Treble Hook Weight Guide for Tuna Casting Lures | Match by Weight, Not Hook Size
About Hook Weight
A lure’s description may state that it is “○/0 compatible.” In reality, however, even hooks with the same size designation can vary greatly in weight depending on the brand and model.
For example, even within the same 5/0 size, a lightweight model and a heavy-duty reinforced model can differ by several grams or more. In fact, in the chart below, 5/0 ranges from about 8.8 g to about 18.7 g.
For this reason, rather than choosing a hook based on the “5/0 compatible” label alone, it is important to check three things: the brand name, the part number, and the actual weight. For lures that do not list detailed hook information, we recommend checking with the manufacturer before purchase.
Even when you attach a hook of the same size designation, the lure may sink more than expected, float too high, or change its action.
About Our Listings
Whenever possible, we list the following three values and publish the results of tests actually conducted with those specifications:
- Brand ○○ / Hook ○○ — ○○ g
- Brand ○○ / Hook ○○ + split ring — ○○ g
- Total weight when mounted front and rear — ○○ g
If the exact same hook is unavailable, please choose the closest product based on weight, not size.
Hook Weight Chart (4/0–7/0)
*Even within 4/0, the weight ranges from about 6.6 g to 12.6 g—nearly double. It is essential to match by weight, not by hook size. The 6/0 and 7/0 figures for the ST-76 will be updated once confirmed.
Split Ring Weight Chart
Split rings come in even more brands and standards than hooks, and many products do not publish their weight. Here we list the published figures from Owner, focusing on the size range used for large pelagics and tuna casting.
OWNER P-12 Split Ring Hyper Wire (general HPW class)
OWNER P-25 Split Ring Ultra Wire (super-reinforced)
*Even at the same #8, the P-12 (Hyper) weighs 0.67 g while the P-25 (Ultra) weighs 1.12 g—stronger rings are heavier. Since hooks are mounted front and rear, you use two rings, so even the same #8 creates a difference of about 0.9 g per set. Choose by strength, but stay mindful of the weight change.
How Hook & Ring Weight Changes the Action
A lure’s buoyancy and action change not only with the hook, but also with the weight of the split ring. If the total weight deviates significantly from the design or finished-prototype weight, the lure may not deliver its intended performance.
With lighter hooks and rings
- Higher floating posture
- Faster rise after a dive
- Larger action
- Better response to input
With heavier hooks and rings
- Lower floating posture
- Slower rise after a dive
- More subdued action
- In extreme cases, the lure becomes a sinker
By setting up not just by hook size but by weight, you can bring out the lure’s full intended performance.
In short: “○/0 compatible” is only a guideline. For both hooks and rings, matching by actual weight (grams)—not by the size label—is the shortcut to unlocking your lure’s true action.
