feat(task-8): ISO fastener and ISO 15 bearing tables, transcribed and pinned

engineering/mech/standards/fasteners.py carries ISO 4014:2011 / ISO 4017:2014 head dimensions (s, k), ISO 4032:2012 nut heights, ISO 7089:2000 washer d1/d2/h and ISO 4762:2004 socket head cap screws, plus the ISO 261:1998 coarse pitch column. bearings.py carries the ISO 15:2017 deep groove boundary dimensions for 6000-6010, 6200-6210 and 6300-6310. Only the ISO 261 first-choice sizes ship. M14/M18/M22/M27/M33, everything above M36 (above M24 for ISO 4762), the 618x/619x/16xx bearing series, bore numbers above 10 and every suffixed bearing variant are refused by name rather than interpolated: a narrow table is merely narrow, a wrong row ships a wrong workshop drawing. Across-corners e is derived geometry (2s/sqrt(3)), so no e column had to be transcribed at all, and the ISO 8826-1 cross and ISO 8826-2 element-symbol fractions are declared drawing conventions, not table values. No ActiveX member is called by this task, so no live AutoCAD probe was needed; the two modules are pure tables and pure arithmetic. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd
2026-09-22 18:53:17 +03:00
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+"""ISO 15 boundary dimensions and the ISO 8826 representation conventions."""
+
+from __future__ import annotations
+
+import pytest
+
+from engineering.mech.standards import standards
+from engineering.mech.standards.bearings import (
+    BALL_SYMBOL_FRACTION,
+    BEARING_SERIES,
+    CROSS_FRACTION,
+    DEEP_GROOVE,
+    SOURCE_ISO_15,
+    SOURCE_ISO_8826_1,
+    SOURCE_ISO_8826_2,
+    bearing,
+    list_bearings,
+)
+
+
+@pytest.mark.parametrize(
+    ("designation", "bore", "outer", "width"),
+    [
+        ("6000", 10.0, 26.0, 8.0),
+        ("6004", 20.0, 42.0, 12.0),
+        ("6006", 30.0, 55.0, 13.0),
+        ("6010", 50.0, 80.0, 16.0),
+        ("6200", 10.0, 30.0, 9.0),
+        ("6203", 17.0, 40.0, 12.0),
+        ("6205", 25.0, 52.0, 15.0),
+        ("6208", 40.0, 80.0, 18.0),
+        ("6210", 50.0, 90.0, 20.0),
+        ("6300", 10.0, 35.0, 11.0),
+        ("6305", 25.0, 62.0, 17.0),
+        ("6309", 45.0, 100.0, 25.0),
+        ("6310", 50.0, 110.0, 27.0),
+    ],
+)
+def test_named_rows_match_iso15(designation, bore, outer, width):
+    row = bearing(designation)
+    assert (row["d"], row["D"], row["B"]) == (bore, outer, width)
+    assert row["designation"] == designation
+    assert row["source"] == SOURCE_ISO_15
+
+
+def test_bore_number_rule_holds_across_every_series():
+    """ISO 15: bore 00/01/02/03 = 10/12/15/17 mm; 04 and up = 5 x bore number."""
+    for series in ("60", "62", "63"):
+        assert bearing(f"{series}00")["d"] == 10.0
+        assert bearing(f"{series}01")["d"] == 12.0
+        assert bearing(f"{series}02")["d"] == 15.0
+        assert bearing(f"{series}03")["d"] == 17.0
+        for n in range(4, 11):
+            assert bearing(f"{series}{n:02d}")["d"] == 5.0 * n
+
+
+def test_outside_diameter_and_width_grow_with_the_series():
+    for n in range(0, 11):
+        light = bearing(f"60{n:02d}")
+        medium = bearing(f"62{n:02d}")
+        heavy = bearing(f"63{n:02d}")
+        assert light["d"] == medium["d"] == heavy["d"]
+        assert light["D"] < medium["D"] < heavy["D"]
+        assert light["B"] < medium["B"] < heavy["B"]
+
+
+def test_coverage_refusals_name_the_table():
+    with pytest.raises(ValueError, match="ISO 15"):
+        bearing("6011")
+    with pytest.raises(ValueError, match="ISO 15"):
+        bearing("6211")
+    with pytest.raises(ValueError, match="ISO 15"):
+        bearing("6311")
+    with pytest.raises(ValueError, match="ISO 15"):
+        bearing("61805")  # the 618x light series is not transcribed
+    with pytest.raises(ValueError, match="ISO 15"):
+        bearing("6205-2RS")  # a seal suffix is a variant this table does not carry
+
+
+def test_representation_fractions_are_declared_conventions_not_table_values():
+    assert 0.0 < CROSS_FRACTION < 1.0
+    assert 0.0 < BALL_SYMBOL_FRACTION < 1.0
+    assert "ISO 8826-1" in SOURCE_ISO_8826_1
+    assert "ISO 8826-2" in SOURCE_ISO_8826_2
+    assert "ISO 15:2017" in SOURCE_ISO_15
+
+
+def test_the_element_symbol_always_fits_inside_the_ring_rectangle():
+    """The declared fractions must never draw a symbol outside the envelope."""
+    for name in DEEP_GROOVE:
+        row = bearing(name)
+        half_width = row["B"] / 2.0
+        half_gap = (row["D"] - row["d"]) / 4.0
+        assert BALL_SYMBOL_FRACTION * half_gap < half_width
+        assert CROSS_FRACTION * half_width < half_width
+        assert CROSS_FRACTION * half_gap < half_gap
+
+
+def test_list_bearings_filters_by_series():
+    assert len(DEEP_GROOVE) == 33
+    assert len(list_bearings()) == 33
+    assert BEARING_SERIES == ("600x", "620x", "630x")
+    assert {row["designation"] for row in list_bearings("620x")} == {
+        f"62{n:02d}" for n in range(11)
+    }
+    with pytest.raises(ValueError, match="620x"):
+        list_bearings("622x")
+
+
+def test_the_table_registers_itself():
+    assert "ISO 15" in standards()