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

Technical Specifications

Overhung Load	1,000
Model Code	BM821
Series	NH Series - Ironman Narrow Housing Worm Gear Reducers
Input Bore (C Face)	0.625
Service Factor	1
Series Style	NH-BM-R
Input HP @ 1750 RPM	3.653
Center Distance (in)	2.06
Thrust Rating - output shaft	735
Product Type	Right Angle
Ratio Range	5:1
Product Line	NH Series - Ironman Narrow Housing Worm Gear Reducers
Series Code	NH
Shaft Seal Material	Viton
Input HP	3.653
Output Shaft Orientation	R
Input Diameter (in)	0.625 in
Input Keyway	3/16 X 1.38 in
Reducer	Worm - Right Angle
Output Diameter (in)	0.875 in
Output HP	3.41
Input Style	Flexible Coupling Input
Output RPM	350
Output Style	R
Motor Frame Size	56
No. of Gear Reductions	Single
Assembly	BM-R
Gear Type	Worm
Output Shaft Assembly Code	R
Input RPM	1,750
Ratio	5:1
Reducer Style	Worm - Right Angle
Frame Size	56C
Mounting Style	Base
Output Key	3/16 X 1.50
Input Keyway (C Face)	3/16 x 3/32
Reduction	Single
Output Shaft Direction	Right
Overhung Load Rating (Output Shaft(lb))	775 lb
Housing Material	Cast Iron
Output Shaft	Solid Shaft
Output Torque Rating (in-lb)	614 in/lbs

General Specifications

UPC	690310061688
Weight	26.00 LB