• 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

AK	4.5
BE	0.38 in
AE2	0.85
AA	8
G	1.82
V	1.94 in
AG	4.65
AE1	0.3
T	1.438
D	2.31
H	0.53 in
B	4.5
Center Distance (in)	2.06 in
P	1.38 in
LL	2.12 in
BF	0.41
BD	6.5
AB	3.69
LM	7.07
I	3.61 in
U	0.625 in
AJ	5.88
AF	0.19
L	4.82 in

Technical Specifications

Reducer Style	Worm - Right Angle
Product Line	NH Series - Ironman Narrow Housing Worm Gear Reducers
Input Style	Flexible Coupling Input
Model Code	HM821
Output RPM	43
Service Factor	1
Assembly	HM-H1
Input Bore (C Face)	0.625
Output HP	0.674
Product Type	Right Angle
Input Keyway	3/16 X1.38 in
Output Shaft Orientation	H1
Frame Size	56C
Thrust Rating - output shaft	1144
Input HP @ 1750 RPM	0.916
Output Shaft Assembly Code	H1
Output Diameter (in)	1.438 in
Output Style	H1
Ratio Range	40:1
No. of Gear Reductions	Single
Reducer	Worm - Right Angle
Motor Frame Size	56C
Bore Code	23
Center Distance (in)	2.06
Input HP	0.916
Output Key	3/8 X 3.00
Gear Type	Worm
Shaft Seal Material	Viton
Series Code	NH
Series Style	NH-HM-H1
Input RPM	1,750
Input Keyway (C Face)	3/16 x 3/32
Ratio	40:1
Input Diameter (in)	0.625 in
Mounting Style	Shaft Mount
Series	NH Series - Ironman Narrow Housing Worm Gear Reducers
Reduction	Single
Output Shaft Direction	H1
Output Torque Rating (in-lb)	971 in/lbs
Housing Material	Cast Iron
Output Shaft	Hollow Bore
Overhung Load Rating (Output Shaft(lb))	775 lb

General Specifications

UPC	690310063408
Weight	26.00 LB