d - 4 mm

D - 9 mm

B - 2,5 mm

C - 2,5 mm

r min. - 0,15 mm

r1 min. - 0,15 mm

da min. - 5,2 mm

Da max. - 7,8 mm

ra max. - 0,1 mm

Weight - 0,0006 Kg

Basic dynamic load rating (C) - 0,64 kN

Basic static load rating (C0) - 0,23 kN

(Grease) Lubrication Speed - 59000 r/min

(Oil) Lubrication Speed - 70000 r/min

Calculation factor (f0) - 12,8

• Model Number:684
• Inner Diameter：4mm Outer Diameter：9mm Width：2,5mm
• Type：Deep Groove Ball Bearings
• Update date：2025-12-17
• Application:Gas turbine,Logistics Equipment,crimping tools,EEG,medical equipment,shaft milling machine,Industrial,diagnostic test paper,milling head plug,surgical instruments,lathe
• Similar models:ISO F684ZZ ZEN SF684-2RS ZEN SF684-2Z NTN W684ASSA ISB 684 CYSD 6848-RZ CYSD 6844-ZZ FBJ F684ZZ CYSD 6840-RS CYSD 6844-RS
• BEARING POWER International Trading Co.,Ltd. specialize in 684 products，there is large inventory of KOYO 684 . We has been built up long-term cooperation with KOYO company, could make a bulk order of the 684 Which KOYO 684 is the most authentic, must choose BEARING POWER, what a whole variety, reasonable price, guaranteed quality, prompt delivery via Global express.Any inquiry, never hesitate to E-mail or call +86-022-58519721 to contact us.

• Model No.	Inner Diameter	Outer Diameter	Width	Brand	Type
  1201	12	32	10	NSK	Self-Aligning Ball Bearings
  15123/15251D+X1S-15123	31.75	63,5	44,259	Timken	Tapered Roller Bearings
  16092	460	680	71	CX	Deep Groove Ball Bearings
  21307 EKW33+H307	30	80	21	ISB	Spherical Roller Bearings
  22314 MAW33	70	150	51	MPZ	Spherical Roller Bearings
  2315K	75	160	55	KOYO	Self-Aligning Ball Bearings
  6028DDU	140	210	33	NSK	Deep Groove Ball Bearings
  6228ZZ	140,000	250,000	42,000	NTN	Deep Groove Ball Bearings
  71926 CTBP4	130	180	24	CX	Angular Contact Ball Bearings
  BD1B 351890 A	1380	1540	130	ISB	Thrust Ball Bearings
  GT44	88,9	132,563	25,4	INA	Thrust Ball Bearings
  G1104KRRB	31.75	72	37,7	Timken	Deep Groove Ball Bearings
  GE 50 DO	50	75	35	INA	Plain Bearings
  NAG 4901	12	24	13	IKO	Cylindrical Roller Bearings
  NJ322-E-MPA	110	240	50	NKE	Cylindrical Roller Bearings
  TUP2 45.45	45	50		CX	Plain Bearings
  UCHA208	40		49,2	FYH	Bearing Units
  HM-3084+MS-3084	12	Tr 420x5	32	SKF	LOCKNUTS COMPLETE WITH LOCKING CLAMP
  SDAF-617	2.9375			Torrington	PILLOW BLOCKS
  639	9	30	10	CONSOLIDATED	DEEP GROOVE BALL BEARINGS