Sai — 釵 (Metal Trident)
The sai (釵) is a metal weapon consisting of a central shaft with two curved side tines (yoku). Practiced in pairs or as a set of three (two held, one thrown), the sai is the second most kata-rich weapon in the Taira curriculum, with eight kata attributed to the lineage.
Physical Characteristics
| Property | Detail |
|---|---|
| Length | ~45–55 cm total |
| Central shaft | Octagonal or round metal rod |
| Side tines | Curved upward, used to trap opponent's weapon |
| Weight | ~550–700 g each |
Use and Strategy
The sai's primary tactical function is the trap-and-counter: the tines can catch a bō or blade, immobilize it, and create an opening for a central-shaft thrust or strike. The weapon can also be flipped (kaeshi) in the hand to use the handle end for close-range strikes.
The three-sai practice reflects a traditional use where one is thrown to distract or injure while retaining two for close combat.
Kata Families
The Taira line preserves eight sai kata organized in three family clusters — see Sai Kata for the full structural analysis:
Hamahiga family: Hamahiga no Sai → Hamagotenyaka no Sai, Hantagwa no Sai
Tsuken–Chatan–Tawada family: Tsuken Shitahaku no Sai, Chatan Yara no Sai, Tawada no Sai
Kochijo–Jigen pair: Kochijo no Sai ↔ Jigen no Sai
The Manji-Sai
The Jigen no Sai kata is performed with the manji-sai (卍釵) — a variant where the side tines curve in opposite directions (one up, one down). This variant was Taira Shinken's own creation for the Jigen kata. The asymmetric tines create distinct trapping and blocking options compared to standard sai.