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SingaporeDear Sir
We request you to quote for the following items which are mentioned in each column. We also request you to comply the technical specifications which you are offering against each line.
RFQ NO. 748
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SL. No |
UMAC SPECIFICATIONS |
QTY |
PRICE |
SUPPLIER’S OFFERED SPECIFICATIONS |
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20 pairs |
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1 |
Description |
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1.1 |
Type |
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Non-separable, non interchangeable, thin angular contact ball bearings as matched pairs with built in pre load |
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1.2 |
Application |
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These bearings shall be suitable for jitter free operation of 25 rpm(inner race revolving)under an axial pre-load of 100N±10N in face to face(DF)mounting. Operating is -10° to +70° C under hard vacuum of more than 10⁻⁶ torr and shall be suitable for spacecraft application of more than 10 years life without degradation in performance |
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1.3 |
Dimensions |
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Bore diameter |
80 mm |
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Outer diameter |
100 mm |
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Width |
10 mm |
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1.4 |
Cage |
One piece machined type with cylindrical ball pockets |
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1.5 |
Contact angle |
15±2° |
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1.6 |
Pre-load |
100N±10N when Face to Face mounted |
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2 |
Tolerances |
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Ring |
ABEC-7P |
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Ball |
Grade 3 AFBMA standard |
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3 |
Materials |
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Rings and balls |
AISI 440 C, Consumable Electrode |
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Cage |
Cotton based phenolic |
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4 |
Engineering data |
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Static radial load rating |
9950 N |
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Static thrust load rating |
25400 N |
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Basic dynamic capacity |
8700 N |
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5 |
Passivation and TCP Treatment |
Balls and rings should be subjected to Passivation and TCP treatment so that the rings and balls highly wettable |
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6 |
Lubrication |
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Lubricant |
By thin film of Nye-2001A-T oil |
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Vacuum oil impregnation of cages |
By Nye-2001 A-T oil |
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7 |
Barrier film coating |
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The barrier film coating, suitable for Nye 2011A-T oil to be applied on the bearing faces to prevent oil migration. |
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8 |
Visual inspection and Wettability test |
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Inner race, outer race and cage ball pockets are to be inspected under 30X magnification for defects like pits, dents, Brinell marks, scratches, burrs, foreign particles poorly bonded particles etc. The critical areas(contact area) shall not have any defects mentioned above. Rings and balls are to be checked for Wettability after Passivation and TCP treatment. It shall be ensure that the rings and balls are highly wettable by maintaining proper chemical cleanliness.
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9 |
Torque testing |
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All assembled bearing pairs shall be tested for low speed torque trace. The torque shall be low (250gmcm maximum per pair) and uniform with least hash width(less than 20% of mean torque) Test Conditions: · Shaft axis of the pair to be vertical · Rotating inner ring · Rotating speed : 2rpm · Addition axial load on the preloaded pair : 50N approximately In both directions of rotation, one revolution in clock-wise and one revolution in counter clockwise shall be traced and supplied |
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10 |
Packaging |
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Each bearing shall be individually packed in envelope with excess lubricant. Package shall be suitable for long term storage. |
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11 |
Documentation |
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1 |
Bearing bore, COD and inner race width to the nearest of 0.5 micron |
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2 |
Nominal osculation of inner and outer race grooves with respect to ball diameter |
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3 |
Nominal Ball size and Number of balls |
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4 |
Bearing Load rating(static radial, static thrust and dynamic) |
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5 |
Nominal cage dimensions (ID, OD, Width, Pocket diameter)with tolerance |
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6 |
Batch properties of the cage material used |
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7 |
Typical dry weight and quantity of oil rented after impregnation(after 75g centrifuge for 2 min at ambient) for the cages to the nearest of 0.1 mg |
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