Is this the complete ISO 492:2023 table?

No. ISO 492:2023 is the current sixth edition and covers many dimensional and geometrical characteristics. This tool reproduces only SKF-published mean cylindrical bore and outside-diameter deviation limits for its stated Normal, P6 and P5 scope.

Why must bore d and outside diameter D be entered separately?

The bore deviation range is selected from nominal bore d, while the outer-ring deviation range is selected independently from nominal outside diameter D.

Does the lookup cover tapered roller or thrust bearings?

No. The selected SKF tables apply to metric radial bearings except tapered roller bearings. Thrust, tapered roller, inch and tapered-bore bearings use other tables.

Does it calculate bore or outside-diameter variation?

No. Variation tolerances depend on additional details such as diameter series and sealing state. The former single Vdp output was therefore removed.

Are ABEC classes interchangeable with ISO classes?

Do not substitute a simple ABEC label for a complete ISO specification. Verify the exact bearing standard, characteristic and manufacturer designation required by the application.

免費工程參考資料 #049

軸承直徑公差查詢

查詢 SKF 發布之公制徑向軸承（錐形滾子軸承除外）平均內徑與外徑偏差極限。輸入公稱 d 與 D 分別輸入。

SKF 表 2–4ISO 492:2023 背景普通級 / P6 / P5

發布之偏差極限

平均內徑偏差 Δdmp

—

平均外徑偏差 ΔDmp

—

允差平均內徑

—

允差平均外徑

—

使用之表格列數

—

兩項輸出之含義

Δdmp — 平均圓柱內徑相對於公稱尺寸之偏差 d.
ΔDmp — 平均外徑相對於公稱尺寸之偏差 D.

此處顯示之允差平均尺寸區間為公稱尺寸加上發布之下偏差與上偏差（μm 換算為 mm）。

來源邊界

數值抄錄自 SKF《Rolling bearings》A.2 節表 2–4。SKF 聲明標準化數值符合 ISO 492，並指出這些表格適用於公制徑向軸承（錐形滾子軸承除外）。

ISO 492:2023 為當前第六版。其範圍涵蓋尺寸與幾何特性，並排除某些特定軸承類型與應用。本頁不宣稱完整重製其規範表格。

未包含： P4/P2、寬度、形狀、偏擺、單平面直徑變化、直徑系列或密封軸承修正值、錐形內徑、錐形滾子軸承、推力軸承及英制軸承。請針對這些特性查閱最新標準與產品資料。