Can this be used for screws on watch bracelets etc.? Thank you.

Yes, any fastener under 1/4". Blue lecture will work as well, but I prefer purple if the screw will need to come out in the future. If you don't ever plan on removing the screw, use red. I use purple on light duty fasteners such as RC airplanes/helicopters, small firearm components, etc.

Can this be used to lock nylon set screws in an 6061 aluminum bar?

I haven't used it in this application. I use it as a very low tension threadlocker on tiny screws..Have you tried Loctite blue threadlocker? Can you change out the nylon setscrews for brass or stainless steel ones? Those would be very lockable with any of the loctite products. The nylon is the problem since it distorts easily.

Does this Come with the Mil Spec certifications?

Only the bottle of Loctite is received. I would suspect that the certs can be downloaded from the Loctite web site.

Is this the one recomended by Rolex for the bracelet screws?

Yes, Rolex uses Loctite 222 for this purpose.

22221 Threadlocker 222ms Purple 10ml Volume

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Description

🔧 Lock it down with confidence—purple power for pro-level precision!

FASTENER FRIENDLY - Optimized for fasteners up to 1/4 inch diameter—perfect for detailed projects
DURABLE PERFORMANCE - Withstands extreme temps from -65°F to 300°F without losing grip
REMOVABLE WHEN NEEDED - Strong hold that’s still removable with tools—no permanent commitment
PRECISION CLAMP CONTROL - Controlled lubricity ensures exact clamp loads every time
QUICK APPLICATION WINDOW - 20-minute working time lets you move fast without sacrificing strength

Loctite 22221 Threadlocker 222MS is a purple, low-strength liquid adhesive designed for fasteners up to 1/4 inch diameter. It offers controlled lubricity for precise clamp loads, cures fully in 24 hours, and performs reliably across a wide temperature range (-65°F to 300°F). Water-resistant and removable with tools, it’s ideal for professional repairs requiring secure yet serviceable fastening.

Specifications

ASIN	B006GOL5CQ
Best Sellers Rank	#370,206 in Automotive ( See Top 100 in Automotive ) #131 in Thread Lock Sealers #5,544 in Oils & Fluids
Brand	Loctite
Brand Name	Loctite
Color	Purple
Compatible Material	Plastic
Container Type	Bottle
Customer Reviews	4.8 out of 5 stars 916 Reviews
Full Cure Time	24 Hours
Global Trade Identification Number	00079340222212
Included Components	Instruction guide included
Item Form	Liquid
Item Package Quantity	1
Item Weight	18.14 g
Manufacturer	Loctite
Material	Cyanoacrylate
Material Type	Cyanoacrylate
Model	22221
Number of Pieces	1
Part Number	22221
Specific Uses For Product	Repair
UPC	079340222212 640024983806
Viscosity Level	Low to Medium
Volume	10 Milliliters
Water Resistance Level	Water Resistant

Reviews

K**3

5.03.2018

C**.

21.04.2018

B**Y

18.08.2020

C**N

24.09.2023

P**R

6.06.2020

T**0

13.12.2015

R**R

23.02.2017

P**Y

14.07.2024

T**Y

17.08.2025

D**.

24.05.2021

R**1

29.06.2024

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