• 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

O*	2.08 in
K	2.5 in
G	1.44
B	5.8
A	3.81
LM	7.07
AJ	5.88
AK	4.5
TAP Depth	0.63 in
H-Tap size	5/16-18 UNC in
Center Distance (in)	2.06 in
F	2.88
BD	6.5
N	4.68
U	0.625 in
D	2.28
O	2.29 in
I	3.61 in
J	5 in
T	1
BE	0.38 in
BF	0.41
C	6.38 in
L	4.82 in

Technical Specifications

Input Style	Flexible Coupling Input
Service Factor	1
Ratio	50:1
Input Bore (C Face)	0.625
Input HP	0.769
Reducer	Worm - Right Angle
Output HP	0.539
Output Shaft Orientation	LR
Output Diameter (in)	1.000 in
Output RPM	35
Input HP @ 1750 RPM	0.769
Series Style	GRL-BM-D
Input Diameter (in)	0.625 in
Center Distance (in)	2.06
No. of Gear Reductions	Single
Mounting Style	Base
Overhung Load	1,385
Input Keyway	3/16 X 1.38 in
Gear Type	Worm
Model Code	BM821
Shaft Seal Material	Viton
Assembly	BM-D
Frame Size	56C
Output Style	D
Ratio Range	50:1
Output Key	1/4 X 1.44
Product Type	Worm Speed Reducer
Motor Frame Size	56C
Product Line	GRL Series - Ironman Worm Gear Reducers
Input RPM	1,750
Input Keyway (C Face)	3/16 x 3/32
Series	GRL Series - Ironman Worm Gear Reducers
Output Shaft Assembly Code	D
Thrust Rating - output shaft	1144
Reducer Style	Worm - Right Angle
Series Code	GRL
Reduction	Single
Output Shaft Direction	Double
Output Torque Rating (in-lb)	970 in/lbs
Output Shaft	Solid Shaft
Housing Material	Cast Iron
Overhung Load Rating (Output Shaft(lb))	1,385 lb

General Specifications

UPC	690310047439
Weight	30.00 LB