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Stopper Bolts - Shoulder Type (PSSTH8-20)

Stopper Bolts - Shoulder Type PSSTH8-20

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MISUMI

MISUMI

Use for receiving workpieces.
There are 2 type of material, urethane and resin.

(i)Caution

  • [Specification Change] The materials, appearances, and plastic mounting methods of USTH, SUSTH, PSST, and PSSTH will be changed sequentially starting in July 2025. Some part numbers are not subject to specification changes. Please see here for details. There is a possibility that products and packages before and after the change may be mixed in the same shipment, but there will be no problems with use.
  • Please check the content on our website as the PDF does not contain the most up-to-date information.

PDFP.1-1721-2014

Part Number

Configured Part Number is shown.

PSSTH8-20

Dimensional Drawing


Standard Straight Hex Socket Straight Standard Type, SR Hex Socket Type, SR [ ! ]Incomplete threaded portion of 2 x pitch is under the neck.
M
(Coarse)		DB(C)Hhtt1m(ℓ)B1SR
33.55.56.420.71.521.8--3.5
4578.12.81.52.22.42.225
5689.23.52.33.22.82.56
681011.54222.63.6338
81013155.52.854410
10131719.673.265513
12151921.983.57--15

Product Specifications

StandardHex Socket TypeStopperScrew[A]Accessory (Hex nut)Resin, rubber
How to mount
Straight
Shape		SR ShapeStraight
Shape		SR Shape[M] Material[ H ] HardnessOperating temperature
(°C) reference value		[M] MaterialStrength class[S] Surface treatment[M] Material[S] Surface treatment
USTUSRT—USRTHUrethane (Black)Shore A90-20 to 70SCM43510.9Trivalent Chromate
SS400
Trivalent ChromateFused
(Thermosetting bonded)
SUSTSUSRT—SUSRTHSUS304-—
SUS304 Equivalent
—
——USTH—Urethane (Black)Shore A90-20 to 70SCM435
Equivalent		10.9Trivalent ChromateSS400Trivalent ChromateBonded
(Ambient temperature bonded)
——SUSTH—SUS304-—SUS304 Equivalent—
LUST———Low Repulsion Urethane (Gray)Shore A70-20 to 70SCM43510.9Bright chromate plating*²
SS400
Trivalent ChromateFused
(Thermosetting bonded)
PUST—PUSTH—Polyacetal
(white)		—70 or less*¹SCM43510.9Trivalent Chromate
SS400
Trivalent ChromateBonded
(Ambient temperature bonded)
PSST—PSSTH—SUS304-—
SUS304 Equivalent
—
USTS———Silicon
(light gray)		Shore A7070 or less*¹SCM43510.9Trivalent Chromate
SS400
Trivalent ChromateFused
(Thermosetting bonded)
SSTS———SUS304-—
SUS304 Equivalent
—
*1 The operating temperature is a reference value.
     The operating temperature of polyacetal/silicon is affected by the adhesive.
*2 Bright chromate plating for LUST is being switched to trivalent chromate.
[ ! ]Only the urethane stopper part at the tip is not sold. (Standard products are not available)

Part Number Display Method

Part Number-L
UST8-40

Specification Table

Part NumberL Selection
TypeM (Coarse)
StandardHex Socket Type 3152025303540    
(Standard)(SR)(Hex Socket)(SR) 4152025303540    
USTUSRTUSTHUSRTH
SUSTSUSRTSUSTHSUSRTH
LUST    51520253035404550  
PUST PUSTH  6 2025303540455060 
PSST PSSTH  8 2025303540455060 
USTS   10 202530354045506070
SSTS   12   30 40 506070
[ ! ] It is up to SR shape M10.

Selection Supporting Information

Mass (g)Part Number
Reference values
MLUSTSUSTLUSTPUSTUSRTSUSRTPSSTUSTSSSTSUSTHSUSTHPUSTHPSSTHSUSRTHUSRTH
3151111111————————
201212111————————
252122222————————
301112222————————
351222222————————
402222222————————
415222223222222222
20333333323222222
25333333333334333
30443333333344333
35444444444444444
40444444544444444
515444444444343444
20444454444444444
25555555555555455
30656565566555555
35666667666666666
407777777715777677
45777877777777788
50888888888888888
620777777777666777
25888888788777777
30998989898889828
35101099109999999999
4010101091110101111101010101010
45111111111111101111111110111111
50121212121212121212121211121212
60141414141414131413151413141313
820151515161515151515141414141414
25161716161717161616161615151616
30181818181818181818171717171717
35191919201920201919191918191919
40212121212121212121202020202020
45222222222223232323222222222221
50242424242425242425242423232424
60272727272828272727272727272727
102029292929292928——282828272727
2532313132323131——303030303030
3034343434343433——333332323233
3536363636373635——353435353535
4039393939393938——373736373837
4541424142424141——404040394040
5044444344444444——434242424243
6049494848494948——474747464647
7054545353545453——535253525252
123048494848494848————————
4056555555565655————————
5077636262636363————————
6070707070707069————————
7077387622777777————————

Cautions/prohibitions

Tightening shaft force and fatigue limit when fastening with bolts

  • Calculation of the appropriate tightening axial force when tightening bolts should be within the elastic range of up to 70% of the specified capacity for the torque method.
  • The fatigue strength of the bolt due to repeated loading should not be over the allowable value.
  • The objects tightened should not be caved in on the bolt and nut seating surfaces.
  • The objects tightened should not be damaged due to tightening.
 

The torque method, torque gradient method, angle of rotation method, and elongation measurement method are available as bolt tightening methods, but the torque method is widely used because it is simple and easy to use.

Technical information

Bolt strength

1) When bolt is subjected to tensile load

Pt = σt × As:: (1)
   = πd2 σt/4: (2)

 

Pt: Axial direction tensile load [N]
σb: Yield stress of bolts [N/mm2]
σt: Allowable stress of bolts [N/mm2]
      (σt = σb/safety factor α)
As: Effective sectional area of ​​bolts [mm2]
      As = πd2/4
d: Effective diameter of bolts (root diameter)[m]

 

(Example) Find the appropriate size for a single hex socket head cap screw to repeatedly (pulsating) receive a tensile load of P = 1,960 N {200 kgf}. (The hex socket head cap screw is made of EN 1.7220 Equiv., 38 to 43HRC, and has a strength class of 12.9.)

(1) From equation
As = Pt/σt = 1,960/219.6 = 8.9 [mm2]
∴It is recommended to find an effective sectional area larger than this from the "Bolt Fatigue Strength" table below and select M5 of 14.2 [mm2].
   In consideration of fatigue strength, select M6 with an allowable load of 2,087 N {213 kgf} from strength class 12.9 in the table.

 

2) When receiving tensile impact loads, such as stripper bolts, select based on fatigue strength. (Similarly, the stripper bolt that receives a load of 1,960 N {200 kgf} is made of EN 1.7220 Equiv., 33 to 38 HRC, and has a strength class of 10.9.)

 

According to the table "Fatigue Strength of Bolts" below, when the allowable load for strength class 10.9 is 1,960 N {200 kgf} or more, the M8 is 3,116 [N] {318 [kgf]}. Therefore, MSB10 with a shaft dia. of 10 mm with an M8 threaded section is selected. When the bolt is subjected to shear load, use a dowel pin in combination.

 

■ Unwin safety factor α based on tensile strength

MaterialStatic loadRepeated loadImpact load
PulsatingAlternating
Steel35812
Cast iron461015
Copper, soft metals55915

Allowable stress = standard strength / safety factor α
Standard strength: Yield stress for ductile materials (fracture stress for brittle materials)

 

The yield stress of strength class 12.9 is σb = 1,098 [N/mm2] {112 [kgf/mm2] }
Allowable stress σt = σb/safety factor (safety factor 5 from the above table "Unwin Safety Factor α Based on Tensile Strength")
                =1098/5
                = 219.6 [N/mm2] {22.4 [kgf/mm2] }

 

■Bolt fatigue strength (for screws >> fatigue strength of 2 million cycles)

Nominal of threadEffective sectional area
As
mm2		Strength class
12.910.9
Fatigue strength *12.910.910.9
N/mm2 {kgf/mm2}N {kgf}N/mm2 {kgf/mm2}N {kgf}
M48.78128 {13.1}1117 {114}89 {9.1}774 {79}
M514.2111 {11.3}1568 {160}76 {7.8}1088 {111}
M620.1104 {10.6}2087 {213}73 {7.4}1460 {149}
M836.687 {8.9}3195 {326}85 {8.7}3116 {318}
M105873 {7.4}4204 {429}72 {7.3}4145 {423}
M1284.366 {6.7}5537 {565}64 {6.5}5370 {548}
M1411560 {6.1}6880 {702}59 {6}6762 {690}
M1615757 {5.8}8928 {911}56 {5.7}8771 {895}
M2024551 {5.2}12485 {1274}50 {5.1}12250 {1250}
M2435346 {4.7}16258 {1659}46 {4.7}16258 {1659}

Fatigue strength* is extracted from "Estimated Fatigue Limits for Metric Threads for Machine Screws, Bolts, and Nuts" (Yamamoto) and revised.

Part Number 

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  1. 1
Part Number
PSSTH8-20
Part NumberStandard Unit PriceMinimum order quantityVolume DiscountDays to ShipRoHSTip Shape Stopper Shape Stopper Material (Color) Screw Material Screw Dia. (Coarse) M Length L Dimension
(mm)

MYR 33.02

1 Piece(s)Available 4 Day(s) or more 10Hex SocketStraightPolyacetal (White)SUS304820

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Please check the type/dimensions/specifications of the part PSSTH8-20 in the Stopper Bolts - Shoulder Type series.

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Specification/Dimensions

  • type

    • LUST
    • PSST
    • PSSTH
    • PUST
    • PUSTH
    • SSTS
    • SUSRT
    • SUSRTH
    • SUST
    • SUSTH
    • USRT
    • USRTH
    • UST
    • USTH
    • USTS

    Clear

  • Tip Shape

    • Hex Socket
    • Standard

    Clear

  • Stopper Shape

    • SR Shape
    • Straight

    Clear

  • Stopper Material (Color)

    • Low Repulsion Urethane (Gray)
    • Polyacetal (White)
    • Silicon (Light Gray)
    • Urethane (Black)

    Clear

  • Screw Material

    • SUS304
    • SCM435
    • SCM435 Equivalent

    Clear

  • Screw Dia. (Coarse) M

    • 3
    • 4
    • 5
    • 6
    • 8
    • 10
    • 12

    Clear

  • Length L Dimension(mm)

    • 15
    • 20
    • 25
    • 30
    • 35
    • 40
    • 45
    • 50
    • 60
    • 70

    Clear

  • CAD

    • 2D
    • 3D

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Days to Ship

    • All
    • 1 Day(s) or Less
    • 2 Day(s) or Less
    • 4 Day(s) or Less
    • 6 Day(s) or Less
    • 17 Day(s) or Less

    Clear

Specify Alterations

Products like this...

Part Number
LUST10-35
LUST10-40
LUST10-45
PSSTH8-25
PSSTH8-30
PSSTH8-35
Part NumberStandard Unit PriceMinimum order quantityVolume DiscountDays to ShipRoHSTip Shape Stopper Shape Stopper Material (Color) Screw Material Screw Dia. (Coarse) M Length L Dimension
(mm)

MYR 20.02

1 Piece(s)Available 17 Day(s) -StandardStraightLow Repulsion Urethane (Gray)SCM4351035

MYR 20.02

1 Piece(s)Available 17 Day(s) -StandardStraightLow Repulsion Urethane (Gray)SCM4351040

MYR 20.02

1 Piece(s)Available 4 Day(s) or more -StandardStraightLow Repulsion Urethane (Gray)SCM4351045

MYR 33.02

1 Piece(s)Available 17 Day(s) 10Hex SocketStraightPolyacetal (White)SUS304825

MYR 33.02

1 Piece(s)Available 4 Day(s) or more 10Hex SocketStraightPolyacetal (White)SUS304830

MYR 33.02

1 Piece(s)Available 6 Day(s) 10Hex SocketStraightPolyacetal (White)SUS304835

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