7 Best Loctite For Rifle Scopes of 2026 To Hold Zero Against Recoil

1

Loctite Threadlocker Blue 242 Nut/Bolt Locker

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.6
• Brand
  Loctite

Key specs2

Disassembly Requirement

Removable with standard hand tools

Fastener Protection

Locks threaded fasteners securely against vibration while sealing threads to prevent internal rust.

Pros & cons43

Pros

• Medium-strength bond prevents threaded fasteners from backing out under vibration
• Removable with standard hand tools when disassembling scope mounts
• Helps protect metal threads against rust and corrosion
• Blue anaerobic liquid formulation designed for general nut and bolt locking

Cons

• Bottle volume is not explicitly specified in fluid ounces or milliliters
• Cure time to initial set and full strength is unlisted on the packaging
• Requires verification of thread cleanliness before application

2

Loctite 222 Threadlocker for Automotive: High-Temperature, Low-Strength, Anaerobic, One-Piece Assembly,

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.6
• Brand
  Loctite

Key specs2

Fastener Sizing

Rated for fasteners under 1/4 inch (6 mm)

Cure Timeline

Begins setting within 20 minutes and achieves full bond strength in 24 hours.

Pros & cons42

Pros

• Low-strength formula specifically rated for small fasteners under 1/4 inch (6 mm)
• Disassembles easily with basic hand tools without stripping small screw heads
• Begins setting in 20 minutes with a full cure achieved within 24 hours
• Non-corrosive anaerobic liquid seals threads to prevent vibrational loosening

Cons

• Small 6 ml tube size covers fewer mounting projects than bulk workshop bottles
• Low holding strength is unsuited for heavy large-diameter mounting bolts

3

LOCTITE 242 Threadlocker for Automotive: High-Temp, Medium-Strength, Anaerobic | Red,

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.6
• Brand
  Loctite

Key specs2

Substrate Compatibility

• Compatible with aluminum scope mounts
• Bonds to stainless steel fasteners
• Works across plated metal surfaces

Cure Speed

5-minute set time; full strength at 24 hours

Pros & cons42

Pros

• Sets quickly in 5 minutes and reaches full cure strength after 24 hours
• Formulated to adhere to passive substrates including aluminum and stainless steel
• Medium strength prevents vibration loosening while permitting hand tool removal
• Compact 6 ml (0.2 oz) tube stores easily in range bags or tool kits

Cons

• Requires clean threads for proper cure since it lacks specialized oil tolerance
• 0.2 oz volume provides limited uses compared to 50 ml workshop bottles

4

Loctite 1329467 243 Blue Medium Strength Threadlockers, 1.69 Ounces, 50

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.4
• Brand
  Loctite

Key specs2

Surface Preparation

Cures on as-received oily fasteners

Volume Capacity

50 ml (1.69 oz) workshop bottle

Pros & cons42

Pros

• Oil-tolerant formulation cures reliably on as-received fasteners without degreasing
• Medium-strength holding power resists heavy recoil vibration
• Large 50 ml (1.69 oz) volume accommodates frequent optic swaps and multiple rifles
• Disassembles with hand tools without requiring heat application

Cons

• Features a distinct chemical odor during initial application
• 50 ml bottle is bulky to carry in a compact field range pack

5

Uncle Mike's Gun-Tite Glue Gun-TITE Glue Resealable Tube, Blister 16310,

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.2
• Brand
  Uncle Mike's

Key specs2

Mounting Application

Formulated specifically for firearms hardware, loose or worn screws, and rifle swivel bases.

Tube Design

6 ml resealable tube format

Pros & cons43

Pros

• Dedicated firearms formula designed to tighten loose or worn screws
• Specifically anchors rifle swivel bases and mounting hardware securely
• Resealable 6 ml tube prevents product dry-out between optic adjustments
• Backed by manufacturer replacement warranty for defective product

Cons

• Cure schedule and set times are not listed in the manufacturer specifications
• Formula strength level (low versus medium) is unstated on the packaging
• Substrate compatibility with aluminum versus steel requires user verification

6

Genuine Henkel Loctite 222 Threadlocking Adhesive - Low Strength -

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.2
• Brand
  Loctite

Key specs2

Ideal Hardware

• Countersunk head scope ring screws
• Small optical adjusting screws
• Fine-thread set screws

Removal Force

Low strength for easy hand-tool disassembly

Pros & cons42

Pros

• Low-strength holding profile protects delicate countersunk screws and small adjusters
• Large 50 ml workshop bottle supports ongoing maintenance across multiple firearm setups
• Allows effortless disassembly using hand tools without risk of rounding tiny sockets
• Compatible with all metal threaded assemblies across scope rings and bases

Cons

• Low holding force is not intended for high-stress rail bolts requiring medium torque
• Specific cure duration and set times are not stated in product specifications

7

Loctite 242 Threadlocker - Blue Liquid 1.69oz Bottle

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.2
• Brand
  Loctite

Key specs2

Dispensing Options

• Direct droplet application
• Brushing onto ring screw threads
• Dipping fastener tips

Moisture Resistance

Waterproof anaerobic bond

Pros & cons43

Pros

• Versatile adhesion across common mount metals including aluminum, steel, and brass
• Fast-drying liquid formula cures cleanly to prevent loosening under recoil shock
• Waterproof bond holds up even under wet weather or submerged conditions
• Flexible application methods support dipping, brushing, or direct droplet dispensing

Cons

• Packaging notes high strength bonding, requiring careful torque on tiny ring screws
• Requires hand tools with precise fit to prevent stripping during disassembly
• Exact setting duration in minutes is not stated in the product details

Last update on 2026-09-26 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Should you use blue or purple Loctite on rifle scope rings?

Purple low-strength formulas like Loctite 222 are designed specifically for fasteners under 1/4 inch (6 mm) that may require occasional adjustments. Because scope ring screws are small, low-strength purple threadlocker provides reliable adhesion while offering easy disassembly with standard hand tools. Blue medium-strength formulas like Loctite 242 also protect threads against vibration and work on all metals, but their stronger hold can make small ring screws harder to remove safely.

Will medium-strength blue threadlocker strip small optic screws during removal?

Medium-strength blue threadlocker can increase the risk of stripping when used on small screws with shallow driver sockets. Formulations like Loctite 242 provide firm medium strength for standard nut and bolt applications. When mounting rings with fasteners under 1/4 inch (6 mm), low-strength purple Loctite 222 prevents loosening on vibrating assemblies while ensuring easy disassembly without requiring heavy force.

Can you apply threadlocker to aluminum scope mounts and rails?

Yes, medium-strength threadlockers like Loctite 242 work on all metals, including passive substrates like aluminum, stainless steel, and plated surfaces. This makes them suitable for securing steel or aluminum mount screws to aluminum receiver rails. For exact base screw torque limits across different metal pairings, always verify the manufacturer guidelines for your rings and bases.

How quickly does scope threadlocker dry and cure before shooting?

Liquid formulas like Loctite 242 dry quickly, allowing for fast application and curing across metal threads. Because full curing times depend on surrounding temperature and the specific metals involved, verify the recommended schedule on the packaging before taking your rifle out. Giving the compound enough time to set protects your assembly from recoil shock when shooting a high-magnification setup like an Athlon Optics Talos optic.

Does threadlocker protect rifle scope screws against moisture and rust?

Liquid threadlockers like Loctite 242 are waterproof and can even be used underwater up to a certain depth, while protecting threads from corrosion. Anaerobic adhesives like Loctite 222 are non-corrosive, locking and sealing the assembly against moisture. If you are restoring older mounting hardware that has worn threads, options like Uncle Mike's Gun-Tite work specifically to tighten loose or worn screws.

What is the best threadlocker choice for high-recoil rifles and airguns?

Low-strength purple Loctite 222 prevents loosening on vibrating assemblies while maintaining easy disassembly for ring screws under 1/4 inch (6 mm). For larger base bolts connecting rails to receivers, medium-strength Loctite 242 protects threads and provides dependable holding power on all metal threaded assemblies. Matching the strength to your screw size helps maintain your zero against recoil whether shooting centerfire rifles or mounting a close-range pesting air rifle scope.