Shaft & Housing Fits - Nachi America

Phone: (800) 829-5787 • bearingsengineer@nachiamerica.com • www.nachiamerica.com/Bearings

APPLICATION QUESTIONS2-D DRAWINGS/3-D MODELSFAILURE ANALYSIS

Shaft & Housing FitsRed = Interference

Green = Transition Blue = Clearance

Standard Electric Motor Fit (k5)

BORE TOLERANCE

O.D. TOLERANCE

HOUSING

SHAFT

f6 g6 g5 h8 h6 h5 j5 js5 j6 js6 k5 k6 m5m6 n5 n6p6

p7 r6r7

F7 G7 G6 H10 H9 H8 H7 H6 J7 JS7 J6 JS6 K6 K7 M6 M7 N6 N7 P6 P7

Standard Electric Motor Fit (H7)

Tolerance Range

Housing Bore Tolerance Range

Irregularities

LoudMetallic

Sound

LoudRegular

Sound

IrregularSound

Possible Causes Corrective ActionAbnormal load

Incorrect mounting

Insufficient or incorrect lubricant

Improper clearance

Skidding of balls

Contact of rotating parts

Flaws, corrosion or scratches on the raceways

Brinelling

Flaking in the raceways

Excessive clearance

Intrusion of foreign particles

Flaws or flaking on the ball surfaces

Excessive amount of lubricant

Insufficient or incorrect lubricant

Abnormal load

Incorrect mounting

Creep of fitted surfaces, excessive seal friction

Brinelling

Flaking

Incorrect mounting

Intrusion of foreign particles

Too much lubrication

Penetration by foreign particles or other contaminants

Operating Irregularities

.3940

.4728

.5909

.6696

.7878

.9847

1.1815

BEARING SIZE.3937

.4725

.5906

.6693

.7875

.9843

1.1812

SHAFT DIAMETER(ROTATING)

1.1819

1.2608

1.3789

1.5758

1.8514

1.1811

1.2598

1.3780

1.5748

1.8504

6200

6201

6202

6203

6204

6205

6206

6207

6208

6209

6210

6211

Max. (In) Min. (In)

HOUSING BORE(STATIONARY)

Max. (In) Min. (In)

6212

6213

6214

6215

6216

6217

6218

6219

6220

6200 SERIES STANDARD ELECTRIC MOTOR FITSShaft k5, Housing H7

1.3785

1.5753

1.7722

1.9690

2.1659

1.3780

1.5749

1.7717

1.9686

2.1654

2.3628

2.5596

2.7565

2.9533

3.1502

3.3472

3.5440

2.3623

2.5591

2.7560

2.9528

3.1497

3.3466

3.5434

3.7409

3.9377

3.7403

3.9371

2.0484 2.0472

2.4421 2.4409

2.8358 2.8346

3.1508 3.1496

3.3478 3.3465

3.5447 3.5433

3.9384 3.9370

4.3321

4.7258

4.9228

5.1197

5.5134

5.9071

4.3307

4.7244

4.9213

5.1181

5.5118

5.9055

6.3008 6.2992

6.6945

7.0882

6.6929

7.0866

.3940

.4728

.5909

.6696

.7878

.9847

1.1815

BEARING SIZE.3937

.4725

.5906

.6693

.7875

.9843

1.1812

SHAFT DIAMETER(ROTATING)

1.3789

1.4577

1.6545

1.8514

2.0484

1.3780

1.4567

1.6535

1.8504

2.0472

6300

6301

6302

6303

6304

6305

6306

6307

6308

6309

6310

6311

Max. (In) Min. (In)

HOUSING BORE(STATIONARY)

Max. (In) Min. (In)

6312

6313

6314

6315

6316

6317

6318

6319

6320

6300 SERIES STANDARD ELECTRIC MOTOR FITSShaft k5, Housing H7

1.3785

1.5753

1.7722

1.9690

2.1659

1.3780

1.5749

1.7718

1.9686

2.1654

2.3628

2.5596

2.7565

2.9533

3.1502

3.3472

3.5440

2.3623

2.5591

2.7560

2.9528

3.1497

3.3466

3.5434

3.7409

3.9377

3.7403

3.9371

2.4421 2.4409

2.8358 2.8346

3.1508 3.1496

3.5447 3.5433

3.9384 3.9370

4.3321 4.3307

4.7258 4.7244

5.1197

5.5134

5.9071

6.3008

6.6945

7.0882

5.1181

5.5118

5.9055

6.2992

6.6929

7.0866

7.4821 7.4803

7.8758

8.4664

7.8740

8.4646

NOISE

AbnormalTemperature

Rise

Vibration

Leakage or Discoloration

of Lubricant

Correction of fit, internal clearance, preload, position of housing shoulder

Correction of alignment of shaft and housing, accuracy of mounting method

Replenish lubricant or select correct lubricant

Replacement by low-noise bearings, reduction of bearing’s internal clearance

Adjustment of preload, reduction of bearing’s internal clearance or adoption of softer grease

Correction of labyrinth seal

Replacement of bearing, cleaning, improvement of seals, and usage of clean lubricant

Replacement of bearing and careful handling thereafter

Replacement of bearing

Correction of fit, clearance and/or preload

Replacement of bearing, cleaning, improvement of seals, or relubrication using clean lubricant

Replacement of bearing

Reduce amount of lubricant, select stiffer grease

Replenish lubricant or select correct lubricant

Correction of fit, internal clearance, preload, position of housing shoulder

Correction of alignment of shaft and housing, accuracy of mounting, or mounting method

Correct the seals, replacement of bearing, correction of fit or mounting

Replacement of bearing and careful handling thereafter

Replacement of bearing

Correction of squareness between shaft and housing shoulder or side of spacer

Replacement of bearing, cleaning, correction of seals

Reduce amount of lubricant, select stiffer grease

Replace bearing or lubricant, clean housing and adjacent parts

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