NTN - Plummer Blocks

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Plummer Block and Rolling Bearing Tolerances

2. Plummer Block and Rolling Bearing Tolerances

2.1 Plummer block tolerances

The tolerances of NTN split plummer blocks meet JIS B 1551, and those of unit type plummer blocks with Japan Bearing

Manufacturers' Association standard BAS 188. The tolerances of both types are given in the tables below.

Tolerances of bearing seating bore diameter, width and center height ⋯⋯⋯⋯⋯⋯⋯⋯Table 2.1

Tolerances of length of cast iron components

(As cast portions on bearing base, bolt holes, etc.) ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯Table 2.2

Dimensions and tolerances of bore ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯Table 2.3

Dimensions and tolerances of stabilizing ring ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯Table 2.4

Table 2.1 Tolerances of plummer blocks

Split type

Unit type

Unit: mm

Plummer block series

Housing

bore

diameter

Housing

width

Center

height

Plummer block

series

Housing

bore

diameter

Center

height

Body

width

Cover

dimensions

Cover

spigot

width

∆Ds

∆gs

∆Hs

∆Ds

∆Hs

I1

I2

I3

SN5, SN5F

SN (S)6, SN (S)6F

SN2, SNZ2, SN30

SN (S)3, SNZ (SZ)3, SN31

SAF5, SAF6

SBG5

SD30, SD31

SD33

SD34, SD35

SD36

SD2, SD3

SD5, SD6

SD31TS, SD32TS

H8 H13 h13

H8 0.2 h13

SV5

SV6

SV2

SV3

SV30

SV35

VA5

H7 h11 0.2

0

1

0

0.2

Table 2.2 Tolerances of length of cast iron components

Casting size

Unit: mm

120 or less

120 to 250

250 to 400

400 to 800

800 to 1600

1.5

2.0

3.0

4.0

6.0

4

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