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Vibra-Tite VC-3 Threadmate is a liquid threadlocker that cures to form a flexible, rubber-like film on fastener threads. Unlike conventional anaerobic threadlockers (such as LOCTITE® blue or red), VC-3 is adjustable and reusable — the fastener can be repositioned after installation and re-tightened without reapplication, making it ideal for applications requiring periodic adjustment or maintenance.
VC-3 Red is a medium-to-high strength variant in the VC-3 product family, suitable for fasteners up to M20 / 3/4" diameter. It is widely used in automotive, industrial, and defense applications.
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Key Product Characteristics
| Property | Description |
|---|---|
| Type | Liquid threadlocker (brush-on or dip application) |
| Cure mechanism | Air-dry film (not anaerobic); cures on exposure to air |
| Cured film character | Flexible, rubber-like; vibration-resistant |
| Adjustability | Adjustable after installation — fastener can be repositioned |
| Reusability | Reusable — locking function retained through multiple installation cycles |
| Substrate compatibility | All metals; active on both active and passive (plated/coated) surfaces |
| Color (VC-3 Red) | Red |
| Container size | 250 mL (shown) |
VC-3 vs Conventional Anaerobic Threadlockers
| Feature | Vibra-Tite VC-3 | Conventional Anaerobic (e.g., LOCTITE 243/271) |
|---|---|---|
| Cure mechanism | Air-dry film | Anaerobic (cures in absence of air, activated by metal ions) |
| Adjustable after installation | Yes | No (fully cured = permanent or semi-permanent) |
| Reusable | Yes (multiple cycles) | No (single use) |
| Active on passive surfaces | Yes (plated, coated, stainless) | Often requires activator on passive surfaces |
| Pre-application possible | Yes (apply and let dry; activate on assembly) | Limited (liquid must be applied at assembly) |
| Vibration resistance | Good (flexible film) | Good to excellent (rigid cure) |
| Removal | Standard hand tools | May require heat or impact tools |
US Military Certifications
VC-3 Threadmate meets the requirements of multiple US military branches and procurement specifications, confirming its suitability for defense, aerospace, and mission-critical applications:
| Branch / Agency | Specification / Part Number | Notes |
|---|---|---|
| US Air Force | Stock No. 19207 (MIL-PRF-19207 series) | Aerospace sealing and fastener requirements |
| US Army Missile Command | MIS-28867A and P5407-1 | Two procurement / performance specifications |
| US Army Tank-Automotive Command (TACOM) | Part No. 11663357 | General dynamics / ground vehicle applications |
| US Navy Naval Sea Systems Command (NAVSEA) | Part No. 5174855 | Naval procurement / certification number |
| NATO Stock Number (NSN) | 8030-00-163-5792 | Unique NATO supply chain identifier; enables direct product traceability |
The NATO Stock Number (NSN) 8030-00-163-5792 is the product’s unique identifier in the US military and NATO supply chain, enabling direct sourcing and traceability across all branches.
Applications
- Automotive and powertrain: Fasteners requiring periodic adjustment or torque verification without full disassembly
- Defense and aerospace: MIL-spec compliant locking for aircraft, missile, and ground vehicle fasteners
- Industrial machinery: Vibration-resistant locking on equipment subject to maintenance cycles
- Plated and coated fasteners: Effective on zinc-plated, black oxide, Dacromet, and stainless steel fasteners without activator
- Pre-application at manufacturing: Apply VC-3 to fasteners at the factory; the dried film activates when the fastener is tightened at the assembly point
Application Instructions
- Clean fastener threads to remove oil, grease, and contamination
- Apply VC-3 to the male thread (bolt/screw) by brush, dip, or spray
- Allow to air-dry completely before assembly (typically 15–30 minutes at room temperature)
- Assemble and tighten to specified torque
- For reuse: loosen, reposition, and re-tighten — no reapplication required for the first several cycles
Related Guides
- LOCTITE DRI 2045 Pre-Applied Thread Locker — 220°C Heat Resistance
- Why Stainless Steel Fasteners Seize (Galling) — Prevention and Solutions
- Hydrogen Embrittlement in Fasteners
- Bolt Breaking Torque Reference Tables
Content authorized for publication by FULLERKREG.