Seiko Fatboy Style Heavy Duty Spring Bars – 2.5mm Ø / 1.10mm Pip

Heavy-duty 2.5mm Fatboy-style spring bars for compatible Seiko dive watches and other watches designed to use an extra-thick spring bar with a larger 1.10mm end pip.

Manufactured from stainless steel, these spring bars feature a double-shoulder telescopic design for straightforward fitting and removal, together with the substantial construction required by watches designed for heavy-duty spring bars.

Ideal as replacements for worn, damaged or missing spring bars, or when fitting a new compatible watch strap or bracelet.

Specifications

• Spring Bar Diameter: 2.50mm Ø

• End Pip Diameter: 1.10mm

• Type: Double Shoulder / Telescopic

• Style: Seiko Fatboy Style

• Material: Stainless Steel

• Construction: Extra Thick / Heavy Duty

• Available Widths: 18mm / 20mm / 22mm / 24mm

• Pack Sizes: 2 / 4 / 6 / 8 / 10 / 12 Pieces

• Colour: Silver

Compatibility

Compatible with many Seiko dive watch models and references designed to use this heavy-duty spring-bar specification, including:

Seiko 6309 • 7002 • SKX007 • SKX009 • SKX779 Monster • Turtle • BFK

Also suitable for other watches designed to accept a 2.50mm diameter spring bar with a 1.10mm end pip, provided the correct width is selected.

Important: Watch models and individual variants can use different spring-bar specifications. Please check your existing spring bar, lug width and lug-hole size before ordering. The 2.50mm body diameter and 1.10mm pip must be suitable for your particular watch case.

Extra Thick – Heavy Duty

At 2.50mm diameter, these Fatboy-style spring bars are substantially thicker than standard watch spring bars.

Their heavy-duty construction makes them particularly suitable for dive watches, sports watches and other substantial watch cases specifically designed to accept thicker spring bars.

The larger 1.10mm end pip provides a substantial engagement point with compatible lug holes, helping provide a secure connection between the watch case and strap or bracelet.

Double Shoulder / Telescopic Design

The double-shoulder construction provides an accessible point for a spring bar tool, helping with installation and removal.

The telescopic spring-loaded mechanism compresses during fitting before extending into the compatible lug holes.

Choose Your Size & Pack Quantity

Select your required Width and Pack Size from the options above.

Available Widths:

18mm • 20mm • 22mm • 24mm

Available Pack Sizes:

2 • 4 • 6 • 8 • 10 • 12 Pieces

Please measure the distance between your watch lugs and check the required spring-bar specification before ordering.

Why Choose Chrono Straps UK?

• UK Stock

• Fast Dispatch

• Quality Checked & Tested

• Heavy-Duty Stainless Steel Construction

• Multiple Width & Pack Options

• Specialist Watch Strap & Spring Bar Accessories

UK Stock – Fast Dispatch

Stocked and dispatched from the UK, helping you get the parts you need without waiting for international shipping.

Chrono Straps UK

Aftermarket replacement spring bars. Seiko and Seiko model names are trademarks of their respective owner and are used solely to describe compatibility/reference. These spring bars are not represented as genuine Seiko-manufactured parts.

Please check dimensions and compatibility with your individual watch before purchase.