Knurling specification

A crossed or straight pattern note specifying a gripping surface.

Also known as: Diamond knurl marking, Knurl callout

Engineering & technicalStandard profile

Meanings

Knurling is specified by a note giving the pattern — straight, diagonal or diamond — and the pitch, rather than by drawing every groove. The pattern is drawn on only a small part of the surface as a convention, not because the knurl stops there.

Officially standardisedVerified fact
Specifies a rolled gripping pattern on a cylindrical surface by pattern type and pitch.
Contexts: Technical drawing
Officially standardisedVerified fact
Is drawn over only part of the surface by convention, the note rather than the drawn area defining the extent.
Contexts: Technical drawing

Visual description

A small patch of crossed or straight parallel lines drawn on a cylindrical outline, with a printed note beside it.

Symmetry: none
Orientation: upright

Confidence

IdentityHigh confidence: High confidence because the identity is documented in encyclopedic references, but multiple independent sources agree.
Historical originModerate confidence: Moderate confidence because the historical origin is documented in encyclopedic references, but multiple independent sources agree, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useHigh confidence: High confidence because the current use is documented in encyclopedic references, but multiple independent sources agree.
Visual matchHigh confidence: High confidence because the visual match is documented in encyclopedic references, but multiple independent sources agree.

Sources

ISO 1101, Geometrical product specifications — Geometrical tolerancing
International Organization for Standardization · retrieved 2026-08-01
Paywalled and NOT READ. Registered so records can state which standard governs a symbol — a checkable fact a reader can act on — and for nothing else. It governs the geometric tolerancing symbols and their frames. No meaning in any record is typed `official` on the strength of this entry. See docs/paywalled-standards.md.
Geometric dimensioning and tolerancing
Wikipedia · retrieved 2026-08-01
Tertiary reference. Used for what a symbol instructs and which standard governs it. Where a standard is named it is reported by this source rather than read, so no meaning is typed `official` on that basis.
ISO 128, Technical drawings — General principles of presentation
International Organization for Standardization · retrieved 2026-08-01
Paywalled and NOT READ. Registered so records can state which standard governs a symbol — a checkable fact a reader can act on — and for nothing else. It governs line types, views, sections and projection conventions. No meaning in any record is typed `official` on the strength of this entry. See docs/paywalled-standards.md.

Last reviewed 2026-08-23

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Engineering drawing notation

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Meanings

Officially standardisedVerified fact

Specifies a rolled gripping pattern on a cylindrical surface by pattern type and pitch.

Contexts: Technical drawing

Officially standardisedVerified fact

Is drawn over only part of the surface by convention, the note rather than the drawn area defining the extent.

Contexts: Technical drawing

Confidence

IdentityHigh confidence: High confidence because the identity is documented in encyclopedic references, but multiple independent sources agree.
Historical originModerate confidence: Moderate confidence because the historical origin is documented in encyclopedic references, but multiple independent sources agree, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useHigh confidence: High confidence because the current use is documented in encyclopedic references, but multiple independent sources agree.
Visual matchHigh confidence: High confidence because the visual match is documented in encyclopedic references, but multiple independent sources agree.

Sources

ISO 1101, Geometrical product specifications — Geometrical tolerancing
International Organization for Standardization · retrieved 2026-08-01
Paywalled and NOT READ. Registered so records can state which standard governs a symbol — a checkable fact a reader can act on — and for nothing else. It governs the geometric tolerancing symbols and their frames. No meaning in any record is typed `official` on the strength of this entry. See docs/paywalled-standards.md.
Geometric dimensioning and tolerancing
Wikipedia · retrieved 2026-08-01
Tertiary reference. Used for what a symbol instructs and which standard governs it. Where a standard is named it is reported by this source rather than read, so no meaning is typed `official` on that basis.
ISO 128, Technical drawings — General principles of presentation
International Organization for Standardization · retrieved 2026-08-01
Paywalled and NOT READ. Registered so records can state which standard governs a symbol — a checkable fact a reader can act on — and for nothing else. It governs line types, views, sections and projection conventions. No meaning in any record is typed `official` on the strength of this entry. See docs/paywalled-standards.md.

Last reviewed 2026-08-23