RS25 • BF25H
RS25/BF25H U.S. Tsubaki RS25 bushed chain is the smallest ANSI roller chain. It is ideal for power transmission in business machines, electro-optical equipment, and precision and general industrial machines where relatively large space is allowed for miniature drives. U.S. Tsubaki BF25H bushed chain works with standard sprockets. It is a flat side-bar chain, and its inner link plates are thicker than RS25. These chains can accommodate a large allowable load and are widely used for driving motorcycle cam shafts and power transmission machinery in general.
ANSI No.
Pitch
Bushing Diameter
Width
Link Plate
Pin
U.S. TSUBAKI
Between Inner Link Plates
Diameter
P
B
W T
t
H
h
D
Chain No.
RS25
25
.250
.130 .130
.125 .125
.030 .039
— .230
.199
.0905
BF25H
— .250
.030
.230
— .0905
❈
Number
Transverse
Type
Minimum Average Maximum Approx.
Number
U.S. TSUBAKI
of
Pin
Pitch
of
Ultimate
Tensile
Allowable
Weight lbs./ft.
of
Strands
Pin
Strength Strength
Load lbs.
Links
ANSI
lbs.
per
Standard
100 ft.
L 1 + L 2
L 1
L 2
C
Chain No.
lbs.
RS25
1 2 1
.339 .591 .362
.150 .276 .161
.189 .315 .201
— Riveted
780
1,050
140 240 170
.09 .18 .11
480 480 480
RS25-2 BF25H
.252 Riveted 1,560 2,100
— Riveted
— 1,320
Note: Only two-pitch offset links are available for RS25 and RS25-2. No offset links are available for BF25H. Refer to page A-44, “Chain Selection.” ❈
A-46
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