Industrial/Commercial Pulleys
A-Series, BB-Series, M-Series

A-Series
Dimensions and Interface Characteristics
High Pressure Laminated Phenolic Sheave with Graphite Impregnated Bronze Sleeve Bearing

Ralmark Company A - Series Number (Non-Metallic)	National Aircraft Standard Number Equivalent	Cable Size Maximum (REF) (Inches)	A Outside Dia. ± .010	B Groove Dia. ± .010	C Bore Dia. +.000 -.004	D Material Width +.010 -.000	E Groove Rad. +.003 -.000
105		3/16	5.000	4.375	.376	.433	.109
108			4.000	3.375
114	NAS383-4		3.500	2.875
120			3.000	2.375
139			2.500	1.875
130	NAS383-3		2.000	1.375
124	NAS383-2	3/32	2.500	2.000	.251	.260	.052
123	NAS383-1		2.000	1.500
138			1.250	.875

Materials
Nonmetallic Sheave – Specially formulated grade C laminated phenolic.

Bearing – Graphite impregnated bronze sleeve.

Disclaimer: The information presented is believed to be correct as of the date of publication and is subject to change without notice.

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BB-Series
Dimensions and Interface Characteristics
Commercial Ball Bearing Pulleys. High Pressure Laminated Phenolic Sheave.

Ralmark Company BB – Series Number (Non-Metallic)	Cable Size Maximum (REF) (Inches)	A Outside Dia. ± .010	B Groove Dia. ± .010	C Shoulder Dia. (approx.)	D Bore Dia. +.0000 -.0005	E Width Inner race (I.R.) +.000 -.005
138	3/32	1.250	.9375	.297	.1900	.297
123		2.000	1.500
124		2.500	2.000	.332
131	3/16	2.000	1.5625	.390	.2500	.484
128		2.500	1.875
120		3.000	2.375
114		3.500	2.875
108		4.000	3.375

Ralmark Company BB – Series Number (Non-Metallic)	F Material Width			G Groove Rad. +.003 -.000	ABMA Bearing (REF)
138	.260		+.010 -.000	.052	KP3AK
123
124					KP3K
131	.433	+.010 -.000		.109	KP4K
128
120
114
108

Materials                                             
Nonmetallic Sheave – Specially formulated grade C laminated phenolic.

Bearing Retention Sleeve - Aluminum alloy 6061-T6.

Bearing - Conforming to the requirements of AS7949 and AS21443.
 
Lubrication - Grease conforming to MIL-PRF-81322 or MIL-PRF-23827.

Disclaimer: The information presented is believed to be correct as of the date of publication and is subject to change without notice.

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Aluminum M-Series
Dimensions and Interface Characteristics
Commercial Ball Bearing Pulleys. High Pressure Laminated Phenolic Sheave.

Dash No. Metallic Sheave M	Cable Size (REF) (Inches)	A Outside Dia. ± .010	B Groove Dia. ± .010	C Shoulder Dia. (approx.)	D Bore Dia. +.0000 -.0005	E Width I.R. +.000 -.005
-1B	3/32	1.250	.972	.297	.1900	.297
-2B		2.500	2.222	.332
-3B	3/16	2.000	1.510	.390	.2500	.484
-4B		3.500	3.010
-5B	1/4	5.000	4.374	.591	.3750	.620
-6B		*6.000	5.374

Dash No. Metallic Sheave M	F Material Width		G Groove Rad.		H Flange Width		I ±.005	Pulley Assembly Max. Weight (LBS)	ABMA Bearing (REF)
-1B	.250	+.000 -.010	.052	+.003 -.000	.060	±.005	.040	.035	KP3AK
-2B								.120	KP3K
-3B	.422	+.000 -.012	.109	+.003 -.000	.086	±.006	.086	.115	KP4K
-4B								.345
-5B	.500	±.007	.140	+.005 -.000	.092	±.007	.092	.795	KP6
-6B								1.0

Materials 
Metallic Sheave – Aluminum alloy 2024-T351. Aluminum sheaves are anodized per MIL-A-8625, Type II, Class I.

Bearing - Conforming to the requirements of AS7949, AS21443, and AS27640.

Lubrication - Grease conforming to MIL-PRF-81322 or MIL-PRF-23827.

Disclaimer: The information presented is believed to be correct as of the date of publication and is subject to change without notice.

Ralmark Company
PO Box 1507
Kingston, PA 18704-0507
Phone: 570-288-9331
Fax: 570-288-0902
sales@ralmark.com