Thread Repair Coil Inserts
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Thread Repair Coil Inserts

Coil inserts are helically coiled diamond-shaped wire that is inserted into an oversized tapped hole. Once in place, they will bring the inside thread of the coil back to the original thread size. Coil inserts can be used for repair of damaged threads, or for new installations to provide greater thread strength due to their high percentage of thread engagement. Made from corrosion resistant 18-8 stainless steel, these coil inserts can withstand temperatures up to 800°F. Available in both imperial and metric kits that provide inserts, a tap and installation tool.  If more coils are needed, we also offer individual packs of coil inserts.

InstallationCoil Threaded Insert for Metal

1. Drill out the hole with the specified drill.

 

 

 

 

 

 

 

 

2. Confirm that the thread and pitch of the bolt match the tap.

 

 

 

 

 

 

 

 

3. Tap the hole with the specified tap.

 

 

 

 

 

 

 

 

4. Set the stop on the installation tool so the tang is centered in the slot.

 

 

 

 

 

 

 

 

5. Wind the insert into the hole with a slight downward pressure until 1/4 to 1/2 turn below the surface.

 

 

 

 

 

 

 

 

6. Remove the tang by placing the tang break tool (or installation tool) on top of the tang and striking firmly with a hammer.

Dimensional SpecificationsCoil Threaded Inserts for Metal - Imperial

Coil Thread Inserts for Metal dimensions
Internal
Thread
A Free Coils B
Length Free Outer Diameter
Imperial
Coarse
Min Max
2-56 0.129 5.250 0.109 0.113
3-48 0.148 5.000 0.126 0.134
4-40 0.168 4.750 0.144 0.149
5-40 0.188 5.500 0.157 0.165
6-32 0.207 4.750 0.178 0.183
8-32 0.246 6.000 0.205 0.210
10-24 0.285 5.000 0.240 0.248
12-24 0.324 6.000 0.268 0.275
1/4-20 0.375 5.750 0.314 0.322
5/16-18 0.469 6.625 0.384 0.392
3/8-16 0.563 7.250 0.455 0.463
7/16-14 0.656 7.375 0.530 0.538
1/2-13 0.750 7.875 0.600 0.610
9/16-12 0.844 8.250 0.667 0.679
5/8-11 0.938 8.500 0.742 0.752
3/4-10 1.125 9.375 0.880 0.892
7/8-9 1.313 10.000 1.019 1.033
1-8 1.500 10.125 1.162 1.179
1 1/8-7 1.688 9.875 1.315 1.355
1 1/4-7 1.875 11.250 1.443 1.483
1 3/8-6 2.063 10.500 1.598 1.643
1 1/2-6 2.250 11.500 1.716 1.728
  1. All dimensions are in inches.
Internal
Thread
A Free Coils B
Length Free Outer Diameter
Imperial
Fine
Min Max
4-48 0.168 5.625 0.139 0.147
6-40 0.207 6.000 0.170 0.178
8-36 0.246 6.500 0.200 0.208
10-32 0.285 6.875 0.233 0.241
1/4-28 0.375 8.250 0.299 0.307
5/16-24 0.469 8.875 0.370 0.378
3/8-24 0.563 11.000 0.433 0.441
7/16-20 0.656 10.625 0.507 0.515
1/2-20 0.750 12.375 0.567 0.577
9/16-18 0.844 12.500 0.630 0.642
5/8-18 0.938 14.125 0.694 0.706
3/4-16 1.125 15.125 0.831 0.841
7/8-14 1.313 15.000 0.968 0.983
1-14 1.500 19.000 1.097 1.110
1-12 1.500 16.000 1.108 1.120
1 1/8-12 1.688 17.250 1.304 1.334
1 1/4-12 1.875 19.375 1.439 1.469
1 3/8-12 2.063 21.375 1.484 1.496
1 1/2-12 2.250 23.500 1.710 1.745
  1. All dimensions are in inches.

Dimensional SpecificationsCoil Threaded Inserts for Metal - Metric

Coil Thread Inserts for Metal dimensions
Internal
Thread
A Free Coils B
Length Free Outer Diameter
Metric
Coarse
Min Max
M2-0.4 3mm 4.9mm 2.6mm 2.8mm
M2.5-04 3.75mm 5.9mm 3.3mm 3.5mm
M3-0.5 4.5mm 6.3mm 3.8mm 4mm
M3.5-0.6 5.25mm 6.3mm 4.55mm 4.75mm
M4-0.7 6mm 6.1mm 5.15mm 5.35mm
M5-0.8 7.5mm 6.9mm 6.35mm 6.6mm
M6-1.0 9mm 6.9mm 7.6mm 7.85mm
M7-1.0 10.5mm 8.2mm 8.65mm 8.9mm
M8-1.25 12mm 7.4mm 9.85mm 10.1mm
M10-1.50 15mm 8.1mm 12.1mm 12.5mm
M11-1.50 16.5mm 9mm 13.1mm 13.5mm
M12-1.75 18mm 8.4mm 14.4mm 14.8mm
M14-2.0 21mm 8.3mm 17.2mm 17.7mm
M16-2.0 24mm 9.7mm 19.4mm 19.9mm
M18-2.5 27mm 9mm 21.5mm 22mm
M20-2.5 30mm 10mm 23.7mm 24.2mm
M22-2.5 33mm 10.9mm 26.3mm 26.8mm
M24-3.0 36mm 10mm 28.6mm 29.1mm
M27-3.0 40.5mm 11.4mm 32.2mm 32.7mm
M30-3.5 45mm 11mm 35.2mm 35.7mm
M33-3.5 49.5mm 12.2mm 38.3mm 38.8mm
M36-4.0 54mm 11mm 42.1mm 42.6mm
M39-4.0 58.5mm 12.2mm 45.1mm 45.6mm
  1. All dimensions are in millimeters.
Internal
Thread
A Free Coils B
Length Free Outer Diameter
Metric
Fine
Min Max
M8-1.0 12mm 9.5mm 9.85mm 10.1mm
M10-1.25 15mm 9.7mm 12.1mm 12.5mm
M12-1.5 18mm 6.2mm 14.4mm 14.8mm
M14-1.5 21mm 7.4mm 17.2mm 17.7mm
M16-1.5 24mm 13mm 19.4mm 19.9mm
M18-2.0 27mm 11.2mm 21.5mm 22mm
M20-2.0 30mm 12.5mm 23.7mm 24.2mm
M22-2.0 33mm 13.6mm 26.3mm 26.8mm
M24-2.0 36mm 15mm 28.6mm 29.1mm
  1. All dimensions are in millimeters.
Thread Repair Coil Inserts
View
Diameter Length Item # Availability Price Quantity UOM
#4 0.1642 COIL4-40INS In Stock $7.32127/PK PK
#4 0.1642 COIL4-40 In Stock $51.99541/EA EA
#6 0.2105 COIL6-32 In Stock $37.12317/EA EA
#6 0.2105 COIL6-32INS In Stock $8.98651/PK PK
#8 0.2344 COIL8-32INS In Stock $7.13465/PK PK
#8 0.2344 COIL8-32 In Stock $40.31008/EA EA
#10 0.2813 COIL10-24INS In Stock $13.42951/PK PK
#10 0.2813 COIL10-24 In Stock $35.40769/EA EA
#10 0.2813 COIL10-32INS In Stock $9.46503/PK PK
#10 0.2813 COIL10-32 In Stock $45.95656/EA EA
#12 0.3281 COIL12-24 In Stock $42.56388/EA EA
#12 0.3281 COIL12-24INS In Stock $10.26414/PK PK
1/4 0.3750 COIL025-20INS In Stock $7.57011/PK PK
1/4 0.3750 COIL025-20 In Stock $38.61039/EA EA
1/4 0.3750 COIL025-28INS In Stock $8.32616/PK PK
1/4 0.3750 COIL025-28 In Stock $44.79854/EA EA
5/16 0.4688 COIL031-18INS In Stock $10.88142/PK PK
5/16 0.4688 COIL031-18 In Stock $43.19073/EA EA
5/16 0.4688 COIL031-24INS In Stock $9.10135/PK PK
5/16 0.4688 COIL031-24 In Stock $45.93741/EA EA
3/8 0.5625 COIL037-16INS In Stock $11.8863/PK PK
3/8 0.5625 COIL037-16 In Stock $50.50962/EA EA
3/8 0.5625 COIL037-24 In Stock $49.18174/EA EA
3/8 0.5625 COIL037-24INS In Stock $12.23084/PK PK
7/16 0.6563 COIL043-14 In Stock $60.85271/EA EA
7/16 0.6563 COIL043-14INS In Stock $6.6035/PK PK
7/16 0.6563 COIL043-20INS In Stock $10.90057/PK PK
7/16 0.6563 COIL043-20 In Stock $57.99598/EA EA
1/2 0.7500 COIL050-13 In Stock $68.77405/EA EA
1/2 0.7500 COIL050-13INS In Stock $10.12776/PK PK
1/2 0.7500 COIL050-20 In Stock $68.06632/EA EA
1/2 0.7500 COIL050-20INS In Stock $9.80477/PK PK
9/16 0.8438 COIL056-12 In Stock $90.55412/EA EA
9/16 0.8438 COIL056-12INS In Stock $20.29859/PK PK
9/16 0.8438 COIL056-18INS In Stock $15.82926/PK PK
9/16 0.8438 COIL056-18 In Stock $95.79386/EA EA
5/8 0.9375 COIL062-11INS In Stock $21.47/PK PK
5/8 0.9375 COIL062-11 In Stock $97.88257/EA EA
5/8 0.9375 COIL062-18INS In Stock $13.52283/PK PK
5/8 0.9375 COIL062-18 In Stock $95.21484/EA EA
3/4 1.1250 COIL075-10 In Stock $118.6793/EA EA
3/4 1.1250 COIL075-10INS In Stock $28.50416/PK PK
3/4 1.1250 COIL075-16 In Stock $114.45593/EA EA
3/4 1.1250 COIL075-16INS In Stock $28.39506/PK PK
7/8 1.3125 COIL087-09 In Stock $221.09294/EA EA
7/8 1.3125 COIL087-09INS In Stock $28.62475/PK PK
1 1.5000 COIL100-08INS In Stock $41.65949/PK PK
1 1.5000 COIL100-08 In Stock $234.53201/EA EA
1 1.5000 COIL100-14INS In Stock $45.62159/PK PK
1 1/8 1.6875 COIL112-07 In Stock $333.99368/EA EA
1 1/8 1.6875 COIL112-07INS 3-5 Working Days $28.39027/EA EA
1 1/4 1.8750 COIL125-07 In Stock $342.24806/EA EA
1 3/8 2.0625 COIL137-06INS In Stock $236.63508/PK PK
1 3/8 2.0625 COIL137-06 In Stock $442.17628/EA EA
1 1/2 2.2500 COIL150-06 In Stock $600.94746/EA EA
1 1/2 2.2500 COIL150-06INS 3-5 Working Days $148.34912/PK PK
M4 6 mm COILM4-070 In Stock $36.06087/EA EA
M4 6 mm COILM4-070INS In Stock $0.76064/EA EA
M5 7.5 mm COILM5-080 In Stock $48.02613/EA EA
M5 7.5 mm COILM5-080INS In Stock $7.40741/PK PK
M6 9 mm COILM6-100 In Stock $44.35113/EA EA
M6 9 mm COILM6-100INS In Stock $7.70169/PK PK
M8 12 mm COILM8-125INS In Stock $9.58943/PK PK
M8 12 mm COILM8-125 In Stock $55.35458/EA EA
M10 15 mm COILM10-100INS 3-5 Working Days $8.90037/PK PK
M10 15 mm COILM10-100 In Stock $61.90066/EA EA
M10 15 mm COILM10-125 In Stock $57.33563/EA EA
M10 15 mm COILM10-150 In Stock $55.59862/EA EA
M10 15 mm COILM10-150INS In Stock $13.33333/PK PK
M12 18 mm COILM12-125 In Stock $81.39535/EA EA
M12 18 mm COILM12-150 In Stock $62.32176/EA EA
M12 18 mm COILM12-175 In Stock $64.19179/EA EA
M12 18 mm COILM12-175INS In Stock $21.94467/PK PK
M14 21 mm COILM14-125 In Stock $111.10155/EA EA
M14 21 mm COILM14-150 In Stock $95.76514/EA EA
M14 21 mm COILM14-200INS In Stock $20.41344/PK PK
M14 21 mm COILM14-200 In Stock $94.66934/EA EA
M16 24 mm COILM16-150 In Stock $97.94238/EA EA
M16 24 mm COILM16-150INS In Stock $21.92076/PK PK
M16 24 mm COILM16-200 In Stock $101.95234/EA EA
M16 24 mm COILM16-200INS In Stock $21.17786/PK PK
M20 30 mm COILM20-150INS 3-5 Working Days $3.13428/EA EA
M20 30 mm COILM20-150 3-5 Working Days $325.75366/EA EA
M20 30 mm COILM20-250INS 3-5 Working Days $527.27534/EA EA
M20 30 mm COILM20-250 In Stock $158.92908/EA EA