Keyless High Torque Timing Pulleys - S8M - MechaLock Standard Type Incorporated (with Centering Function)

Brand :

MISUMI

Caution

Regarding RoHS compliance: The products are RoHS non-compliant only when alteration BMC is selected. The products are RoHS-compliant when BMC is not selected. As some parts used in the alteration are RoHS non-compliant, the RoHS notation on this page has been changed to non-compliant. "Non-compliant" is also indicated in the certificate due to information on the left.
Please note that the swaged flange options, NFC, RFC, and LFC, are not reflected in the CAD data.

Product Description

[Material]
· Pulley: Extra super duralumin aluminum alloy, S45C equivalent
· Flange: Aluminum alloy, SPCC
· Bushing: S45C equivalent
[Surface treatment]
· Clear anodize, hard clear anodize (firm hardness 300HV~), electroless nickel plating, black oxide

■S8M

● Pulley Shape

Shape E

Shape F

Standard Tooth Profile

Tooth groove dimensions slightly vary according to the number of teeth. (Pitch: 8.0mm)

■Dimensional Tolerances Without Command

Dimension Range		Tolerance (mm)
Over	or Less	Tolerance (mm)
0.5	3	±0.1
3	6	±0.1
6	30	±0.2
30	120	±0.3
120	400	±0.5

[ ! ]Compliant with JIS B 0405 Class m (intermediate).

*3 For the combination of nominal width and MechaLock inner diameter shown in Table 2, the MechaLock mounting holes are not stepped holes, but are through holes of the MechaLock outer diameter. ([ ! ] Shape E only)
[ ! ] Surface treatment may not be applied to the shaft bores.
[ ! ] Machined flange for 72 toothed pulleys.
[ ! ] Flange is installed.
[ ! ] For orders with no flange, please specify the alteration NFC.
[ ! ] Compatible with S8M type from Mitsuboshi Belting Ltd. as well as Bando Chemical Industries Ltd.
[ ! ] Unless otherwise specified except for teeth and F dimensions, the dimension tolerance conforms to JIS B 0405 Class m.

Table 1: Select Shaft Bore Dia.

d_H7	Max. allowable torque (N⋅m)			D₁	(L)
d_H7	HHTA·HHTK HHTN・HHTT HHTM	HHTP	HHTAS	D₁	(L)
12	44.1	36.2	24.5	28.5	6.5
14	63.7	50.9	28.4	30.5
15	80.4	54.8	30.4	31.5
16	83.3	58.8	—	33.0
17	92.2	76.4	—	33.5
18	95.1	80.3	—	34.5
19	98.1	85.2	—	35.5
20	216.0	183.0	122	42.0	8
22	255.0	201.0	—	44.0
24	363.0	252.0	—	46.0
25	392.0	264.0	153	47.0
28	441.0	295.0	—	50.0	8.5
30	500.0	396.0	230	52.0
32	530.0	423.0	—	54.0
35	883.0	548.0	—	62.0	10
40	1079.0	779.0	—	67.0
45	1285.0	882.0	—	72.0
50	1706.0	1362.0	—	77.0	10.5

■List of MechaLocks by part number

HHTA	HHTK	HHTN	HHTAS	HHTT	HHTM	HHTP
MLM			MLHS	MLM	MLMB	MLMP

Table 2: pulley through hole combination

Nominal Width	MechaLock inner dia. d_H7
S8M150	20·22

■Belt Nominal Width / Dimensions

mm	Nominal
mm	S8M150	S8M250	S8M300	S8M400
A	17	28	33	44
W	22	33	38	49
Y	−	22(up to d22) 24(d24 to 30) 24.5(d32 or more)	24(up to d22) 25(d24 to 32) 28(d35 or more)	30(up to d22) 31(d24 to 32) 34(d35 or more)

■Mechalock bolt tightening torque
(N⋅m)

type	MLM	MLMB	MLMP	MLHS
d
6	3.9	3.2	3.9	2.7
8
10
12
14
15
16
17
18
19
20	8.8	7.5	8.8	5.6
22
24
25
28
30
32
35	15.7	12.7	15.7	9.6
38
40
42
45
48
50

Type	Part number				[M]Material^*1			[S] Surface Treatment
	Belt width: 15 mm	Belt width: 25 mm	Belt width: 30 mm	Belt width: 40 mm	Pulley	Flange	MechaLock	Pulley	Flange	MechaLock
	S8M150	S8M250	S8M300	S8M400
HHTA	●	●	●	●	Extra Super Duralumin Aluminum alloy	Aluminum alloy	S45C Equivalent	Clear Anodize		—
HHTK	●	●	●	●				Hard Clear Anodized ^*2		—
HHTN	●	●	●	●				Electroless nickel plating		—
HHTAS	●	●	●	●			SUS304 Equivalent	Clear Anodize		—
HHTT	●	●	●	●	S45C equivalent	SPCC	S45C Equivalent	—
HHTM	●	●	●	●				Black Oxide Coating
HHTP	●	●	●	●				Electroless nickel plating

*1The above materials and accessories might be changed to the ones equivalent to the originals.
*2 Hard clear anodize: film hardness 300 HV or more