10 Best Thread Repair Kits

List Updated September 2022

Bestselling Thread Repair Kits in 2022


Heli-Coil Multi Helicoil 5334-14 Save Thread Repair Kit M14 x 1.25

Heli-Coil Multi Helicoil 5334-14 Save Thread Repair Kit M14 x 1.25
BESTSELLER NO. 1 in 2022
  • This are highly durable
  • This is manufactured in China

Tek Motion 131 pc Stripped Thread Rethread Helicoil Repair Kit Metric M5 M6 M8 M10 M12

Tek Motion 131 pc Stripped Thread Rethread Helicoil Repair Kit Metric M5 M6 M8 M10 M12
BESTSELLER NO. 2 in 2022
  • 📌 This highly useful 131-piece thread repair kit is the perfect solution to a damaged or stripped tapped hole.
  • 📌 Suitable for M5, M6, M8, M10 and M12, the kit creates a stronger internal thread in soft metals and protects tapped threads against wear and damage.
  • 📌 Re-thread tool full set include: insert installations, wire thread inserts, twist drill bits, thread taps, lug breaking tools
  • 📌 All tools were packed in a convenient steel carrying case, ease and fast in collecting and placing the tools.
  • 📌 Coarse Thread Inserts Coil Size: M5x0.8x6.7 mm, M6x1.0x8.0 mm, M8x1.25x10.8 mm, M10x1.5x13.5 mm, M12x1.75x16.3 mm

CalVan Tools 38900 Two Valve Ford Triton Tool Kit - Foolproof Repair System, Spark Plug Thread Repair Kit. Tools and Equipment

CalVan Tools 38900 Two Valve Ford Triton Tool Kit - Foolproof Repair System, Spark Plug Thread Repair Kit. Tools and Equipment
BESTSELLER NO. 3 in 2022
  • Designed to aide in repairing Two Valve Ford Modular Cylinders Heads. A quality, foolproof repair system that is cost effective and fast
  • High quality oversized steel alloy insert will repair other inserts that fail and has no ill effects from heat transfer
  • Total labor time as short as 25 mins, For use on 4.6L, 5.4L and 6.8 V-10 Ford Triton Two Valve Engines
  • For use on years 1996 to 2003, Part No. 389-100 Replacement Inserts
  • nsert size: m14-1.25, Patented
  • Ford spark plug insert installer designed to aide in repairing ford modular cylinder heads
  • Quality, foolproof repair system that is fast, cost effective and simple to use
  • Used to repair damaged heads from blown spark plugs, with an alloy steel insert
  • Patented insert is oversized, heavy duty and can be used to replace previously installed inserts that have failed
  • Includes six inserts; saves both time and money

Heli-Coil Multi Helicoil 5546-6 M6 x 1 Metric Coarse Thread Repair Kit

Heli-Coil Multi Helicoil 5546-6 M6 x 1 Metric Coarse Thread Repair Kit
BESTSELLER NO. 4 in 2022
  • The product is 6x1 Thread Repair Kit
  • Easy and simple use kit
  • The product is manufactured in China
  • Includes 12 inserts, complete instructions, Heli-Coil tap and installation tool
  • Used for repairing tapped holes
  • Made from high quality material
  • Comes in a carded package
  • Easy to use
  • Includes 12 inserts, complete instructions, Heli-Coil tap and installation tool
  • Used for repairing tapped holes
  • Made from high quality material
  • Comes in a carded package
  • Easy to use

Oil Drain Plug Tap Thread Repair Kit Oil Pan Screws Rethread Tool M15 x 1.5mm CR-MO Steel

Oil Drain Plug Tap Thread Repair Kit Oil Pan Screws Rethread Tool M15 x 1.5mm CR-MO Steel
BESTSELLER NO. 5 in 2022
  • Used to tap the damaged thread and slightly enlarge the diameter of oil drain hole, then fit a new drain plug and washer.
  • Ideal for repairing sump, gearbox and differential drain plug threads.
  • Take a washer through the new oil drain plug, and the insert a new oil drain plug.
  • Tap material : CR-MO steel.
  • Tap Size: M15 X 1.5MM.

Universal M11x1.5 head bolt thread repair kit by Time-Sert

Universal M11x1.5 head bolt thread repair kit by Time-Sert
BESTSELLER NO. 6 in 2022

HORUSDY 131Pc Thread Repair Kit, HSS Drill Helicoil Repair Kit Metric M5 M6 M8 M10 M12 (Black)

HORUSDY 131Pc Thread Repair Kit, HSS Drill Helicoil Repair Kit Metric M5 M6 M8 M10 M12 (Black)
BESTSELLER NO. 7 in 2022
  • This Thread Repair kit is Used to Repair or Replace Damaged or Stripped Internal Screw Threads.
  • Ideal for Restoring Damaged Threads, Suitable for Engine Repair and Other Automotive Applications
  • The kit Has Altogether 131 Pieces, All Made According to Professional Standard.
  • Lt Has One HSS Tap for Each Size, One HSS Drill for Each Size, 2 Insert Tools for Each Size, Thread Inserts for Each Size, All Come Complete in a Handy Storage Case.
  • All Tools Were Packed in a Convenient Steel Carrying Case, Ease and Fast in Collecting and Placing the Tools.

Heli-Coil Helicoil 5546-8 M8 x 1.25 Metric Coarse Thread Repair Kit

Heli-Coil Helicoil 5546-8 M8 x 1.25 Metric Coarse Thread Repair Kit
BESTSELLER NO. 8 in 2022
  • The product is 8x1.25Thread Repair Kit
  • Easy and simple use kit
  • The product is manufactured in China
  • Includes 12 inserts, complete instructions, Heli-Coil tap and installation tool
  • Used for repairing tapped holes
  • Made from high quality material
  • Comes in a carded package
  • Easy to use

8milelake 131pcs Stripped Thread Rethread Helicoil Repair Kit Metric M5 M6 M8 M10 M12

8milelake 131pcs Stripped Thread Rethread Helicoil Repair Kit Metric M5 M6 M8 M10 M12
BESTSELLER NO. 9 in 2022
  • 131pcs thread repair kit is the perfect solution to a damaged or stripped tapped hole.
  • Suitable for M5, M6, M8, M10 and M12, the kit creates a stronger internal thread in soft metals and protects tapped threads against wear and damage.
  • Re-thread tool full set include: insert installations, wire thread inserts, twist drill bits, thread taps, lug breaking tools
  • High Impact Metal Case
  • 100% Brand New

Nes NES1025 Universal External/Internal Thread Repair Kit NES1A, 2, 21, 22, 23, 24, 6-Piece

Nes NES1025 Universal External/Internal Thread Repair Kit NES1A, 2, 21, 22, 23, 24, 6-Piece
BESTSELLER NO. 10 in 2022
  • External Capacity is 5/32 to 1 1/2-Inch
  • Internal Capacity is 5/16 to 1 1/4-Inch
  • One hand tool restores inch or metric, right handed or left handed fastener threads
  • No need for calibration or identifying thread types
  • Floating cutters are self-adjusting to any pitch and size within range

Plating Thickness on Screw Threads

Electroplating pieces with sharp points, corners, and edges requires special tactics. This article discusses the difficulty of threaded screws.

Unlike electroless metal plating or chemical conversion coatings in which no electric field from an external source is applied, electroplated metal coating from a bath designed for the purpose coats parts non-uniformly. This may present only a small difficulty if part geometry is not critical and there are no sharp points or edges present, and the area to thickness ratio is not too great. Threads on screws do represent a problem requiring adjustment, especially if screws are lengthy with fine threads.

Physical Characteristics of Electroplating

Consider the nature of the beast. Electroplating involves a number of parameters, including part geometry, current density and plating time. Electricity flows most readily through points and secondly through edges. Contrariwise, the least current flow takes place through recesses and secondly flat surfaces.

Evaluate the geometry. Screws present extremes of high and low current flow regions. The ends of long screws can be compared to a lightning rod. Current flows most readily through points. On the other hand, thread troughs receive the least current flow. Because of their sharpness, thread crests experience the greatest current flow.

Understand the concept of current density. The total electric current that flows through a piece divided by its surface area is called the current density. For example, if 1.2 amperes of current are needed to plate a piece with a surface area of 4 square feet, the current density 0.3 amps-per-square-foot.

Chemical Characteristics and Calculation of Plating Thickness

Recognize the importance of bath chemistry. Electroplating baths vary by chemical composition, which modifies plating characteristics. Some exert a leveling influence on plating thickness, while others exaggerate the problems of geometry. Baths are characterized by the thickness of the metal plate they produce for a given current density for a given time. For instance, a gold-plating bath may produce an average plating thickness of 50 micro-inches (millionths of an inch) in six minutes plating time at 3 ASF (amps-per-square-foot). Although adjusting the current up or down can modify coating thickness, usually it is the plating time that is adjusted.

Consider how most commercial manufacturers have learned to calculate plating thickness on threads. They suggest two solutions to the issue of thread-growth. Some advocate the use of undersized initial thread-pitch diameter. This is costly, and so is usually avoided except in the most critical applications. Instead, most commercial firms choose to reduce plating time by a factor of four. If the desirable average thickness calls for 12 minutes plating time, they will reduce that to 3 minutes.

Case Western Reserve University - Electrochemistry Encyclopedia - Electroplating

National Metal Finishing Resource Center - Nickel Plating from the Sulfamate Bath

Safety Socket LLC - How to Calculate Plating Thickness on Threads

Roton - Plating Consideration for Threads

Greenslade and Company - "Electroplating Thickness Is Not Uniform on Fasteners"

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