Hillman Zinc-Plated Hex-Head Lag Screws Review (2026)
By The DIYPicks Team · Updated July 2026
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4.6$12~$8–$15 per pack by size; e.g. 1/4 in. x 3-1/2 in. 100-pk ~$30, small packs ~$5Check Price on Amazon →
- Heavy into wood
- Into studs
- Ledgers brackets
The workhorse for pulling heavy things tight to studs and joists. Match diameter and length to the load, always drill a pilot hole, and step up to galvanized for anything outdoors.
Pros
- Coarse threads bite deep into wood for serious holding power — the right pick for TV brackets, ledgers and heavy shelving into studs
- Hex head lets you apply high torque with a socket without cam-out
- Sold loose by exact diameter and length, so you buy only what the job needs
Cons
- Almost always needs a pre-drilled pilot hole — skip it and you'll split the wood or snap the screw
- Zinc plating isn't for outdoor/pressure-treated lumber (use hot-dip galvanized or stainless there)
- Requires a wrench or socket — no quick driving with a bare drill bit
Specifications
| Type | Hex-head lag screw (lag bolt) |
|---|---|
| Sizes | 1/4 in., 5/16 in., 3/8 in. dia; 1-1/2 in. to 8 in. long |
| Drive | External hex head (wrench/socket) |
| Material | Zinc-plated steel |
| Best for | Heavy fastening into wood studs & joists |