Page 12 - Craft Bearing Catalog
P. 12
Nomenclature Breakdown Lubrication
Bearing Company Inc.
In order to simplify bearing size and part identification, all numbers and letters
in Craft Bearing’s part numbers have a specific descriptive meaning.
Nomenclature Example
Inch bore sizes are in one inch increments plus the number of sixteenth of an 203 = 2 3 /16”
inch. The first one or two numbers are the whole inch and the last two are the 900 = 9”
number of sixteenth. 1208 = 12 8 /16” (12 1 /2”)
Metric Bore Sizes are indicated by the number of millimeters followed by S1 BCH 100mm HD
the letters “mm.” S1 BCH 75mm FL
S1 = Medium duty S1 BCH 312 FL
S2 = Heavy duty The duty series are available to best suit S2 BCF 403 HD
S3 = Extra Heavy duty load, life, and speed requirements. S3 BC 1100 FL
S4 = Special duty S4 BCH 307 HD
B = bearing only (one split inner race, two split clamp collars, one split roller S1 B 207 FL
cage assembly, one split outer race) S2 B 615 HD
S3 B 900 FL
C = cartridge (only) for held or floating bearing type S1 C 500
S2 C 308
H = pedestal housing (only) for held or floating bearing type S1 H 208
S2 H 315
F = flange housing (only) for held or floating bearing type S1 F 208
S2 F 315
BC = bearing-cartridge w/seals (a replacement “insert”) S1 BC 203 FL
S2 BC 315 HD
BCH = complete pillow block (bearing-cartridge w/seals and pedestal housing) S1 BCH 515 FL
S2 BCH 515 HD
BCF = complete flange block (bearing-cartridge w/seals and flange housing) S1 BCF 315 FL
S2 BCF 800 HD
FL = floating (expansion) type bearing S1 BCH 207 FL
S2 BCF 415 FL
HD = held (fixed/non-expansion) type bearing S1 BCH 207 HD
S2 BCF 415 HD
ATL = aluminum triple labyrinth seals - two seals per unit (split) ATL 407
UHMWTL = UHMW triple labyrinth seals ATL 200mm
UHMWTL 500
C-2 = less than normal internal clearance (reciprocating loads - crank shafts, etc.) S2 B 307 FLC2
S1 BCH 607 HDC3
C-3, C-5 = greater than normal internal clearance normally used in high
temperature applications, above 200°F use C-3 and above 340°F use C-5.
If no identifier is provided then a C-Normal running clearance will be provided.
XX = letter, or number/letter suffix - added to identify special modifications S1 BCH 507 FLXX
to suit a particular customer’s needs, or a special application.
Note: • Standard O-ring material is buna nitrile. For high temp-
erature applications, viton O-rings are recommended and
• Bearing sizes to 12” (300 mm) are in normal stock for immediate are automatically included when C-3 or C-5 clearance is
shipment. Bearing sizes over 12” are available. Please call for specified.
price and delivery.
• Many “special” or otherwise non-standard bore sizes or “one
• When ordering seals separate of an assembly, specify the off” pieces can be made upon demand. Please confer with our
number of seals needed. technical department.
10 Craft Bearing Company, Inc. n Newport News, Virginia n www.craftbearing.com
Craft Bearing 2017 Catalog + Spe10 10 8/14/17 1:51:22 PM