CAUTION: HELICOIL. TWIN-SERTS MUST BE INSTALLED AS A SET, TWIN-SERT HELICOILS. ARE NOT INTERCHANGEABLE WITH STANDARD HELICOILS..
(4)  
Install Helicoil. insert per procedure below using epoxy primer in accordance with product specification using "C" (stainless steel) series, unless otherwise specified.

(5)  
Equipment

Helical Inserts, Oversize Heli-Coil Division Helicals, Twin-serts, or Tangless Emhart Fastening Systems Group Helical inserts Shelter Rock Lane
Danbury, CT 06810
Heli-coil Twin-sert Kits  Hell-Coil Division Emhart Fastening Systems Group Shelter Rock Lane Danbury, CT 06810
(6)  
Materials

Mobilgrease 28 (or equivalent)  Mobil Oil Corporation
New York, NY 10017

(7)  
Procedure

NOTE:  Twin-serts can be used when a "no go" gage can be inserted in a tapped hole for helical insert.
Tangless inserts and tanged inserts are interchangeable.
(a)  Heli-coil twin-sert kits include the proper tap and installation tool.  In order to use inserts or twin-serts the hole must be machined oversize and tapped for the proper size inserts observing the following:
CAUTION: DO NOT ATTEMPT TO REPAIR AND10050 BOSS BORES WITH A HELICAL INSERT. THE AND10050 BORES REQUIRE A SPECIAL TYPE OF SEALED INSERT AS EXPLAINED IN THE APPLICABLE MANUAL.
1  Depth of the newly machined hole must not exceed depth of the original hole.
2  Hole being repaired must not break through the side wall or bottom of the newly machined hole and enough stock must be left around the hole to be sure that the part will not crack, break or chip when the insert, bolt or screw is torqued.
3 Hole being repaired should be redrilled to the size required for the insert or twin-
sert being used.
4 Inserts or twin-serts selected should be of a length that will allow the insert to be installed flush 1 turn below the surface of the part to allow maximum length of thread engagement compatible with the depth of the threaded hole.
Repair Page 469 Apr 1/05
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5 When installing a twin-sert, use only the matching inner and outer inserts.  Do not use a standard helical insert as an inner member of a twin-sert application. Be sure both tangs match up when the inner insert is installed into the outer one.
6 Installation torque of a stud into a high torque insert will exceed the torque callout for the same stud installed in magnesium. NOTE: Use a standard size stud when installing into a high torque insert. Lubricate stud threads with Mobilgrease 28 or equivalent before installation.
Table 406. Installation/Extraction Tools
TANGLESS INSERTS 
Nominal Size Inserting Tool No. Extracting Tools 
National or Unified Coarse 
4-40 6-32 8-32 10-24 1/4-20  CT16002-04 CT16002-06 CT16002-2 CT16002-3 CT16002-4  CT16002R-04 CT16002R-06 CT16002R-2 CT16002R-3 CT16002R-4 
National or Unified Fine 
10-32 1/4-28  CT16002-3 CT16003-4  CT16002R-3 CT16003R-4 
NOTE:  Tool numbers listed are those of KATO Spring of Georgia, Inc.  Other equivalent tools which produce the results conforming to this standard may be used.  Use extracting tool on the upper driving notch to reverse rotate the coil back out. 

Repair
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20-00-02/70-00-01

Table 407. Twin-sert Kits
NOMINAL THREAD SIZE  1 - 1/2 DIAMETER NOMINAL LENGTH  2 DIAMETER NOMINAL LENGTH  QUANTITY OF TWlN-SERT ASSEMBLIES IN EACH KIT 
INSERT BEING REPLACED  TWIN-SERT REPAIR KIT  INSERT BEING REPLACED  TWIN-SERT REPAIR KIT 
8-32  MS21209C0815  3177-2  MS21209C0820  3176-2  25 
10-24  MS21209C1-15  3177-3  MS21209C1-20  3176-3  25 
　
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