Modified Stock Gearing - Boston Gear

Roller Chain Drive Tensioners
Type HG
Drive Positioners
The Type HG is an angle-mounted positioner which can be
mounted on any flat horizontal surface. Its variety of sizes provides
advantages not enjoyed from competitive brands.
ORDER BY CATALOG NUMBER OR ITEM CODE
Suggested Catalog Item
Chain Number* Number Code
35, 40, 41 0-HG 48897
40, 50, 60 1-HG 48898
80, 100, 120 2-HG 48899
*Single-strand chain. For multiple strand chain, use larger tensioner.
GREASE
PORT
P
5/16 D
C
A
E
MAX.
F
B
G
H
J
L
C
M
GREASE
FITTING
H
IDLER
SHAFT
O
K
ALL DIMENSIONS IN INCHES
Size A B C D E F G H J K L M O P
0-HG 2-3/4 1/4 1 1/2 1 1-1/2 1-9/16 3-1/16 7/8 2 1-1/2 1--3/8 1-1/2 11/32
1-HG 4 5/16 1-1/2 7/8 1-3/4 2-3/8 2-15/32 4-15/32 1-1/8 3 2 2 2-1/16 13/32
2-HG 5 7/16 1-3/4 1-1/8 2-7/8 3-17/32 3-5/8 6-21/32 1-3/4 4 3 2-1/2 3 9/16
Type UG
Drive Positioners
M
P
The Type UG drive positioner is a fixed idler bracket which
provides chain support. Available in a variety of sizes. Type
UG positioners can be mounted on any flat, vertical surface.
B
J
H
G
F E
MAX.
K
C
A
GREASE
FITTING
K
5/16"
D
IDLER
SHAFT
GREASE
PORT
ORDER BY CATALOG NUMBER OR ITEM CODE
Suggested Catalog Item
Chain Number* Number Code
35, 40, 41 0-UG 48893
40, 50, 60 1-UG 48894
80, 100, 120 2-UG 48895
*Single-strand chain. For multiple strand chain, use larger tensioner.
L
ALL DIMENSIONS IN INCHES
Size A B C D E F G H J K L M P
0-UG 2-3/4 1-1/2 2 1/2 1 1-1/2 7/16 2-3/16 3/4 1 1/4 1-3/8 11/32
1-UG 4 2 3 7/8 1-3/4 2-3/8 9/16 3-1/4 1 1-1/2 5/16 2 13/32
2-UG 5 3 3-1/2 1-1/8 2-7/8 3-17/32 3/4 4-25/32 1-1/2 1-3/4 1/2 2-1/2 9/16
296 Boston Gear 800-825-6544 P-1930-BG 04/10