• Rugged cast iron housings, covers, and flanges provide superior strength and rigidity.
• Factory-filled with premium Mobil Glygoyle 460 polyalkalene glycol lubricant.
• Large oil capacity provides positive splash lubrication and superior cooling capability.
• Viton® double lip seals provide extended life through increased resistance to high temperature, abrasion and chemicals.
• O-rings on all bearing covers, eliminating gaskets, sealants and leaks.
• Oversized high-speed bearings, positively retained for frequent reversing and start/stop cycles. Tapered roller bearings on output shaft for high overhung and thrust load capacities.
• The unique quill seal guard protects the input seal from damage during motor installation.
• Bronze worm gear chill cast from high quality bronze for maximum strength, lubricity and superior life.
• All units are 100% run and leak tested at the factory to insure that you receive the highest quality product.
• Ultimate application flexibility with all-angle mounting provisions, the widest selection of accessory bases and flanges and the largest selection of stock reducer styles.

Dimensions

C	6 in
U	0.625 in
L	4.82 in
AK	4.5
D	2.31
I	3.61 in
BF	0.41
O	2.66 in
B	4.5
K	1.63 in
BE	0.38 in
Center Distance (in)	2.06 in
F	1.88
TAP Depth	0.63 in
G	0.94
A	2.5
LM	7.07
J	3.25 in
AJ	5.88
BD	6.5
H-Tap size	5/16 - 18 UNC in
N	4.34
T	0.875

Technical Specifications

Shaft Seal Material	Viton
Overhung Load	1,385
Output RPM	35
Gear Type	Worm
Input Keyway	3/16 X 1.38 in
Output Shaft Orientation	R
Output Style	R
Input Keyway (C Face)	3/16 x 3/32
Input RPM	1,750
Ratio Range	50:1
Series Style	NH-BM-R
Service Factor	1
Mounting Style	Base
Input HP @ 1750 RPM	0.769
Input Diameter (in)	0.625 in
Product Type	Right Angle
Output Shaft Assembly Code	R
Motor Frame Size	140
Input Bore (C Face)	0.875
Input HP	0.769
No. of Gear Reductions	Single
Model Code	BM821
Output HP	0.539
Reducer	Worm - Right Angle
Series Code	NH
Product Line	NH Series - Ironman Narrow Housing Worm Gear Reducers
Reducer Style	Worm - Right Angle
Assembly	BM-R
Output Diameter (in)	0.875 in
Ratio	50:1
Center Distance (in)	2.06
Frame Size	140TC
Input Style	Flexible Coupling Input
Thrust Rating - output shaft	1144
Output Key	3/16 X 1.50
Series	NH Series - Ironman Narrow Housing Worm Gear Reducers
Reduction	Single
Output Shaft Direction	Right
Overhung Load Rating (Output Shaft(lb))	775 lb
Output Torque Rating (in-lb)	970 in/lbs
Output Shaft	Solid Shaft
Housing Material	Cast Iron

General Specifications

UPC	690310062067
Weight	26.00 LB