Why is this labeled as a primerless thread locker? Literally the first step on the package instructions is to prep your surface with a primer.

Loctite 263 is actually primerless on most metals. This is an automotive aftermarket package, and there is a Klean 'n' Primer product sold that is usually suggested for all anaerobic products. You can just clean the parts with alcohol or acetone. No primer is required. If you need further assistance, please contact the LOCTITE Technical team at 1-800-LOCTITE

Does Loctite 263 have a limited shelf life?

Yes, Loctite 263 threadlocker has a limited shelf life of 730 days from the date of manufacture. This means that it is important to check the expiration date on the product before using it. If the product is expired, it may not perform as expected.

Approximately how many 1/4" studs can be set with the 6m tube?

For small threads, we typically recommend applying 1 big drop (or 2 drops small/medium drop max) to the male threads at the engaging area, vs the female thread in the hole in a blind. The idea is to ensure a good coverage in the engaging/mating area of the nut and bolt. For 1/4" bolt, I estimate 200 bolts with a 6ml tube, of a manual application from the bottle.

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HEAVY DUTY RELIABILITY - Engineered for high shock, vibration, and chemical exposure—ideal for critical automotive and industrial fasteners.
RAPID PROJECT MOMENTUM - Starts setting in just 10 minutes so you can keep your workflow moving without delays.
UNIVERSAL METAL MASTERY - Works flawlessly on stainless steel, aluminum, and plated surfaces for unbeatable adhesion.
HEAT ACTIVATED FLEXIBILITY - Secure under extreme conditions yet easily removable with localized heat—no hassle, no damage.
PRECISION FIT FOR FASTENERS - Perfect for bolts up to 1 inch (25 mm), making it the go-to for professional-grade assembly.

Loctite 2203451 Threadlocker 263 is a high-strength, oil-tolerant adhesive designed for heavy-duty metal bonding. It sets quickly in 10 minutes and cures fully within 24 hours, providing a durable, temperature-resistant hold up to 140°F. Ideal for securing fasteners up to 1 inch in size, it withstands shock, vibration, and harsh chemicals while remaining removable with heat, making it a trusted choice for professional automotive and industrial maintenance.

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Brand	Loctite
Specific Uses For Product	Fleet and plant maintenance.
Material	Silicone
Item Form	Liquid
Special Feature	Strong
Colour	Red
Item Package Quantity	1
Package Information	Tube
Item Volume	6 Millilitres
Viscosity	Low
UPC	079340011649
Number of Pieces	1
Global Trade Identification Number	00079340011649
Manufacturer	Loctite
Model	Loctite 2203451 Threadlocker 263 Surface Insensitive-High Strength Tube, Red, 6-ml
Product Dimensions	12.7 x 5.08 x 2.54 cm; 0.28 g
Item model number	2203451
Manufacturer Part Number	2203451
Stain Resistant?	Yes
Assembly Required	No
Special Features	Strong
Country of Origin	USA
Item Weight	0.28 g

Loctite 2203451 Threadlocker 263 Surface Insensitive-High Strength Tube, Red, 6-ml

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