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No.000265 O-Ring Insertion Jig
Good IDEA!
29

Simple and accurate O-ring insertion

Related Category

O-Rings

O-Rings
Product name O-Rings/S Series
Part number NSA6
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria | Available sizes | Accuracy Info

Selection criteria

Effective centering tool used at insertion

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Available sizes

■O-Rings - S Series

Material Hardness
(JIS Hs) 		Color Operable
Temperature Range 		Usage
Nitrile Rubber 70±5 Black -30 ~ 100°C Mineral Oil Resistant
90±5 Black -25 ~ 100°C
Silicon Rubber 50±5 Milky White -50 ~ 200°C Heat Resistant
70±5 Navy
Fluororubber 70±5 Black -15 ~ 200°C
90±5 Black

■Sizes and Dimensions (excerpt)

JIS
Nominal Number 		Ring I.D. Ring
Wire Dia. 		Mating Side Dia.
Fixing Method
External Pressure Internal Pressure
3 Ø2.5 Ø1.5 Ø3 Ø5
4 Ø3.5 Ø4 Ø6
5 Ø4.5 Ø5 Ø7
6 Ø5.5 Ø6 Ø8
7 Ø6.5 Ø7 Ø9
8 Ø7.5 Ø8 Ø10
9 Ø8.5 Ø9 Ø11
10 Ø9.5 Ø10 Ø12
11.2 Ø10.7 Ø11.2 Ø13.2
12 Ø11.5 Ø12 Ø14
12.5 Ø12 Ø12.5 Ø14.5
14 Ø13.5 Ø14 Ø16
15 Ø14.5 Ø15 Ø17
16 Ø15.5 Ø16 Ø18
18 Ø17.5 Ø18 Ø20
20 Ø19.5 Ø20 Ø22
22 Ø21.5 Ø22 Ø24
22.4 Ø21.9 Ø2.0 Ø22.4 Ø25.4
24 Ø23.5 Ø24 Ø27
25 Ø24.5 Ø25 Ø28
26 Ø25.5 Ø26 Ø29
28 Ø27.5 Ø28 Ø31
29 Ø28.5 Ø29 Ø32
30 Ø29.5 Ø30 Ø33
31.5 Ø31 Ø31.5 Ø34.5
32 Ø31.5 Ø32 Ø35
34 Ø33.5 Ø34 Ø37
35 Ø34.5 Ø35 Ø38

* Please see the product pages for other diameter rings.

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Accuracy Info

■Accuracy of O-rings S Series

Ring Wire DIA. Tolerance:

Wire Dia. Tolerance
Ø1.5 ±0.1
Ø2.0

Parting Surface Burr Height: 0.1 or less

Parting Surface Burr Width: 0.15 or less

Ring I.D. Tolerance;

JIS
Nominal Number 		Ring I.D. Tolerance
Nitrile Silicone Fluorine
3 ~ 40 5 ~ Ø39.5 ±0.15 ±0.45 ±0.30
42 ~ 50 Ø41.5 ~ ±0.25 ±0.75 ±0.50

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IDEA NOTE Simplified positioning insertion jig

An O-ring is roughly inserted in the inner guide and then inserted in the assembly counterpart by slightly shrinking its outer shape with the outer guide.

(1) Roughly insert the workpiece (O-ring) in part 201 as a guide.

(2) Set the workpiece (O-ring) at the end of part 202.

(3) Fit part 203 onto the jig and set the jig in the insertion position.

(4) Press part 205 to insert the workpiece.

Tip enlarged view in (3)

Tip enlarged view in (4)

  • 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.

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

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  • * Unit assembly CAD data consists of some sub-assemblies.
       Each sub-assembly unit can be used as it is or can be edited.

Application Overview

Purpose

  • The device in this application example consists of the insertion jig body (right side of figure) and the stand (left side of figure).
  • O-ring setting
    With the outermost sleeve of the jig body removed, set up the jig body in an opposite orientation to that shown in the figure on the left in the stand. The pin in the center has a dual structure. Set the workpiece (O-ring) on the inner pin and fit the removed outer sleeve back on.
  • Insertion positioning
    Orient the center pin fit with the O-ring downward (state shown in the figure on the left) and butt the jig against the insertion position of the assembly counterpart (green). Also butt the end of the outer sleeve against the assembly counterpart.
  • Insertion of O-ring
    When the cylindrical part shown at the center in the figure on the left is pressed with the hand, the outer part of the dual structure pin at the center slides and pushes the O-ring out. In the jig, a cylindrical nut is located below the cylindrical part and the push stroke is adjusted according to the nut position. When the hand is released, the cylindrical part at the center returns to the original position due to the reaction force of the compression spring that is installed between the pin parts in the dual structure.

Points for use

  • Manual Operation
    Applied to a portion where it is not possible to accurately incorporate an O-ring using your hands.

Target workpiece

  • Shape: O-ring (rubber)
  • Size: inner diameter Ø3 x t0.5mm

Design Specifications

Operating Conditions or Design Requirements

  • Insertion stroke: 7mm
  • Outer dimensions: Ø20 x H42mm

Required Performance

  • Positioning accuracy: ±0.2mm
  • Assumed load: 0.75N

Selection Criteria for Main Components

  • The O-ring insertion guide is made of MC nylon.
  • The insertion pin is made of EN 1.4301 Equiv. and precisely finished.

Design Evaluation

Verification of main components

  • Confirmation of load of used spring
    • Weight of parts to be returned: M = 14g
      Friction coefficient between O-ring and pusher pin: f1 = 40g
      Friction coefficient between inner guide and pusher pin: f2 = 10g
      Required spring load: F
      = M + f1 + f2
      = 14 + 40 + 10
      = 65g
      Spring constant: K = 10g/mm
      Free length: 20mm
      Set length: 8.2mm
      Spring set load: P = 10 x (20 - 8.2)
      = 10 x 11.8
      ≒120g
      Therefore, P > F.

Other Design Consideration

  • The dimensions of the jig part are determined by knowing the accuracy of the product using the O-ring.
  • Friction is reduced at the O-ring insertion guide.

Explore Similar Application Examples

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Part List

No. Part Name Sample picture MISUMI Part Number
For Price and Days to ship click on Part No. 		Quantity
1 Compression Springs WY3-15 1
2 O Ring NSA6 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

    CAD Data Download (Unit Assembly)

    CAD Data Download: File Format
    生成

    Thank you for downloading the data.

    Click the Good IDEA! button when this application example is helpful.


    This data is utilized in order to list more useful application examples in the future.

    Good IDEA!

    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.

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

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