Back to the Category Toothed Pulleys/Timing Pulleys/Idler Pulleys

Technical Drawing - Toothed Pulleys/Timing Pulleys/Idler Pulleys

High Torque Timing Pulleys - S8M: Related Image

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

■S8M

● Pulley Shape

Standard Tooth Profile

Shape A

[ ! ]1

[ ! ]2

Shape B

[ ! ]1

[ ! ]2

Open the technical drawing in the new window

Available dimensions and tolerances can be found under the tab More Information.

Basic Properties (e.g., material, hardness, coating, tolerance) - Toothed Pulleys/Timing Pulleys/Idler Pulleys

■Belt Nominal Width / Dimensions

mm	Nominal
mm	S8M150	S8M250	S8M300	S8M400	S8M600
A	17	28	33	44	65
W	22	33	38	49	70
L (Number of Teeth: 18 to 43)	37	48	53	64	85
L (Number of Teeth: 44 to 72)	42	53	58	69	90

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

d_H7 Shaft Bore I.D.	M (Coarse)	Accessory Set Screws
12	M4	M4 × 3
13 to 17	M5	M5 × 4
18 to 30	M6	M6 × 5
31 to 45	M8	M8 × 6
46 to 70	M10	M10 × 8

[ ! ] For aluminum flanges, the flange thickness is 1.5.
[ ! ] 1 t = 2.0 for 72 toothed pulleys (Machined Flange)
[ ! ] 2 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.
[ ! ] For S8M600, select Shape A: W ≤ d × 5 and Shape B: L ≤ d × 5.
[ ! ] 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 120° 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

High Torque Timing Pulleys - S8M: Related Image

High Torque Timing Pulleys - S8M: Related Image

High Torque Timing Pulleys - S8M: Related Image

High Torque Timing Pulleys - S8M: Related Image

[ ! ] Z - d ≥ 2

[ ! ] 3.0 ≤ J ≤ W－3.0
(S8M600 only) 5 ≤ J ≤ W－5.0

[ ! ] Applicable to Shape B only
[ ! ] Z - d ≥ 2

[ ! ] 3.0 ≤ J ≥ L－3.0
(S8M600 only) 5 ≤ J ≤ L－5.0

[ ! ] Applicable to Shape A only
[ ! ] Q (R)－Y ≥ 2

[ ! ] S+T ≤ W－3.0
(S8M600 only) S+T ≤ W−5.0

[ ! ] S (T) ≥ 3.0
(S8M600 only) S (T) ≥ 5.0

[ ! ] Applicable to Shape A only
[ ! ] Q－R ≥ 2
[ ! ] R－WB ≥ 2

[ ! ] S+T ≤ W－3.0
(S8M600 only) S+T ≤ W−5.0

[ ! ] S (T) ≥ 3.0
(S8M600 only) S (T) ≥ 5.0

■Types Table

Type	Belt Width					[M] Material		[S] Surface Treatment	[A] Accessory Set Screws
	15 mm	25 mm	30 mm	40 mm	60 mm	Pulley	Flange
	S8M150	S8M250	S8M300	S8M400	S8M600	Pulley	Flange
HTPA	●	●	●	●	●	Extra Super Duralumin Aluminum alloy	Aluminum alloy	Clear Anodize	EN 1.4301 Equiv.
HTPB	●	●	●	●	●			Black Anodize
HTPK	●	●	●	●	●			Hard Clear Anodize
HTPN	●	●	●	●	●			Electroless nickel plating
HTPT	●	●	●	●	●	EN 1.1191 Equiv.	EN 1.0330 Equiv.	—	EN 1.7220 Equiv. (Black Oxide)
HTPM	●	●	●	●	●			Black Oxide Coating
HTPP	●	●	●	●	●			Electroless nickel plating
HTPS	●	●	●	—	—	EN 1.4301 Equiv.	EN 1.4301 Equiv.	—	EN 1.4301 Equiv.

[ ! ]Flange is already swaged, and set screws are included for Shaft Bores P, N and C.

Further specifications can be found under the tab More Information.

Composition of a Product Code - Toothed Pulleys/Timing Pulleys/Idler Pulleys

Part number

—

Pulley Shape

—

Shaft Bore Specs.: I.D.

—

Z

—

J

—

Q

—

R

—

S

—

T

(Shaft Bore Specs.: H, P, N, C)

HTPA36S8M250

—

A

—

H65

(Shaft Bore Specs.: V, F)

HTPA30S8M300

—

B

—

V20

—

Z38

—

J23.0

(Shaft Bore Specs.: Y, WB)

HTPA40S8M250

—

A

—

Y30

—

Q62

—

R47

—

S16

—

T9

Alterations - Toothed Pulleys/Timing Pulleys/Idler Pulleys

Part number

—

Pulley Shape

—

Shaft Bore Specs.: I.D.

—

Z

—

J

—

Q

—

R

—

S

—

T

—

(KC90, etc.)

HTPA60S8M250

—

A

—

H65

—

KSC80−K8

Alterations	Set Screw Angle Change	No Flange	Single Flange	Flange Cut
Code	KC90	NFC	RFC·LFC	FC
Spec.	Changes an angle of set screw to 90°. [ ! ] For A-Shape pulley, the screw holes are set at around 90° to keep away from peaks.	(Flange 2 pcs. Included) Ordering Code NFC	(Flange 1 pc. Included) Ordering Code RFC	Cut the flange O.D. in 0.5 mm increments. Ordering Code FC17 Application Notes [ ! ]FC ≥ (O.D.) +1 [ ! ]FC ≤ F−2 [ ! ] No surface treatment is applied on flange circumference.

Alterations

Retaining Ring Groove

Taper for Bearing Holder

Hub Shortening

Tapped Hole Dimensions

Included Set Screw Length Change

Code

SRG

BTC

BC

TPC

SLH

Spec.

Retaining Ring Groove applicable to the shaft dia. of stepped hole is machined.

Specify SRG 2.5 to 40.5 mm
0.5 mm Increments

Applicable Conditions [ ! ] Minimum Thickness: 2 mm
[ ! ] Applicable to Shaft Bore Specs. V and F only
[ ! ] Standards of retaining ring groove for Z dim. is applied
[ ! ] n ≤ J−SRG−m
Ordering Code SRG7

Taper for retaining bearing inner ring

Ordering Code BTC15-TL4
Application Notes
[ ! ] Applicable to Shape A only
[ ! ] Applicable to Shaft Bore Specs. H and P only
[ ! ]TL < L−W

[ ! ] When E-D ≤ 6, one side installed
and 1 pc. of flange included

Cuts the hub length in 0.5 mm increments.
Ordering Code BC6.5

Application Notes

[!] Shaft Bore Specs. H, V, F:
3 ≤ BC < L－W

[!] Shaft Bore Specs. P, N, C:
M+3 ≤ BC < L−W

[NG] Not applicable to Shape A

Ordering Code TPC5
Application Notes

[ ! ] Applicable to Shaft Bore Specs. P, N, C only

M	TPC
M4	M5
M5	M4·M6
M6	M5·M8
M8	M6·M10
M10	M8

Ordering Code SLH10
Application Notes

[ ! ] Applicable to Shaft Bore Specs. P, N, C only

Set Screws	SLH
M4 × 3	5·8
M5 × 4	6·10
M6 × 5	10
M8 × 6	10·12
M10 × 8	12·15

Alterations	Add Side Holes [!] Conditions may vary depending on the shaft bore specs.
Alterations	Side Tapped Hole	Side Through Hole	Side Counterbored
Code	QTC·QFC·QSC	KTC·KFC·KSC	ZTC·ZFC·ZSC
Spec.	Machines tapped hole on the side surface of hub side. Ordering Code QTC28−M4 Q□C Selection Specify the hole position (P. C. D. dim.). M Selection M3, M4, M5, M6, M8 Application Notes [ ! ] Minimum Thickness: 2 mm [!] Conditions may vary depending on the shaft bore specs. (6 Locations) (4 Locations) (3 Locations)	Machines through hole on the side surface. Ordering Code KTC28−K4.5 K□C Selection Specify the hole position (P. C. D. dim.). Specify K K4.0 to 13.0 (0.5 mm Increments) Application Notes [ ! ] Minimum Thickness: 2 mm [!] Conditions may vary depending on the shaft bore specs. (6 Locations) (4 Locations) (3 Locations)	Machines counterbored hole on the side surface. Ordering Code ZTC28−ZM4 Z□C Selection Specify the hole position (P. C. D. dim.). ZM Selection ZM3, ZM4, ZM5, ZM6, ZM8 Application Notes [ ! ] Minimum Thickness: 2 mm [!] Conditions may vary depending on the shaft bore specs. (6 Locations) (4 Locations) (3 Locations)

Here to the Overview of Options as PDF .

General Information - Toothed Pulleys/Timing Pulleys/Idler Pulleys

Toothed pulley - synchronous pulley - belt pulley - product assortment

Selection details of toothed pulleys/timing pulleys/idler pulleys

- Material: aluminum, steel, stainless steel (stainless steel), plastic

- Coatings: uncoated, burnished, anodized, nickel-plated

- Profile form: 1.5GT, 2GT, 3GT, 5GT, P2M, P3M, P5M, P8M, S2M, S3M, S5M, S8M, S14M, T2.5, T5, T10, AT5, AT10, 5M, 8M, 14M, 8YU, H, L, MXL, XL, PowerGrip GT3: MR2, MR3, MR5

- ISO tolerances: H7

- Belt width (mm): 4, 4.8, 6, 6.4, 7, 7.9, 9, 9.5, 10, 12, 12.7, 15, 18, 19.1, 20, 25, 25.4, 26, 28, 30, 31, 38,1, 40, 50, 50.8, 53, 60, 74, 76.2, 100

- Belt width (inches): 0.19, 0.25, 0.31, 0.37, 0.5, 0.75, 1, 1.5, 2

- Number of teeth: 10 to 72

Description/Basics

The toothed pulley for mechanical engineering is intended for the transmission of force and torque. Timing pulleys enable a gear ratio of speeds through belt pulleys of different sizes. Timing pulleys are more efficient, durable and significantly more maintenance-friendly compared to chain transmissions.

How much torque and load a timing pulley can transmit depends on the width of the belt. The width of the belt must be calculated. It is recommended to ensure the belt is correctly tensioned. MISUMI already offers the suitable idler pulley and return rollers with integrated ball bearings. For design and design help follow this link.

Different profile shapes of the toothed belts and belt pulleys are responsible for the transmission of power. Depending on the positioning accuracy, the applied torque and the conveying weight, MISUMI offers the fitting pulley. Toothed belt drives are generally used in the industry in three areas:
Positioning: Timing pulleys is often used in 3D printers. A toothed pulley with a semi-circular profile (e.g., GT) is often used for the required position accuracy of a 3D printers. The round shape offers the benefit of little play when the direction changes.
Drive: toothed pulleys are also used for high torque. In most cases, a timing pulley with a rounded trapezoidal profile (e.g., S8M) is used. These are particularly well suited for the transmission of high forces, which occur in drives of various applications in order to drive mechanical components.
Conveying: toothed pulleys can also be used for transporting loads. A straight trapezoidal profile is often used for this purpose (e.g., AT). This toothed pulley shape offers a large surface for loading and transmitting of loads.

Which toothed pulley or timing pulley is the right one for your application depends on the respective task of the toothed belt drive. Different toothed disc profiles have proven themselves for each type of application.

Various bore hole shapes and fastening variants are available for shaft mounting. These allow fastening via set screws, keyways and by means of Mecha locks. Fastening via a clamping sleeve has the further advantage that it allows adjusting the alignment continuously. The MISUMI product assortment has these ready-to-install.

Application Examples - Toothed Pulleys/Timing Pulleys/Idler Pulleys

Application example: idler pulley - idler pully toothed with chain tensioner - toothed pulley with chain tensioner

Application example: idler pulley
(1) Idler pulleys, (2) chain tensioner

Application example: return roller - return roller with cantilever pin - synchronous pulley with on-board disc - toothed pulley with on-board disc

Application example: deflection roller
S (1) Toothed pulleys with crimp disc, (2) nut, (3) washer, (4) cantilever shaft, (5) retaining ring

Application example: synchronous pulleys - toothed pulleys with toothed belts - toothed pulley with screw-on clamp

Application example: timing pulleys
(1) Flat head screw, (2) Timing pulley, (3) Timing belt, (4) Screw-on terminal

Application example: toothed belt drives - toothed pulleys with crimp disc - idler pulley with crimp disc - tensioning of the toothed belt

Application example: of toothed belt drives
(1) Toothed belt, (2) driven toothed pulley with crimp disc, (3) idler pulley with crimp disc, (4) driving toothed pulley with crimp disc

Industrial Applications

3D printer industry

Automotive industry

Pharmaceutical industry

Packaging industry