Heavy Duty Spring Bars (2.5mm diameter & 1.1mm pip)


Double shoulder 20mm or 22mm wide (from case shoulders) high quality, heavy duty, 2.5mm thick spring bars. The width of a spring bar is the width when the bar is approximately 95% compressed – providing maximum strength when installed. The significant feature of these spring bars is their FAT pip / pivot. The pip on these bars is 1.1mm (most spring bars are 0.8mm). These spring bars are normally installed on outdoor adventure watches and dive watches – in particular Seiko dive watches.



When we started ChronoDivers website we realised there were some products that enthusiasts simply couldn’t find. One such item was the Spring Bars for the Seiko SKX009 and SKX007 dive watches. These spring bars have a 2.5mm external diameter and significantly a 1.1mm pip / pivot point at the end. These HEAVY DUTY spring bars – oftern referred to as Seiko FATBOY bars – are available in both 20mm and 22mm widths. The 22mm version has precisely the same dimensions as the Seiko C220FS (please note these are NO genuine Seiko parts – but quality alternatives)

1 x item added to cart = a PAIR (two spring bars)

  • 20mm or 22mm (to fit lugs of this width)
  • 2.5mm external diameter (thickness)
  • 1.1mm pip – for extra secure fixing to the case
  • Double colour
  • Extra thick – perfect for divers watches
  • Stainless Steel


Additional information

Width (lug to lug)

20mm, 22mm


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