• One-piece cast iron housings with single output cover design, CNC machined for precise component fit and alignment.
• 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.
• 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.
• 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.
• 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.
• Mounting dimensions are interchangeable with most industry standard reducers.

Dimensions

F	3
BF	0.41
B	5.8
BE	0.38 in
C	6.38 in
O	2.29 in
AJ	5.88
K	2.5 in
I	3.61 in
O*	2.08 in
BD	6.5
D	2.28
L	4.82 in
AK	4.5
Center Distance (in)	2.06 in
T	1
LM	7.07
J	4.75 in
G	1.44
U	0.625 in
N	4.68
TAP Depth	0.63 in
H-Tap size	5/16-18 UNC in
A	3.81

Technical Specifications

Keyway	3/16 X 3/32
Output HP	0.122
Output Shaft Orientation	R
Series Code	GRG
Input Style	Flexible Coupling Input
No. of Gear Reductions	Single
Mounting Style	Base
Reducer Style	Worm - Right Angle
Output Key	1/4 X 1.44
Input HP	0.217
Output Style	R
Overhung Load	1,580
Series Type	Cast Iron 800 Worm Gear Reducers
Frame Size	56C
Output Shaft Assembly Code	R
Series Style	GRG-BM-R
Input RPM	1,750
Output RPM	17
Input Diameter (in)	0.625 in
Product Type	Right Angle
Assembly	BM-R
Output Diameter (in)	1.000 in
Input HP @ 1750 RPM	0.217
Motor Frame Size	56
Shaft Seal Material	Viton
Product Line	GRG Series - Ironman Worm Gear Reducers
Ratio Range	100:1 to 250:1
Input Keyway	3/16 X 1.38 in
Ratio	100:1
Center Distance (in)	2.06
Series	GRG Series - Ironman Worm Gear Reducers
Gear Type	Worm
Model Code	BM821
Thrust Rating - output shaft	1144
Input Bore (C Face)	0.625
Input Keyway (C Face)	3/16 x 3/32
Reducer	Worm - Right Angle
Service Factor	1
Reduction	Single
Output Shaft Direction	Right
Output Shaft	Solid Shaft
Overhung Load Rating (Output Shaft(lb))	1,580 lb
Housing Material	Cast Iron
Output Torque Rating (in-lb)	439 in/lbs

General Specifications

UPC	690310036402
Weight	30.00 LB
Packaged Length	10.69 IN
Packaged Width	9.06 IN
Packaged Height	10.50 IN