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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.

Products
Application Data
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsCoil Threaded Inserts for Metal - Imperial

Coil Thread Inserts for Metal dimensions

Internal Thread	A	Free Coils	B
Internal Thread	Length		Free Outer Diameter
Imperial Coarse			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

All dimensions are in inches.

Internal Thread	A	Free Coils	B
Internal Thread	Length		Free Outer Diameter
Imperial Fine			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

All dimensions are in inches.

Dimensional SpecificationsCoil Threaded Inserts for Metal - Metric

Internal Thread	A	Free Coils	B
Internal Thread	Length		Free Outer Diameter
Metric Coarse			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

All dimensions are in millimeters.

Internal Thread	A	Free Coils	B
Internal Thread	Length		Free Outer Diameter
Metric Fine			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

All dimensions are in millimeters.

Thread Repair Coil Inserts

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Diameter Length Type Item # Availability Price Quantity UOM

5/16

0.4688

Insert Only

COIL031-18INS

In Stock

$10.3876/PK

See Quantity Discounts

5/16-18 THREAD REPAIR COIL INSERT 10 PACK

$10.3876/PK

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$10.3876/PK
6	$9.84222/PK
18	$8.6721/PK
48	$6.31634/PK

5/16

0.4688

Kit

COIL031-18

In Stock

$44.50187/EA

See Quantity Discounts

5/16-18 THREAD REPAIR KIT WITH 10 INSERTS

$44.50187/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$44.50187/EA
4	$42.1654/EA
8	$37.15244/EA
24	$27.06006/EA

5/16

0.4688

Insert Only

COIL031-24INS

In Stock

$9.74017/PK

See Quantity Discounts

5/16-24 THREAD REPAIR COIL INSERT 10 PACK

$9.74017/PK

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$9.74017/PK
6	$9.22878/PK
18	$8.13159/PK
48	$5.92266/PK

5/16

0.4688

Kit

COIL031-24

In Stock

$45.93741/EA

See Quantity Discounts

5/16-24 THREAD REPAIR KIT WITH 10 INSERTS

$45.93741/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$45.93741/EA
4	$43.52557/EA
8	$38.35091/EA
24	$27.93296/EA

1/2

0.7500

Kit

COIL050-13

In Stock

$76.41401/EA

See Quantity Discounts

1/2-13 THREAD REPAIR KIT WITH 5 INSERTS

$76.41401/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$76.41401/EA
4	$72.40207/EA
8	$63.79434/EA
24	$46.46473/EA

1/2

0.7500

Insert Only

COIL050-13INS

In Stock

$9.64686/PK

See Quantity Discounts

1/2-13 THREAD REPAIR COIL INSERT 5 PACK

$9.64686/PK

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$9.64686/PK
6	$9.14037/PK
18	$8.05369/PK
48	$5.86592/PK

1/2

0.7500

Kit

COIL050-20

In Stock

$72.53517/EA

See Quantity Discounts

1/2-20 THREAD REPAIR KIT WITH 5 INSERTS

$72.53517/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$72.53517/EA
4	$68.72688/EA
8	$60.55609/EA
24	$44.10615/EA

1/2

0.7500

Insert Only

COIL050-20INS

3-5 Working Days

$9.80477/PK

See Quantity Discounts

1/2-20 THREAD REPAIR COIL INSERT 5 PACK

$9.80477/PK

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$9.80477/PK
6	$9.28999/PK
18	$8.18552/PK
48	$5.96194/PK

Thread Repair Coil Inserts

Technical Data

Application Data

InstallationCoil Threaded Insert for Metal

Dimensional Specifications

Dimensional SpecificationsCoil Threaded Inserts for Metal - Imperial

Dimensional SpecificationsCoil Threaded Inserts for Metal - Metric

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Thread Pitch

Thread Type

Diameter

5/16-18 THREAD REPAIR COIL INSERT 10 PACK

5/16-18 THREAD REPAIR KIT WITH 10 INSERTS

5/16-24 THREAD REPAIR COIL INSERT 10 PACK

5/16-24 THREAD REPAIR KIT WITH 10 INSERTS

1/2-13 THREAD REPAIR KIT WITH 5 INSERTS

1/2-13 THREAD REPAIR COIL INSERT 5 PACK

1/2-20 THREAD REPAIR KIT WITH 5 INSERTS

1/2-20 THREAD REPAIR COIL INSERT 5 PACK