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Timing Pulleys Keyless/High Torque/S8M (Part Numbers)

Timing Pulleys Keyless/High Torque/S8M

MISUMI

MiSUMi Economy

MISUMI

  • RoHS

Part Number

Configured Part Number is shown.

Product Overview
Usually, timing pulleys and timing belts are widely used to design mechanisms for transmitting rotational power generated by motors.
Driving and transmission are realized through the engagement between the teeth of timing pulleys and timing belts.
Dimensional Drawing
MISUMI Keyless Timing Pulley S8M Specifications Drawing
The shaft bore may not have surface treatment.
Bushings are available in Standard Type (ST Bushing) and Short Type (SH Bushing). Refer to Detailed Specifications of Bushings
Specifications Overview
Part Number Material Surface Treatment
Belt Width 15mmBelt Width 25mmBelt Width 30mmBelt Width 40mmPulleyFlangeBushingPulleyFlangeBushing
A: 17  W: 22A: 28  W: 33A: 33  W: 38A: 44  W: 49
E-HTLA□□S8M150E-HTLA□□S8M250E-HTLA□□S8M300E-HTLA□□S8M400Aluminum Alloy 7A09Aluminum AlloyEquivalent to S45CClear Anodized-
E-HTPL□□S8M150E-HTPL□□S8M250E-HTPL□□S8M300E-HTPL□□S8M400Equivalent to S45CSPCCEquivalent to S45CFerroferric Oxide Protective Film
E-HTLG□□S8M150E-HTLG□□S8M250E-HTLG□□S8M300E-HTLG□□S8M400Electroless Nickel Plating
Film hardness of hard clear anodize is 300HV~.
If there are requirements for rust prevention, give priority to products with surface treatment of electroless nickel plating on other pages.
Specification Table
Part NumberPulley
Shape		dH7 range (select Shaft Bore Dia. according to Table 1)P.D.O.D.FE
S8M150S8M250S8M300S8M400
TypeNumber of TeethType & Nominal WidthShape E
(ST Bushing)		Shape F
(SH Bushing)		Shape E
(ST Bushing)		Shape F
(ST Bushing)
(SH Bushing)		Shape E
(ST Bushing)		Shape F
(ST Bushing)
(SH Bushing)		Shape E
(ST Bushing)		Shape F
(ST Bushing)
E-HTLA
E-HTPL
E-HTLG		18S8M150
＊A：17
＊W：22

S8M250
＊A：28
＊W：33

S8M300
＊A：33
＊W：38

S8M400
＊A：44
＊W：49		E

F		12-1212----45.8444.465236
1912・14・151212・14・1512・14・151515--48.3847.015540
2012~171212~1712・14・1515・16・1715--50.9349.5658
2112~171212~1712~1715・16・1715・16・1716・1716・1753.4852.16145
2212~171212~1712~1715・16・1715・16・1716・1716・1756.0254.65
2412~171212~1712~1715・16・1715・16・1716・1716・1761.1259.746750
2512~251212~2512~2515~2515~2516~2516~2563.6662.297056
2614~25-14~2514~2515~2515~2516~2516~2566.2164.847458
2814~2514~2514~2515~2515~2516~2516~2571.369.938060
3014~3214~3214~3215~3215~3216~3216~3276.3975.028767
3214~3214~3214~3215~3215~3216~3216~3281.4980.12
3416~3516~3516~3516~3516~3516~3516~3586.5885.219575
3616~3816~3816~3516~3816~3516~3816~3891.6790.39980
3816~4216~4216~3516~4216~3516~4216~4296.7795.3910484
4020~4220~4220~3520~4220~3520~4220~42101.86100.4911190
4420~4220~4220~3520~4220~3520~4220~42112.05110.67119100
4820~4220~4220~3520~4220~3520~4220~42122.23120.86127105
5020~50-20~5020~3520~5020~3520~5020~42127.32125.95135115
6020~5020~5020~3520~5020~3520~5020~42152.79151.42160140
Select Shaft Bore Dia. according to Table 1

■Table 1: Shaft Bore Dia. Selection
dH7Allowable max. torque N・mD(L)
ST BushingSH BushingST BushingSH Bushing
124823323110.5
1473-35-12
157836
16833713
178838
181544314
1916345
2017146
2218648
2420650
2521652
283535415.5
3038257
32412163595816.5
354511736361
38686-70-19
4072571
427577420
4514908424.5
48160087
50166089
Using a bushing with electroless nickel plated surface reduces maximum allowable torque and axial load by 20%-30%.
Product Features
Features of MISUMI Keyless Timing Pulleys
Feature 1: Keyless timing pulleys require no keyway machining, and round shaft and round hole can be used directly.
    Urgent design changes can be made due to the reduction of cutting and machining time.
MISUMI keyless timing pulleys can accommodate urgent design changes

Feature 2: Keyless timing pulleys are connected with bolts only, allowing for easy installation and removal.
    Equipment maintenance can be easily carried out without using a special tool. Parts are reusable, effectively reducing the cost.
MISUMI keyless timing pulleys are easy to install and remove

Feature 3: Keyless timing pulleys enable free alignment at any position during assembly.
    Alignment control is possible during assembly, thus eliminating the need to align the key and tooth in the design phase.
Keyless timing pulleys, free alignment

Feature 4: Keyless timing pulleys have no loosening. When a key is used, the keyway becomes loose, but there is no gap in the keyless bushing. It is therefore suitable for places where there are repeated forward and reverse rotations.
    Long-term high coaxiality connection can be achieved. Suitable for servo motors and other places where there are repeated forward and reverse rotations.
Keyless timing pulleys, no loosening
Usage Method
■Mounting method for keyless timing pulleys
①Wipe off the stains on the shaft surface and apply a layer of lubricant or grease. (Do not use any lubricant or grease that contains molybdenum abrasion inhibiting agent.)
②Also wipe the contact surface between the timing pulley and the bushing, and apply lubricant or grease. In addition, the fastening bolt thread surface and bearing surface must be applied lubricant or grease.
③Insert the timing pulley and bushing into the shaft after temporary assembly. (Do not tighten the bushing directly with the bolt without putting it through the shaft.)
④After positioning is completed, tighten the bolts gently (about 1/4 of the specified tightening torque) and diagonally in sequence with a torque wrench.
⑤Tighten with increased tightening torque (about 1/2 of the specified tightening torque).
⑥Tighten again to the specified tightening torque.
⑦Tighten the fastening bolt circumferentially in sequence.

■Disassembly method for keyless timing pulleys
①Work with the unit at a complete stop.
②Loose the fastening bolt circumferentially in sequence
③Insert the bolt into the threaded hole for disassembly and evenly screw it in.
④When reinstalling, repeat the steps in “Installation”.
Precautions
① If there are requirements for rust prevention, give priority to products with surface treatment of electroless nickel plating on other pages.
  Please refer tosurface treatment and rust prevention methods
② When installing a keyless bushing, be sure to apply lubricant or grease to the shaft surface, the contact surface between the pulley and the bushing, and the fastening bolt.
  Otherwise it will not be securely tightened and may cause the shaft to idle.
③ Tighten the bolt after inserting the bushing into the shaft. (If the bolts is tightened before inserting the bushing, it will cause deformation of the bushing.)
④ Use a torque spanner to tighten the bolts.
⑤ Do not use bolts other than those supplied.
Example of Use
MISUMI Keyless Timing Pulley Example
■Mechanism name
Dustproof Lifting Machine

■Mechanism function
Lifting machine for heavy workpieces
Use in dusty places

■Function of Keyless Timing Pulleys
Rotates ball screws by means of a keyless toothed timing belt, lifting and lowering the positioning stage

For details, please click Dustproof Lifting Machine
Application Industries
Smart Phones Medical Electronic & Electrical
MISUMI keyless timing pulleys are applicable to the smart phone industry MISUMI keyless timing pulleys are applicable to the medical industry MISUMI keyless timing pulleys are applicable to the electronics and electrical appliances industry
Automotive Robotics Lithium battery
MISUMI keyless timing pulleys are applicable to the automotive industry MISUMI keyless timing pulleys are applicable to the robotics industry MISUMI keyless timing pulleys are applicable to the lithium battery industry
Related Products
Flat-belt idlers, Width (T), 6 to 32 mm Flat Belts For General Use High Torque Timing Pulleys S2M Type
MISUMI Idlers for Flat Belts MISUMI Idlers for Flat Belts MISUMI High Torque Timing Pulleys S2M Type
Representative model: HBG15-6 Representative model: HBLT350-4.23 Representative model: HTPA48S2M040-B-N10
Advantages: short delivery time, multiple types Advantage: custom size Advantages: short delivery time, multiple types

Related Documents
Technical Data of Toothed Timing Belts and Timing Pulleys
①Data on the selection of timing pulleys and timing toothed belts, tensioning force, etc. (drive).
②Data on the selection of timing pulleys and timing toothed belts, tensioning force, etc. (transmission & conveyance).
③Main causes and countermeasures for the damage, breakage, abnormal noise of toothed timing belts.
④Reference data on the replacement time of toothed timing belts.
⑤Data on dimensional tolerance of timing pulleys.

Part Number 

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Part Number
E-HTPL40S8M250-F-[20,​22,​24,​25,​28,​30,​32,​35]
E-HTPL40S8M300-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL40S8M300-F-[20,​22,​24,​25,​28,​30,​32,​35]
E-HTPL40S8M400-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL40S8M400-F-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL44S8M150-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL44S8M250-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL44S8M250-F-[20,​22,​24,​25,​28,​30,​32,​35]
E-HTPL44S8M300-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL44S8M300-F-[20,​22,​24,​25,​28,​30,​32,​35]
E-HTPL44S8M400-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL44S8M400-F-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL48S8M150-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL48S8M250-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL48S8M250-F-[20,​22,​24,​25,​28,​30,​32,​35]
E-HTPL48S8M300-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL48S8M300-F-[20,​22,​24,​25,​28,​30,​32,​35]
E-HTPL48S8M400-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL48S8M400-F-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL50S8M150-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42,​45,​48,​50]
E-HTPL50S8M250-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42,​45,​48,​50]
E-HTPL50S8M250-F-[20,​22,​24,​25,​28,​30,​32,​35]
E-HTPL50S8M300-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42,​45,​48,​50]
E-HTPL50S8M300-F-[20,​22,​24,​25,​28,​30,​32,​35]
E-HTPL50S8M400-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42,​45,​48,​50]
E-HTPL50S8M400-F-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
E-HTPL60S8M150-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42,​45,​48,​50]
E-HTPL60S8M250-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42,​45,​48,​50]
E-HTPL60S8M250-F-[20,​22,​24,​25,​28,​30,​32,​35]
E-HTPL60S8M300-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42,​45,​48,​50]
E-HTPL60S8M300-F-[20,​22,​24,​25,​28,​30,​32,​35]
E-HTPL60S8M400-E-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42,​45,​48,​50]
E-HTPL60S8M400-F-[20,​22,​24,​25,​28,​30,​32,​35,​38,​40,​42]
Part NumberStandard Unit PriceMinimum order quantityVolume DiscountDays to ShipBelt Width Used
(mm) 		Pulley Shape Material Surface Treatment Number of Teeth Shaft Bore Dia. [d]
(mm)

-

1 Piece(s) 7 Day(s) 25Shape F[Steel] S45C EquivalentBlack Oxide Coating4020 ～ 35

-

1 Piece(s) 7 Day(s) 30Shape E[Steel] S45C EquivalentBlack Oxide Coating4020 ～ 42

-

1 Piece(s) 7 Day(s) 30Shape F[Steel] S45C EquivalentBlack Oxide Coating4020 ～ 35

-

1 Piece(s) 7 Day(s) 40Shape E[Steel] S45C EquivalentBlack Oxide Coating4020 ～ 42

-

1 Piece(s) 7 Day(s) 40Shape F[Steel] S45C EquivalentBlack Oxide Coating4020 ～ 42

-

1 Piece(s) 7 Day(s) 15Shape E[Steel] S45C EquivalentBlack Oxide Coating4420 ～ 42

-

1 Piece(s) 7 Day(s) 25Shape E[Steel] S45C EquivalentBlack Oxide Coating4420 ～ 42

-

1 Piece(s) 7 Day(s) 25Shape F[Steel] S45C EquivalentBlack Oxide Coating4420 ～ 35

-

1 Piece(s) 7 Day(s) 30Shape E[Steel] S45C EquivalentBlack Oxide Coating4420 ～ 42

-

1 Piece(s) 7 Day(s) 30Shape F[Steel] S45C EquivalentBlack Oxide Coating4420 ～ 35

-

1 Piece(s) 7 Day(s) 40Shape E[Steel] S45C EquivalentBlack Oxide Coating4420 ～ 42

-

1 Piece(s) 7 Day(s) 40Shape F[Steel] S45C EquivalentBlack Oxide Coating4420 ～ 42

-

1 Piece(s) 7 Day(s) 15Shape E[Steel] S45C EquivalentBlack Oxide Coating4820 ～ 42

-

1 Piece(s) 7 Day(s) 25Shape E[Steel] S45C EquivalentBlack Oxide Coating4820 ～ 42

-

1 Piece(s) 7 Day(s) 25Shape F[Steel] S45C EquivalentBlack Oxide Coating4820 ～ 35

-

1 Piece(s) 7 Day(s) 30Shape E[Steel] S45C EquivalentBlack Oxide Coating4820 ～ 42

-

1 Piece(s) 7 Day(s) 30Shape F[Steel] S45C EquivalentBlack Oxide Coating4820 ～ 35

-

1 Piece(s) 7 Day(s) 40Shape E[Steel] S45C EquivalentBlack Oxide Coating4820 ～ 42

-

1 Piece(s) 7 Day(s) 40Shape F[Steel] S45C EquivalentBlack Oxide Coating4820 ～ 42

-

1 Piece(s) 7 Day(s) 15Shape E[Steel] S45C EquivalentBlack Oxide Coating5020 ～ 50

-

1 Piece(s) 7 Day(s) 25Shape E[Steel] S45C EquivalentBlack Oxide Coating5020 ～ 50

-

1 Piece(s) 7 Day(s) 25Shape F[Steel] S45C EquivalentBlack Oxide Coating5020 ～ 35

-

1 Piece(s) 7 Day(s) 30Shape E[Steel] S45C EquivalentBlack Oxide Coating5020 ～ 50

-

1 Piece(s) 7 Day(s) 30Shape F[Steel] S45C EquivalentBlack Oxide Coating5020 ～ 35

-

1 Piece(s) 7 Day(s) 40Shape E[Steel] S45C EquivalentBlack Oxide Coating5020 ～ 50

-

1 Piece(s) 7 Day(s) 40Shape F[Steel] S45C EquivalentBlack Oxide Coating5020 ～ 42

-

1 Piece(s) 7 Day(s) 15Shape E[Steel] S45C EquivalentBlack Oxide Coating6020 ～ 50

-

1 Piece(s) 7 Day(s) 25Shape E[Steel] S45C EquivalentBlack Oxide Coating6020 ～ 50

-

1 Piece(s) 7 Day(s) 25Shape F[Steel] S45C EquivalentBlack Oxide Coating6020 ～ 35

-

1 Piece(s) 7 Day(s) 30Shape E[Steel] S45C EquivalentBlack Oxide Coating6020 ～ 50

-

1 Piece(s) 7 Day(s) 30Shape F[Steel] S45C EquivalentBlack Oxide Coating6020 ～ 35

-

1 Piece(s) 7 Day(s) 40Shape E[Steel] S45C EquivalentBlack Oxide Coating6020 ～ 50

-

1 Piece(s) 7 Day(s) 40Shape F[Steel] S45C EquivalentBlack Oxide Coating6020 ～ 42

Loading...

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Basic Information

Type Keyless Bushings Belt Type S8M

Configure

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393 Part Numbers

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Specification/Dimensions

  • Belt Width Used(mm)

    • 15
    • 25
    • 30
    • 40

    Clear

  • Pulley Shape

    • Shape E
    • Shape F

    Clear

  • Material

    • Steel
      • S45C Equivalent
    • Aluminum
      • Aluminum Alloy

    Clear

  • Surface Treatment

    • Black Oxide Coating
    • Clear Anodize
    • Electroless Nickel Plating

    Clear

  • Number of Teeth

    • 18
    • 19
    • 20
    • 21
    • 22
    • 24
    • 25
    • 26
    • 28
    • 30
    • 32
    • 34
    • 36
    • 38
    • 40
    • 44
    • 48
    • 50
    • 60

    Clear

  • Shaft Bore Dia. [d](mm)

    • 12
    • 14
    • 15
    • 16
    • 17
    • 18
    • 19
    • 20
    • 22
    • 24
    • 25
    • 28
    • 30
    • 32
    • 35
    • 38
    • 40
    • 42
    • 45
    • 48
    • 50

    Clear

  • type

    • E-HTLA□□S8M
    • E-HTLG□□S8M
    • E-HTPL□□S8M

    Clear

  • CAD

    • 2D
    • 3D

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Days to Ship

    • All
    • 7 Day(s) or Less

    Clear

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