Best Plastic Threaded Inserts in 2026

Daisy
Last Updated: Feb 7, 2026

At a Glance: Our Top Picks for Plastic Threaded Inserts

E-Z LOK EZ-310-720 Thread Repair Kit for Metal Carbon Steel Threaded Inserts 7/16-20 and Installation Tools
#TOP1
E-Z Lok Ez-310-720 Thread Repair Kit For Metal
9.7
PM SCORE
E-Z Lok Externally Threaded Insert, 303 Stainless Steel, 3/8"-16 Internal Threads, 9/16"-12 External Threads, 0.515" Length, Made in US (Pack of 5)
#TOP2
E-Z Lok Externally Threaded Insert, 303 Stainless Steel,
9.7
PM SCORE
E-Z Lok EK30820 Helical Threaded Insert Kit, 304 Stainless Steel, 1/4"-28 Thread Size, 0.500" Installed Length (Pack of 10)
#TOP3
E-Z Lok Ek30820 Helical Threaded Insert Kit, 304
9.3
PM SCORE

* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.

Summary of the Best Plastic Threaded Inserts of 2026

Market Overview
Plastic Threaded Inserts Reviewed
  • Reviews Analyzed: 1581 Items
  • PM Avg. Rating: 5.4 / 10
26 Products Evaluated
  • Highest Price: $108.55
  • Lowest Price: $8.80
  • Avg. Price: $19.23

E-Z Lok Ez-310-720 Thread Repair Kit For Metal Carbon Steel Threaded Inserts 7/16-20 And Installation Tools

E-Z LOK
EZ-310-720
0.56 X 0.00 X 0.00 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in metals with this thread repair tool kit.

THIN WALL CARBON STEEL INSERTS – Kit includes thin wall carbon steel threaded inserts that are ideal for applications where the hole size is an issue.

FOR USE WITH APPLICATIONS – The metal threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

KIT INCLUDES – Convenient kit includes threaded inserts for metal, drill, tap, and threaded insert installation drive tool.

Made In America Thread Repair Inserts

E-Z Lok Externally Threaded Insert, 303 Stainless Steel, 3/8"-16 Internal Threads, 9/16"-12 External Threads, 0.515" Length, Made In Us (Pack Of 5)

E-Z LOK
303-6
0.52 X 0.00 X 0.00 Inches
0.07 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Easy to Use Solution For Repairing Damaged Threads in Metal

Install With Standard Drill & Tap; NO Special Tools Needed

Self Locking; Preapplied Adhesive Activates Upon Installation and is Fastener-Ready in 3-5 Minutes

Ideal For Soft Metals Like Aluminum, Cast Iron, or Magnesium

Made in America - Strong, Solid Construction Design

E-Z Lok Ek30820 Helical Threaded Insert Kit, 304 Stainless Steel, 1/4"-28 Thread Size, 0.500" Installed Length (Pack Of 10)

E-Z LOK
EK30820
8.60 X 4.70 X 1.20 Inches
0.02 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with this helical thread repair kit.

18-8 STAINLESS STEEL WIRE – Kit includes 18-8 stainless steel threaded inserts that are resistant to corrosion and can withstand temperatures to 800°F.

FOR USE WITH APPLICATIONS – The metal threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

KIT INCLUDES – Convenient kit includes coil threaded inserts for metal, STI tap, and threaded insert installation tool.

#TOP4

E-Z Lok - 303-332 E-Z Lok Externally Threaded Insert, 303 Stainless Steel, #10-32 Internal Threads, 3/8"-16 External Threads, 0.406" Length, Made In Us (Pack Of 5)

E-Z LOK
303-332
0.41 X 0.00 X 0.00 Inches
0.05 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
IndustrialSupplies 9.47

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 303 stainless steel threaded inserts machined out of solid steel for strength. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

E-Z Lok - 303-4 E-Z Lok Externally Threaded Insert, 303 Stainless Steel, 1/4"-20 Internal Threads, 7/16"-14 External Threads, 0.437" Length, Made In Us (Pack Of 5)`

E-Z LOK
303-4
4.00 X 0.50 X 0.50 Inches
0.05 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Easy to Use Solution For Repairing Damaged Threads in Metal

Install With Standard Drill & Tap; NO Special Tools Needed

Self Locking; Preapplied Adhesive Activates Upon Installation and is Fastener-Ready in 3-5 Minutes

Ideal For Soft Metals Like Aluminum, Cast Iron, or Magnesium

Made in America - Strong, Solid Construction Design

E-Z Lok - 653-6 E-Z Lok Externally Threaded Insert, 303 Stainless Steel/Metric, M6-1.0 Internal Threads, 3/8"-16 External Threads, 10.31Mm Length, Made In Us (Pack Of 5)

E-Z LOK
653-6
4.00 X 0.50 X 0.50 Inches
0.02 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 303 stainless steel threaded inserts machined out of solid steel for strength. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

20Pcs Stainless Steel Sus303 Self Tapping Slotted Screw Thread Insert Nuts For Helical Repair M8 X 15Mm

HILITAND
HILITAND2GVCFXI1T5
5.91 X 3.15 X 1.18 Inches
0.22 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
tanus 9.70

Features

EASY TO INSTALL: These self-tapping thread inserts has self-tapping ability, does not need to be pre-tapped, can be directly used by the installation tool to screw it into a specific hole.

SAFE: Threaded Insert has the ability of strong vibration resistance, which can prevent loose.Can be used in many different places.

HELP TO MAINTENANCE: A damaged screw hole can be used as normal after installed a thread insert.

SIZE: Inner Thread Size: M8(diameter) x 1.25(pitch), Outer Thread Size: M12(diameter) x 1.5(pitch), Length: 15mm, Drilling Diameter: 10.6~10.8mm(plastic); 11~11.2mm(aluminum alloy); 11.2~11.4mm(cast iron), Min. Drilling Depth: 18mm.

WIDELY APPLICATION: It is widely used in automobile industry, rail car industry, ship industry, household appliances and many other places.

E-Z Lok - 319-5 E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets Aisi 12L14, 5/16"-18 Internal Threads, 7/16"-14 External Threads, 0.437" Length, Made In Us (Pack Of 10)

E-Z LOK
319-5
4.00 X 1.00 X 0.60 Inches
0.01 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 12L14 Carbon steel threaded inserts. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

IMPORTANT NOTE: Installation requires the use of a Letter X drill.

E-Z Lok Sk20920 Helical Threaded Insert Kit, 304 Stainless Steel, 5/16"-18 Thread Size, 0.625" Installed Length (Pack Of 10)

E-Z LOK
SK20920
0.04 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with this helical thread repair kit.

STAINLESS STEEL WIRE – Kit includes stainless steel threaded inserts that are resistant to corrosion and can withstand temperatures to 800°F.

FOR USE WITH APPLICATIONS – The metal threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

KIT INCLUDES – Convenient kit includes coil threaded inserts for metal, drill, STI tap, threaded insert installation tool, and tang break tools.

E-Z Lok - 329-801 E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets Aisi 12L14, 1/2"-13 Internal Threads, 3/4"-10 External Threads, 1.000" Length, Made In Us (Pack Of 5)

E-Z LOK
329-801
1.00 X 0.00 X 0.00 Inches
0.20 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
IndustrialSupplies 9.47

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 12L14 Carbon steel threaded inserts. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

E-Z Lok - 303-5 E-Z Lok Externally Threaded Insert, 303 Stainless Steel, 5/16"-18 Internal Threads, 1/2"-13 External Threads, 0.484" Length, Made In Us (Pack Of 5)

E-Z LOK
303-5
4.00 X 0.50 X 0.50 Inches
0.05 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Easy to Use Solution For Repairing Damaged Threads in Metal

Install With Standard Drill & Tap; NO Special Tools Needed

Self Locking; Preapplied Adhesive Activates Upon Installation and is Fastener-Ready in 3-5 Minutes

Ideal For Soft Metals Like Aluminum, Cast Iron, or Magnesium

Made in America - Strong, Solid Construction Design

E-Z Lok - 329-8 E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets Aisi 12L14, 1/2"-13 Internal Threads, 3/4"-10 External Threads, 0.656" Length, Made In Us (Pack Of 5)

E-Z LOK
329-8
0.66 X 0.00 X 0.00 Inches
0.17 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 12L14 Carbon steel threaded inserts. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

E-Z Lok Threaded Insert For Metal Thin Wall 303 Stainless Steel Thread Inserts 8-32 X 1/4-28 Pack Of 5

E-Z LOK
313-008
4.00 X 4.00 X 1.00 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

THREADED INSERTS FOR METAL – E-Z LOK Thin Wall Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 303 stainless steel threaded inserts machined out of solid steel for strength. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts. The Thin Wall feature reduces the hole size.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

E-Z Lok - 319-8 E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets Aisi 12L14, 1/2"-13 Internal Threads, 5/8"-11 External Threads, 0.625" Length, Made In Us (Pack Of 5)

E-Z LOK
319-8
4.00 X 0.80 X 0.80 Inches
0.01 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Small Town Premium Supplements 9.82

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 12L14 Carbon steel threaded inserts. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

IMPORTANT NOTE: Installation requires the use of a 37/64 drill.

E-Z Lok Sk20820 Helical Threaded Insert Kit, 304 Stainless Steel, 1/4"-20 Thread Size, 0.500" Installed Length (Pack Of 10)

E-Z LOK
SK20820
0.03 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with this helical thread repair kit.

STAINLESS STEEL WIRE – Kit includes stainless steel threaded inserts that are resistant to corrosion and can withstand temperatures to 800°F.

FOR USE WITH APPLICATIONS – The metal threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

KIT INCLUDES – Convenient kit includes coil threaded inserts for metal, drill, STI tap, threaded insert installation tool, and tang break tools.

#TOP16

E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets Aisi 12L14/Metric, M8-1.25 Internal Threads, 1/2"-13 External Threads, 12.29Mm Length, Made In Us (Pack Of 10)

E-Z LOK
650-8
12.29 X 0.00 X 0.00 Inches
0.11 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
IndustrialSupplies 9.47

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – C12L14 Carbon steel threaded inserts. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

E-Z Lok Sk20815 Helical Threaded Insert Kit, 304 Stainless Steel, 1/4"-20 Thread Size, 0.375" Installed Length (Pack Of 10)

E-Z LOK
SK20815
8.70 X 4.60 X 0.80 Inches
0.02 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with this helical thread repair kit.

STAINLESS STEEL WIRE – Kit includes stainless steel threaded inserts that are resistant to corrosion and can withstand temperatures to 800°F.

FOR USE WITH APPLICATIONS – The metal threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

KIT INCLUDES – Convenient kit includes coil threaded inserts for metal, drill, STI tap, threaded insert installation tool, and tang break tools.

#TOP18

E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets Aisi 12L14, 5/8"-11 Internal Threads, 1"-8 External Threads, 0.781" Length, Made In Us (Pack Of 5)

E-Z LOK
335-10
0.78 X 0.00 X 0.00 Inches
0.26 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 12L14 Carbon steel threaded inserts. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets Aisi 12L14, #4-40 Internal Threads, #10-32 External Threads, 0.250" Length, Made In Us (Pack Of 10)

E-Z LOK
329-004
0.25 X 0.00 X 0.00 Inches
0.10 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 12L14 Carbon steel threaded inserts. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

#TOP20

E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets Aisi 12L14, #10-32 Internal Threads, 5/16"-18 External Threads, 0.315" Length, Made In Us (Pack Of 10)

E-Z LOK
319-332
4.00 X 0.50 X 0.50 Inches
0.03 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 12L14 Carbon steel threaded inserts. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

IMPORTANT NOTE: Installation requires the use of a Letter I drill.

E-Z Lok - 335-6 E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets Aisi 12L14, 3/8"-16 Internal Threads, 5/8"-11 External Threads, 0.656" Length, Made In Us (Pack Of 5)

E-Z LOK
335-6
0.66 X 0.00 X 0.00 Inches
0.05 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 12L14 Carbon steel threaded inserts. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

E-Z Lok Sk31020 Helical Threaded Insert Kit, 304 Stainless Steel, 3/8"-24 Thread Size, 0.750" Installed Length (Pack Of 10)

E-Z LOK
SK31020
0.55 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with this helical thread repair kit.

STAINLESS STEEL WIRE – Kit includes stainless steel threaded inserts that are resistant to corrosion and can withstand temperatures to 800°F.

FOR USE WITH APPLICATIONS – The metal threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

KIT INCLUDES – Convenient kit includes coil threaded inserts for metal, drill, STI tap, threaded insert installation tool, and tang break tools.

E-Z Lok - 329-6 E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets Aisi 12L14, 3/8"-16 Internal Threads, 9/16"-12 External Threads, 0.515" Length, Made In Us (Pack Of 10)

E-Z LOK
329-6
4.00 X 1.50 X 0.70 Inches
0.10 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 12L14 Carbon steel threaded inserts. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

E-Z Lok Externally Threaded Insert, 303 Stainless Steel, 3/8"-16 Internal Threads, 9/16"-12 External Threads, 0.515" Length, Made In Us

E-Z LOK
316-6
0.52 X 0.00 X 0.00 Inches
0.01 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

THREADED INSERTS FOR METAL – E-Z LOK Thread Inserts for metal. Solid threaded inserts that are strong, easy to install, and self-locking. For optimal holding power in metal.

INSTALL WITH STANDARD TOOLS – 316 stainless steel threaded inserts machined out of solid steel for strength. Install with standard tools. No special drills, taps, or special installation tools are needed.

QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with these steel thread inserts.

FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc.

STRONG THREADS MADE EASY – Simply drill the hole with a standard drill. Tap the hole with a standard tap. Turn in the insert with a screwdriver, bolt/jam nut, or an E-Z LOK drive tool.

Uxcell Self Tapping Threaded Inserts M6 M10X14Mm Carbon Steel Repairing Nuts 10Pcs

UXCELL
A21073000UX0118
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amadeo City 9.87

Features

Product Name: Threaded Inserts; Finish: Nickel Plated; Color: Silver Tone; Inner Thread Size: M6 x 1((Dia.x Pitch); Outer Thread Size: M10 x 1.5(Dia.x Pitch); Length: 14mm / 0.55"

Min. Drilling Size: 3 x 5.5mm / 0.12"x0.22"(wide*depth); Reference Drilling Diameter: 12.6-12.8mm(Plastic), 13-13.3mm(Aluminum Alloy), 13.2-13.4mm(Cast Iron)

Material: Carbon steel material, suitable for aluminum alloy, copper alloy, plastic and other substrates with low engineering strength. Strong resistance to vibration, can prevent loosening.

Advantages: With self-tapping capability, the base material does not need to be tapped in advance. It has a repairing effect on the female thread of the broken tooth, can continue to use the same screws by using the self-tapping screw sleeve.

Application: Installation easily, and only one assembly tool is required. It is widely used in household appliances, the shipping industry, construction machinery, electronic products, modular furniture and other places.

Uxcell Self Tapping Threaded Inserts M3 M5X6Mm 45# Carbon Steel Repairing Nuts 40Pcs

UXCELL
A21073000UX0123
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amadeo City 9.87

Features

Product Name: Threaded Inserts; Finish: Zinc Plating; Color: Gold Tone; Inner Thread Size: M3 x 0.5((Dia.x Pitch); Outer Thread Size: M5 x 0.5(Dia.x Pitch); Length: 6mm / 0.24"

Min. Drilling Size: 1 x 2.5mm / 0.04"x0.1"(wide*depth); Reference Drilling Diameter: 4.5-4.6mm(Plastic), 4.6-4.7mm(Aluminum Alloy), 4.7-4.8mm(Cast Iron)

Material: 45# Carbon steel material, suitable for aluminum alloy, copper alloy, plastic and other substrates with low engineering strength. Strong resistance to vibration, can prevent loosening.

Advantages: With self-tapping capability, the base material does not need to be tapped in advance. It has a repairing effect on the female thread of the broken tooth, can continue to use the same screws by using the self-tapping screw sleeve.

Application: Installation easily, and only one assembly tool is required. It is widely used in household appliances, the shipping industry, construction machinery, electronic products, modular furniture and other places.

Top 10 threaded inserts Brands on Amazon

Here is the list of top-rated brands that were evaluated by PM.

Brand Count
E-Z Lok 23
Uxcell 2
Hilitand 1

Top 10 threaded inserts Brands Pie Chart


We've carried out a comprehensive analysis of 1,581 reviews on threaded inserts, using our selection criteria to identify the best options in the fasteners. Our findings reveal that most customers typically select threaded inserts priced around $19.23, with top brands including sprite science, hilitchi and e-z lok and reegoo

Our team of expert editors reviewed these high-quality items and handpicked the top 26 threaded inserts for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the fasteners category. These include up2u, hilitchi and amazon.com and reegoo us .

We are dedicated to assisting our users in finding the right inserts Products based on their needs, saving them considerable time when choosing which threaded inserts to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.