From StrategyWiki, the free strategy guide and walkthrough wiki

[edit] Hit Combos and Critical Hit info

Each type of weapon comes with a hit combo or critical hit rate. This means that the hit combo or critical hit rate cannot co-exist on a weapon - it's one or the other!

Type of Weapon	Critical Hit Rate	Hit Combo Rate
Unarmed	N/A	5%
1-Handed Swords	N/A	5%
Daggers	N/A	7% The exception to this is the Danjuro, which has a 10% Hit Combo Rate.
Axes	N/A	3%
Maces	N/A	4%
Hammers	N/A	7%
Spears	N/A	4%
2-Handed Swords	N/A	7% There are several exceptions to this number, them being: The Dynast-King's Blade and the Treaty Blade, both with 25% The Tournesol, with 12% The Defender, with 5% The Wyrmhero Blade, with 80%
Katanas	N/A	13% The only exception to this is the Masamune, with 40%
Poles	N/A	12%
Ninja Swords	N/A	These all have different values, them being: Ashura; 15% Sakura-saezuri; 16% Kagenui; 17% Koga Blade; 18% Iga Blade; 19% Orochi; 20% Yagyu Darkblade; 22%
Handbombs	N/A	0%
Staves	N/A	0%
Rods	N/A	0%
Bows	5%	N/A
Crossbows	7%	N/A
Measures	5%	N/A
Guns	5%	N/A

[edit] Combo-Hits and HP

The rate of combo-hits change depending upon your percentage of HP. For example, you are less likely to deal a combo-hit when your HP is full, while you're more likely to deal a HP when you're at 25% of your max HP. Todo: Insert table, complete.