1 / 3Hillman 230057 Zinc Hex-Head Lag Screws, 5/16 x 3 in, 100-Pack
Pack: Hillman 230057 zinc hex-head lag screws are listed in a 5/16 x 3-inch size and 100-piece quantity. Their hex heads are intended for wrench or socket driving, while the listing describes coarse threads for snug connections in wood and masonry applications when used with a lag shield.
At a glance
- Hex head is designed for driving with a wrench or socket.
- The listing describes coarse threads for pulling wood joints tight.
- Listed for wood fastening and masonry use with a lag shield.
- Zinc-plated steel is described as offering moderate corrosion protection for indoor and covered outdoor use.
Reference price: $35.55
Price checked: Nov 14, 2026
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Pros and cons
Pros
- A 100-piece listed quantity suits projects that need multiple fasteners.
- Hex drive offers a wrench or socket option instead of a screwdriver.
- The product listing identifies uses including framing, decks and fences.
Cons
- Zinc plating is described as providing moderate protection, with covered outdoor applications specified rather than unrestricted exposure.
Technical specifications
17 specifications| Brand | Hillman |
|---|---|
| Model | 230057 |
| Fastener type | Lag Screw |
| Pack quantity | 100 |
| Listed size | 5/16" x 3" |
| Dimensions listed | 5.4 x 4.4 x 3.4 inches |
|---|---|
| Weight listed | 5.3 pounds |
| Thread size | 5/16" |
| Thread coverage | Partially Threaded |
| Thread type | Unified National Coarse (UNC) |
| Thread direction | Right Hand |
| Thread class | 1A |
| Drive system | External Hex |
| Head style | Hex |
| Point style | Sharp |
| Item diameter | 0.31 inches |
| Material listed | Zinc |
|---|
What to know before buying
- For masonry, the listing says to use a lag shield. It also recommends pre-drilling a pilot hole, and describes a washer under the head as useful for a strong result. The stated corrosion protection is moderate and framed for indoor use or covered outdoor jobs.
What’s in the box
Included- 100 zinc hex lag screws
Who is it for?
A good fit for
- Wood framing, fence and deck projects needing 5/16-inch by 3-inch lag screws.
- Buyers who prefer an external hex head driven with a wrench or socket.
- Projects using masonry anchors with a separate lag shield.
Less suited to
- Applications requiring confirmed corrosion protection beyond the listing's moderate, covered-outdoor-use claim.
- Projects that need a size other than the listed 5/16-inch by 3-inch fastener.
Customer reviews on Amazon
- 5 stars
68% 68% - 4 stars
12% 12% - 3 stars
6% 6% - 2 stars
5% 5% - 1 star
9% 9%
The available aggregate ratings lean positive overall, but include ratings across the full star range. Without customer comments, they do not establish what buyers liked or disliked, or whether the fasteners performed well in any particular application. Use the stated size, zinc finish and installation conditions to judge suitability for your project.
Frequently asked questions
What size are these Hillman lag screws?
The listing gives the size as 5/16 inches by 3 inches.
How is the hex head driven?
The listing describes using a wrench or socket. It also mentions an impact driver as a driving option.
Can these screws be used in masonry?
The listing says masonry applications require a lag shield. It does not describe the screw as fastening directly into masonry without one.
What corrosion protection is stated?
The product description characterizes the zinc plating as moderate protection and describes indoor and covered outdoor use.
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