6405 bearing: 25 × 80 × 21 mm

A 6405 is a deep groove ball bearing, 25 mm bore, 80 mm outside diameter, 21 mm wide. Variants: 6405-2RS (rubber sealed), 6405-ZZ (metal shields), 6405 open.

Bore	25 mm
Outside diameter (OD)	80 mm
Width	21 mm

Sizes from maker catalogues. No sourced load ratings for this one yet, so none are shown.

Open 6405 in Benchsmith Add to order list

What the number means

`6`	Deep groove ball bearing
`4`	Heavy series
`05`	Bore 05 × 5 = 25 mm

Ask for

6405-2RS: rubber sealed both sides. Other brands: SKF 6405-2RSH, FAG 6405-2RSR, NSK 6405DDU, NTN 6405LLU, Koyo 6405-2RS.
6405-ZZ: metal shields both sides. Other brands: SKF 6405-2Z, FAG 6405-2ZR, NSK 6405ZZ, NTN 6405ZZ, Koyo 6405ZZ.
6405: open, no seals or shields.

Add C3 for electric motors and anything that runs hot.

Same bore, different size

680525 × 37 × 7
690525 × 42 × 9
1600525 × 47 × 8
600525 × 47 × 12
620525 × 52 × 15
630525 × 62 × 17

One size up or down

640420 × 72 × 19 (down)
640630 × 90 × 23 (up)

Every bearing 25 × 80 × 21 mm: 25 × 80 × 21 mm bearings. Measured a bearing with no number on it? Type the bore, OD and width into Benchsmith → Find → Bearing.