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Helicoil 5521-6 3/8-16 Inch Coarse Thread Repair Kit

4.6 out of 5 stars 31 customer reviews
| 6 answered questions

Price: $18.54 & FREE Shipping on orders over $49. Details
In Stock.
Ships from and sold by Amazon.com.
3/8-16
  • Enter your model number above to make sure this fits.
  • The product is 3/8-16thread 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 carded packing
  • Easy to use
51 new from $16.49

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$18.54 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

  • Helicoil 5521-6 3/8-16 Inch Coarse Thread Repair Kit
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  • Helicoil 5521-5 5/16-18 Inch Coarse Thread Repair Kit
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  • Helicoil 5521-4 1/4-20 Inch Coarse Thread Repair Kit
Total price: $58.01
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Product Information

Size:3/8-16

Technical Details

Brand Heli-Coil
Item Weight 3.2 ounces
Product Dimensions 5.8 x 0.6 x 3.6 inches
Origin China
Item model number 5521-6
Exterior Smooth
Manufacturer Part Number 55216
OEM Part Number 5521-6

Additional Information

ASIN B0002SRDVE
Customer Reviews
4.6 out of 5 stars 31 customer reviews

4.6 out of 5 stars
Best Sellers Rank #32,557 in Automotive (See top 100)
#19 in Automotive > Tools & Equipment > Thread Repair Kits > Metric Inserts & Kits
Shipping Weight 4.8 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available October 10, 2006

Warranty & Support

Warranty, Parts:Parts
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Product Description

Size: 3/8-16

3/8-16 course, thread repair kit, includes 12 stainless steel inserts, a tap, & installation tool, in a resealable blister card.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Size: 3/8-16 Verified Purchase
This is a great kit that includes every thing you need to repair stripped threads, or like in my case, create a strong threaded hole in a soft material (aluminum.) The process is pretty straight forward and can be done with just a hand held drill.

I really have only two complaints. First is that the tap is made in China. It worked without issue but this is the main piece needed to make this work. It's not a standard tap size so if it breaks your pretty much starting over. That brings me to issue number 2. Price. These are quite expensive for what you get, especially considering the highest cost item in the kit is made in China.

That said, everything worked perfectly.
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Size: 3/8-16 Verified Purchase
Went right to work just like I knew it could. You can't go wrong with these tools, ever, I highly recommend them. If you can drill a hole, you can repair it, good to know if you like doing your own light repairs and enjoy saving money.
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By TJ on January 1, 2014
Size: 3/8-16 Verified Purchase
i stripped a mounting bolt hole for my thermostat. it took about twenty minutes to drill, tap, and install the heli coil it tells you what size drill bit to use and the tap and inserts are included. I torqued it to spec held just fine. The installation tool and packaging looked different than the picture, but it worked great.
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Size: 3/8-16 Verified Purchase
The Helicoil is the original and most common tread repair insert to the point that the name is used generically. Several variations are available by others but the Helicioi does the job so why experiment.
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Size: 3/8-16 Verified Purchase
Receiving the Heli-Coil product was timely for my project. I expected to receive what was pictured and to my surprise it was a thin red package containing all necessary parts. Fortunately the product was the correct size (3/8-16) so I was able to make the repair. Instructions were rather scant, mainly illustrations, I suppose this was subsuming an appropriate level of mechanical expertise.
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Size: 3/8-16 Verified Purchase
First time I have needed to use one of these, it was easy, with good instructions.
The repair went very smooth with this kit, and there is enough coils to do several repairs.
It was a very inexpensive fix.
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Size: 3/8-16 Verified Purchase
Can't beat the price. If you don't need it that day this is the way to go. If you need it right now then you'll have to pay full list price which is about 4-5 times more. Shipping is fast using standard shipping, only took a few days.
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Size: 3/8-16
bought this kit to repair stripped threads on the aluminum intake manifold (thermostat housing) on my 85 corvette. a 5-stars and two thumbs up. worked like a champ. zero issues!
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