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LOCTITE506166 All-Purpose Medium Strength Anaerobic Threadlocker Stick, Blue, 9-Gram

LOCTITE506166 All-Purpose Medium Strength Anaerobic Threadlocker Stick, Blue, 9-Gram

Q: Does the stick ever dry out? What is the longest you have had it open and it still works as expected for you?

Loctite Rep said the "stick" shelf life from date of manufacture is 4 years. Rep said Manufacture date is 2nd and 3rd series of numbers/ letters in the batch number. Example Batch Number example L3 7 B AC569. Number 7 will indicate last number of the year No clarification was given if 2017 would be 7 or 17. And and letter B will indicate month, B = February.

Q: INeed to remove the bolt, can you do it with tools? Liquid says yes, reviewers say stick is permanent. Can't be permanent for my purpose .

loctite says: Threadlocker Blue 242® is great for Securing nuts and bolts from accidental loosening. Removes with hand tools.I say: It depends. Size of the locking area, strength and condition of the fastener. Now on a typical 5/16'' nut and bolt is a very small locking area so Blue is totally removeable as long as it's clean with no rust or burrs. Got dirt, rust, wire brush em unless their too far gone. Chase the threads on burrs. If you don't and it's a cheap grade fastener... It's gonna break and may ruin your day. Remember, this stuff turns into a crystalline structure under pressure. Sticks to everything including dirt and rust. So the impregnated rust, dirt and burrs are bigger now which causes binding upon removal. The LOCTITE 290 Wicking Grade Green is kool stuff. Apply after assembly and doesn't take much. Almost as strong as Blue, easy removal qualities and costs more. So don't spill it. Threadlocker Red 271 is for grade 8 fasteners or better. Hope this helped.

Q: Has anyone used this with macbook screws? i'm hoping it provides similar holding power to oem screws, mine have been wiggling out a lot over time.

Yes. I use this on all of my computer screws, including an older MacBook. I'm not aware of anything special about MacBook screws, or oem screws, that would make them less suitable. This is a mechanical bond, so the more threads that engage, and the finer the gap of the engagement, the better it works.

Q: Is there a max temperature for storage? Basically will it melt in my Florida garage?

Optimal storage is 8 °C to 21 °C. Storage below 8 °C or greater than 28 °C can adversely affect product properties. Here is the TDS: http://tds.henkel.com/tds5/Studio/ShowPDF?pid=248&format=MTR&subformat=REAC&language=EN&plant=WERCS

4.8/5

Product ID: 254741923

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Details

Brand
LOCTITE
Specific uses for product
Repair
Material
Aluminum Steel
Compatible material
Stainless
Item form
Stick

🔧Medium strength locking power

🕒Applies ahead of assembly time

🛠️Removable with hand tools

Frequently Bought Together

Loctite 37643 Blue Medium Strength Threadlocker Stick - 9 g

Loctite 37701 Red High Strength Threadlocker Stick - 9 g

Loctite 1329467 243 Blue Medium Strength Threadlockers, 1.69 Ounces, 50 mL, 3/4" Thread

Description

🔩 Secure your build with confidence—Loctite locks it down, so you don’t have to.

OVERHEAD FRIENDLY - Ideal for tough-to-reach repairs and elevated applications
LOCK IT FORGET IT - Medium strength formula secures bolts without overkill
TOOL FRIENDLY REMOVAL - Disassembles easily with standard hand tools—no damage, no hassle
OEM TRUSTED PERFORMANCE - Used by automotive factories for reliable, stress-resistant fastening
PREP NOW ASSEMBLE LATER - Wax-like stick lets you apply in advance for streamlined workflows

Loctite 506166 is a medium strength anaerobic threadlocker in a convenient wax-stick applicator, designed for versatile use on automotive bolts and studs. It enables pre-application before assembly, excels in difficult or overhead repairs, and is removable with hand tools. Trusted by OEMs, it fills thread gaps to create secure, vibration-resistant fastenings ideal for professional-grade maintenance and assembly.

Specifications

Manufacturer	Loctite
Brand	LOCTITE
Model	Loctite
Product Dimensions	8.89 x 1.91 x 1.91 cm; 27.22 g
Item model number	37643
Exterior	Smooth
Manufacturer Part Number	506166
OEM Part Number	37643
Special Features	Strong
Item Weight	27.2 g
Viscosity	[AI] Medium

Have a Question? See What Others Asked

Does the stick ever dry out? What is the longest you have had it open and it still works as expected for you?

INeed to remove the bolt, can you do it with tools? Liquid says yes, reviewers say stick is permanent. Can't be permanent for my purpose .

Has anyone used this with macbook screws? i'm hoping it provides similar holding power to oem screws, mine have been wiggling out a lot over time.

Is there a max temperature for storage? Basically will it melt in my Florida garage?

Common Questions

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TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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