Kaydon slewing bearings

Glossary of abbreviations and symbols

 

Bearing & gear dimensions
Symbol	Feature	Units
α	Pressure angle of gear teeth	°
b2	Face width of gear teeth	in
Bi	Size of hole in inner ring	in
Bo	Size of hole in outer ring	in
D2	Pitch diameter of gear	in
di	Inside diameter of inner ring	in
Di	Internal diameter on outer ring	in
Do	Outside diameter of outer ring	in
do	External diameter on inner ring	in
Dp	Diameter of bearing raceway	in
dr	Internal diameter on inner ring	in
Dr	External diameter on outer ring	in
Dw	Diameter of rolling element	in
FD	Full depth involute spur gear (ref. ANSI B6.1-1968, R1974 or ISO 53:1998)	-
FS	Fellows stub involute spur gear (ref. Machinery's Handbook, 18th Edition)	-
H	Height of overall bearing assembly	in
Hi	Height of inner ring	in
Ho	Height of outer ring	in
Li	Bolt circle in inner ring	in
Lo	Bolt circle in outer ring	in
m	Module of gear teeth = 25.4/Pd	mm
nf	Number of lubrication nipples/fittings per plane	-
ni	Number holes in inner ring	-
no	Number holes in outer ring	-
Pd	Diametral pitch	-
SD	Stub involute spur gear (ref. ASA B6.1-1932)	-
x2	Addendum modification coefficient of gear teeth ("+" sign increases tooth thickness at D2 and "-" sign decreases tooth thickness at D2)	-
z2	Number of gear teeth	-

 
 

Bearing & gear properties
Symbol	Feature	Units
Crm	Moment load rating	ft-lbs
Fz	Maximum allowable gear tooth load	lbs
G	Weight of bearing assembly	lbs
Mw	Friction torque of bearing, installed and subjected to loads	ft-lbs

 
 

Pinion dimensions
Symbol	Feature	Units
b1	Face width	in
D1	Pitch diameter	in
Di1	Stock bore	in
Do1	Outside diameter	in
Dr1	Diameter of hub	in
L1	Length of pinion	in
Pd	Diametral pitch	-
w	Square key size, nominal	in
x1	Addendum modification coefficient	-
z1	Number of teeth	-

 
 

Application data
Symbol	Feature	Units
fa	Application Service Factor	-
Fa	Force parallel to bearing axis of rotation	lbs
Fr	Force perpendicular to bearing axis of rotation	lbs
Mk	Tilting moment about bearing centerline	ft-lbs
N	Rotational speed	rpm
μ	Friction coefficient	-

 
 

Miscellaneous
Symbol	Feature	Units
ft	Linear unit of measurement	foot
ft-lbs	Units of torque or moment	foot-pounds
in	Linear unit of measurement	inch
lbs	Units of force or weight	pounds
mm	Linear unit of measurement (SI)	millimeter
	Warning	-

 
 

References
AGMA	American Gear Manufacturers Association
ANSI	American National Standards Institute
ASTM	American Society for Testing and Materials
DIN	Deutsches Institut für Normung
ISO	International Standards Organization
NLGI	National Lubricating Grease Institute
SAE	Society of Automotive Engineers