Helical Thread Insert Kits

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Helical thread insert kits are used to install threaded fasteners in metals, polymers, wood & composites by repairing stripped / damaged tapped holes or creating threaded holes. They are...Read more

StyleModelThread SizeInsert LengthDrill Size
A68921#10-240.31"I
RFQ
A689261/2"-130.62"37/64"
RFQ
A689221/4"-200.37"Q
RFQ
A689243/8"-161/2"29/64"
RFQ
A689235/16"-180.43"X
RFQ
A689257/16"-1414/25"33/64"
RFQ
StyleModelThread SizeInsert LengthDrill Size
A82113H#10-320.19", 0.285", 0.38"13/64"
RFQ
A82145H1 1/2"-122 1/4"1 17/32"
RFQ
A82141H1 1/4"-121 7/8"1 9/32"
RFQ
A82139H1 1/8"-121.688"1 5/32"
RFQ
A82143H1 3/8"-122.062"1 13/32"
RFQ
A82136H1"-121 1/2"1 1/64"
RFQ
A82137H1"-141 1/2"1 1/64"
RFQ
A82126H1/2"-200.5", 0.75", 1"33/64"
RFQ
A82117H1/4"-280.25", 0.375", 0.5"17/64"
RFQ
A82132H3/4"-161 1/8"49/64"
RFQ
A82121H3/8"-240.375", 0.562", 0.75"25/64"
RFQ
A82130H5/8"-180.938"41/64"
RFQ
A82119H5/16"-240.312", 0.469", 0.625"21/64"
RFQ
A82134H7/8"-141.312"57/64"
RFQ
A82123H7/16"-200.438", 0.656", 0.875"29/64"
RFQ
A82128H9/16"-180.844"37/64"
RFQ
StyleModelThread SizeInsert LengthDrill Size
A69963M4 x 0.78 mmI
RFQ
A69964M5 x 0.810 mm11/32"
RFQ
A69965M6 x 112 mm27/64"
RFQ
A69166M8 x 114 mm1/2"
RFQ
A69966M8 x 1.2514 mm1/2"
RFQ
A69967M10 x 1.516 mm37/64"
RFQ
A69167M10 x 1.2516 mm37/64"
RFQ
A69169M12 x 1.2518 mm21/32"
RFQ
A69969M12 x 1.7518 mm21/32"
RFQ
A69170M14 x 1.520 mm47/64"
RFQ
A69970M14 x 220 mm47/64"
RFQ
A69171M16 x 1.522 mm13/16"
RFQ
A69971M16 x 222 mm13/16"
RFQ
A69172M18 x 1.524 mm57/64"
RFQ
A69173M20 x 1.530 mm1 3/32"
RFQ
A69973M20 x 2.530 mm1 3/32"
RFQ
A69174M22 x 1.532 mm1 3/16"
RFQ
A69175M24 x 233 mm1 7/32"
RFQ
A69975M24 x 333 mm1 7/32"
RFQ
StyleModelThread SizeInsert LengthDrill SizeThread Type
A82100#2-560.129"3/32"Coarse
RFQ
A82102#3-480.148"#36Coarse
RFQ
A82104#4-400.168"#31Coarse
RFQ
A82106#5-403/16"#29Coarse
RFQ
A82108#6-320.207"#25Coarse
RFQ
A82110#8-320.246"11/64"Coarse
RFQ
A82112#10-240.285"13/64"Coarse
RFQ
A82114#12-240.324"15/64"Coarse
RFQ
A821441 1/2"-62 1/4"1 17/32"Coarse
RFQ
A821401 1/4"-71 7/8"1 9/32"Coarse
RFQ
A821381 1/8"-71.688"1 5/32"Coarse
RFQ
A821421 3/8"-62.062"1 13/32"Coarse
RFQ
A821351"-81 1/2"1 1/32"Coarse
RFQ
A821241/2"-133/4"17/32"Coarse
RFQ
A821161/4"-203/8"17/64"Coarse
RFQ
A821313/4"-101 1/8"25/32"Coarse
RFQ
A821203/8"-169/16"25/64"Coarse
RFQ
A821295/8"-110.938"21/32"Coarse
RFQ
A821185/16"-180.469"21/64"Coarse
RFQ
A821337/8"-91.312"29/32"Coarse
RFQ
A821227/16"-1421/32"29/64"Coarse
RFQ
A821279/16"-120.844"19/32"Coarse
RFQ
StyleModelThread SizeInsert LengthThread TypeDrill Size
A82150M2 x 0.43 mmCoarse#45
RFQ
A82151M2.2 x 0.453.3 mmCoarse#42
RFQ
A82152M2.5 x 0.453.8 mmCoarse#37
RFQ
A82153M3 x 0.54.5 mmCoarse1/8"
RFQ
A82154M3.5 x 0.65.3 mmCoarse#27
RFQ
A82155M4 x 0.76 mmCoarse11/64"
RFQ
A82156M5 x 0.87.5 mmCoarse13/64"
RFQ
A82157M6 x 19 mmCoarse1/4"
RFQ
A82158M7 x 110.5 mmCoarse9/32"
RFQ
A82159M8 x 112 mmFine21/64"
RFQ
A82160M8 x 1.2512 mmCoarse21/64"
RFQ
A82161M9 x 113.5 mmFine3/8"
RFQ
A82162M9 x 1.2513.5 mmCoarse3/8"
RFQ
A82163M10 x 115 mmFine13/32"
RFQ
A82165M10 x 1.515 mmCoarse13/32"
RFQ
A82164M10 x 1.2515 mmFine13/32"
RFQ
A82166M11 x 116.5 mmFine7/16"
RFQ
A82168M11 x 1.516.55 mmCoarse29/64"
RFQ
A82167M11 x 1.2516.5 mmFine29/64"
RFQ
A82146M12 x 118 mm-31/64"
RFQ
A82170M12 x 1.518 mmFine31/64"
RFQ
A82169M12 x 1.2518 mmFine31/64"
RFQ
A82171M12 x 1.7518 mmCoarse31/64"
RFQ
A82172M14 x 1.521 mmFine9/16"
RFQ
A82147M14 x 1.2521 mm-9/16"
RFQ
CHRISLYNN -

Steel Helical Thread Insert Kits

StyleModelThread SizeInsert LengthDrill SizeGradeMaterialPrice (inc. VAT)
AK9329-004#4-401/4"5/32"Grade 12L14Steel-
RFQ
AK9329-006#6-327/25"#7Grade 12L14Steel-
RFQ
AK9329-008#8-320.29"FGrade 12L14Steel-
RFQ
AK9329-3#10-240.406"5/16"Grade 12L14Steel-
RFQ
BK9329-332#10-320.406"5/16"Grade 12L14Steel-
RFQ
AK9329-161"-81 1/4"1 9/32"Grade 12L14Steel-
RFQ
BK9329-16141"-141 1/4"1 9/32"Grade 12L14Steel-
RFQ
C681121"-141 3/8"1 5/16"-Steel£30.04
AK9329-81/2"-1321/32"21/32"Grade 12L14Steel-
RFQ
BK9329-8201/2"-2021/32"21/32"Grade 12L14Steel-
RFQ
AK9329-41/4"-200.437"23/64"Grade 12L14Steel-
RFQ
BK9329-4281/4"-280.437"23/64"Grade 12L14Steel-
RFQ
AK9329-123/4"-100.781"7/8"Grade 12L14Steel-
RFQ
BK9329-12163/4"-160.781"7/8"Grade 12L14Steel-
RFQ
AK9329-63/8"-160.515"31/64"Grade 12L14Steel-
RFQ
BK9329-6243/8"-240.515"31/64"Grade 12L14Steel-
RFQ
AK9329-105/8"-110.687"49/64"Grade 12L14Steel-
RFQ
BK9329-10F5/8"-180.687"49/64"Grade 12L14Steel-
RFQ
AK9329-55/16"-180.484"27/64"Grade 12L14Steel-
RFQ
BK9329-5245/16"-240.484"27/64"Grade 12L14Steel-
RFQ
AK9329-147/8"-91 1/8"1 7/64"Grade 12L14Steel-
RFQ
BK9329-14147/8"-14-1 7/64"Grade 12L14Steel-
RFQ
AK9329-77/16"-1421/32"17/32"Grade 12L14Steel-
RFQ
BK9329-7207/16"-2021/32"17/32"Grade 12L14Steel-
RFQ
AK9329-99/16"-1221/32"21/32"Grade 12L14Steel-
RFQ
StyleModelThread SizeInsert LengthDrill Size
A69121#10-320.31"I
RFQ
A691261/2"-200.62"37/64"
RFQ
A691221/4"-280.37"Q
RFQ
A691243/8"-241/2"29/64"
RFQ
A691235/16"-240.43"X
RFQ
A691257/16"-2014/25"33/64"
RFQ
StyleModelThread SizeInsert LengthDrill Size
A69900#8-320.31"I
RFQ
A69901#10-240.31"Q
RFQ
A699161 1/2"-62"1 13/16"
RFQ
A699141 1/4"-71.81"1 9/16"
RFQ
A699131 1/8"-71.62"1 7/16"
RFQ
A699111"-81.37"1 5/16"
RFQ
A699061/2"-130.62"45/64"
RFQ
A699021/4"-200.37"X
RFQ
A699093/4"-101 3/25"1 1/16"
RFQ
A699043/8"-161/2"33/64"
RFQ
A699085/8"-110.87"53/64"
RFQ
A699035/16"-180.43"29/64"
RFQ
A699107/8"-91 1/4"1 3/16"
RFQ
A699057/16"-140.62"37/64"
RFQ
A699079/16"-120.81"45/64"
RFQ
POWERCOIL -

Stainless Steel Without Drill Bit, Free Running Helical Thread Insert Kits

StyleModelThread SizeInsert LengthThread TypeDrill SizeNumber Of PiecesIncludesGradePrice (inc. VAT)
A3532-1.1/2K1 1/2"-62 1/4"Coarse39.5 mm10(1) Each: STI Tap, Inserts (5) Each: 1 1/2"-6x2.25", Installation Tool304£443.56
A3534-1.1/2K1 1/2"-122 1/4"Fine38.5 mm10(1) Each: STI Tap, Inserts (5) Each: 1 1/2"-12x2.25", Installation Tool304£443.56
A3532-1.1/4K1 1/4"-71 7/8"Coarse32.5 mm10(1) Each: STI Tap, Inserts (5) Each: 1 1/4"-7x1.875", Installation Tool304£349.16
A3534-1.1/4K1 1/4"-121 7/8"Fine32.5 mm10(1) Each: STI Tap, Inserts (5) Each: 1 1/4"-12x1.875", Installation Tool304£349.16
A3532-1.1/8K1 1/8"-71.688"Coarse29.5 mm10(1) Each: STI Tap, Inserts (5) Each: 1 1/8"-7x1.688", Installation Tool304£316.99
A3534-1.1/8K1 1/8"-121.688"Fine29.5 mm10(1) Each: STI Tap, Inserts (5) Each: 1 1/8"-12x1.688", Installation Tool304£316.99
B3532-1K1"-81 1/2"Coarse26.2 mm4(1) Each: STI Tap, Inserts (10) Each: 1"-8x1.5", Installation Tool304£175.55
C3534-1K1"-121 1/2"Fine26 mm4(1) Each: STI Tap, Inserts (10) Each: 1"-12x1.5", Installation Tool304£179.03
C3535-1K1"-141 1/2"Fine26 mm4(1) Each: STI Tap, Inserts (10) Each: 1"-14x1.5", Installation Tool304£179.03
D3532-1/2KLH1/2"-133/4"Coarse-10(1) Each: HSS STI Tap, Inserts (10) Each: 1/2"-13x0.75", Installation Tool304£143.09
E3552-1/2K1/2"-143/4"-13/16"10(1) Each: STI Tap, Inserts (10) Each: 1/2"-14x0.75", Installation Tool304£229.30
F3552-1/4K1/4"-180.394"-33/64"10(1) Each: STI Tap, Inserts (10) Each: 1/4"-18x0.375", Installation Tool304£152.89
G3532-1/4KLH1/4"-203/8"Coarse-10(1) Each: HSS STI Tap, Inserts (10) Each: 1/4"-20x0.375", Installation Tool304£106.98
H3552-1/8K1/8"-270.237"--10(1) Each: STI Tap, Inserts (10) Each: 1/8"-27x0.188", Installation Tool304£118.24
I3532-3/4K3/4"-101 1/8"Coarse19.8 mm5(1) Each STI Tap, Inserts (10) Each: 3/4"-10x1.125", Installation Tool304£82.86
J3534-3/4K3/4"-161 1/8"Fine19.5 mm5(1) Each: STI Tap, Inserts (10) Each: 3/4"-16x1.125", Installation Tool304£118.40
K3532-3/8KLH3/8"-169/16"Coarse-10(1) Each: HSS STI Tap, Inserts (10) Each: 3/8"-16x0.562", Installation Tool304£154.96
H3552-3/8K3/8"-180.563"-21/32"10(1) Each: STI Tap, Inserts (10) Each: 3/8"-18x0.563", Installation Tool304£191.49
A3532-5/8K5/8"-110.938"Coarse16.5 mm10(1) Each: STI Tap, Inserts (10) Each: 5/8"-11x0.938", Installation Tool304£80.12
A3534-5/8K5/8"-180.938"Fine16.3 mm10(1) Each: STI Tap, Inserts (10) Each: 5/8"-18x0.938", Installation Tool304£70.78
L3532-5/16KLH5/16"-180.468"Coarse-10(1) Each: HSS STI Tap, Inserts (10) Each: 5/16"-18x0.468", Installation Tool304£106.26
I3532-7/8K7/8"-91.312"Coarse23 mm5(1) Each: STI Tap, Inserts (10) Each: 7/8"-9x1.313", Installation Tool304£157.28
J3534-7/8K7/8"-141.313"Fine22.5 mm5(1) Each: STI Tap, Inserts (10) Each: 7/8"-14x1.313", Installation Tool304£136.45
A3532-9/16K9/16"-120.843"Coarse15 mm10(1) Each: STI Tap, Inserts (10) Each: 9/16"-12x0.843", Installation Tool304£93.40
M3534-9/16K9/16"-180.843"Fine14.7 mm10(1) Each: STI Tap, Inserts (10) Each: 9/16"-18x0.843", Installation Tool304£90.49
E-Z LOK -

Carbon Steel Heavy Wall Helical Thread Insert Kits

StyleModelThread SizeThread TypeInternal Thread SizeExternal Thread SizeIncludesMaterialTypePrice (inc. VAT)
AEZ-C108#10-24Coarse--(10) Each: 10-24, (6) Each: 1/2"-13, 1/4"-20, 3/8"-16, 5/16"-18, Molded Plastic CaseCarbon SteelHeavy Wall£99.74
BEZ-M508#10-24, M10 x 1.5, M12 x 1.75, M16 x 2Coarse Internal/Metric External#10-32, 1/4"-28, 5/16"-24, 3/8"-24, 1/2"-20M8 x 1.25, M10 x 1.50, M12 x 1.75, M16 x 2(10) (1/4"-20) M12-1.75, (10) (10-24) M10-1.5, (10) (3/8"-16) M16-2.0, (10) (5/16"-18) M12"-1.75, (6) (1/2"-13) M16-2.0, Molded Plastic CaseCarbon SteelHeavy Wall£113.72
CEZ-F108#10-32Fine--(10) Each: 10-32, (6) Each: 1/2"-20, 1/4"-28, 3/8"-24, 5/16"-24, Molded Plastic CaseCarbon SteelHeavy Wall£95.34
DEZ-C8161"-8Coarse--(2) Each: 1"-8, (6) Each: 1/2"-13, (7) Each: 5/8"-11, 3/4"-10, Molded Plastic CaseCarbon SteelHeavy Wall£105.06
DEZ-F8161"-14Fine--(2) Each: 1"-14, (6) Each: 1/2"-20, (7) Each: 5/8"-18, 3/4"-16, Molded Plastic CaseCarbon SteelHeavy Wall£103.84
EEZ-M6121/2"-13, 3/4"-10, 3/8"-16, 9/16"-12, M10 x 1.5, M12 x 1.75, M6 x 1, M8 x 1.25Metric Internal/Coarse ExternalM10 x 1.5, M12 x 1.75, M6 x 1, M8 x 1.251/2"-13, 3/4"-10, 3/8"-16, 9/16"-12(1/2"-13) M8X1.25, (10) Each: (3/8"-16) M6X1, (6) Each: (3/4"-10) M12X1.75, (9/16"-12) M10X1.5, Molded Plastic CaseCarbon SteelHeavy Wall£96.04
FEZ-M100M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1, M8 x 1.25Metric-M6 x 1, M8 x 1.25, M10 x 1.50, M12 x 1.75(10) Each: M3x0.5, M4x0.7, M5x0.8, M6x1.0, M8x1.25, Molded Plastic CaseCarbon SteelHeavy Wall£125.56
GEZ-M200M10 x 1.5, M12 x 1.75, M16 x 2.0, M8 x 1.25MetricM8 x 1.25, M10 x 1.5, M12 x 1.75, M16 x 2-(10) Each: M8x1.25, (5) Each: M16x2.0, (8) Each: M12x1.75, M10x1.5, Molded Plastic CaseCarbon SteelHeavy Wall£172.05
StyleModelThread SizeInsert LengthDrill Size
A68101#10-320.312"Q
RFQ
A681161 1/2"-122"1 13/16"
RFQ
A681141 1/4"-121.812"1 9/16"
RFQ
A681131 1/8"-121 5/8"1 7/16"
RFQ
A681111"-121 3/8"1 5/16"
RFQ
A681061/2"-205/8"45/64"
RFQ
A681021/4"-283/8"X
RFQ
A681093/4"-161 1/8"1 1/16"
RFQ
A681043/8"-241/2"33/64"
RFQ
A681085/8"-187/8"53/64"
RFQ
A681035/16"-240.437"29/64"
RFQ
A681107/8"-141 1/4"1 3/16"
RFQ
A681057/16"-205/8"37/64"
RFQ
A681079/16"-180.812"45/64"
RFQ
StyleModelThread SizeInsert LengthDrill Size
A68121#10-320.31"I
RFQ
A681261/2"-200.62"37/64"
RFQ
A681221/4"-280.37"Q
RFQ
A681243/8"-241/2"29/64"
RFQ
A681235/16"-240.43"X
RFQ
A681257/16"-2014/25"33/64"
RFQ
NES -

Internal Helical Thread Insert Kits

StyleModelThread SizeNumber Of PiecesIncludesThread TypeTypePrice (inc. VAT)
ANES10085/16" to 1 1/4"4NES21, NES22, NES23, NES24Metric CoarseInternal£746.90
BNES10075/16" to 13/16"3NES21, NES22, NES23Metric CoarseInternal£510.85
CNES10367/8" to 2 5/8"2NES24, NES25Metric CoarseInternal£794.53
NES -

External Helical Thread Insert Kits

StyleModelThread SizeNumber Of PiecesIncludesThread TypeTypePrice (inc. VAT)
ANES10005/32" to 1 1/2"2NES1A, NES2Metric CoarseExternal£413.03
BNES13005/32" to 6"3NES1A, NES2, NES3Metric CoarseExternal£1,376.72
CHRISLYNN -

Carbon Steel Helical Thread Insert Kits

StyleModelThread SizeInsert LengthDrill SizeThread TypeGradeMaterial
A649691/2"-13, 1/4"-20, 3/8"-16, 5/16"-18, 7/16"-140.37", 0.43", 0.5", 0.56", 0.62"-CoarseGrade C1215Carbon Steel
RFQ
B68951M5 x 0.88 mmI-Grade C1215Carbon Steel
RFQ
C69951M5 x 0.88 mmI-Grade C1215Carbon Steel
RFQ
B68952M6 x 110 mm11/32"-Grade C1215Carbon Steel
RFQ
C69952M6 x 110 mm11/32"-Grade C1215Carbon Steel
RFQ
C69153M8 x 112 mm27/64"-Grade C1215Carbon Steel
RFQ
B68153M8 x 112 mm27/64"-Grade C1215Carbon Steel
RFQ
C69953M8 x 1.2512 mm27/64"-Grade C1215Carbon Steel
RFQ
B68953M8 x 1.2512 mm27/64"-Grade C1215Carbon Steel
RFQ
B68955M10 x 1.514 mm1/2"-Grade C1215Carbon Steel
RFQ
C69955M10 x 1.514 mm1/2"-Grade C1215Carbon Steel
RFQ
B68155M10 x 1.2514 mm1/2"-Grade C1215Carbon Steel
RFQ
C69155M10 x 1.2514 mm1/2"-Grade C1215Carbon Steel
RFQ
B68156M12 x 1.2516 mm37/64"-Grade C1215Carbon Steel
RFQ
C69156M12 x 1.2516 mm37/64"-Grade C1215Carbon Steel
RFQ
C69956M12 x 1.7516 mm37/64"-Grade C1215Carbon Steel
RFQ
B68956M12 x 1.7516 mm37/64"-Grade C1215Carbon Steel
RFQ
VOLKEL -

Notch Kit, Wire Thread Inserts Type 1.5D, M 10 x 1.5 Size

ModelItemPrice (inc. VAT)
09015CM4RYZ£51.74
VOLKEL -

Notch Kit, Wire Thread Inserts Type 1.5D, M 4 x 0.7 Size

ModelItemPrice (inc. VAT)
09007CM4RYV£40.89
VOLKEL -

Notch Kit, Wire Thread Inserts Type 1.5D, M 12 x 1.75 Size

ModelItemPrice (inc. VAT)
09021CM4RZA£60.09
VOLKEL -

Notch Kit, Wire Thread Inserts Type 1.5D, M 3 x 0.5 Size

ModelItemPrice (inc. VAT)
09005CM4RYU£40.89
VOLKEL -

Notch Kit, Wire Thread Inserts Type 1.5D, M 5 x 0.8 Size

ModelItemPrice (inc. VAT)
09008CM4RYW£40.89
CHRISLYNN -

Thread Insert Kit, 1/2 In - 13 To 9/16 In - 12 Thread Size, 0.453 In, 0.516 In, 0.578 In, Q, X

ModelItemPrice (inc. VAT)
64970AG8YEF-
RFQ

Helical Thread Insert Kits

Helical thread insert kits are used to install threaded fasteners in metals, polymers, wood & composites by repairing stripped / damaged tapped holes or creating threaded holes. They are ideal for preventing wear, corrosion and over-torque in automobile, aerospace and maintenance applications. Raptor Supplies offers thread insert kits from brands like AVK, Chrislynn, E-Z Lok, NES, Powercoil & Recoil. They provide more strength, versatility & productivity, as well as decreased downtime & maintenance costs than traditional threaded holes.

Frequently Asked Questions

Why is the diameter of some helical thread inserts larger than the tapped hole?

Many helical thread inserts have a slightly larger diameter than the required hole diameter. When the helical insert is being installed, its diameter decreases due to applied torque on the insert's prong / tang. However, once the threaded insert gets installed, it operates like a spring to expand outward into the material and provide strong anchoring.

What is the difference between helical and key locking thread inserts?

  • Helical inserts are free-running inserts that allow attachment with metal fasteners without using any coating or lubricant. They are ideal for particle-free environments and can expand after installation to secure themselves in the base material.
  • Key locking inserts form the strongest hold of all threaded inserts on soft metal surfaces using their distorted internal threads / locking keys that prevent slipping or rotating by driving into the surrounding material. They have superior strength owing to their solid, one-piece metal construction, unlike helical inserts that are made of coiled wire.

How to install a helical thread insert?

  • Select a drill bit according to the length of the insert / screw / bolt to drill out the damaged threading up to the required depth.
  • Use an appropriately sized tap to re-thread the drilled hole in the material.
  • Select a Helicoil thread insert and use the installation tool to wind the insert into the hole.
  • Use the tang break-off rod or punch to remove the tang / prong and allow free passage of the fastener. Large-sized holes or spark plug inserts require long-nose pliers to bend the tang in & out alternately until the tang breaks free.
  • The repaired threaded hole is now ready for fastening applications.

How to install a key-locking thread insert?

  • Drill a hole according to the required application.
  • Tap the drilled hole and wind the insert into the hole.
  • Drive the key into the material using the installation tool & hammer.

Can thread inserts be removed once installed?

Yes, some thread inserts can be removed using removal tools that attach to them & unwind them in the direction opposite to that used during installation. Key locking or rock solid inserts can be removed by bending the locking keys out of the material and using a winding tool to remove the insert out of the base material.

What is the difference between helical and key-locking thread inserts?

  • Helical inserts are free-running inserts that allow attachment with metal fasteners without using any coating or lubricant. They are ideal for particle-free environments and can expand after installation to secure themselves in the base material.
  • key locking thread inserts form the strongest hold of all threaded inserts on soft metal surfaces using their distorted internal threads / locking keys that prevent slipping or rotating by driving into the surrounding material. They have superior strength owing to their solid, one-piece metal construction, unlike helical inserts that are made of coiled wire.

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