Engineering Guide
36Pages

ENGINEERING GUIDE MINIATURE BEARINGS FOR HOBBY AND INDUSTRY

AUDIO & VISUAL SMALL POWER TOOLS MEDICAL INSTRUMENTS OFFICE MACHINES HEALTH EQUIPMENT SMALL APPLIANCES RADIO CONTROL: Since 1987, one of our primary goals at Boca Bearing Company has been to maintain the world's largest on-going inventory of miniature bearings in all of the most popular metric and inch sizes. We also have an extensive inventory of special sizes and styles, including phenolic and plastic caged, hybrid and 3-piece thrust bearings. Whether your needs call for a few bearings, a few hundred, a few thousand or hundreds of thousands, you can rely on us for unsurpassed service,...

IDENTIFICATION SYSTEM Symbol M or Blank denotes SUJ2 (SAE52100) Chrome Steel. Symbol S denotes SUS440C (AIS1140C) Stainless Steel. Symbol F is used to designate that a Flanged Bearing is required. Style (R) is used for all miniature and instrument bearings to signify Single Row Radial Retainer Type. See Standard Bearing Part Numbers listed on the following pages. Symbol X is used to designate a change in the standard bearing size. The following symbols designate available closures. No designation denotes open bearing. Z - Single Shield RS - Single Rubber Seal VV - Double Non-Contact Seals...

BEARING STRUCTURE Metallic shield Inner ring Outer ring BEARING DESIGN extended inner ring fuN complement of balls with snap ring groove with flanged outer ring with snap ring LOAD: Single row radial ball bearings with balls separated by a cage can support radial loads, axial loads, and tilting moments. A full complement V-type ball bearing can support only radial loads and some low axial loads. SPEED: Maximum permissible speeds for ball bearings are mainly related to the bearing design and size, cage type, bearing internal clearance, method and type of lubrication, manufacturing accuracy,...

* This dimension is increased by 0.4mm for shielded version I) Bearings also available with single shield: suffix Z

Where no value is given for the dimension Ui, the inner ring is plain and dimension Li applies.

6 I) Bearings also available with single shield: suffix Z

METRIC SERIES * Where no value is given for the dimension Ui.the inner ring is plain and dimension Li applies.

METRIC SERIES * 8 * This dimension is increased by 0.4mm for shielded version I) Bearings also available with single shield: suffix Z

* Where no value is given for the dimension Ui.the inner ring is plain and dimension Li applies

10 *This dimension is increased by 0.4mm for shielded version I) Bearings also available with single shield: suffix Z

Ball Complement 'Where no value is given for the dimension Ui, the inner ring is plain and dimension Li applies.

* Bearings also available with single shield: suffix Z \ Bearings also available with single seal: suffix RS

Where no value is given for the dimension Ui, the inner ring is plain and dimension Li applies. Where no value is given for the dimension Uo, the inner ring is plain and dimension Lo applies. 13

* Bearings also available with single shield: suffix Z 14 ft Bearings also available with single seal: suffix RS

**Where no value is given for the dimension Ui, the inner ring is plain and dimension Li applies. Where no value is given for the dimension Uo, the inner ring is plain and dimension Lo applies.

Open type Shield type Seal type * Bearings also available with single shield: suffix Z Bearings also available with single seal: suffix RS

Open type Shield type Seal type Where no value is given for the dimension Ui.the inner ring is plain and dimension Li applies.

INCH SERIES ^ g *Available with inner ring width extended by 0.015" (0.3962mm) each side. I) Bearings also available with single shield:suffix Z

Where no value is given for the dimension Ui,the inner ring is plain and dimension Li applies.

/ INCH SERIES *Available with inner ring width extended by 0.015" (0.3962mm) each side. I) Bearings also available with single shield: suffix Z

' Where no value is given for the dimension Ui.the inner ring is plain and dimension b applies.

FG-SERIES with raceway F-SERIES without raceway SPECIAL SIZES SPECIAL FEATURES TEXTILE SPINDLE BEARING PHENOLIC RETAINER PHENOLIC RETAINER PLASTIC RETAINER PHENOLIC RETAINER PHENOLIC RETAINER PHENOLIC RETAINER SPECIAL FEATURES PLASTIC RETAINER PLASTIC RETAINER ANGULAR ABEC #7 CERAMIC BALLS PLASTIC RETAINER PHENOLIC RETAINER PLASTIC RETAINER PHENOLIC RETAINER PLASTIC RETAINER

SPECIAL SIZES SPECIAL FEATURES PHENOLIC RETAINER PHENOLIC RETAINER PLASTIC RETAINER PHENOLIC RETAINER PLASTIC RETAINER WIDTH 7mm PLASTIC RETAINER PLASTIC RETAINER PHENOLIC RETAINER PHENOLiC RETAINER OD 1-1/8 Inch WIDTH 1/4 Inch STEEL RETAINER WIDTH 8mm PLASTIC RETAINER WIDTH 8mm PHENOLIC RETAINER PLASTIC RETAINER PHENOLIC RETAINER; PHENOLIC RETAINER PLASTIC RETAINER PHENOLIC RETAINER PLASTIC RETAINER PHENOLIC RETAINER PLASTIC RETAINER WIDTH 7mm STEEL RETAINER WIDTH 8mm PLASTIC RETAINER PHENOLIC RETAINER PLASTIC RETAINER PHENOLIC RETAINER PHENOLIC RETAINER SPECIAL FEATURES PLASTIC RETAINER...

COMMON OIL BRANDS AND EFFICIENCY * Typical Standard Lubricants, as shipped from factory. Custom lubricants are typically a factory order.

TOLERANCE FOR INNER RING (ISO) METRIC/ENGLISH CONVERSION Square centimeters (cm2) / 6.4516 = Square inches (in2) Cubic centimeters (cm2) / 16.3871 = Cubic inches (in3) (Degrees Centigrade °C x 1.8) + 32° = Degrees Fahrenheit Meters per second x 3.281 = Feet per second

TOLERANCE FOR INNER RING (AFBMA STANDARDS)

INTERNAL CLEARANCE INTERNAL CLEARANCE AND STANDARD VALUE Internal clearance is the play between outer ring, inner ring and rolling element. Generally, the amount of up and down movement of the outer ring with respect to the fixed inner ring is called the radial internal clearance and its right and left movement the axial internal clearance. Bearing internal clearance in operation is an important factor that has a significant influence on other factors such as noise, vibration, heat and fatigue life. Radial ball bearings are usually classified by their internal radial clearance. When...