diff --git a/docs/reference/sheet.md b/docs/reference/sheet.md
index f67e2751..5ad04b45 100644
--- a/docs/reference/sheet.md
+++ b/docs/reference/sheet.md
@@ -867,6 +867,10 @@ A location intent's precision applies to all its selected directional values, in
 side-drilled holes and slots. The policy survives generated-script replay. When several
 location intents share one coincident mark, give them matching display precision; incompatible
 printed values raise an actionable error instead of silently choosing one intent's label.
+For a diameter that references an imported knurl maximum, the numeric value sets a
+minimum number of decimal places: `format(decimals=1)` cannot print `ø10.05` as
+`ø10.1`. The numeric PMI fields are floats; this policy does not preserve trailing
+zeroes from the retained source prose.
 
 
 ::: draftwright.sheet.DimensionIntent
diff --git a/src/draftwright/linting/pmi_coverage.py b/src/draftwright/linting/pmi_coverage.py
index cb7e466b..dee2439a 100644
--- a/src/draftwright/linting/pmi_coverage.py
+++ b/src/draftwright/linting/pmi_coverage.py
@@ -9,11 +9,27 @@
 
 from build123d import Align, Location, Mode, Sketch, Text
 
+from draftwright._geometry import _fmt_pmi_magnitude
 from draftwright.linting.issues import LintIssue
 from draftwright.pmi import PmiExtractionReport
 
 _SUPPORTED_MANUFACTURING_REQUIREMENTS = frozenset(("external_thread", "internal_thread", "knurl"))
 _MANUFACTURING_REF = re.compile(r"\bSEE (MFG [1-9][0-9]*)\b")
+_DIAMETER_TOKEN = re.compile(r"ø(\d+(?:\.\d+)?)")
+_KNURL_MAX_TOKEN = re.compile(r"ø(\d+(?:\.\d+)?)\s+MAX AFTER KNURL\b")
+
+
+def _source_knurl_max_is_visible(label: str, printed: str, aspect) -> bool:
+    """Judge source maximum ink independently of the row's callout formatter."""
+    maximum = getattr(aspect, "maximum_diameter", None)
+    if maximum is None:
+        return True
+    expected = Decimal(_fmt_pmi_magnitude(maximum))
+    row_match = _KNURL_MAX_TOKEN.search(printed)
+    if row_match is None or Decimal(row_match.group(1)) != expected:
+        return False
+    leader_match = _DIAMETER_TOKEN.search(label)
+    return leader_match is not None and Decimal(leader_match.group(1)) == expected
 
 
 def _title_value_has_finished_ink(title, field: str, value: str) -> bool:
@@ -101,7 +117,9 @@ def lint_manufacturing_references(registry) -> list[LintIssue]:
             claimed_sources = set(source_ids_by_tag.get(tag, ()))
             printed = " ".join(rows_by_tag.get(tag, ()))
             complete = bool(printed and claimed_sources) and any(
-                claimed_sources == set(aspect.source_ids) and printed == aspect.callout_suffix
+                claimed_sources == set(aspect.source_ids)
+                and printed == aspect.callout_text
+                and _source_knurl_max_is_visible(label, printed, aspect)
                 for aspect in aspects
             )
             if complete:
diff --git a/src/draftwright/model/compiled.py b/src/draftwright/model/compiled.py
index 72ee863e..4cd18889 100644
--- a/src/draftwright/model/compiled.py
+++ b/src/draftwright/model/compiled.py
@@ -51,9 +51,15 @@
 
 from collections.abc import Iterable
 from dataclasses import dataclass, field, replace
-from typing import Any, Literal
-
-from draftwright._geometry import _fmt, _fmt_angle, _fmt_chamfer, _fmt_tolerance
+from typing import Any, Literal, cast
+
+from draftwright._geometry import (
+    _fmt,
+    _fmt_angle,
+    _fmt_chamfer,
+    _fmt_pmi_magnitude,
+    _fmt_tolerance,
+)
 from draftwright.fits import FitClass
 from draftwright.measurement_support import coincident_location_axes
 from draftwright.model.callout import resolved_through_indicator
@@ -64,6 +70,7 @@
     EnvelopeFeature,
     Feature,
     HoleFeature,
+    KnurlRequirement,
     Note,
     PadFeature,
     PartModel,
@@ -1814,6 +1821,42 @@ def _dimension_witness_span(feature, parameter):
     )
 
 
+def _group_display_decimals(feature, planned) -> int | None:
+    """Avoid rounding a knurl maximum beyond the table's numeric precision."""
+    knurl = getattr(feature, "knurl", None)
+    if (
+        planned.param.kind == "diameter"
+        and isinstance(knurl, KnurlRequirement)
+        and knurl.source == "ap242_pmi"
+        and knurl.maximum_diameter is not None
+    ):
+        # The schedule prints the imported maximum, which can differ slightly
+        # from the recognized solid and must survive a coarser authored policy.
+        source_places = len(_fmt_pmi_magnitude(knurl.maximum_diameter).partition(".")[2])
+        requested_places = cast(int | None, planned.display_decimals)
+        return max(source_places, requested_places or 0)
+    return cast(int | None, planned.display_decimals)
+
+
+def _group_value_text(feature, planned, flat_auto_decimals: int | None) -> str:
+    """Keep a source knurl's maximum readable in its approved diameter callout."""
+    decimals = _group_display_decimals(feature, planned)
+    knurl = getattr(feature, "knurl", None)
+    if (
+        planned.param.kind == "diameter"
+        and isinstance(knurl, KnurlRequirement)
+        and knurl.source == "ap242_pmi"
+        and knurl.maximum_diameter is not None
+    ):
+        return _fmt_pmi_magnitude(knurl.maximum_diameter, decimals)
+    decimals = (
+        planned.display_decimals
+        if planned.display_decimals is not None or feature.kind != "flat"
+        else flat_auto_decimals
+    )
+    return _fmt(planned.param.value, decimals)
+
+
 def _compile_groups(
     planned, *, restore_width: bool = False
 ) -> tuple[list[ApprovedGroup], list[Omission]]:
@@ -1884,12 +1927,7 @@ def _compile_groups(
                 id=DimensionId(g.feature, pd.param.parameter_id),
                 # DimParameter.value is a required float. Keep that invariant explicit at
                 # the boundary instead of implying a nullable state renderers cannot handle.
-                value_text=_fmt(
-                    pd.param.value,
-                    pd.display_decimals
-                    if pd.display_decimals is not None or g.feature_kind != "flat"
-                    else flat_auto_decimals,
-                ),
+                value_text=_group_value_text(g.feature, pd, flat_auto_decimals),
                 value=float(pd.param.value),
                 span=_dimension_witness_span(g.feature, pd.param),
                 ref=FeatureRef(g.feature),
@@ -1904,7 +1942,7 @@ def _compile_groups(
                     if pd.param.angular_reference is not None
                     else None
                 ),
-                display_decimals=pd.display_decimals,
+                display_decimals=_group_display_decimals(g.feature, pd),
                 view=pd.view,
                 side=pd.side,
                 lane=pd.lane,
diff --git a/src/draftwright/model/ir.py b/src/draftwright/model/ir.py
index 2e265612..52c3aac0 100644
--- a/src/draftwright/model/ir.py
+++ b/src/draftwright/model/ir.py
@@ -2597,7 +2597,9 @@ class RequestedDimension:
     discriminator: str | None = None
     #: Explicit display precision for this referential dimension.  The numeric value and
     #: identity still come from ``feature``; this controls only the compiler-owned text at
-    #: the rendering boundary (#1349).  ``None`` preserves the existing automatic formatting.
+    #: the rendering boundary (#1349). ``None`` preserves automatic formatting.
+    #: An imported knurl's numeric maximum sets a minimum number of decimal places,
+    #: so a coarser request cannot round its referenced diameter away from that value.
     display_decimals: int | None = None
     #: Optional semantic projection/strip preference. The planner validates renderer
     #: compatibility; the placement engine still owns coordinates.
diff --git a/src/draftwright/model/ir_foundation.py b/src/draftwright/model/ir_foundation.py
index ab4524f4..820c4a5b 100644
--- a/src/draftwright/model/ir_foundation.py
+++ b/src/draftwright/model/ir_foundation.py
@@ -13,6 +13,7 @@
 from draftwright import contract_values
 from draftwright._geometry import (
     _fmt,
+    _fmt_pmi_magnitude,
     plane_axes,
 )
 from draftwright.feature_identity import (
@@ -538,6 +539,11 @@ def callout_suffix(self) -> str:
             terms.append(f"{_fmt(self.drill_point_angle)}° CONVENTIONAL DRILL POINT")
         return "; ".join(terms)
 
+    @property
+    def callout_text(self) -> str:
+        """Complete thread text when no feature diameter precedes it."""
+        return self.callout_suffix
+
 
 @dataclass(frozen=True)
 class ThreadOperation:
@@ -629,16 +635,23 @@ def callout_suffix(self) -> str:
         terms = []
         if self.maximum_diameter is not None:
             terms.append("MAX AFTER KNURL")
-        knurl = f"{self.pattern.upper()} KNURL P{_fmt(self.pitch)}"
+        knurl = f"{self.pattern.upper()} KNURL P{_fmt_pmi_magnitude(self.pitch)}"
         if self.full_width:
             knurl += " FULL WIDTH"
             if self.edge_chamfer is not None:
-                knurl += f" TO C{_fmt(self.edge_chamfer)} CHAMFERS"
+                knurl += f" TO C{_fmt_pmi_magnitude(self.edge_chamfer)} CHAMFERS"
         terms.append(knurl)
         if self.processes:
             terms.append("/".join(process.upper() for process in self.processes) + " PERMITTED")
         return "; ".join(terms)
 
+    @property
+    def callout_text(self) -> str:
+        """Complete knurl text when no feature diameter precedes it."""
+        if self.maximum_diameter is None:
+            return self.callout_suffix
+        return f"ø{_fmt_pmi_magnitude(self.maximum_diameter)} {self.callout_suffix}"
+
 
 def display(p: DimParameter) -> str:
     """A font-safe text form of a parameter (uses only glyphs the pinned font has;
diff --git a/src/draftwright/model/manufacturing_schedule.py b/src/draftwright/model/manufacturing_schedule.py
index 006a135c..429623a4 100644
--- a/src/draftwright/model/manufacturing_schedule.py
+++ b/src/draftwright/model/manufacturing_schedule.py
@@ -56,7 +56,7 @@ def owners(self) -> tuple[object, ...]:
     def rows(self) -> tuple[tuple[str, str], ...]:
         rows = [("REF", "MANUFACTURING REQUIREMENT")]
         for entry in self.entries:
-            for index, line in enumerate(_wrap_requirement(entry.requirement.callout_suffix)):
+            for index, line in enumerate(_wrap_requirement(entry.requirement.callout_text)):
                 rows.append((entry.tag if index == 0 else "", line))
         return tuple(rows)
 
diff --git a/src/draftwright/sheet.py b/src/draftwright/sheet.py
index 704975ca..cb1af2a3 100644
--- a/src/draftwright/sheet.py
+++ b/src/draftwright/sheet.py
@@ -645,7 +645,9 @@ def format(self, *, decimals: int) -> DimensionIntent:
         tolerance, suppression and provenance continue to use the feature parameter's numeric
         value and semantic identity.  Automatic dimensions keep their existing formatting
         unless their explicit ``add_dimension`` intent opts in. For a location intent,
-        the policy applies to every selected directional value.
+        the policy applies to every selected directional value. An imported knurl's
+        numeric maximum keeps enough decimal places to avoid rounding that value,
+        even when ``decimals`` requests fewer places.
         """
         if isinstance(decimals, bool) or not isinstance(decimals, int) or not 0 <= decimals <= 15:
             raise ValueError("format(decimals=...) requires an integer from 0 to 15")
diff --git a/tests/_tier_manifest.py b/tests/_tier_manifest.py
index 937e4587..2c0400c8 100644
--- a/tests/_tier_manifest.py
+++ b/tests/_tier_manifest.py
@@ -737,6 +737,7 @@ class ContractGroup:
     "src/draftwright/linting/suggest.py": ("test_lint_suggestions.py",),
     "src/draftwright/model/compiled.py": (
         "test_blind_slot_semantics.py",
+        "test_issue_1298_manufacturing_requirements.py",
         "test_issue_1511_turned_boss_heights.py",
         "test_issue_1517_through_indicator.py",
         "test_issue_1560_envelope_axes.py",
diff --git a/tests/test_issue_1298_manufacturing_requirements.py b/tests/test_issue_1298_manufacturing_requirements.py
index 275f7918..78d73c66 100644
--- a/tests/test_issue_1298_manufacturing_requirements.py
+++ b/tests/test_issue_1298_manufacturing_requirements.py
@@ -29,6 +29,7 @@
     PartModel,
     PatternFeature,
     PmiFeature,
+    RequestedDimension,
     StepFeature,
     ThreadRequirement,
 )
@@ -900,7 +901,7 @@ def test_typed_manufacturing_row_keeps_plain_sibling_diameters_in_the_shared_sol
     assert table.table_rows[0] == ("REF", "MANUFACTURING REQUIREMENT")
     assert " ".join(cell for row in table.table_rows for cell in row if cell) == (
         "REF MANUFACTURING REQUIREMENT MFG 1 M3 x 0.5-6g RH, FULL AVAILABLE LENGTH "
-        "MFG 2 MAX AFTER KNURL; STRAIGHT KNURL P1 FULL WIDTH TO C0.3 CHAMFERS; "
+        "MFG 2 ø10 MAX AFTER KNURL; STRAIGHT KNURL P1 FULL WIDTH TO C0.3 CHAMFERS; "
         "CUT/FORMED PERMITTED"
     )
     knurl_owner = next(
@@ -952,6 +953,16 @@ def test_typed_manufacturing_row_keeps_plain_sibling_diameters_in_the_shared_sol
     } == {("manufacturing_requirement:#2000",)}
     table.table_rows = intact_rows
 
+    table.table_rows = tuple(
+        (tag, requirement.replace("ø10 ", "")) for tag, requirement in intact_rows
+    )
+    assert {
+        issue.source_ids
+        for issue in drawing.lint(physical=False)
+        if issue.code == "manufacturing_reference_unresolved"
+    } == {("manufacturing_requirement:#2008",)}
+    table.table_rows = intact_rows
+
     # A later curation edit must not leave apparently complete short references
     # after removing their full manufacturing carrier.
     drawing.remove("manufacturing_requirements")
@@ -966,6 +977,93 @@ def test_typed_manufacturing_row_keeps_plain_sibling_diameters_in_the_shared_sol
     }
 
 
+@pytest.mark.parametrize("requested_decimals", [None, 1])
+@pytest.mark.parametrize("owner_diameter", [10.05, 10.043])
+def test_source_knurl_maximum_keeps_diameter_precision_in_placed_reference(
+    requested_decimals, owner_diameter, monkeypatch
+):
+    part = Cylinder(owner_diameter / 2, 2, align=(Align.CENTER, Align.CENTER, Align.MIN)).rotate(
+        Axis.Y, 90
+    ) + (
+        Pos(2, 0, 0)
+        * Cylinder(1.5, 20, align=(Align.CENTER, Align.CENTER, Align.MIN)).rotate(Axis.Y, 90)
+    )
+    source_text = KNURL_TEXT.replace("DIA 10 mm", "DIA 10.05 mm")
+    assert "DIA 10.05 mm maximum after knurling" in source_text
+    model = lower_ap242_manufacturing_requirements(
+        PartModel(
+            part.bounding_box(),
+            "x",
+            [
+                _step(owner_diameter, 0, 2),
+                _step(3, 2, 22),
+                _raw(
+                    "knurl",
+                    source_text,
+                    _reference(diameter=10.05, interval=(0.3, 1.7), sense="external"),
+                    "#2008",
+                ),
+                _raw(
+                    "external_thread",
+                    EXTERNAL_TEXT,
+                    _reference(diameter=3, interval=(2.5, 21.5), sense="external"),
+                    "#2000",
+                ),
+            ],
+        )
+    )
+    owner = next(feature for feature in model.features if getattr(feature, "knurl", None))
+    assert owner.knurl.maximum_diameter == 10.05
+    if requested_decimals is not None:
+        model = replace(
+            model,
+            requested_dimensions=(
+                RequestedDimension(owner, "step.diameter", display_decimals=requested_decimals),
+            ),
+        )
+
+    drawing = build_drawing(part, model=model, pmi="annotate", page="A2")
+    assert drawing.get_annotation("m_dia_x0").label == "ø10.05 SEE MFG 2"
+    table = drawing.get_annotation("manufacturing_requirements")
+    assert "ø10.05 MAX AFTER KNURL" in " ".join(cell for _, cell in table.table_rows)
+    assert not [
+        issue
+        for issue in drawing.lint(physical=False)
+        if issue.code == "manufacturing_reference_unresolved"
+    ]
+    if owner_diameter == 10.043 and requested_decimals is None:
+        leader = drawing.get_annotation("m_dia_x0")
+        leader.label = "ø10.04 SEE MFG 2"
+        assert {
+            issue.source_ids
+            for issue in drawing.lint(physical=False)
+            if issue.code == "manufacturing_reference_unresolved"
+        } == {("manufacturing_requirement:#2008",)}
+        leader.label = "SEE MFG 2"
+        assert {
+            issue.source_ids
+            for issue in drawing.lint(physical=False)
+            if issue.code == "manufacturing_reference_unresolved"
+        } == {("manufacturing_requirement:#2008",)}
+        leader.label = "ø10.05 SEE MFG 2"
+
+        # Simulate a formatter regression before a fresh build: comparing the
+        # row with the same formatter would accept a missing source maximum.
+        monkeypatch.setattr(
+            KnurlRequirement, "callout_text", property(lambda self: self.callout_suffix)
+        )
+        table.table_rows = tuple(
+            (tag, text.replace("ø10.05 ", "")) for tag, text in table.table_rows
+        )
+        assert "MAX AFTER KNURL" in " ".join(cell for _, cell in table.table_rows)
+        assert "ø10.05" not in " ".join(cell for _, cell in table.table_rows)
+        assert {
+            issue.source_ids
+            for issue in drawing.lint(physical=False)
+            if issue.code == "manufacturing_reference_unresolved"
+        } == {("manufacturing_requirement:#2008",)}
+
+
 def test_unplaced_manufacturing_table_keeps_complete_direct_labels(monkeypatch):
     align = (Align.CENTER, Align.CENTER, Align.MIN)
     part = Cylinder(5.0, 2.0, align=align).rotate(Axis.Y, 90) + (
@@ -1712,7 +1810,7 @@ def test_exact_grm03_renders_complete_source_owned_manufacturing_drawing_once():
         "REF MANUFACTURING REQUIREMENT "
         "MFG 1 M3 x 0.5-6g RH, FULL AVAILABLE LENGTH "
         "MFG 2 M2 x 0.4-6H RH; 6 MIN FULL THREAD; 118° CONVENTIONAL DRILL POINT "
-        "MFG 3 MAX AFTER KNURL; STRAIGHT KNURL P1 FULL WIDTH TO C0.3 CHAMFERS; "
+        "MFG 3 ø10 MAX AFTER KNURL; STRAIGHT KNURL P1 FULL WIDTH TO C0.3 CHAMFERS; "
         "CUT/FORMED PERMITTED"
     )
     typed_occurrences = []
@@ -1725,6 +1823,10 @@ def test_exact_grm03_renders_complete_source_owned_manufacturing_drawing_once():
         expected_manufacturing
     )
     typed_owners = dict(typed_occurrences)
+    assert (
+        "DIA 10 mm maximum after knurling"
+        in typed_owners["manufacturing_requirement:#2008"].knurl.text
+    )
     for source_id, (expected_name, expected_label) in expected_manufacturing.items():
         owner = typed_owners[source_id]
         matches = [
diff --git a/tests/test_manufacturing_schedule.py b/tests/test_manufacturing_schedule.py
index 2cfd291b..552dae0f 100644
--- a/tests/test_manufacturing_schedule.py
+++ b/tests/test_manufacturing_schedule.py
@@ -44,7 +44,7 @@ def _knurl():
         pattern="straight",
         pitch=1.0,
         full_width=True,
-        text="Straight knurl, full width between C0.3 chamfers",
+        text="Straight knurl, full width between C0.3 chamfers, DIA 10 mm maximum after knurling",
         source_ids=("manufacturing_requirement:#2",),
         part21_id="#2",
         shape_aspect_ids=("#2:aspect",),
@@ -78,7 +78,12 @@ def test_long_imported_requirements_get_stable_complete_keyed_rows():
             by_tag[current] = []
         by_tag[current].append(text)
     for entry in schedule.entries:
-        assert " ".join(by_tag[entry.tag]) == entry.requirement.callout_suffix
+        printed = " ".join(by_tag[entry.tag])
+        if isinstance(entry.requirement, KnurlRequirement):
+            assert "DIA 10 mm maximum after knurling" in entry.requirement.text
+            assert "ø10 MAX AFTER KNURL" in printed
+        else:
+            assert printed == entry.requirement.callout_suffix
 
 
 def test_one_requirement_or_pmi_off_keeps_direct_callouts():
@@ -96,6 +101,21 @@ def test_one_requirement_or_pmi_off_keeps_direct_callouts():
     )
 
 
+def test_knurl_schedule_text_keeps_source_diameter_precision():
+    requirement = replace(
+        _knurl(),
+        maximum_diameter=10.05,
+        pitch=0.25,
+        edge_chamfer=0.05,
+        text="Straight knurl, 0.25 mm pitch, full width between C0.05 chamfers, DIA 10.05 mm maximum after knurling",
+    )
+    assert "0.25 mm pitch, full width between C0.05 chamfers, DIA 10.05 mm" in requirement.text
+    assert (
+        requirement.callout_text
+        == "ø10.05 MAX AFTER KNURL; STRAIGHT KNURL P0.25 FULL WIDTH TO C0.05 CHAMFERS; CUT/FORMED PERMITTED"
+    )
+
+
 def test_long_requirement_wrap_keeps_the_final_phrase_together():
     assert _wrap_requirement(
         "M2 x 0.4-6H RH; 6 MIN FULL THREAD; 118° CONVENTIONAL DRILL POINT"
diff --git a/tests/test_tier_manifest.py b/tests/test_tier_manifest.py
index 8e3e68e3..a0cf3552 100644
--- a/tests/test_tier_manifest.py
+++ b/tests/test_tier_manifest.py
@@ -462,6 +462,11 @@ def test_ir_foundation_change_runs_manufacturing_requirement_contract():
     assert "test_part_model.py" in selected
 
 
+def test_compiled_plan_change_runs_source_knurl_precision_contract():
+    selected = pr_modules(_TESTS, ["src/draftwright/model/compiled.py"])
+    assert "test_issue_1298_manufacturing_requirements.py" in selected
+
+
 def test_pmi_lowering_change_runs_source_diameter_ownership_contract():
     selected = pr_modules(_TESTS, ["src/draftwright/model/pmi_lowering.py"])
     assert "test_issue_1296_cylindrical_diameter_pmi.py" in selected