Name: CISA Astral Tekno PRO 40/55 double cylinder with clutch (10M3T142012)
Brand: CISA

CISA 10M3T142012 — Official series illustration, not a photo of this exact size variant; consult model specifications. — Official series illustration, not a photo of this exact size variant; consult model specifications.Image source

10M3T142012 dimension diagram: side B 54.5 mm, side A 39.5 mm, overall body length 94 mm — Our dimension diagram follows the corresponding catalogue row; it is not a product view or machining template; the projecting knob shaft is excluded from body dimension L.

Cylinder dimensions

Dimensions from model documentation
Specifications	Dimensions from model documentation
Dimension A	39.5 mm
Dimension B	54.5 mm
Overall length L	94 mm

Measure both sides from the fixing screw. Check the cylinder profile, cam and version.

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Specifications

Key system: Astral Tekno PRO
Construction: Double cylinder with clutch
Nominal size: 40/55
Dimension A: 39.5 mm
Dimension B: 54.5 mm
Overall length L: 94 mm
Coding construction: 10-pin-position coding system
Body construction: Brass body with controlled-break cuts
Key type: Reversible nickel-plated brass flat key
Operating mechanism: DIN cam with clutch

Operation and dimensions of this version

10M3T142012 is a double cylinder with clutch: A=39.5 mm, B=54.5 mm, with the two sections totaling L=94 mm. The sections differ by 15 mm; overall length alone does not permit substitution with a symmetrical cylinder or reversal of the two sections.

Key system and installation checks

This series uses controlled-break cuts and bilateral steel control pins. Security Card is used for protected key duplication; it is not proof of universal key compatibility.

When selecting, first record nominal size 40/55 for 10M3T142012, then verify the actual 39.5+54.5=94 mm against the drawing. Nominal size is an ordering identifier; adding its two integers does not give the actual overall length.

Limitations

Dimensions are divided at the central reference in the catalogue drawing; a and B do not automatically designate the outside and inside of the door. Installation also requires checking the lock-body cam interface, door thickness and escutcheon thickness.
Catalogue model numbers and dimensions do not establish current stock availability or certification of the complete door; Before purchase, check the actual supplied product's identification plate and the manufacturer's installation documentation.

Sources

CISA 2026 English catalogue, PDF page 92 / printed page 88

Manufacturer documents are provided in their original language.

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