You are bidding on (20) Helicoil type Locking or Screw-Lock inserts. These inserts are for 1/4-28 X 0.250 or 1/4 inch fine - 28 threads per inch screws/bolts that are 0.250 inches long once installed. This auction is for the inserts only. (Drill bits, Taps, Installation and Tang break tools, etc. not included) These inserts were government surplus and you know they're the best quality our tax dollars could buy!!! Only the sizes I have listed are available. Please visit other eBay retailers if the size you need is not listed in my store under the main heading: (Tools / Supplies) Here is a listing of various cross reference numbers for this insert. Please verify the size and type inserts your looking for! Thread Length PERMA-THREAD MS HELI-COIL KATO CHRISLYNN RECOIL 1/4-28 0.25 209F4-0250 MS21209-F4-10 3591-4CN-0250 TLC-4C-0250 84517 14042 Helicoil type inserts: 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-LOCK which provides selflocking torque on the male member by a series of “chords” on one or more of the insert coils. They are available in inch series, coarse and fine. Inch series Screw-Lock inserts are dyed red for identification. Heli-Coil inserts are larger in diameter before installation than the tapped hole. During installation the inserting tool (not included) 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. HERE ARE VARIOUS PRODUCT FEATURES LISTED ON THE HELI-COIL WEBSITE: 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. 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 friction. Under normal environmental conditions, Heli-Coil inserts minimize galvanic action within the threaded assembly because of their superior corrosion resistance. 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. 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. Heli-Coil inserts allow use of smaller bosses, flanges and fasteners than any other insert. Heli-Coil inserts can generally be incorporated in existing designs, where no provision has been made for an insert, without increasing boss size. 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. Maximum clamping action and bolt tension are assured with minimum wrench torque because of the mirror-smooth surface finish of Heli-Coil inserts. Heli-Coil stainless steel inserts can be used in temperatures ranging from –320°F to +800°F. Stringent Quality Assurance and Engineering Standards are rigidly enforced in all phases of the manufacturing process. This assures integrity of your product design. For drill bit or tap sizes please visit www.emhart.com and view the helicoil reference catalog. Refunds will be refunded against Paypal payment made back to your Paypal account. Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items. Thanks for viewing our listings. Please click "Ask A Question", or call us if you have a parts need that you do not see listed here. We will do our best to locate the parts you need, and make every effort to save you money. For parts information in English please call Chris at (813)365-0042. Gracias por ver nuestros anuncios. Por favor, envíe un mensaje, o simplemente llámenos si necesita alguna's pieza que no ves listado. Mencionado Haremos nuestro mejor esfuerzo para localizar las piezas que necesita, y hacer todo lo posible para ahorrar dinero. Para espanol llame a Darcy a el (813) 365-0042.
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