Machine Design
According to Indian standard specifications, 100 H6/g5 means that

Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
Tolerance grade for the shaft is 6 and for the hole is 5
Tolerance grade for the hole is 6 and for the shaft is 5

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Machine Design
In hydrostatic bearings

Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
The Oil film pressure is generated only by the rotation of the journal
Grease is used for lubrication

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