Double Ring Date Mark Inserts
Mark both year and month simultaneously using independent inner and outer rotation rings — compact design fits standard counterbore dimensions.
Product
Double Ring Date Mark Pin Sets (Press-Fit)
Month 10/11/12 indication, press-fit installation.
View DetailsAre You on the Right Page?
✅ Double ring is right if:
- You need year AND month in a single compact insert
- Space is limited — cannot fit separate year and month inserts
- You prefer finger rotation (no tools needed for monthly update)
🔄 Consider switching to:
- Only need year OR month marking? → PL-Side Exchange or Plate-Side Exchange
- Need adjustable pin length for different mold depths? → L Adjustable
- Mold temperature >200°C? → Heat-Resistant
How the Double Ring Mechanism Works
The double ring insert consists of two concentric rings press-fit into a single housing:
- Inner ring (Year) — smaller diameter ring, engraved with year numbers (e.g., 24, 25, 26). Rotated annually.
- Outer ring (Month) — larger diameter ring, engraved with month numbers (1–12, with 10/11/12 indicated). Rotated monthly.
Both rings rotate independently using a pointed tool (DTPPN screwdriver or similar). An alignment arrow on the housing indicates the current setting. The press-fit retention prevents accidental rotation during molding cycles.
Minimum cavity diameter: Double ring inserts require a slightly larger counterbore than single-ring types — typically 10 mm minimum vs 8 mm for standard PL-side exchange.
Engineering note: The outer ring encodes the year, the inner ring encodes the month. Rotation is manual — ensure operators are trained on the correct rotation direction. For mechanism details, see our Double Ring Mechanism technical guide.
Application Scenarios
See how these products solve real engineering challenges across industries:
Automotive Year+Month Traceability
Under-hood and safety-critical automotive parts require both production year and month on every piece. The dual-ring mechanism marks complete dates with a single insert — no separate year and month pins needed.
Why it fits: The dual-ring mechanism encodes both year and month in a single Ø8–Ø12 mm insert footprint. Independent ring rotation means the month ring is updated monthly while the year ring changes only annually — reducing total annual changeover operations from 12 (separate pins) to just 1 for the year ring.
Medical Device Full-Date Lot Coding
Regulatory submissions (FDA 510(k), CE MDR) require full date codes for device history records. Double ring inserts provide tamper-evident, permanently molded date codes that survive sterilization.
Why it fits: Molded-in date codes cannot be altered post-production, providing tamper-evident traceability that printed or laser-marked labels cannot guarantee. The date impression depth (0.1–0.3 mm) survives autoclave sterilization (134°C, 18 min) and gamma irradiation without degradation.
Frequently Asked Questions
How does the double ring mechanism indicate both year and month simultaneously?+
What is the minimum cavity diameter needed to accommodate a double ring date mark insert?+
Can double ring date mark inserts be retrofit into molds originally designed for single-ring types?+
Engineering Resources
Need Double Ring Date Mark Inserts?
Specify your counterbore diameter and preferred year range.