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🔧 Lock it down like a pro — don’t let your bolts bail on you!
LOCTITE 37421 271 Red Heavy Duty Threadlocker is a methacrylate-based adhesive trusted by automotive pros for securing large bolts and studs (≥1 inch). It bonds to all metals, tolerates minor oil contamination, resists shocks, vibrations, and chemicals, sets in 10 minutes, fully cures in 24 hours, and withstands temperatures up to 140°F. Ideal for demanding automotive and industrial applications requiring durable, reliable fastening.









| ASIN | B0028OJAIY |
| Best Sellers Rank | #7,424 in Automotive ( See Top 100 in Automotive ) #28 in Thread Lock Sealers |
| Brand Name | Loctite |
| Color | Red |
| Compatible Material | Aluminum, Stainless Steel |
| Container Type | Tube |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,083) |
| Full Cure Time | 24 Hours |
| Global Trade Identification Number | 00079340374218 |
| Included Components | (1) LOCTITE 271 Threadlocker for Automotive | Red, 6 ml Tube |
| Item Form | Tube |
| Item Package Quantity | 1 |
| Item Type Name | automotive-thread-lock-sealers |
| Item Weight | 4.54 g |
| Manufacturer | Loctite |
| Material Type | Methacrylate-based Resin |
| Model | 37421 |
| Number of Pieces | 1 |
| Other Special Features of the Product | Strong |
| Part Number | 37421 |
| Specific Uses For Product | Automotive, Industrial, DIY, Furniture, Heavy-Duty |
| UPC | 079340374218 |
| Viscosity Level | Low |
| Volume | 6 Milliliters |
| Water Resistance Level | Water Repellent |
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