Kaydon Reali-Slim® open thin section bearings and sealed bearings, stainless steel bearings, and Endurakote® bearings are marked for complete identification with an (8) or (9) digit part number. Positions 1–8 identify materials, size, type, and precision. Position 9 (optional) identifies non-standard internal fit.
| Position | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10–13 |
|---|---|---|---|---|---|---|---|---|---|---|
| Nomenclature | Material | Series | Size | Type | Separator | Precision | Internal fit | DFAR compliance | ||
| Example | K | G | 1 | 2 | 0 | X | P | 0 | L | -USA |
| Position 1—Material | ||
|---|---|---|
| Races/balls | Seals, shields | |
| A | AISI 52100 Steel | One seal—PTFE |
| B | AISI 52100 Steel | Two seals—PTFE |
| D | AISI 52100 Steel | One shield |
| E | AISI 52100 Steel | Two shields |
| F | AISI 52100 Steel |
One seal—Nitrile rubber Lami-seal® |
| G | AISI 52100 Steel |
Two seals—Nitrile rubber Lami-seal® |
| H | AISI 52100 Steel | One seal—Nitrile rubber |
| J | AISI 52100 Steel | Two seals—Nitrile rubber |
| K | AISI 52100 Steel | No seals or shields |
| L | AISI 52100 Steel | Two seals & Endurakote® plating |
| M | M-50 Steel | No seals or shields |
| N | AISI 52100 Steel | No seals & Endurakote® plating |
| P | AISI 17-4PH Steel | Ceramic balls |
| Q | AISI 52100 Steel | No shields or seals |
| S | AISI 440C Stainless Steel | No seals or shields |
| T | AISI 440C Stainless Steel | One seal—PTFE |
| U | AISI 440C Stainless Steel | Two seals—PTFE |
| V | AISI 440C Stainless Steel | Two shields |
| W | AISI 440C Stainless Steel | Two seals—Nitrile rubber |
| X | AISI 52100 Steel | Ceramic balls |
| Y | AISI 440C Stainless Steel | Ceramic balls |
| Z | Other | |
| Position 2—Standard series cross section (inches) | ||||
|---|---|---|---|---|
| Open bearings | ||||
| Radial thickness | Width | |||
| AA | *.187 | x | .187 |
 |
| A | .250 | x | .250 |
 |
| B | .312 | x | .312 |
 |
| C | .375 | x | .375 |
 |
| D | .500 | x | .500 |
 |
| F | .750 | x | .750 |
 |
| G | 1.000 | x | 1.000 |
 |
| Sealed bearings | ||||
| Radial thickness | Width | |||
| JHA | .187 | x | .250 |
 |
| JA | .250 | x | .250 |
 |
| JB | .312 | x | .312 |
 |
| JU | .500 | x | .375 |
 |
| JG | 1.000 | x | 1.000 |
 |
| * Smaller section applies when position 3 is alphabetic—see following explanations of positions 3, 4, and 5. | ||||
| Positions 3, 4, & 5—Size (bearing bore) |
|---|
|
Numeric characters Nominal bearing bore in inches multiplied by ten
Alphabetic characters
Examples |
| Position 6—Bearing type | ||
|---|---|---|
| A | Angular contact single bearing (not ground for universal duplexing) |
 |
| B | Angular contact pair—duplexed back to back |
 |
| C | Radial contact |
 |
| F | Angular contact pair—duplexed face to face |
 |
| T | Angular contact pair—duplexed tandem |
 |
| U | Angular contact single bearing—ground for universal duplexing |
 |
| X | Four-point contact |
 |
| Z | Other | |
| Position 7—Separator | |
|---|---|
 |
|
| C | Non-metallic composite, segmental, "snap-over" type |
| D | Phenolic laminate, one-piece ring "snap-over" type |
| E | Brass, segmental "snap-over" type |
| L | Nylon, one-piece ring "snap-over" type |
| N | Nylon, "snap-over" type |
| P | Standard formed ring "snap-over" type (material—brass or non-metallic composite) |
| T | Stainless steel, formed ring "snap-over" type |
| V | Brass, formed ring, "snap-over" type |
| X | PEEK, one-piece, "snap-over" pocket |
 |
|
| G | Nylon one-piece ring, circular pocket |
| H | Phenolic laminate, one-piece ring with circular pockets |
| J | Nylon strip separator, circular pockets |
| K | Phenolic laminate, riveted two-piece ring |
| Q | PEEK, one-piece ring, circular pocket |
| R | Standard formed ring, circular pocket (material—brass or non-metallic composite) |
| U | Stainless steel, formed ring circular pockets |
| Y | Brass, formed ring, circular pockets |
 |
|
| M | Formed wire, strip or segmental, "snap-over" type, ball in every pocket |
| W | Formed wire, strip or segmental, "snap-over" type |
 |
|
| F | Full complement bearing—no separator |
| S | Helical coil springs |
| Z | Other (toroids, slugs, spacer balls or others available) |
| Position 8—Precision | |
|---|---|
| (ABEC specifications are per ABMA standard 26.2) | |
| 0 | Kaydon precision class 1 per ABEC 1F |
| 1 | Kaydon precision class 1 with class 4 runouts |
| 2 | Kaydon precision class 1 with class 6 runouts |
| 3 | Kaydon precision class 3 per ABEC 3F |
| 4 | Kaydon precision class 4 per ABEC 5F |
| 6 | Kaydon precision class 6 per ABEC 7F |
| 8 | Other |
| Position 9—Bearing internal fit | |
|---|---|
| A | .0000 to .0005 clearance |
| B | .0000 to .0010 clearance |
| C | .0005 to .0010 clearance |
| D | .0005 to .0015 clearance |
| E | .0010 to .0020 clearance |
| F | .0015 to .0025 clearance |
| G | .0020 to .0030 clearance |
| H | .0030 to .0040 clearance |
| I | .0040 to .0050 clearance |
| J | .0050 to .0060 clearance |
| K | .0000 to .0005 preload |
| L | .0000 to .0010 preload |
| M | .0005 to .0010 preload |
| N | .0005 to .0015 preload |
| P | .0010 to .0020 preload |
| Q | .0010 to .0015 preload |
| R | .0015 to .0025 preload |
| S | .0020 to .0030 preload |
| Z | Other clearance or preload not specified above |
|
Type X or C = diametral preload or clearance Duplexed type A = axial preload or clearance Note: Above internal bearing fits apply to unmounted bearings only. Mounting fits can greatly affect final internal bearing fit. |
|
| Position 10–13—DFAR compliance |
|---|
|
All Reali-Slim® bearings requiring compliance with Defense Federal Acquisition Regulations (DFAR) "Specialty Metals" and "the Restrictions on Acquisition of Ball and Roller Bearings" clauses will contain '-USA' in positions 10-13. If internal fit is not called out in position 9, it will also contain a dash.
Example #1: KG120XP0L-USA |
