• 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

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

Technical Specifications

Output Diameter (in)	0.875 in
Frame Size	140TC
Product Line	NH Series - Ironman Narrow Housing Worm Gear Reducers
Series Code	NH
Product Type	Right Angle
Input Keyway (C Face)	3/16 x 3/32
Series	NH Series - Ironman Narrow Housing Worm Gear Reducers
Series Style	NH-BM-D
Input Style	Flexible Coupling Input
Reducer Style	Worm - Right Angle
Ratio	5:1
Output Style	D
Input Bore (C Face)	0.875
Center Distance (in)	2.06
Thrust Rating - output shaft	735
Input HP @ 1750 RPM	3.653
Output Shaft Assembly Code	D
Reducer	Worm - Right Angle
Model Code	BM821
Input Keyway	3/16 X 1.38 in
Gear Type	Worm
Mounting Style	Base
Output Shaft Orientation	LR
No. of Gear Reductions	Single
Input RPM	1,750
Output HP	3.41
Input HP	3.653
Output Key	3/16 X 1.50
Ratio Range	5:1
Output RPM	350
Assembly	BM-D
Service Factor	1
Motor Frame Size	140
Shaft Seal Material	Viton
Overhung Load	1,000
Input Diameter (in)	0.625 in
Reduction	Single
Output Shaft Direction	Double
Overhung Load Rating (Output Shaft(lb))	775 lb
Output Shaft	Solid Shaft
Output Torque Rating (in-lb)	614 in/lbs
Housing Material	Cast Iron

General Specifications

UPC	690310062074
Weight	26.00 LB