Generic Cartier Case Back Screw For 42mm Ballon Bleu (8 pcs)

Quantity	Discount (%)	Price
1 - 2	—	$15.00
3 - 4	5 %	$14.25
5 - 9	7 %	$13.95
10 - 14	10 %	$13.50
15+	15 %	$12.75

Quantity

Discount (%)

Price

1 - 2

—

$15.00

3 - 4

5 %

$14.25

5 - 9

7 %

$13.95

10 - 14

10 %

$13.50

15+

15 %

$12.75

Product Description

This is a set of 8 generic case back screws for the Cartier Ballon Bleu 42mm watches, measuring 3.0mm (diameter) × 1.0mm (thread length) with a screw head diameter of 1.35mm. They are compatible with calibers 3003, 3284, 3754 and other automatic movements housed in the 42mm Ballon Bleu case (references such as W69012Z4, W69016Z4). The screw‑down case back of the Ballon Bleu relies on multiple fine screws.

With repeated opening or aging, the cross‑slots may wear, threads may strip, or screws may be lost. This set of 8 aftermarket screws offers watchmakers a cost‑effective and reliable solution to securely close the case back and restore the original 100m water resistance.

Features & Function

Material & Finish: High‑quality stainless steel (316L), polished – corrosion‑resistant and durable.

Dimensions: Screw overall length 3.0mm, threaded section length 1.0mm, head diameter 1.35mm. Cross‑slot (Phillips) or flathead (depending on batch) compatible with original Cartier case back threads.

Compatible Models: Cartier Ballon Bleu 42mm case references including but not limited to: W69012Z4 (steel), W69016Z4 (two‑tone), W6920085 (rose gold).

Compatible Movements: Cartier Caliber 3003 (based on ETA 2892‑A2), 3284 (automatic), 3754, etc.

Quantity: Set of 8 screws – enough to replace all screws securing a 42mm Ballon Bleu case back (which typically uses 8 screws).

Function: Secure the screw‑down case back to the middle case, compressing the gasket to achieve 100m water resistance.

Important Notes

⚠️ Screwdriver Selection Critical: Use only a PH000 (or at least PH00) precision Phillips screwdriver. An oversized bit will damage the cross‑slot; an undersized bit will slip and ruin the recess. Bergeon or Wiha tools are recommended.

⚠️ Threadlocker Type: Use only low‑strength (purple) Loctite 222. High‑strength threadlocker will make future removal impossible without damaging the screw or case threads.

⚠️ No Overtightening: The O‑ring provides the water seal – the screws only need to hold the case back without looseness. Overtightening will snap the screw head or strip the case threads.

⚠️ Water Resistance: After replacing screws, always perform a professional pressure test (3–5 bar).

⚠️ Length Confirmation: The threaded length for the 42mm Ballon Bleu is 1.0mm. A longer screw may bottom out or damage the movement.

FAQ

Q1: I lost only one screw. Can I buy a single screw?
A: This product is sold as a set of 8, not individually. However, you can keep the remaining 7 as spares. Genuine Cartier screws are also supplied in batches; single screws are difficult to source.

Q2: After installation, the watch fails the water resistance test (bubbles from the case back edge). Are the screws faulty?
A: Not necessarily. Water failure most often results from a worn or missing O‑ring, lack of silicone grease, or uneven tightening. Inspect the gasket, apply fresh grease, and tighten the screws evenly in a star pattern.

Q3: Can I skip using threadlocker?
A: Strongly not recommended. The screws are subject to vibration during wear. Without threadlocker, they can slowly back out, causing the case back to loosen and water ingress. Low‑strength threadlocker prevents loosening while remaining removable.