• 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

H-Tap size	5/16 - 18 UNC in
J	3.25 in
D	2.31
G	0.94
C	6 in
U	0.625 in
Center Distance (in)	2.06 in
T	0.875
M	1.76
A	2.5
O	2.66 in
B	4.5
L	4.82 in
TAP Depth	0.63 in
I	3.61 in
N	4.34
K	1.63 in
F	1.88

Technical Specifications

Product Line	NH Series - Ironman Narrow Housing Worm Gear Reducers
Reducer Style	Worm - Right Angle
Output RPM	17
Output Shaft Assembly Code	R
Assembly	B-R
Output Diameter (in)	0.875 in
Ratio	100:1
Mounting Style	Base
Overhung Load	1,580
Input RPM	1,750
Input Style	Solid Shaft
Input HP @ 1750 RPM	0.217
Series Code	NH
Model Code	B821
Shaft Seal Material	Viton
Ratio Range	100:1 to 250:1
Service Factor	1
Center Distance (in)	2.06
Thrust Rating - output shaft	1144
Input Diameter (in)	0.625 in
Input HP	0.217
Series	NH Series - Ironman Narrow Housing Worm Gear Reducers
Output HP	0.122
Series Style	NH-B-R
Gear Type	Worm
Output Key	3/16 X 1.50
Output Style	R
Input Keyway	3/16 X 1.38 in
Output Shaft Orientation	R
Product Type	Right Angle
No. of Gear Reductions	Single
Reducer	Worm - Right Angle
Reduction	Single
Output Shaft Direction	Right
Output Torque Rating (in-lb)	439 in/lbs
Overhung Load Rating (Output Shaft(lb))	775 lb
Output Shaft	Solid Shaft
Housing Material	Cast Iron

General Specifications

UPC	690310061435
Weight	21.00 LB