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  • > No.000181 Measures for the thrust load of a small-size motor shaft
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No.000181 Measures for the thrust load of a small-size motor shaft

Reducing the thrust load without using a coupling

Related Category

Thrust Needle Roller Bearings

Product name Thrust Needle Roller Bearings
Part number BA0619
* Orange colored cells in the table below indicate the part numbers used in this example.

Selection criteria

Suitable item to support thrust load

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Available sizes

■Thrust Needle Roller Bearings

Material: JIS-SUJ (Bearing Steel)

(Name No.) Thrust Needle Roller with Retainer Thrust Washer x 2
Hole Dia. O.D. Overall Thickness Hole Dia. O.D. Plate Thickness
Tolerance Tolerance Tolerance Tolerance Tolerance Tolerance
BA0414 Ø4 +0.14 /
+0.02
Ø14 -0.095 /
-0.365
2 0 / -0.01 Ø4 +0.2 /
+0.02
Ø14 -0.032 /
-0.302
1 +0.05 /
-0.05
BA0515 Ø5 Ø15 Ø5 Ø15
BA0619 Ø6 Ø19 -0.110 /
-0.440
Ø6 Ø19 -0.040 /
-0.370
BA0821 Ø8 +0.175 /
+0.025
Ø21 Ø8 +0.245 /
+0.025
Ø21
BA1024 Ø10 Ø24 Ø10 Ø24
BA1226 Ø12 +0.212 /
+0.032
Ø26 Ø12 +0.302 /
+0.032
Ø26
BA1528 Ø15 Ø28 Ø15 Ø28
BA1730 Ø17 Ø30 Ø17 Ø30
BA2035 Ø20 +0.25/
+0.004
Ø35 -0.120 /
-0.510
Ø20 +0.37 /
+0.04
Ø35 -0.050 /
-0.440
BA2542 Ø25 Ø42 -0.130 /
-0.520
Ø25 Ø42
BA3047 Ø30 Ø47 Ø30 Ø47

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Performance info.

■Load Information of Thrust Needle Roller Bearings

(Name No.) Hole Dia. O.D. Allowable Rotation Speed
(rpm)
(Reference)
Mass
(g)
(Reference)
Basic Dynamic
Load Rating
Ca kN
Basic Static
Load Rating
Coa kN
BA0414 Ø4 Ø14 5200 2.7 4.4 8
BA0515 Ø5 Ø15 5200 2.8 4.75 9.2
BA0619 Ø6 Ø19 4700 5 6.8 15.5
BA0821 Ø8 Ø21 4500 6 7.8 19.4
BA1024 Ø10 Ø24 4200 9 9.2 25.5
BA1226 Ø12 Ø26 3700 9.9 29
BA1528 Ø15 Ø28 3200 10 11.3 36
BA1730 Ø17 Ø30 3000 12 11.9 39.5
BA2035 Ø20 Ø35 2500 15 13.1 46.5
BA2542 Ø25 Ø42 2100 21 14.7 58
BA3047 Ø30 Ø47 1800 24 16.3 70

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Bearing Lock Nuts

Product name Bearing Lock Nuts/Square Type/Coarse Thread
Part number BNGS6
* Orange colored cells in the table below indicate the part numbers used in this example.

Selection criteria

Compact nut designed exclusively for tightening the bearings

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Available sizes

■Bearing Lock Nuts - Square

Screw Pitch Type Material Hardness Surface Treatment Accessory
Coarse

Fine
EN 1.0038 Equiv. - Black Oxide Set Piece
(Copper Alloy)
Set Screw (EN 1.7220 Equiv.)
EN 1.1191 Equiv. Thermal Refined 22 ~ 28HRC
EN 1.4301 Equiv. - - Set Screw (EN 1.4301 Equiv. )

■Sizes and Dimensions

Thread Dia. x Pitch Retainer
O.D.
External
Size
Overall thickness Set Screw
Dia.
Coarse Thread Fine Thread
M3 x 0.5 M3 x 0.35 Ø4 □10 5.5 M3
M4 x 0.7 M4 x 0.5 Ø5
M5 x 0.8 M5 x 0.5 Ø9 □11
M6 x 1.0 M6 x 0.75 Ø10 □12
M8 x 1.25 M8 x 1.0 Ø13 □14 6.5
M10 x 1.5 M10 x 1.0 Ø16 □17 8 M4
M12 x 1.75 M12 x 1.0 Ø17 □19
- M15 x 1.0 Ø21 □22 10
M16 x 2.0 -
- M17 x 1.0
M20 x 2.5 M20 x 1.0 Ø26 □30 13
M24 x 3.0 - Ø33 □35 15 M5
- M25 x 1.5
M30 x 3.5 M30 x 1.5 Ø39 □40 20 M6
- M35 x 1.5 Ø43 □45
M40 x 1.5 Ø48 □49 25
M50 x 1.5 Ø61 □63

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Gussets

Product name Gussets/Tapped Holes/Standard Holes Position/Standard Perpendicularity Type
Part number RBBW30-30-6
* Orange colored cells in the table below indicate the part numbers used in this example.

Selection criteria

Best suited for using as an economical reinforcing rib

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Available sizes

■Rib - Tapped Hole Fixed Dimensions

Precision Type Material Surface Treatment
Standard Grade
(perpendicularity: 0.05 / 100)

Precision Grade
(perpendicularity: 0.02 / 100)
EN 1.0038 Equiv. -
Black Oxide
Electroless Nickel Plating
EN AW-5052 Equiv. -
Clear Anodize
Black Anodize
EN 1.4301 Equiv. -

■Sizes and Dimensions

Precision Type Short side Long side Thickness / Tapped Hole Dia. Tapped
Hole Depth
30 40 50 60 80 100 EN 1.0038 Equiv. / EN 1.4301 Equiv. EN AW-5052 Equiv.
t6 t9 t12 t16 t6 t10 t12 t16
Standard Grade
(perpendicularity:
0.05 / 100)

Precision Grade
(perpendicularity:
0.02 / 100)
20 M3 M3 Diameter x 1.5
30 M3 M6 M3 M6
M5 M6 M5 M6
40 M5 M6 M5 M6
M6 M8 M6 M8
50 M5 M6 M5 M6
M6 M8 M6 M8
60 M5 M6 M5 M6
M6 M8 M6 M8
80 M5 M6 M8 M5 M6 M8
M6 M8 M6 M8
100 M5 M6 M8 M5 M6 M8
M6 M8 M6 M8

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IDEA NOTE Length in the motor shaft direction needs to be reduced.

By using the thrust bearing, the shaft is made capable to withstand the thrust load without coupling.

IDEA NOTE Use of a low thrust motor

By using the thrust bearing, load to the motor is reduced.

  • Terms of use of CAD data and simplified drawing data
    These terms and conditions (hereinafter referred to as “the Terms") set forth the conditions for downloading CAD data and simplified drawing data provided by MISUMI Corporation (hereinafter referred to as "MISUMI") via www.misumi-europe.com operated by MISUMI Europa GmbH(hereinafter referred to as the "Website"). By downloading CAD data and simplified drawing data posted on the Website (hereafter referred to as “Data”), customers are deemed to have agreed to these Terms.

    1. Purpose of Use
    MISUMI offers the following:
    1)CAD data found on the Website (3D CAD data, 3D Intermediate data and 2D CAD data) for the purpose of informing customers of the characteristics of the products offered by MISUMI or a manufacturer affiliated with MISUMI for use in their designs.
    2)Simplified drawing data (in PDF format) for the purpose of checking the specifications of products.
    2. Characteristics of Data
    There may be a discrepancy in certain characteristics of products (for example: tolerance, surface roughness, chamfer, etc.) between the Data and the actual product. Furthermore, for the purpose of reducing the file size of the Data, some information such as oil groove shapes, threads, or spring shapes, may be removed from the Data.
    3. Disclaimer
    MISUMI carefully creates the Data but makes no warranty as to the quality, accuracy, functionality, safety, reliability, etc., of the Data. MISUMI may at any time, and with no prior notice to customers, revise or delete Data. MISUMI assumes no responsibility for any damage or loss resulting from any revision or deletion of the Data, or any errors in said data. Customers are solely responsible for all aspects of their own designs, including those made using the Data. MISUMI may provide customers with design example data on the Website, but the quality, accuracy, functionality, safety, reliability, etc., of such data are not guaranteed. MISUMI may, at any time, and in its sole discretion, request that the customer cease its use of or destroy the Data in its possession. MISUMI may request the customer provide MISUMI documentation of such destruction.
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    Customers or users of the Data, are prohibited from the following acts regarding the Data, in whole or in part:
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    Revised: September 21, 2025

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Application Overview

Purpose

  • Purpose
    • Reducing the thrust load to the motor shaft without using coupling.
  • Operation
    • Worm gear and wheel are rotated by the motor, and the drum on the shaft wind the wire.

Points for use

  • Applicable to thrust load from one direction only.

Target workpiece

  • Shape: Block
  • Size: W40 x D40 x H25mm
  • Weight: 0.3kg

Design Specifications

Operating Conditions or Design Requirements

  • Up and down stroke: 30mm
  • External size: W123 x D125 x H92mm

Required Performance

  • Load: 3N

Selection Criteria for Main Components

  • A motor with thrust load of 0.8N is selected to pull up a workpiece of 0.3kg.

Design Evaluation

Verification of main components

  • Select the bearing to withstand the load weight.
  • Thrust bearing selection
    • Conditional values: Diameter of the wire winding part of the drum d1 = 28mm, pitch circle diameter of the worm wheel d2 = 30mm, motor rotational speed z1 = 1200rpm, workpiece mass W = 0.3kg, gravitational acceleration g = 9.8m/s², work movement length l1 = 30mm, friction coefficient on the tooth surface µ = 0.0167, tooth rectangular pressure angle a = 20°, worm gear advance angle y1 = 3.58°, pitch circle diameter of worm gear d3 = 16mm, worm gear rotational speed q1 = 1200mm, basic load rating of thrust bearing c1 = 6.8kN
    • Number of revolution necessary for the drum to wind the workpiece n1 is given as follows:
      n1 = d1 x π / l1 = 28 x π / 30 = 2.93
      Motor rotation time at that time is given by
      t1 = d2 x n1 x (60 x z1) = 30 x 2.93 x (60 x 1200) = 4.40t
    • Net power H1 applied to the worm gear is given by
      H1 = W x g x l1 / t1 = 0.3 x 9.8 x 30 / 4.40 = 0.02N = 2.72 x 10-5 PS
    • Apparent friction angle on the tooth surface p1 is given by
      p1 = tan - 1 (µ) = tan - 1 (0.0167) = 0.957°
    • Axial thrust load F1 of the worm gear is given by
      F1 = F2 / tan (y + p) = 1.432 x H1 x 106 / {tan (y1 + p1) x d3 x q1} x g
      = 1.432 x 2.72 x 10-5 x 106 / {tan (3.58 + 0.957) x 16 x 1200} x 9.8
      = 0.25N < 6.8kN = c1
      ⇒No problem

Other Design Consideration

  • The bearing, instead of bush, is used although operation turns into low speed rotation because of the worm gear and wheel drive.
  • Mounting should be conducted so that no gap exists between the motor bracket, bearing, and the worm gear.

Explore Similar Application Examples

Page - / -

Part List

No. Part Name Sample picture MISUMI Part Number
For Price and Days to ship click on Part No.
Quantity
1 Needle Bearing BA0619 1
2 Rotary Shaft SSFRHMS8-82.0-F15.0-B8-P6-T15.0-S8-Q6-SC42 1
3 Bearing Lock Nuts BNGS6 2
4 Ball Bearing B636ZZ 2
5 Ribs RBBW30-30-6 2
6 Hex Socket Set Screws MSSU4-5 1
7 Set Screws Dimple MSSU5-6 1
  • The part list above contains only MISUMI parts.
    The list of parts and machined products of other manufacturers than MISUMI can also be downloaded by part list download (CSV).
  • Terms of use of CAD data and simplified drawing data
    These terms and conditions (hereinafter referred to as “the Terms") set forth the conditions for downloading CAD data and simplified drawing data provided by MISUMI Corporation (hereinafter referred to as "MISUMI") via www.misumi-europe.com operated by MISUMI Europa GmbH(hereinafter referred to as the "Website"). By downloading CAD data and simplified drawing data posted on the Website (hereafter referred to as “Data”), customers are deemed to have agreed to these Terms.

    1. Purpose of Use
    MISUMI offers the following:
    1)CAD data found on the Website (3D CAD data, 3D Intermediate data and 2D CAD data) for the purpose of informing customers of the characteristics of the products offered by MISUMI or a manufacturer affiliated with MISUMI for use in their designs.
    2)Simplified drawing data (in PDF format) for the purpose of checking the specifications of products.
    2. Characteristics of Data
    There may be a discrepancy in certain characteristics of products (for example: tolerance, surface roughness, chamfer, etc.) between the Data and the actual product. Furthermore, for the purpose of reducing the file size of the Data, some information such as oil groove shapes, threads, or spring shapes, may be removed from the Data.
    3. Disclaimer
    MISUMI carefully creates the Data but makes no warranty as to the quality, accuracy, functionality, safety, reliability, etc., of the Data. MISUMI may at any time, and with no prior notice to customers, revise or delete Data. MISUMI assumes no responsibility for any damage or loss resulting from any revision or deletion of the Data, or any errors in said data. Customers are solely responsible for all aspects of their own designs, including those made using the Data. MISUMI may provide customers with design example data on the Website, but the quality, accuracy, functionality, safety, reliability, etc., of such data are not guaranteed. MISUMI may, at any time, and in its sole discretion, request that the customer cease its use of or destroy the Data in its possession. MISUMI may request the customer provide MISUMI documentation of such destruction.
    4.Prohibited Acts
    Customers or users of the Data, are prohibited from the following acts regarding the Data, in whole or in part:
    (1)Requesting quotations or placing orders for products with third parties other than those authorized by MISUMI or its affiliates;
    (2)Receiving quotations or orders for products from third parties by providing the Data to a third party or using the Data in their own business;
    (3)Displaying links to the Website related to the Data on their own websites, etc., without consent of MISUMI or its affiliates;
    (4)Using or reproducing the Data beyond the scope of the above-stated Purpose of Use;
    (5)Modifying, altering, tampering with, translating, or adapting the Data;
    (6)Selling, transferring, lending, sublicensing, or providing the Data to third parties in any way without consent of MISUMI or its affiliates;
    (7)Altering the content, reverse engineering, decompiling, disassembling, or analyzing the Data;
    (8)Publicly disclosing or exhibiting the Data without consent of MISUMI or its affiliates;
    (9)Using the Data for the purpose of providing products and services identical or similar to those of MISUMI or its affiliates;
    (10)Performing acts that interfere with the proper functioning of this Website, such as acquiring Data in bulk.
    5. Copyright
    All title and copyright in and to any information contained in the Data are owned by MISUMI or the relevant manufacturer affiliated with MISUMI and are protected by applicable copyright laws and international treaties. By downloading Data, the customer acquires no ownership rights of any kind in the intellectual property contained within. Without prior approval from MISUMI, no part of the Data may be utilized (reproduced, modified, reverse-engineered, uploaded, presented, sent, distributed, licensed, sold, or published) for any purpose other than that mentioned above.
    In the event Data is found to have been to be used for any purpose other than that mentioned above or against any applicable laws or the Terms, MISUMI may pursue any legal remedy available to it, which may result in forbidding the offending user from using the Data or accessing the Website.
    6. Third-Party Data
    MISUMI offers some Data provided by third parties. Such Data may be subject to separate terms and conditions, in addition to these terms. MISUMI makes no guarantee or warranty regarding Data from third parties.
    7. Export Control
    Customers shall comply with all applicable laws and regulations regarding the export of the Data.
    8. Amendments to the Terms
    MISUMI may, at any time, and in its sole discretion, modify these terms and conditions; any such modification will be effective immediately.
    9. Severability
    If any term or provision of these Terms is invalid, illegal, or unenforceable in any jurisdiction, such invalidity, illegality, or unenforceability shall not affect any other term or provision of these Terms or invalidate or render unenforceable such term or provision in any other jurisdiction. Section 139 BGB (German Civil Code) shall not apply.
    10.Miscellaneous
    In the event that Customers violate the Terms, MISUMI and/or MISUMI Europa GmbH shall be entitled to claim the damages and expenses (including attorney's fees) incurred by such violation against the Customers.
    These Terms and any disputes arising in connection therewith shall be exclusively governed by and construed in accordance with the laws of the Federal Republic of Germany, without regard to its conflicts of law principles. The courts located in Frankfurt am Main/Germany shall have exclusive jurisdiction to adjudicate any dispute arising in connection with these Terms. By downloading the Data, you agree to submit to the exclusive and personal jurisdiction of the courts located in Frankfurt am Main/Germany.

    Revised: September 21, 2025

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    Cautions on the CAD data

    1. Assembly data shows the assembly drawings in the concept design phase. The sole purpose of the data is to explain the structure and functionality of the assembly and is not considered nor to be used as a final design.
      You will need to edit the Data so that it meets your specific design conditions.
    2. The CAD data unit assembly consists of sub-assemblies.
      Each sub-assembly unit can be used as it is or can be edited.
    3. * The part in the frame is a sub-assembly unit.

    4. The Data for fabricated parts is based on easy-to-edit dimensions and shapes in sketches and histories.
    5. The Data including the third-part components are made by the Company.

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