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Blind Hole Wire Thread Insert: A Specialized Solution for Blind Hole Threaded Connections
Wire thread insert
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Blind Hole Wire Thread Insert: A Specialized Solution for Blind Hole Threaded Connections

A blind hole wire thread insert is a special threaded fastener designed for blind holes (closed-end holes). It is made by winding high-strength alloy steel wire (such as stainless steel 304/316 or titanium alloy) and features a tapered guiding structure at the front end. This design allows it to adapt to threaded connection needs in enclosed spaces, while also enhancing threads, repairing defects, and improving reliability.

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    product details

    Core Design and Characteristics

    Structural Features
    ◦ Tapered Front End: Guides the insert to be smoothly implanted into the bottom of the blind hole, avoiding installation obstacles caused by closed spaces and ensuring the entire length of the thread can effectively bear force.
    ◦ Helical Body: Precision winding technology forms internal threads that match the original threaded hole, while the external threads tightly engage with the inner wall of the blind hole to disperse stress.
    ◦ Material Selection: The main materials include stainless steel (suitable for general scenarios), titanium alloy (lightweight and high-temperature resistant, used in aerospace), and 316 stainless steel (resistant to strong corrosion, ideal for chemical environments).

    Key Differences from Ordinary Wire Thread Inserts

    Comparison Item

    Blind Hole Wire Thread Insert

    Ordinary Wire Thread Insert

    Application Scenario

    Blind holes (closed bottom)

    Through holes (penetrating holes)

    Front-End Design

    Tapered guide for easy positioning

    Straight without guide, relying on through-hole space for installation

    Thread Effectiveness

    Full-length threads bear force, including the bottom of the blind hole

    Only part of the threads actually bear force in through holes

    Installation Difficulty

    No additional positioning tools needed, success rate >95%

    Prone to  in blind holes, success rate <70% 
    24071201-详情图1

    Blind hole wire thread insert parameters Parameters

    Product name

    Blind hole wire thread insertt

    Material

    SUS304/SUS316/SUS321/InX750/Brass/Customized

    Surface color

    None / Eco-friendly plating

    Surface coating

    Silver/tin/cadmium/zinc/other

    Thread type

    Metric

    Common type

    M3-M39

    Lock type

    M3-M12
    24071201-详情图2

    Common blind hole wire thread insert parameters

    (mm)

    P

    d1 min

    d1 max

    d2 min

    d2 max

    M3

    0.5

    3.8

    4.35

    3.11

    3.22

    M4

    0.7

    5.05

    5.6

    4.15

    4.29

    M5

    0.8

    6.25

    6.8

    5.17

    5.33

    M6

    1

    7.58

    7.95

    6.22

    6.41

    M7

    1

    8.58

    9.2

    7.22

    741

    M8

    1.25

    9.85

    10.35

    8.27

    8.48

    M10

    1.5

    12.1

    12.8

    10.32

    10.56

    M12

    1.75

    14.5

    15

    12.38

    12.65

    M14

    2

    16.87

    17.87

    14.43

    14.73

    M16

    2

    18.87

    19.9

    16.43

    16.73

    M18

    2.5

    21.4

    22

    18.54

    18.9

    M20

    2.5

    23.46

    24.4

    20.54

    20.9

    M22

    2.5

    25.61

    26.9

    22.54

    22.9

    M24

    3

    28.15

    29.1

    24.65

    25.05

    M27

    3

    31.15

    32.4

    27.65

    28.05

    M30

    3.5

    34.7

    35.81

    30.76

    31.21

    M33

    3.5

    37.7

    39.01

    33.76

    34.21

    M36

    4

    41.33

    42.67

    36.87

    37.35

    M39

    4

    44.33

    45.75

    39.87

    40.35

    Lock type blind hole wire thread insert parameters

    (mm)

    P

    d1 min

    d1 max

    d2 min

    d2 max

    M3

    0.5

    3.8

    4.35

    3.11

    3.22

    M4

    0.7

    5.05

    5.6

    4.15

    4.29

    M5

    0.8

    6.25

    6.8

    5.17

    5.33

    M6

    1

    7.58

    7.95

    6.22

    6.41

    M7

    1

    8.58

    9.2

    7.22

    7.41

    M8

    1.25

    9.85

    10.35

    8.27

    8.48

    M10

    1.5

    12.1

    12.8

    10.32

    10.56

    M12

    1.75

    14.5

    15

    12.38

    12.65

    Typical Application Fields

    • Mechanical Manufacturing: Fixing blind holes in equipment bases and bearing blocks;
    • Automotive Industry: Blind hole interfaces in engine blocks and transmission cases;
    • Aerospace: Lightweight connections in spacecraft brackets and precision instruments;
    • Chemical Equipment: Corrosion-resistant threaded connections in reaction kettles and pipeline accessories;
    • Maintenance Scenarios: Quickly repairing blind hole thread damage in old equipment.

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