GD&T · Modifier · ASME Y14.5
Regardless of Feature Size (RFS) GD&T Symbol — Meaning and Datum Rule
https://shopmath.org/gdt/regardless-of-feature-size · data verified August 1, 2026
Regardless of Feature Size (RFS) (Ⓢ) is a GD&T modifier: it changes how a tolerance is interpreted rather than defining a zone of its own. It never references a datum.
- Symbol
- Ⓢ
- Unicode
- U+24C8
- Category
- Modifier
- Datum
- never
Regardless of Feature Size (RFS) · GD&T modifier symbol
Ⓢ
- Unicode
- U+24C8
- Datum
- never
Regardless of Feature Size (RFS) qualifies another tolerance rather than standing on its own — it appears after the tolerance value or the datum reference it modifies.
What Regardless of Feature Size (RFS) Controls in GD&T
The default condition since 1994: the geometric tolerance applies at whatever size the feature is actually produced, with no bonus. The circled S is legacy notation retained here because older drawings still carry it; on a current drawing the absence of any material-condition modifier already means RFS.
The Regardless of Feature Size (RFS) GD&T Symbol, Zone and Datum Rule
The symbol as it appears in the feature control frame, with the codepoint to type it and the rule it carries.
| Property | Value |
|---|---|
| Symbol | Ⓢ |
| Unicode codepoint | U+24C8 (CIRCLED LATIN CAPITAL LETTER S) |
| Category | Modifiers and material conditions — Change how a geometric tolerance is interpreted or verified. |
| Tolerance zone | n/a — modifier |
| Datum reference | Never references a datum. The tolerance zone floats to best-fit the feature, so this control says nothing about where the feature sits relative to anything else. |
| Standard | ASME Y14.5 (cited, not reproduced); ISO 1101 |
| Also called | rfs gdt, regardless of feature size, mmc vs lmc vs rfs |
The symbol character is the Unicode codepoint used in drawings and CAD annotations; drafting standards render it with defined proportions that the font approximates.
Sources and Method for the Regardless of Feature Size (RFS) GD&T Reference
- Regardless of Feature Size (RFS) symbol and rulescompiled
Symbols and codepoints: Unicode Character Database (Unicode License v3). Characteristic list cross-checked against NASA MSFC GD&T Basics (public domain). Descriptions written from scratch; no ASME Y14.5 text reproduced.
Verified against Unicode Character Database codepoint check; 98/98 structural checks passed
Compiled from independent public sources that agree cell-for-cell.
- Assumptions
- The standard is cited, never reproduced: no ASME Y14.5 definitional text, worked example or figure appears on this site. The description above is original prose.
- ASME Y14.5 and ISO 1101 differ in places — the ISO system uses the envelope requirement differently and does not carry every ASME modifier. Where a drawing names a standard, that standard governs.
- Dataset scope: EXCLUDED: all ASME Y14.5 definitional text, worked examples and figures. Every description on this site is original prose.
- Data last verified
- August 1, 2026
How to Cite This Regardless of Feature Size (RFS) GD&T Reference
Citation
ShopMath. "Regardless of Feature Size (RFS) GD&T Symbol — Meaning and Datum Rule." ShopMath, verified August 1, 2026, https://shopmath.org/gdt/regardless-of-feature-size
BibTeX
@misc{shopmath-gdt-regardless-of-feature-size,
title = {Regardless of Feature Size (RFS) GD&T Symbol — Meaning and Datum Rule},
author = {{ShopMath}},
year = {2026},
howpublished = {\url{https://shopmath.org/gdt/regardless-of-feature-size}},
note = {Data verified 2026-08-01}
}Permanent URL
https://shopmath.org/gdt/regardless-of-feature-size
Common Questions About Regardless of Feature Size (RFS) in GD&T
What does Regardless of Feature Size (RFS) mean in GD&T?
- The default condition since 1994: the geometric tolerance applies at whatever size the feature is actually produced, with no bonus. The circled S is legacy notation retained here because older drawings still carry it; on a current drawing the absence of any material-condition modifier already means RFS.
What is the Regardless of Feature Size (RFS) symbol in GD&T?
- Ⓢ — Unicode U+24C8 (CIRCLED LATIN CAPITAL LETTER S). It goes in the first compartment of the feature control frame, ahead of the tolerance value.
Does Regardless of Feature Size (RFS) need a datum?
- Never references a datum. The tolerance zone floats to best-fit the feature, so this control says nothing about where the feature sits relative to anything else.
Which GD&T modifiers are in the same group as Regardless of Feature Size (RFS)?
- Regardless of Feature Size (RFS) is one of 8 modifier modifiers: Regardless of Feature Size (RFS), Maximum Material Condition (MMC), Least Material Condition (LMC), Projected Tolerance Zone, Free State, Tangent Plane, Unequally Disposed Profile, Diameter.