Page 654 - MiSUMi 2025

7 Timing Pulleys S8M 7

Timing Pulleys & Idlers & Belts / Round Belt Pulleys & Idlers & Belts S8M Type Pulley M Material Flange S Surface Treatment Round Belt Pulleys & Idlers & Belts Timing Pulleys & Idlers & Belts /

8mm

E-HTPB
Black Anodized
Timing Pulleys E-HTPA Aluminum Alloy Clear Anodized Pulleys Timing
E-HTPK
Hard Anodized*
P.07-007 E-HTPM Black Oxide Film P.07-007
General Structural Steel
E-HTPP or Carbon Steel Electroless Nickel Plating
Idlers *Film hardness for hard anodized treatment is 300 HV min. Idlers

P.07-033 QPulley Shape 4 B Shape Type & Nominal Width (* dimension) P.07-033
Pulley
Timing Belts 2.5 *W 2.5 *W *L Standard Tooth Profile Type Shape 37 (Number of Timing Belts
Belt
A Shape
A W
L
4
-
A
*A
Teeth 18~40)
of teeth is 44 or more)
P.07-055 W/2 2-M 2.5 *A 2.5 8 (11 when the number 5.20 0.686 S8M150 B A 17 22 42 (Number of P.07-055
Teeth 44~72)
2-M
Round Belt Pulleys & Idlers & Belts P.D. O.D. dH7 E F P.D. O.D. dH7 D E F R0.75 0.686 R5.30 2.83 S8M250 B 28 33 48 (Number of Idlers & Belts Round Belt Pulleys &
-
R0.4
Teeth 18~40)
53 (Number of
Teeth 44~72)
P.07-088 Tooth groove dimensions A - P.07-088
slightly vary according to
the number of teeth. 53 (Number of
(t1.6) S8M300 33 38 Teeth 18~40)
(t1.6) (Pitch: 8.0mm) B 58 (Number of
Teeth 44~72)
A -
QShaft Bore Specs. S8M400 44 49 64 (Number of
Teeth 18~40)
B 69 (Number of
5 H Round Hole 5 P Round Hole + Tap 5 N New JIS Keyway + Tap Teeth 44~72)
QKeyway Size Threaded Hole Size Table
(Shaft Bore Specs: P · N )
bjs9 t
dH7 Shaft Bore ID M (Coarse Thread)
2-R0.2
(120°)
or Less 12 M4
13~17 M5
18~30 M6
HH7 PH7 NH7 dH7
31~45 M8
E No tapped holes or set E For Shape A pulley, the set 46~70 M10
screws. screw hole is set around 120°
to avoid interference with the E For more tap dimensions, refer to the
tooth top. MISUMI website.
N/NK: New JIS (B1301) keyway size table
Shaft Bore Keyway
Spec. Shaft Bore Tolerance b js9 t Tolerance
N 8
+ 0.015 3 ±0.0125 1.4
N 10 0
NK 10 + 0.015 4 ±0.0150 1.8
0
N 11~12 4 1.8 + 0.1
0
N 13~17 + 0.018 5 ±0.0150 2.3
0
N 18 6 2.8
N 19~22 + 0.021 6 ±0.0150 2.8
0
E For more keyway dimensions, refer to the
MISUMI website.
07-015 Timing Pulleys