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Left Hand Helical Screw Thread Insert Repair Kits

screw thread insert kit  left hand

Screw Thread Kits and Inserts: Left Hand

Left hand screw threads inserts are used to produce new threads or can be used to repair threaded holes which have been damaged or stripped or crossthreaded and refurnish them to their original thread size.

The left hand insert, which is larger in diameter than the tapped hole is compressed during installation then allowed go spring back, permanently anchoring the insert in the tapped hole.

Because of the larger diameter, the insert has a greater contact area and is normally stronger than the original threads

Helical Wire Screw Thread Kits and Inserts are commonly called Heli-coil® or  Helicoil® inserts. 

UNC         UNF         Metric        


 
 

 

 

UNC Left Hand
SizePart #Insert
Per Kit
Drill Size
MMINCH
1/4-20 STK1/4-20LH6 6.7 17/64
5/16-18 STK5/16-18LH6 8.30 21/64
         
3/8-16 STK3/8-16LH6 9.90 25/64
7/16-14 STK7/16-14LH4 11.50 29/64
1/2-13 STK1/2-13LH4 13.00 17/32
5/8-11 STK5/8-11LH2 16.50 21/32
         
3/4-10 STK3/4-10LH2 19.80 25/32
7/8-9 STK7/8-9LH2 23.00 29/32
1-8 STK1-8LH2 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
SizePart #Insert
Per Kit
Drill Size
MMINCH
1/4-28 STK1/4-28LH6 6.60 17/64
5/16-24 STK5/16-24LH6 8.20 21/64
3/8-24 STK3/8-24LH6 9.80 25/64
7/16-20 STK7/16-20LH4 11.50 29/64
1/2-20 STK1/2-20LH4 13.00 33/64
         
5/8-18 STK5/8-18LH2 16.30 41/64
3/4-16 STK3/4-16LH2 19.50 49/64
7/8-14 STK7/8-14LH2 22.50 57/64
1-14 STK1-14LH2 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
SizePart #Insert
Per Kit
Drill Size
MMINCH
6-1 STKM6x1LH6 6.30 1/4
8-1 STKM8x1LH6 8.30 21/64
8-1.25 STKM8x1.25LH6 8.30 21/64
10-1.25 STKM10x1.25LH6 10.30 13/32
10-1.5 STKM10x1.5LH6 10.40 13/32
12-1.25 STKM12x1.25LH6 12.30 31/64
12-1.75 STKM12x1.75LH6 12.50 31/64
         
14-1.5 STKM14x1.5LH4 14.30 9/16
14-2 STKM14x2LH6 14.50 21/32
16-1.5 STKM16x1.5LH4 16.50 21/32
16-2 STKM16x2LH4 16.50 47/64
18-1.5* STKM18x1.5LH4 18.50 23/32
18-2.5 STKM18x2.5LH4 18.80 47/64
         
20-1.5 STKM20x1.5LH2 20.50 13/16
20-2.5 STKM20x2.5LH2 20.80 13/16
22-1.5 STKM22x1.5LH2 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

 

 Trademarks are the properties of their respective owner(s).

 

May 2023, updated March 2017, February 2011 CSS, May 1999

The descriptions, illustrations, specifications, dimensions, and part numbers are subject to change without notice.

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