Menu

Reference

Mower blade center holes: round, star, bow-tie and H-pattern

Pick a center-hole shape to see how to measure it, the spindles and blade adapters it mounts to, the mowers that use it, and the blades made with that hole.

Choose your center hole to see the key facts and what fits. Each fact links to its source on the full page.

All blade center holes

  • Round center hole Round center holes are measured by inner diameter. Oregon's 96-347 has a 5/8 in hole and its 91-635 a 3/4 in hole, both 21-inch-class Gator G3 blades.
  • 5-point star center hole A 5-point star hole is identified by name. Craftsman's CMXGZAM110136 42-inch set and Oregon's 95-601 Gator G3 use it. What makers state and what they leave out.2 products that fit
  • 6-point star center hole Oregon says MTD-built blades with a 6-point star are replaced by its blades with a Y-shaped hole that fits the 6-point star on the spindle. Craftsman's one-blade set.
  • 7-point star center hole Oregon's 92-105 mulching blade has a 7-point star hole, is 17-1/16 in long, takes three blades per 48-inch cut and cross-references John Deere parts.
  • Bow-tie (H-pattern) center hole Bow-tie, also called H-pattern, is named rather than measured. Oregon replaces MTD-built bow-tie walk-behind blades with blades whose rectangular hole fits the adapter.
  • S-shape center hole Cub Cadet's 490-110-C202 and Craftsman's CMXGZAM110191 42-inch sets use an S-shape hole; Craftsman says it stops the blade going on upside down.