Box of straight pins, 36 sizes 4–24 mm, Ø 1 mm

This kit gathers 360 straight watch pins in 1.00 mm diameter, covering lengths from 4 – 24 mm. This box covers 21 different lengths spanning the 4 mm – 24 mm range, with approximately ≈10 units per length, for a total of 360 pieces. Straight pins are smooth cylindrical pins; they hold links of plastic, resin or specific OEM steel bracelets (Swatch, Flik Flak, junior pieces) where there is no knurling or split mechanism.

Product overview

Smooth straight pins do not lock by themselves — they rely on the tight interference fit of the link to stay in place. They are mostly used by Swatch on plastic-cased pieces, by Flik Flak on children's straps and by various low-cost branded watches whose links are pre-drilled to a very precise diameter. Replacing a straight pin therefore requires careful diameter matching with a digital calliper; a pin that is even 0.05 mm too small will not stay in service.

Technical specifications

• Component type: straight pin
• Diameter: 1.00 mm
• Length range: 4 – 24 mm
• Pieces per box: 360
• Material: stainless steel
• Finish: brushed / mirror polish on heads
• Storage: compartmented plastic case with hinged lid

• 4 mm
• 5 mm
• 6 mm
• 7 mm
• 8 mm
• 9 mm
• 10 mm
• 11 mm
• 12 mm
• 13 mm
• 14 mm
• 15 mm
• 16 mm
• 17 mm
• 18 mm
• 19 mm
• 20 mm
• 21 mm
• 22 mm
• 23 mm
• 24 mm

When to use it

Reach for this box whenever you notice that a bracelet or strap no longer holds firmly between the lugs, when the side play of a link has become visible, when a bracelet had to be resized in the past and the original pin was lost or bent, or simply when a customer brings in a watch whose retention component is missing. The 4 – 24 mm range covers virtually every adult wrist watch on the market and most ladies' references; it is comfortable for 18-, 19-, 20-, 21- and 22-mm lug widths, the four most common in the industry. Professional watchmakers will appreciate having every length on hand without re-ordering; enthusiasts will value the freedom to swap a strap for a fashion change without paying boutique prices for a single replacement pin.

How to use / install

1. Identify the link to be re-pinned and note the direction of the arrow stamped inside the link (knurled or split pins must be driven in the direction of the arrow).
2. Lock the bracelet into a bracelet holder, with the link sitting above the holder's slot.
3. Place the pin punch (Stiftaustreiber / botador / cacciaspine / pendrijver in the native terminology) on the pin tip and drive it out with the watchmaker's hammer using light, controlled taps.
4. Slide the new pin from this assortment into the link, knurled or split end first, and tap gently with the watchmaker's hammer until it sits flush with the outside face.
5. Inspect the joint visually and flex the link: if any play is felt, replace the pin with a fresh one of the same length.

Quality & origin

Each piece is machined from stainless steel (typically AISI 304L or 316L grades depending on the production batch), bright-finished and passivated to resist sweat and skincare residues. The spring bars feature hardened spring steel inside the body, with a calibrated spring rate that keeps the tips engaged even under the shocks of daily life. Knurled pins are work-hardened in the knurling zone so they hold their grip after several removals. Our boxes ship from European stock with a per-size visual control and a length tolerance kept within ±0.1 mm.

FAQ

How do I measure the right length?

With a digital calliper, measure the inside lug-to-lug width of your watch case, then subtract approximately 0.1–0.2 mm — that is the spring bar length you need. For pins driven into a steel bracelet, measure the existing pin or the width of the link from the outside.

Are these compatible with my Rolex / Omega / Tudor?

Yes for the diameter that matches your reference: 1.00 mm fits most Submariner-, Datejust-, Speedmaster- or Black Bay-style cases that use generic spring bars. For original Rolex / Omega service, the OEM-coded part may be required by warranty. These pieces are non-OEM but dimensionally compatible.

Can I reuse a pin after removing it?

A spring bar may be reused as long as its tips still spring freely and have not been chamfered by repeated tool marks. A watch pin of split or knurled type loses grip after one or two removals and should be replaced to avoid losing the link in service.