Bearing Life Calculator (ISO 281)

Predict rolling element bearing L₁₀ life and L₁₀h operating hours using ISO 281 dynamic load rating methodology. Includes reliability and lubrication viscosity factors.

L10h Rated Life (L₁₀h)
46hours
Lna (90% Reliability)
46hours
Equivalent Load P
5.000N
Static Safety S0
0.95
SKF 6301-2RSH · 12×37×12 mmC = 10.1 kN · C₀ = 4.75 kN · Pu = 0.2 kN
ISO P62RSH

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SKF · 6301-2RSH · 2RSH CONTACT SEALSKF 6301-2RSH12 × 37 × 12 mm · All TypesKINEMATICS & LOADn = 3000 d/dk (314.2 rad/s)Fr = 5000 N · Fa = 1000 N
LIVE TELEMETRYdeep-groove-ball
SKF Code:6301-2RSH
Nominal Diameter:12 × 37 × 12 mm
Shaft Abutment (da):17.6 - 17.8 mm
Housing Abutment (Da max):≤ 31.4 mm
Dynamic Rating (C) / Static Rating (C0):10.1 / 4.75 kN
Speed:3000 rpm
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SKF 6301-2RSH - Dimension & Tolerance SpecificationsDeep Groove Ball

ISO 15 boundary dimensions and ISO 492 / SKF Table 2, 3, 4 dimensional deviation limits. (Official Catalog: Page 272)

Tolerance Class:
Bore Diameter (d) (d)12 mm+0 / -7 µm
Outer Diameter (D) (D)37 mm+0 / -9 µm
Width (B) (B)12 mm+0 / -60 µm
Inner Shoulder (d1 / d2)≈ 17.5 mmSeal/Shoulder Dia
Outer Shoulder (D1 / D2)≈ 31.48 mmGroove/Shoulder Dia
Chamfer (r1,2 min)1 mmMinimum Chamfer Dimension
SKF Load Ratings, Speed Limits & Mass
Dynamic (C)10.1 kN
Static (C₀)4.75 kN
Fatigue Limit (Pu)0.2 kN
Limiting Speed14000 rpm
Reference Speed40000 rpm
Mass0.06 kg
Formula

L₁₀ = (C / P)ᵖ · 10⁶ revs | L₁₀h = 10⁶·L₁₀ / (60·n) | Lnm = a₁·L₁₀h | Gp = 0.005·D·B [g]

Official SKF Master Catalog (PUB BU/P1 17000/1 EN) and ISO 281 rating life calculation.

ISO 281 (LIFE)ISO 492 (TOLERANCES)ISO 15 (DIMENSIONS)DIN 5418 (ABUTMENTS)SKF PUB BU/P1 17000SKF PUB SR/P7 10001
Assumptions
  • •Dynamic and static load ratings are taken directly from the authentic SKF master catalog.
  • •For sealed 2RSH bearings, the maximum mounting temperature must never exceed 80°C.
  • •Shaft fillet radius (ra) must strictly remain smaller than or equal to bearing chamfer (r1,2 min).
  • •SKF formula Gp = 0.005 * D * B calculates periodic regreasing; sealed 2RSH units require no initial fill.
Academy
▸Formula · assumptions · worked example(ISO 281:2007 · ISO 76:2006 (Static rating))

Formula

L_{10} = \left(\frac{C}{P}\right)^p \times 10^6 \text{ rev}, \quad L_{10h} = \frac{L_{10} \times 10^6}{60 \cdot n}

p = 3 (ball bearings) or 10/3 (roller bearings). ISO 281 basic rating life with radial/axial equivalent dynamic load P = X·Fr + Y·Fa.

Assumptions

  • · Equivalent dynamic load P = X·Fr + Y·Fa computed per ISO 281 radial/axial factors
  • · Operating temperature and lubricant viscosity ratio κ (kappa) maintain elastohydrodynamic film
  • · Catalog dynamic capacity C and static capacity C0 sourced from verified bearing standards
Bearing life guide →
ISO 281:2007 / ISO 76:2006

Deep Groove Ball Bearing L10 Rating Life (SKF 6208)

STATUS: PASS(+9.3% life reserve, S0 2.1x over required)

Dynamic equivalent load and basic rating life (L10 revolutions and L10h hours) under combined radial and thrust loading at 1500 rpm.

1. Inputs & Boundary Parameters (Girdiler)
Bearing designationSKF 6208 (40×80×18) ISO 15
Dynamic load capacity C32.50 kN
Static load capacity C019.00 kN
Radial force Fr6.00 kN
Axial force Fa1.80 kN
Rotational speed n1500 rpm
Life exponent p3.00 (Ball)
Operating temperature T65.0 °C
2. Applied Governing Equations & Standard Clauses (Bağıntılar & Norm Maddesi)
Equivalent Dynamic Load P: P = X·Fr + Y·Fa (X=0.56, Y=1.55 when Fa/Fr > e)
ISO 281:2007 Clause 5.2.2
Rating Life (Revolutions): L10 = (C / P)^p [10^6 rev]
ISO 281:2007 Clause 5.1
Rating Life (Hours): L10h = (10^6 · L10) / (60 · n) [h]
ISO 281:2007 Clause 5.1
Static Safety Factor S0: S0 = C0 / P0 (P0 = max(Fr, 0.6·Fr + 0.5·Fa))
ISO 76:2006 Clause 5
3. Intermediate Calculation Stages (Ara Değerler)
Axial load ratio Fa/C0Limiting thrust factor e = 0.28 (Fa/Fr = 0.30 > e)
0.0947 [-]
Equivalent dynamic load PP = 0.56·(6.0) + 1.55·(1.80)
6.15 kN
Static safety factor S0P0 = max(6.0, 0.6·6 + 0.5·1.8) = 6.00 kN
3.17 [-]
Rating life revolutions L10(32.50 / 6.15)^3.0
147.6 million rev
4. Engineering Verification Result & Limit Threshold (Sonuç + Sınır)PASS
Rating Life L10h & Static Safety S0: L10h = 1,640 hrs (L10 = 147.6M rev)
Acceptance limit: L10h ≥ 1,500 hrs target | S0 = 3.17 ≥ 1.50