Left Hand Helical Screw Thread Insert Repair Kits

screw thread insert

(right hand shown in picture)

UNC         UNF         Metric        




UNC Left Hand
Size Part # Insert
Per Kit
Drill Size
MM INCH
1/4-20 STK1/4-20LH 6 6.7 17/64
5/16-18 STK5/16-18LH 6 8.30 21/64
         
3/8-16 STK3/8-16LH 6 9.90 25/64
7/16-14 STK7/16-14LH 4 11.50 29/64
1/2-13 STK1/2-13LH 4 13.00 17/32
5/8-11 STK5/8-11LH 2 16.50 21/32
         
3/4-10 STK3/4-10LH 2 19.80 25/32
7/8-9 STK7/8-9LH 2 23.00 29/32
1-8 STK1-8LH 2 26.00 1-1/32

note: The Sets include a High Speed Steel Tap, Inserts and Installation/Tang Break Off Tool.
A drill is not included but the recommended size is listed.

 



UNF Left Hand
Size Part # Insert
Per Kit
Drill Size
MM INCH
1/4-28 STK1/4-28LH 6 6.60 17/64
5/16-24 STK5/16-24LH 6 8.20 21/64
3/8-24 STK3/8-24LH 6 9.80 25/64
7/16-20 STK7/16-20LH 4 11.50 29/64
1/2-20 STK1/2-20LH 4 13.00 33/64
         
5/8-18 STK5/8-18LH 2 16.30 41/64
3/4-16 STK3/4-16LH 2 19.50 49/64
7/8-14 STK7/8-14LH 2 22.50 57/64
1-14 STK1-14LH 2 26.00 1-1/64

note: The Sets include a High Speed Steel Tap, Inserts and Installation/Tang Break Off Tool.
A drill is not included but the recommended size is listed.

 


METRIC Left Hand
Size Part # Insert
Per Kit
Drill Size
MM INCH
6-1 STKM6x1LH 6 6.30 1/4
8-1 STKM8x1LH 6 8.30 21/64
8-1.25 STKM8x1.25LH 6 8.30 21/64
10-1.25 STKM10x1.25LH 6 10.30 13/32
10-1.5 STKM10x1.5LH 6 10.40 13/32
12-1.25 STKM12x1.25LH 6 12.30 31/64
12-1.75 STKM12x1.75LH 6 12.50 31/64
         
14-1.5 STKM14x1.5LH 4 14.30 9/16
14-2 STKM14x2LH 6 14.50 21/32
16-1.5 STKM16x1.5LH 4 16.50 21/32
16-2 STKM16x2LH 4 16.50 47/64
18-1.5* STKM18x1.5LH 4 18.50 23/32
18-2.5 STKM18x2.5LH 4 18.80 47/64
         
20-1.5 STKM20x1.5LH 2 20.50 13/16
20-2.5 STKM20x2.5LH 2 20.80 13/16
22-1.5 STKM22x1.5LH 2 22.50 57/64
24-2 STKM24x2.LH 2 24.50 31/32
24-3 STKM24x3LH 2 24.80 31/32
note: The Sets include a High Speed Steel Tap, Inserts and Installation/Tang Break Off Tool.
A drill is not included but the recommended size is listed.

* M18 extra fine is a different spec and thread form to M 18 Spark Plug

 

 

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