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Permatex 27100 High Strength Threadlocker Red, 6 ml

4.7 out of 5 stars 2,325 ratings
$5.98
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Size: 6 ml
Style: Liquid - High Strength
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Purchase options and add-ons

Brand Permatex
Specific Uses For Product Heavy-Duty Applications, All Nut and Bolt Applications, Cylinder block and rocker arm studs, Ring gear bolts, Frame bolts, Shock absorber bolts See more
Material Plastic
Compatible Material Metal
Item Form Product

About this item

  • Adds 3,000 PSI holding power on slip and press fit assemblies
  • Well-suited for permanently locking studs and press fits
  • Replaces set screws and snap rings and also locks against vibration loosening
  • May require heat or special tools for removal
  • Suggested Applications: Cylinder block and rocker arm studs, ring gear bolts, frame bolts, shock absorber bolts
› See more product details

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Permatex 27100 High Strength Threadlocker Red, 6 ml
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 5 x 3.81 x 6.5 inches; 0.64 ounces
  • Item model number ‏ : ‎ 27100
  • Department ‏ : ‎ unisex-adult
  • Batteries ‏ : ‎ 1 Unknown batteries required.
  • Date First Available ‏ : ‎ February 17, 2007
  • Manufacturer ‏ : ‎ Permatex
  • ASIN ‏ : ‎ B000AAM2Z6
  • Customer Reviews:
    4.7 out of 5 stars 2,325 ratings

Product Description

Permatex High Strength Threadlocker Red Formula is ideal for heavy-duty applications 10mm to 25mm and is especially well-suited for permanently locking studs and press fits. This high strength threadlocker adds 3,000 PSI holding power on slip and press fit assemblies and replaces set screws and snap rings. It also locks against vibration loosening. May require heat or special tools for removal. Applied as a liquid or gel, threadlockers are superior to conventional lock washers, nylon inserts, and other mechanical devices because they secure the entire fastener assembly against loosening from shock and vibration by filling the space between threaded metal parts, curing to form a tough, adhesive bond and seal. They also seal the threads against leakage, preventing rust and corrosion.

Important information

Legal Disclaimer

Warning: Product may contain materials cautioned by California Proposition 65

Top Brand: Permatex

Highly Rated
100K+ customers rate items from this brand highly
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From the brand

Previous page
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    Featured Products

  3. Permatex is a leading manufacturer and distributor of premium chemical products to the automotive maintenance and repair, home and hardware markets. Product categories include gasket makers, sealants, hand cleaners, threadlockers, adhesives, cleaners, repair kits, and lubricants.

  4. Permatex is a leading automotive chemical manufacturer for both professionals and DIY'ers.

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    Gasket Makers

    Visit the Store

  6. Permatex 25835 High Strength Removable Threadlocker Orange Gel, 35 g
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    Permatex 27835 High Strength Threadlocker Red Gel, 35g
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    Thread Compounds

    Visit the Store

Next page

From the manufacturer

red threadlocker, thread locker, loctite, best threadlocker, permanant
red threadlocker, thread locker, loctite, best threadlocker, permanent

Permatex High-Strength Threadlocker Red

Permatex High-Strength Threadlocker Red is ideal for heavy-duty applications 3/8″ to 1″ (10mm to 25mm) Red threadlocker is well-suited for permanently locking studs and press fits. Threadlocker RED adds 3,000 PSI holding power on slip and press fit assemblies, and replaces set screws and snap rings. Permatex’s Threadlocker Red locks against vibration loosening. May require heat or special tools for removal.

Designed with Mechanic’s Needs in Mind

red threadlocker, thread locker, loctite, best threadlocker, permanent

Gel and Liquid Formulas

Permatex Threadlocker Red is available in both the Gel and Liquid formula for your preference. The Gel formula provides “liquid-reliability” without drips, globs, mess or waste

red threadlocker, thread locker, loctite, best threadlocker, permanent

Permanent-High Strength Hold

Permatex Threadlocker Red is a high strength threadlocker perfect for those heavy-duty applications. This formula adds 3,000 PSI holding power. Requires localized heat and hand tools to remove

red threadlocker, thread locker, loctite, best threadlocker, permanent

Lock It In

This formula adds 3,000 PSI holding power to your job helping to prevent bold and screws from loosening due to vibration and is especially well suited for permanently locking in studs and press fits

red threadlocker, thread locker, loctite, best threadlocker, permanent

Perfect for

Threaded and slip fit joints, cylinder block and rocker arm studs, ring gear bolts, transmission and shaft bolts, strut or shock hardware, control arm hardware and many motorcycle applications

high strength threadlocker, removable threadlocker, loctite
Red
Orange
Blue
Buying Options
Customer Reviews
4.7 out of 5 stars 2,325
4.7 out of 5 stars 2,085
4.7 out of 5 stars 11,608
Price $9.50 $10.98 — no data
Formulas Liquid and Gel Liquid and Gel Liquid and Gel
Strength Permanent- High High - Removable Medium
Removability Requires heat and hand tools Hand tools Hand tools
Applications Threaded and slip fit joints, cylinder block and rocker arm studs, ring gear bolts, transmission and shaft bolts, strut or shock hardware, control arm hardware and many motorcycle applications Case half bolts, triple tree fasteners, stator bolts, axle nuts, dirt bikes, heavy-duty construction, power tools, lawn and garden Valve cover bolts, water pump bolts, oil pan bolts, drive shaft bolts, carburetor studs

What's in the box

  • Permatex 27100

    • Customer reviews

    4.7 out of 5 stars
    2,325 global ratings

    Review this product

    Share your thoughts with other customers
    Write a customer review

    Customers say

    Customers find the threadlocker works well, particularly on suspension and brake applications, and appreciate its gel consistency that stays in place. The product is easy to apply and offers good value for money, with one customer noting it's functional for 1/5 the cost. While the bottle size is convenient, with one mentioning it fits well in a tool box, some customers report receiving bottles nearly empty. The strength receives mixed feedback, with some saying it maintains 90% of its holding strength while others find it not as strong as advertised.

    Select to learn more

    Works greatValue for moneyThread lockEase of applicationSizeHoldStrengthBottle empty
    168 customers mention "Works great"164 positive4 negative

    Customers find that the threadlocker works well, with one customer specifically mentioning its effectiveness on suspension and brake applications, while another successfully used it to refurbish their bolt carrier.

    "It worked perfect, except it didnt seem to have a whole lot in it, don't know if it had dried up a little in shipping or storage, but it did work..." Read more

    "Great product!! Thank you" Read more

    "...The 10 ml bottle is easy to use and very effective. Great for keeping bolts and screws in place." Read more

    "This was perfect for use on my header bolts. No issues so far. As a side note, it is a very convincing simulator for red bodily fluids...." Read more

    37 customers mention "Value for money"31 positive6 negative

    Customers find the threadlocker to be a great value.

    "...Product arrived fast and was reasonably priced, actually it was a few dollars cheaper than the retail auto stores...." Read more

    "Good value compared to the Loctite brand but just as functional for 1/5 the cost...." Read more

    "...Permatex is a good brand. This is less expensive than in most stores. Use the blue "removable" type for most applications...." Read more

    "...These are great prices here at amazon as a prime member and I've gotten my money back 100 times over. Buy with confidence. RagenRat :0)" Read more

    35 customers mention "Thread lock"29 positive6 negative

    Customers find the threadlocker effective, securely locking threads and providing reliable adhesion.

    "...It has proven to be very effective in preventing loosening." Read more

    "It securely locks threads and withstands high temperatures. The 10 ml bottle is easy to use and very effective...." Read more

    "...SO far the Red Thread lock is holding well...." Read more

    "This is my favorite thread lock. The gel doesn't dry out...." Read more

    24 customers mention "Ease of application"24 positive0 negative

    Customers find the threadlocker easy to apply, noting that the gel form makes it more convenient than liquid alternatives and requires only a small amount.

    "Nice to work with but this tube is way too small for professional use. It’s great for a car or two so it should be sufficient for home mechanics." Read more

    "...This went one easily and dried well...." Read more

    "...The 10 ml size is perfect for various projects, and it’s easy to apply. It has proven to be very effective in preventing loosening." Read more

    "...The 10 ml bottle is easy to use and very effective. Great for keeping bolts and screws in place." Read more

    16 customers mention "Size"13 positive3 negative

    Customers appreciate the size of the threadlocker, noting that it stays tight and comes in a good-sized tube, with one customer mentioning it fits well in their toolbox.

    "...This is a good size tube considering you only need a few drops per bolt. The tube is blue but it is the RED PERMANENT threadlocker...." Read more

    "This worked great on my Harley Davidson for keeping the Primary Compensator Bolt tight...." Read more

    "love the easy squeeze sides of the bottle Gel glue is much better for most applications...." Read more

    "A nice small size of threadlocker red to put on those bolts that you dont want to come back out easily." Read more

    13 customers mention "Hold"13 positive0 negative

    Customers praise the threadlocker's secure hold, noting that it stays in place and grabs well, with one customer specifically mentioning its effectiveness under high heat conditions.

    "It holds fasteners securely even under high heat. The 10 ml size is perfect for various projects, and it’s easy to apply...." Read more

    "...that said, it does hold pretty well. I used to hold button head bolts into threaded hex connectors...." Read more

    "Follow the directions and it holds like a champ. Clean dirt and grease from threads before applying" Read more

    "...I was able to apply just the right amount and it stayed where I put it...." Read more

    48 customers mention "Strength"33 positive15 negative

    Customers have mixed opinions about the threadlocker's strength, with some finding it super strong and reliable, while others report it not being as strong as advertised and having poor quality.

    "It securely locks threads and withstands high temperatures. The 10 ml bottle is easy to use and very effective...." Read more

    "...This is rated to maintain 90% of its holding strength up until 450 degrees F. However, and this is good news, it states that you must heat it to..." Read more

    "...Permatex ITW makes products with really poor quality control, and has one of the world's worst "customer service" departments. Period." Read more

    "...the bolts and nuts in place on my tuned harley then it holds up through just about anything." Read more

    20 customers mention "Bottle empty"3 positive17 negative

    Customers report receiving nearly empty bottles of the threadlocker, with one customer noting it contained only about 2-5 drops of liquid.

    "...her the video of my "unboxing" of the products and that the bottles were near empty. I could not upload the 250MB+ file with my email...." Read more

    "Product is probably fine, but the "HUGE" bottle had JUST enough to do one spark plug insert job!..." Read more

    "...It seems to be working but hardly anything in bottle. I would return but waited too long after receipt to use it and now out of time...." Read more

    "Second time I’ve bought this only to have empty bottles show up...." Read more

    Fingers Crossed
    5 out of 5 stars
    Fingers Crossed
    There's an exhaust manifold bracket on a motorcycle that keeps vibrating loose. Standard thread locker cannot tolerate the heat. This is my last resort 🤞
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    Top reviews from the United States

    • sheri
      5.0 out of 5 stars Reliable Threadlocker for High Temperatures
      Reviewed in the United States on June 19, 2025
      Size: 10 mlStyle: Liquid - High TemperatureVerified Purchase
      I love the Permatex 27200 High Temperature Threadlocker in red! It's perfect for preventing loosening and leakage in high heat conditions...
      Helpful
       Report
    • Janet T.
      5.0 out of 5 stars This was recommended Works great!!
      Reviewed in the United States on December 7, 2024
      Size: 10 mlStyle: Liquid - High TemperatureVerified Purchase
      I bought a cast iron knight fireplace set on Amazon. I read a review and the person said that the nuts and the bolts to hold the utensils together would come loose so he recommended using Permatex Threadlocker Red. I bought this on Amazon and it did the trick. The heat of the fireplace does not affect the glue at all.
      One person found this helpful
      Helpful
       Report
    • Paul Gonzales
      5.0 out of 5 stars It’s good
      Reviewed in the United States on November 14, 2024
      Size: 5 mlStyle: Gel - High StrengthVerified Purchase
      Nice to work with but this tube is way too small for professional use. It’s great for a car or two so it should be sufficient for home mechanics.
      Helpful
       Report
    • Amazon Customer
      5.0 out of 5 stars If you work on cars like I do you will need a good product named thredlocker like Permatex.
      Reviewed in the United States on August 3, 2024
      Size: 6 mlStyle: Liquid - High StrengthVerified Purchase
      I have worked on cars and trucks for most of my adult life ; you cannot do proper repairs
      to engine parts or rebuilds/ repairs without using a product like threadlocker to make
      sure your bolts and nuts are secured and not vibrate or loosen over time. It make you feel
      more sure your repairs will stay secured.
      Helpful
       Report
    • Robert J
      4.0 out of 5 stars performed the way it was intended
      Reviewed in the United States on July 8, 2024
      Size: 10 mlStyle: Liquid - High TemperatureVerified Purchase
      It worked perfect, except it didnt seem to have a whole lot in it, don't know if it had dried up a little in shipping or storage, but it did work for the job that payed for it, just wish I would of had more to use on other jobs.
      Helpful
       Report
    • Victor E. Folk
      5.0 out of 5 stars It applied easily and seem to work well
      Reviewed in the United States on May 21, 2024
      Size: 6 mlStyle: Liquid - High StrengthVerified Purchase
      I needed a threadlock for a couple of small set screws going into aluminum on a mower cylinder head.

      This went one easily and dried well. I did not try to remove the small set screw after it dried because it is something that will never need to be removed,, so I cannot say how tightly it locked the set screw in place.

      A little bit goes a long way, so the small tube will last me pretty much forever.
      One person found this helpful
      Helpful
       Report
    • Suzanne B.
      5.0 out of 5 stars Reliable Threadlocker
      Reviewed in the United States on September 12, 2024
      Size: 10 mlStyle: Liquid - High TemperatureVerified Purchase
      It holds fasteners securely even under high heat. The 10 ml size is perfect for various projects, and it’s easy to apply. It has proven to be very effective in preventing loosening.
      Helpful
       Report
    • DESTROZATOR
      5.0 out of 5 stars Great product!! Thank you
      Reviewed in the United States on November 6, 2024
      Size: 10 mlStyle: Liquid - High TemperatureVerified Purchase
      Great product!! Thank you
      Helpful
       Report

    Top reviews from other countries

    Translate all reviews to English
    • あか
      5.0 out of 5 stars その通りです
      Reviewed in Japan on February 13, 2025
      Size: 6 mlStyle: Liquid - High StrengthVerified Purchase
      まあ、商品名の通りです。
      ただ、着色が赤で手につくと消えにくいです。
      Report
    • Doug P.
      5.0 out of 5 stars Useful product
      Reviewed in Canada on October 24, 2019
      Size: 6 mlStyle: Liquid - High StrengthVerified Purchase
      works well when used as intended and directed.
      Report
    • Amazon Customer
      5.0 out of 5 stars Good Value
      Reviewed in Canada on May 25, 2022
      Size: 36 mlStyle: Liquid - Permanent StrengthVerified Purchase
      Much better value than actual LOCTITE brand name. Does the same thing at a fraction of the cost of a bottle of LOCTITE brand.
      Report
    • Amazon カスタマー
      5.0 out of 5 stars 永久固定！
      Reviewed in Japan on April 17, 2025
      Size: 6 mlStyle: Liquid - High TemperatureVerified Purchase
      永久固定を謳っているようにガチガチに固まります。
      250℃で10分熱をかけ冷めないうちなら緩められます。
      Report
    • Mohd Ibrahim Ali
      5.0 out of 5 stars Excellent
      Reviewed in India on January 27, 2024
      Size: 5 mlStyle: Gel - High StrengthVerified Purchase
      Excellent product but expensive
      Report