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    產品展示

    產品詳情


    Types of Inserts

    There are two styles of Heli-Coil inserts.

    The standard or FREE RUNNING insert

    which provides a smooth free-running

    thread; and SCREW-LOCKING which

    provides self-locking torque on the male

    member by a series of “chords” on one

    or more of the insert coils. They are both

    available in Tanged and Tangless; Inch and

    Metric series.

    Heli-Coil inserts are precision formed coils of

    extremely hard, diamond shaped 304 stainless steel.

    When installed into an STI tapped hole, they provide

    permanent conventional 60° internal screw threads.

    This assembled insert accommodates any standard bolt

    or screw as per MIL-S-7742 and AS8879 (UNJ controlled

    root radius). Inserts can be custom made in all materials

    listed on p. 9.

    Tanged Size Range:

    ? UNC #1 through 1-1/2 ? UNF #2 through 1-1/2

    ? Metric Coarse M2 through M39 ? Metric Fine M8 through M39

    Inserts are also available in UNEF, UNS, 8UN, 12UN, 16UN, Spark Plug and Pipe Thread.

    Types of Inserts

    There are two styles of Heli-Coil inserts.

    The standard or FREE RUNNING insert

    which provides a smooth free-running

    thread; and SCREW-LOCKING which

    provides self-locking torque on the male

    member by a series of “chords” on one

    or more of the insert coils. They are both

    available in Tanged and Tangless; Inch and

    Metric series.

    (Note: Inch series Screw-Locking inserts are dyed red for identification.)

    Illustration of the Retention Principle

    Free Running Insert Screw-Locking Insert

    Heli-Coil tanged inserts are larger in diameter

    before installation than the tapped hole. During installation,

    the inserting tool applies torque to the tang reducing

    the diameter of the leading coil permitting it to enter

    the tapped thread. After installation, each high tensile

    coil of the insert expands outward with a spring-like

    action permanently anchoring the insert.

    Tangless inserts eliminate the need for tang break-off and retrieval. Since no

    loose tangs are left behind, they become the solution when Foreign Object Debris (FOD)

    cannot be present in critical applications. Loose tangs can potentially cause damage and

    result in the need for costly repairs.

    Tangless inserts are manufactured using the same materials as standard inserts and

    provide the same superior performance characteristics. They are available in Free

    Running and Screw-Locking and in inch and metric series, coarse and fine.

    Heli-Coil inserts provide a positive means for protecting and strengthening

    tapped threads in any material. The unique design features of the insert offer

    many benefits.

    Stronger Assemblies

    Tapped threads are strengthened because the inherent flexibility of the insert provides

    a more balanced distribution of dynamic and static loads throughout the length of thread

    engagement. This flexibility also compensates for variation in lead and angle error allowing

    each coil to carry its share of the load.

    No Thread Wear

    Thread life is dramatically increased even after repeated assembly and disassembly

    because the insert hardness and surface finish practically eliminate erosion of the

    thread form due to frictional wear.

    Corrosion Resistance

    Under normal environmental conditions, Heli-Coil inserts minimize galvanic action within

    the threaded assembly because of their superior corrosion resistance.

    Design Flexibility

    Bolt tensile strength can be balanced against parent material shear strength, assuring

    bolt failure rather than parent material damage. Five insert lengths are available in each

    thread size.

    Eliminate Stress

    Virtually no stress is introduced into the parent material because there is no staking,

    locking, swaging or keying in place – the outward spring-like action of the insert

    holds it in place.

    Minimize Space & Weight

    Heli-Coil inserts allow the use of smaller bosses and flanges than any other insert.

    Heli-Coil inserts can generally be incorporated into existing designs, where no other

    provision has been made for an insert, without increasing boss size.

    Minimize Total Cost

    Cost savings abound. Lower insert cost, lower installation cost and Heli-Coil inserts provide

    design flexibility by allowing a wide choice of parent materials while maintaining maximum

    threaded assembly strength.

    True Clamping Torque

    Maximum clamping action and bolt tension are assured with minimum wrench torque

    because of the mirror-smooth surface finish of Heli-Coil inserts.

    Wide Temperature Range

    Heli-Coil stainless steel inserts can be used in temperatures ranging from -320°F to +800°F.

    Quality & Reliability

    Stringent Quality Assurance and Engineering Standards are rigidly enforced in all phases

    of the manufacturing process. This assures integrity of your product design.

    High Volume Production

    Heli-Coil inserts are available mounted

    on plastic strips and wound onto reels

    (500 or 1000 inserts per reel). With power

    installation tooling, use of strip feed inserts

    will substantially increase installation rates

    by minimizing handling.

    Universal Acceptance

    Heli-Coil Standard and Screw-Locking Inserts

    are the original – and have an extensive

    background of tension, torque, shear,

    vibration and fatigue tests conducted by

    American industry’s leading companies

    as well as the U.S. Military. Successful

    applications in the fields of aviation,

    electronics, industrial, automotive and

    military equipment provide a wealth

    of experience and confidence in the

    performance and reliability of Heli-Coil

    inserts.

    Custom Design Services

    In addition to the benefits listed above,

    Heli-Coil provides a wide range of support

    to solve fastening problems. This design

    catalog is one of them. The following pages

    are presented in a manner to make it easy

    to “design-in” Heli-Coil inserts to take

    advantage of the extraordinary benefits

    they provide.

    Additionally, our Sales Engineers,

    Applications Engineers and Design

    Engineers are available for consultation

    for specific designs. When the product gets

    to the manufacturing phase, our extensive

    experience in production tooling and

    installation techniques ensures that you

    can indeed make your product better

    with Heli-Coil inserts.

    Screw-Locking Inserts

    ? A resilient locking mechanism that grips the bolt and prevents it from

    loosening under vibration or impact.

    ? Repeated assembly and disassembly without appreciable loss

    of positive self-locking torque.

    ? Savings in space, weight and money, through the elimination

    of lock wiring, lock nuts, lock washers, chemical compounds,

    plastic pellets/patches and/or other locking mechanisms.

    ? Inch inserts dyed red for easy identifi cation.

    ? Meets NASM8846, MA1565, NASM21209, MA3329,

    MA3330, MA3331.

    Hi-Torque Inserts

    ? Similar to Screw-Locking but with higher prevailing torque which compensates

    for reduced friction in highly lubricated applications.

    ? Ideal for higher vibration applications.

    ? Approximate 40% increase in prevailing torque levels.

    ? Available in #10 through 3/8" UNF only.

    ? Meets AS1394, AS3094, AS3095, AS3096, AS3097.

    Stud-Lock Inserts

    ? Highest prevailing torque insert available.

    ? Enables use of threaded rod for space-saving stud applications.

    ? Allows for any class fi t of threaded rod.

    ? Eliminates inconsistencies caused by interference-fi t studs.

    ? Available for both straight and step studs, #10 through 1/2" UNC and UNF.

    ? Meets AS1229, AS3080, AS3081, AS3082, AS3083.

    ? RoHS compliant; contains no chromates

    ? Eliminates need for zinc primers and messy epoxies

    ? Provides uniform top to bottom coverage

    ? Provides enhanced visibility in the assembly

    Primer-Free? II ? Prevents galvanic corrosion between insert and parent material

    ? Eliminates locking torque issues associated with primers

    ? Eliminates clogging/fouling of installation tools

    ? Improves installation productivity

    ? Provides additional lubrication facilitating insert installation

    Material Spec: None

    Color: Matte black

    ? Provides additional lubrication in high friction applications

    ? High temperature resistance (400°F)

    Dry Film Lubricant ? Highly recommended with Heli-Coil Screw-Locking inserts

    ? Mildly corrosion resist

    Heli-Coil offers maximum design fl exibility while adhering to conservative engineering practice

    allowing use of Heli-Coil inserts in virtually any application or material. Five lengths of inserts

    are available. In this design manual, the lengths are listed as multiples of the nominal thread

    diameter of the screw; 1, 1-?, 2, 2-?, and 3. This choice of insert length balances the bolt

    tensile strength against the shear strength of the parent material. This allows for the design of

    assemblies where the bolt will fail before the parent material. Tables III and IV below show the

    length of insert to be used with different combinations of bolts and parent materials.

    The effect of corrosion on threaded

    assemblies is dependent on many factors -

    environment, types of metals used, sealing

    mechanisms and length of service. The

    following recommendations apply for

    minimizing the effects of corrosion on

    Heli-Coil stainless steel insert assemblies

    at operating temperatures less than 800°F,

    using carbon steel or alloy steel bolts.

    The following defi nitions apply…

    Normal Service. Natural atmosphere

    environment with the screw always assembled

    in the insert.

    Severe Service. Mildly contaminated

    atmospheric conditions involving moisture,

    occasional exposure to salty air or sea spray

    and the screw may be left out of the insert for

    extended periods of time.

    Extremely Severe Service. Assembly is

    exposed to salt water, corrosive atmosphere

    and/or the screw is out of the assembly

    frequently allowing a blind hole to trap water.

    Tangless threaded inserts provide many advantages over

    Tanged inserts.

    They eliminate the need for tang break off and tang retrieval

    and allow for non-destructive insert removal. Tangless inserts

    are easily adjusted and easily removed after installation.

    Inch and metric size inserts are available in stainless steel and

    gall resistant (or Nitronic 60) materials. Finish options include

    Primer Free? II, Dry Film Lube (and Cadmium when required by Mil Spec.)

    Standard boss configurations may be used with Heli-Coil inserts.

    A boss diameter of twice the nominal bolt size is adequate for most

    load conditions. For critical applications, the boss diameter should be

    twice the Heli-Coil tap major diameter (Tables VII & VIII, p. 20-21).

    Boss thickness is a function of the size and length of the insert chosen

    and the particular requirements of the component being designed.

    The use of Heli-Coil inserts generally minimizes the size of the boss

    because their high strength characteristics allow for smaller or fewer

    fasteners.

    Class of Fit

    Since Heli-Coil inserts are flexible, the class of fit of the final

    assembly is a function of the tapped hole. Heli-Coil STI (Screw

    Thread Insert) taps are available in inch series for both Class 2B and

    3B. Metric Classes include 5H and 4H5H. Class 2B or 5H tapped

    holes provide widest production tolerances while Class 3B or 4H5H

    holes provide slightly tighter tolerances.

    Class 3B or 4H5H holes are recommended for Screw-Locking

    applications.

    Standard bolts and screws that need no special

    hardware are used with Heli-Coil inserts. The bolt

    must engage the entire insert to insure maximum

    assembly strength. It is strongly recommended that the

    tang always be removed and bolt projection be equal

    to the full tapped thread depth (Dimension C,

    Tables VII & VIII, p. 20-21). If design limitations

    prohibit this, contact us to obtain minimum bolt

    projection data.

    The suggested drill sizes listed for aluminum in Tables V & VI,

    p. 18-19, are within the minor diameter limits specified in

    NASM33537 or MA1567. Drill sizes listed for steel, magnesium

    and plastic are larger (in most cases) allowing for parent material

    “close-in” in soft materials and increased tap wear life in hard

    materials.

    The drill depths listed in this table allow for tap end clearance,

    maximum insert “set-down”, countersink, and the chamfer on the

    tap. These drill depths are minimum and should be increased where

    possible, especially when using Spiral Pointed Taps, to allow for chip

    clearance. The formula for the drill depth is given on p.18-19.

    2. Countersinking

    Countersinking the drilled hole is recommended to prevent a feather

    edge at the top of the tapped hole and to help guide the insert into

    the tapped threads. A 120° included angle countersink is necessary

    to insure that the angle of the tapped thread and the countersink

    are the same (120° ÷ 2 = 60° tapped thread).

    3. Tapping

    The dimensions for the depth of the full tapped thread (Dimension C,

    Tables VII & VIII, p.20-21) are MINIMUM for blind holes with countersinks.

    For through holes without a countersink the minimum full

    tapped thread depth must be equal to the insert nominal length

    (Dimension Q, p.12-13).

    Is the tapped hole correct?

    Accuracy of the finished thread when the insert is installed

    is dependent upon the accuracy of the tapped hole. If the

    finished tapped hole gages satisfactorily, the installed insert

    will be within the thread tolerance.

    It is not necessary to gage the installed insert.

    After the insert is installed, the GO thread plug gage may

    not enter freely; however, the insert will always seat itself

    when the bolt or screw is installed and tightened. (Reference

    NASM33537).

    Gage handles and all gage nibs are marked with the

    extreme product limits for the particular size and class of fit.

    (See p. 20-21, Tables VII & VIII, Pitch Diameter Limits.)

    When gaging tapped holes which have been thoroughly

    cleaned or which have a protective finish applied, the

    gage should always be lubricated with light oil.

    HI nib may enter provided a definite drag results on or

    before 3rd turn from entry – Ref. FED-STD-H28, Screw

    thread Standards for Federal Services.

    Heli-Coil STI Thread Plug Gages for checking the tapped hole

    are listed in the table at right.

    Working gages provide a guaranteed minimum wear

    allowance on the pitch diameter of the GO members

    of two ten thousandths of an inch (.0002). These gages

    are recommended for production in sizes 1/2 inch

    and smaller.

    Reference gages have pitch diameters on or close to minimum

    (basic size). They are essentially laboratory or master gages

    and should be used in case of conflict between two working

    gages. Conflict can occur when one of the gages has

    experienced more use and wear.

    Both hand and power tools are available to install tanged inserts.

    The various tools to install Heli-Coil inserts are presented on the

    following pages.

    For production runs, prototype work, salvage, and repair,

    hand inserting tools are available. For high volume production,

    power inserting tools are also available. Both types of tools are

    dimensioned (p.29 & 31) to aid determination of accessibility to

    the tapped hole.

    Both hand and power inserting tools feature a threaded mandrel

    which engages the insert and provides a positive lead to guide the

    insert into the tapped hole easily and quickly.

    Power inserting tools consist of an air motor, adapter and front

    end assembly. The front end assembly consists of a prewinder,

    mandrel and 3 spacers (1 for each length of insert to be installed).

    The versatility and adaptability of Heli-Coil power inserting tools is

    shown on p. 32. The tool can be hand held, vertically or horizontally

    mounted, and adapted to both semi-automatic and fully automatic

    installation stations. Heli-Coil power inserting tools can be adapted

    to assembly stations, rotary tables and transfer lines.

    All Heli-Coil tooling is backed by our extensive expertise and

    experience in virtually any application. All tools are fully warranteed.

    In addition, our Application Engineering Department is always

    available to assist in installation techniques and special tooling

    (longer or shorter length tools, etc.). For very high production,

    Heli-Coil will provide for the successful development of automated

    installation systems.

    Heli-Coil manufactures various designs of hand

    inserting tools.

    Generally, finer pitch inserts are proportionately

    larger in the free state than coarse pitch inserts

    and thus have to be “pre-wound” to a smaller

    diameter for installation.

    Large coarse pitch inserts need only a

    threaded mandrel tool for installation.


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