• 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

L	4.82 in
C	6 in
J	3.25 in
D	2.31
U	0.625 in
BE	0.38 in
Center Distance (in)	2.06 in
I	3.61 in
O	2.66 in
G	0.94
LM	7.07
BD	6.5
F	1.88
A	2.5
T	0.875
H-Tap size	5/16 - 18 UNC in
TAP Depth	0.63 in
K	1.63 in
AJ	5.88
AK	4.5
BF	0.41
O*	2.45 in
B	4.5
N	4.34

Technical Specifications

Thrust Rating - output shaft	1144
Series Code	NH
Output Style	D
Input RPM	1,750
Series Style	NH-BM-D
Output Key	3/16 X 1.50
Service Factor	1
Frame Size	140TC
Output Shaft Assembly Code	D
Model Code	BM821
Reducer	Worm - Right Angle
Series	NH Series - Ironman Narrow Housing Worm Gear Reducers
Input Keyway (C Face)	3/16 x 3/32
Input HP	1.584
Input HP @ 1750 RPM	1.584
Assembly	BM-D
Ratio	20:1
Overhung Load	1,175
Input Style	Flexible Coupling Input
Output HP	1.338
Input Bore (C Face)	0.875
Center Distance (in)	2.06
Mounting Style	Base
Shaft Seal Material	Viton
No. of Gear Reductions	Single
Product Type	Right Angle
Product Line	NH Series - Ironman Narrow Housing Worm Gear Reducers
Motor Frame Size	140
Output Shaft Orientation	LR
Input Keyway	3/16 X 1.38 in
Output Diameter (in)	0.875 in
Input Diameter (in)	0.625 in
Gear Type	Worm
Reducer Style	Worm - Right Angle
Output RPM	87
Ratio Range	20:1
Reduction	Single
Output Shaft Direction	Double
Output Torque Rating (in-lb)	964 in/lbs
Housing Material	Cast Iron
Output Shaft	Solid Shaft
Overhung Load Rating (Output Shaft(lb))	775 lb

General Specifications

UPC	690310062104
Weight	26.00 LB