380 M8x6", "ISO 7380-1 M8x6", "BHCS M8x6", "button head screw M8x6", "M8 x 6 mm"]
	386	+standard = "ISO 7380-1"
	387	+
	388	+[[presets]]
	389	+id = "M8x8"
	390	+title = "M8 × 8"
	391	+params = { size = "M8", length = 8 }
	392	+aliases = ["ISO 7380 M8x8", "ISO 7380-1 M8x8", "BHCS M8x8", "button head screw M8x8", "M8 x 8 mm"]
	393	+standard = "ISO 7380-1"
	394	+
	395	+[[presets]]
	396	+id = "M8x10"
	397	+title = "M8 × 10"
	398	+params = { size = "M8", length = 10 }
	399	+aliases = ["ISO 7380 M8x10", "ISO 7380-1 M8x10", "BHCS M8x10", "button head screw M8x10", "M8 x 10 mm"]
	400	+standard = "ISO 7380-1"
	401	+
	402	+[[presets]]
	403	+id = "M8x12"
	404	+title = "M8 × 12"
	405	+params = { size = "M8", length = 12 }
	406	+aliases = ["ISO 7380 M8x12", "ISO 7380-1 M8x12", "BHCS M8x12", "button head screw M8x12", "M8 x 12 mm"]
	407	+standard = "ISO 7380-1"
	408	+
	409	+[[presets]]
	410	+id = "M8x16"
	411	+title = "M8 × 16"
	412	+params = { size = "M8", length = 16 }
	413	+aliases = ["ISO 7380 M8x16", "ISO 7380-1 M8x16", "BHCS M8x16", "button head screw M8x16", "M8 x 16 mm"]
	414	+standard = "ISO 7380-1"
	415	+
	416	+[[presets]]
	417	+id = "M8x20"
	418	+title = "M8 × 20"
	419	+params = { size = "M8", length = 20 }
	420	+aliases = ["ISO 7380 M8x20", "ISO 7380-1 M8x20", "BHCS M8x20", "button head screw M8x20", "M8 x 20 mm"]
	421	+standard = "ISO 7380-1"
	422	+
	423	+[[presets]]
	424	+id = "M8x25"
	425	+title = "M8 × 25"
	426	+params = { size = "M8", length = 25 }
	427	+aliases = ["ISO 7380 M8x25", "ISO 7380-1 M8x25", "BHCS M8x25", "button head screw M8x25", "M8 x 25 mm"]
	428	+standard = "ISO 7380-1"
	429	+
	430	+[[presets]]
	431	+id = "M8x30"
	432	+title = "M8 × 30"
	433	+params = { size = "M8", length = 30 }
	434	+aliases = ["ISO 7380 M8x30", "ISO 7380-1 M8x30", "BHCS M8x30", "button head screw M8x30", "M8 x 30 mm"]
	435	+standard = "ISO 7380-1"
	436	+
	437	+[[presets]]
	438	+id = "M8x35"
	439	+title = "M8 × 35"
	440	+params = { size = "M8", length = 35 }
	441	+aliases = ["ISO 7380 M8x35", "ISO 7380-1 M8x35", "BHCS M8x35", "button head screw M8x35", "M8 x 35 mm"]
	442	+standard = "ISO 7380-1"
	443	+
	444	+[[presets]]
	445	+id = "M8x40"
	446	+title = "M8 × 40"
	447	+params = { size = "M8", length = 40 }
	448	+aliases = ["ISO 7380 M8x40", "ISO 7380-1 M8x40", "BHCS M8x40", "button head screw M8x40", "M8 x 40 mm"]
	449	+standard = "ISO 7380-1"
	450	+
	451	+[[presets]]
	452	+id = "M8x50"
	453	+title = "M8 × 50"
	454	+params = { size = "M8", length = 50 }
	455	+aliases = ["ISO 7380 M8x50", "ISO 7380-1 M8x50", "BHCS M8x50", "button head screw M8x50", "M8 x 50 mm"]
	456	+standard = "ISO 7380-1"
	457	+

README.md added in 2.0.0

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		@@ -1,0 +1,47 @@
	1	+# Button head screw (ISO 7380-1)
	2	+
	3	+Hexagon socket button head screw, metric coarse thread, M3 to M16, at any length. Presets cover the common catalogue
	4	+sizes (M3 × 6, M5 × 10, ...).
	5	+
	6	+## Geometry
	7	+
	8	+Envelope for assemblies and clearance checks:
	9	+
	10	+- domed head: a spherical cap of diameter **dk max** and height **k max** (the standard's head radius is a reference
	11	+ value; the cap through the rim and the top is used);
	12	+- hexagon socket, key size **s** (nominal), depth **t min**, flat bottom;
	13	+- plain shank at the nominal thread diameter **d**, length **l** (`length`); the thread is not modelled.
	14	+
	15	+The head's bearing face is on the XY plane at the origin, the head above it, the shank along -Z.
	16	+
	17	+## Parameters
	18	+
	19	+| Parameter | Meaning |
	20	+|---|---|
	21	+| `size` | Thread size, M3 to M16 |
	22	+| `length` | Nominal length l under the head, mm |
	23	+| `material` | `steel` (property class 10.9 / 12.9, black oxide), `stainless-a2`, `stainless-a4` (ISO 3506-1) |
	24	+
	25	+## Source
	26	+
	27	+ISO 7380-1:2011, *Button head screws — Part 1: Hexagon socket button head screws*, Table 1, p. 3: d, dk max, k max,
	28	+s (nominal), t min, read from the official preview
	29	+(<https://cdn.standards.iteh.ai/samples/53671/84df01c5fcce4a91896ac3b0c55ca128/ISO-7380-1-2011.pdf>) and fasten.it's
	30	+DIN EN ISO 7380-1:2011-11 (<https://fasten.it/en/Norms/Norm/DIN%20EN%20ISO%207380-1>). The current edition,
	31	+ISO 7380-1:2022, Table 1, p. 4
	32	+(<https://cdn.standards.iteh.ai/samples/78699/a175805085534f98983d6c8aa583a5b0/ISO-7380-1-2022.pdf>), has the same
	33	+dk max, k max, s and t min (it adds t max and changes dw and e, which this model doesn't use).
	34	+
	35	+| Size | dk | k | s | t |
	36	+|---|---|---|---|---|
	37	+| M3 | 5.7 | 1.65 | 2.0 | 1.04 |
	38	+| M4 | 7.6 | 2.2 | 2.5 | 1.3 |
	39	+| M5 | 9.5 | 2.75 | 3.0 | 1.56 |
	40	+| M6 | 10.5 | 3.3 | 4.0 | 2.08 |
	41	+| M8 | 14.0 | 4.4 | 5.0 | 2.6 |
	42	+| M10 | 17.5 | 5.5 | 6.0 | 3.12 |
	43	+| M12 | 21.0 | 6.6 | 8.0 | 4.16 |
	44	+| M16 | 28.0 | 8.8 | 10.0 | 5.2 |
	45	+
	46	+Preset list: sizes and lengths of the step.parts catalogue (MIT), see `library/NOTICE.md`.
	47	+