Paano pinipili ang sukat ng susi?

By shaft diameter per the DIN 6885 standard lookup table (the equivalent ISO/R 773 recommendation is withdrawn).

Anong mga stress ang sinusuri?

Shear stress tau=F/(w*L) at bearing stress sigma=F/((h/2)*L).

Anong haba ng susi ang gagamitin?

1 hanggang 1.5 beses ang diameter ng shaft. Ang minimum ay haba ng hub na binawasan ang mga chamfer.

Ano ang tungkol sa concentración ng stress?

Ang keyway ay lumilikha ng Kt=1.5–2.5. Gumamit ng end-milled keyways para sa mas mahabang buhay laban sa pagod (fatigue life).

Maaari bang gumamit ng dalawang susi?

Oo, sa 180 degree. Ipagpalagay na ang bawat isa ay nagdadala ng 75% dahil sa mga toleransya.

Libreng Engineering Tool #074

Keyway Calculator — DIN 6885

Key sizes per DIN 6885 (formerly ISO/R 773, withdrawn). Enter shaft diameter and torque to find the standard key size and run simplified shear and bearing stress checks.

DIN 6885Stress CheckAuto-Calc

Results

Standard na Susi (w × h)

—

Puwersang Tangential

—

Shear Stress

—

Bearing Stress

—

SF (Shear)

—

SF (Bearing)

—

Puwersang Tangential

Shear Stress sa Susi

Bearing Stress

Standard Key Sizes (DIN 6885)

Key cross-sections below follow DIN 6885. The corresponding ISO recommendation, ISO/R 773, has been withdrawn and is mentioned here for historical reference only; it listed the same sizes but is no longer a current ISO document.

Shaft d (mm)	Susi w×h (mm)
6–8	2×2
8–10	3×3
10–12	4×4
12–17	5×5
17–22	6×6
22–30	8×7
30–38	10×8
38–44	12×8
44–50	14×9
50–58	16×10
58–65	18×11
65–75	20×12
75–85	22×14
85–95	25×14

Haba ng susi = 1–1.5× diameter ng baras. Suriin ang concentración ng stress sa sulok ng keyway (K_t=1.5–2.5). The shear and bearing formulas above are simplified engineering checks assuming uniform stress distribution — they are common design practice, not requirements of any current ISO standard.