Timing Pulleys - AT5 / AT10 Type

■AT5

● Pulley Shape

Shape A

Shape B

Standard Tooth Profile

Tooth groove dimensions slightly vary according to the number of teeth. (AT5 Pitch: 5.0mm)

■Belt Nominal Width / Dimensions

mm	Nominal
	AT5100	AT5150
A	11.6	16.6
W	16.5	21.5
L Number of Teeth: 15, 16	25.0	30.0
L Number of Teeth: 18 to 28	27.0	32.0
L Number of Teeth: 30 to 60	29.0	34.0

■Tapped Hole Dimensions (Shaft Bore Specs.: P, N, C)

dH7 Shaft Bore I.D.	M (Coarse)	Accessory Set Screws
5	M3	M3 × 3
6 to 12	M4	M4 × 3
13 to 17	M5	M5 × 4
18 to 30	M6	M6 × 5
31 to 45	M8	M8 × 6
46 to 50	M10	M10 × 8

* 1 Shaft Bore Specs. H (Round Hole), V or F (Stepped Hole), Y (Both Sides Stepped Hole) and WB (Two-stepped Hole) do not have tapped holes.
[ ! ] The tolerance of the tap position dimension from the boss end face and pulley end face is ±0.3.
[ ! ] Unless otherwise specified except for teeth and F dimensions, the dimension tolerance conforms to JIS B 0405 Class m.

Shaft Bore Specification Select shaft bore spec mark and each dim. from the table below. [!] Surface treatment may not be applied to the shaft bores.

H round hole

P Round Hole + Tap

N New JIS Keyway + Tap
C Old JIS Keyway + Tap

[ ! ] For A-Shape pulley, the screw
holes are set at around 90° to keep
away from peaks.

V stepped hole

F Stepped Hole
(Counterbored Hole on the Hub Side)

Y Both Ends Stepped Hole

WB Two-stepped hole

[ ! ] Z - d ≥ 2
[!] Shape A: 2.0 ≤ J ≤ W－2.0
　　Shape B: 2.0 ≤ J ≤ L－2.0

[ ! ] Applicable to Shape B only
[ ! ] Z - d ≥ 2
[ ! ]2.0 ≤ J ≤ L－2.0

[ ! ] Applicable to Shape A only
[ ! ] Q (R)－Y (d) ≥ 2
[ ! ]S+T ≤ W－3.0
[ ! ]S (T) ≥ 3.0

[ ! ] Applicable to Shape A only
[ ! ]Q－R ≥ 2
[ ! ] R－WB (d) ≥ 2
[ ! ]S+T ≤ W－3.0
[ ! ]S (T) ≥ 3.0