ENGINEERING TOOL · METRIC GROOVE LOOKUP
Thread and shoulder relief groove calculator
Switch between pitch-keyed thread withdrawal grooves and diameter-keyed shaft-shoulder grinding-wheel reliefs without mixing their dimensions.WITHDRAWAL & RUN-OUT GROOVES
Two distinct standards. One fast lookup surface.
EXTERNAL THREAD GROOVE DIAMETER dgØ7.7 mmd 10 − standard reduction 2.3
h13The section shows where each published limit applies. The labelled values—not the drawn proportions—govern.
LIVE 2D SECTIONExternal thread withdrawal groove
SCHEMATIC · DEPTH EXAGGERATEDExternal thread section: nominal Ø10 mm reduces to groove Ø7.7 mm; g₁ is at least 2.5 mm, g₂ is at most 4.5 mm, radial depth is 1.15 mm, and r is approximately 0.8 mm.
NominalM10
PitchP 1.5 mm
Standard diameter reduction2.3 mm
Standard rowGB/T 3-1997 · Table 2
FIGURE 1e · CURRENT DIAMETER BAND2 standard optionsFor shaft Ø25 mm
>10–50 mmPreview any listed option in the same Figure 1e section. Previewing does not select or recommend it.
LIVE 2D SECTION · FIGURE 1eViewing option 01
PREVIEW ONLY · NO RECOMMENDATIONView standard option
Figure 1e section, previewing option 01 of 2: b₁ 2 mm, h 0.3 mm in both directions, and r 0.8 mm. This is not a recommendation.
| Option | Groove width b₁ | Depth h | Radius r |
|---|---|---|---|
| 01 | 2 mm | 0.3 mm | 0.8 mm |
| 02 | 3 mm | 0.4 mm | 1 mm |
STANDARD FORMExternal cylinder + end faceFigure 1e uses b₁.
RADIUS RULEr ≤ 3hNo sharp corner at groove transitions.
SELECTIONEngineering decisionSurface finish and tolerance depend on part function.
TWO TABLES, TWO INPUT LOGICS
Thread pitch sizes one family. Shaft diameter selects the other.
GB/T 3-1997 · Tables 2 and 4
External and internal thread grooves use different published pitch rows, width symbols and groove-diameter directions. Exact rows only—no interpolation.
GB/T 6403.5-2008 · Figure 1e / Table 1
The implemented form is the common external-cylinder and end-face grinding relief. Each diameter band contains multiple valid b₁/h/r combinations.
USE THE RESULT WELL
A table value does not choose the manufacturing detail for you.
Check g₁ minimum, g₂ maximum, groove diameter dg and its h12/h13 tolerance. The standard also requires a transition angle α of at least 30°.
Choose normal G₁ unless the structure requires the short form. Dg uses H13; the page derives single-side depth from the published diameter increase.
The result lists current-band options rather than marking one “recommended.” Larger parts may use a smaller specification where engineering judgment supports it.
VERIFIED REFERENCE BASIS