Replacement 17mm Spring Bars for Rolex Datejust 31 mm  Stainless steel Midsize Junior No Holes Case. 

- Set of 2

Compatible replacement for Rolex part no. B23-40160

17mm x 1.8mm Thickness made from 316L Stainless Steel 

This Spring Bar is for Rolex Datejust 31mm with No holes case. References 

178383 | 78080 278275 | 78240 67480  | 78274 68240  | 68274  | 177200 | 178271

177210 | 178273 177234 | 178274 178240 | 178313 178241 | 178341 178384 | 178343

| 178344

The Spring Bars you will receive is exact like the pictures. 

these precision spring bars are manufactured to match original factory dimensions and performance.

Available Finishes

• Stainless Steel

Factory Correct Fit for Rolex 

Designed exclusively for early Rolex cases with factory accurate dimensions and tolerances.

Swiss Standard Construction

Manufactured from high grade Swiss standard 316 stainless steel for maximum durability and corrosion resistance.

Precision machined

Engineered for long term elasticity

Built for professional installation

Designed for daily wear

Factory Level Tension and Performance

Each spring bar is tested to ensure consistent compression and secure locking inside the lugs.

No weak springs

No loose tolerances

No deformation over time

Maintains correct tension even after repeated bracelet or strap changes.

Precision Design for Vintage Installation

Optimized for Oyster bracelets and leather straps used on sports models.

Correct shoulder placement

Secure seating inside the lug holes

Authentic installation feel

Platinum Grade Yellow Gold Finish

Our yellow gold color spring bars are finished using professional grade PVD coating engineered for long term durability and color stability.

Strong molecular bond to steel

Exceptional resistance to wear and fading

Designed for frequent strap changes

Maintains original tone and brilliance

 

This product is not manufactured by Rolex SA and is not an official Rolex component. Rolex is a registered trademark of Rolex SA.