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ENGINEERING

Housing Geometry Requirements

t3 A

t3 B

A

B

t2

D

D

t2

Ra

Ra

t1

t1

Housing Tolerance

t4 A

Tolerance

MM

MMV

MMX

Value

ABEC 7

HG

ABEC 9

t1

IT2

IT1

IT0

t2

IT2

IT1

IT0

t3

IT2

IT1

IT0

t4

IT3

IT2

IT2

16 "

or

0.4 m

Description

Symbol

Roundness Parallelism Squareness Concentricity

Surface Finish

Ra

Housing Journal Diameter (D) mm

  • >

    <

10

18

18

30

30

50

50

80

80

120

120

180

180

250

250

315

315

400

Reference ISO 286.

10

18

30

50

80

120

18

30

40

60

100

160

30

50

40

60

100

160

50

80

50

80

120

200

80

120

60

100

160

240

120

180

80

140

200

310

180

250

120

180

280

390

250

315

140

240

310

470

315

400

180

240

310

470

0.8

1.2

2.0

3.0

1.0

1.5

2.5

4.0

1.0

1.5

2.5

4.0

1.2

2.0

3.0

5.0

1.5

2.5

4.0

6.0

2.0

3.5

5.0

8.0

3.0

4.5

7.0

10.0

3.5

6.0

8.0

12.0

4.5

6.0

8.0

12.0

Housing Journal Diameter D mm

  • >

    <

IT0

Units – Micrometer (m)

IT1

IT2

IT3

IT3

IT0

Units – Microinches (in.)

IT1 IT2

102800

E7

ENGINEERING

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