Questions
Frequently asked
The stuff people ask before they buy. Don't see yours? Reach out — we answer fast.
The kit repairs stripped or damaged threads in aluminum blocks — spark-plug holes, head-bolt holes, drain plugs and similar. Pick the repair type / thread size that matches your application on the product page. If you're unsure, email us your engine and the hole you're fixing and we'll confirm before you buy.
Dealer- and brand-specific kits carry a big markup and are often sold through restricted channels. We sell the same class of repair — tap, depth-stopped drill, hardened sleeves and install tool — direct, with no dealer in the middle.
Stronger. The hardened steel sleeve has a higher load rating than the surrounding aluminum, which is why insert repairs are standard practice in professional engine shops.
You can't. The drill bit ships with a pre-set depth stop that bottoms out at the correct depth, so the single most expensive mistake — punching too far into the block — is off the table.
Unused kits in original packaging can be returned within 30 days. Because the sleeves and tap are consumable cutting tools, used kits aren't returnable. See Shipping & Returns for details.
In-stock kits ship within 1–2 business days with free shipping in the lower 48. You'll get tracking by email as soon as it's on the truck.
Have a sizing or compatibility question? Contact us or email support@threadsleeve.com.