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1/4-20  MS21209C4-15  3177-4  MS21209C4-20  3176-4  25 
5/16-18  MS21209C5-15  3177-5  MS21209C5-20  3176-5  20 
3/8-16  MS21209C6-15  3177-6  MS21209C6-20  3176-6  15 
10-32  MS21209F1-15  3179-3  MS21209F1-20  3178-3  25 
1/4-28  MS21209F4-15  3179-4  MS21209F4-20  3178-4  25 
5/16-24  MS21209F5-15  3179-5  MS21209F5-20  3178-5  20 
3/8-24  MS21209F6-15  3179-6  MS21209F6-20  3178-6  10 
NOTE Twin-sert kits include: inner and outer twin-sert members (quantity listed), a bottoming tap, an outer insert installation tool, and an outer insert tang breakoff tool.  Use standard helical insert installation and tang breakoff tools for the inner member. The inner and outer twin-sert members can be purchased individually from the manufacturer or the manuafacturer’s designated distributor. 
NOMINAL THREAD SIZE  NOMINAL LENGTH  SUGGESTED DRILL SIZE 
1-1/2 DIAMETER  2 DIAMETER  ALUMINUM OR MAGNESIUM  STEEL 
OUTER  INNER  OUTER  INNER 
8-32  0.246  0.215  0.328  0.297  3  7/32 
10-24  0.285  0.243  0.380  0.338  "F"  “G" 
1/4-20  0.375  0.325  0.500  0.450  21/64  “Q” 
5/16-18  0.469  0.413  0.625  0.569  “X"  “Y" 
3/8-16  0.562  0.500  0.750  0.688  15/32  15/32 
10-32  0.285  0.254  0.380  0.349  “C”  “D” 
1/4-28  0.375  0.339  0.500  0.464  5/16  5/16 
5/16-24  0.469  0.427  0.625  0.583  "V”  “V" 
3/8-24  0.562  0.521  0.750  0.700  7/16  7/16 

Repair
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Table 408. Twin-sert Drill Sizes
NOMINAL THREAD SIZE  SUGGESTED DRILL SIZE  SELF-LOCKING HELICAL INSERT PART NUMBER *
ALUMINUM OR MAGNESIUM  STEEL 
UNIFIED COARSE THREADS 
8-32  #17  #16  MS21209C08** 
10-24  13/64  #5  MS21209C1-** 
1/4-20  “H”  “H”  MS21209C4-** 
5/16-18  “Q”  “Q”  MS21209C5-** 
3/8-16  “X”  “X”  MS21209C6-** 
UNIFIED FINE THREADS 
10-32  #7  13/64  MS21209F1-** 
1/4-28  "G”  MS21209F4-** 
5/16-24  21/64  21/64  MS21209F5-** 
3/8-24  25/64  25/64  MS21209F6-** 
* - OTHER DIAMETER INSERTS ARE AVAILABLE ** - INSERT DASH NUMBER FOR LENGTH REQUIRED: 10 - 1 DIAMETER NOMINAL LENGTH 15 - 1-1/2 DIAMETER NOMINAL LENGTH 20 - 2 DIAMETER NOMINAL LENGTH 25 - 2-1/2 DIAMETER NOMINAL LENGTH 30 - 3 DIAMETER NOMINAL LENGTH 

Twin-sert Installation Figure 410
Repair
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Table 409. Twin-sert Drill Data

High Torque Stud-Locking Thread Repair Kit
Figure 411

Repair
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Table 410. Oversize Data (Unified Coarse 1 Diameter)
Nominal Thread Size  Heli-Coil P/N  Effect. Correc. to Oversize Hole 
　
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