Name: CISA Asix P8 55/50 double cylinder with clutch (10Q31164012)
Brand: CISA

CISA 10Q31164012 — 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

10Q31164012 dimension diagram: side B 49.5 mm, side A 54.5 mm, overall body length 104 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	54.5 mm
Dimension B	49.5 mm
Overall length L	104 mm

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

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Specifications

Key system: Asix P8
Construction: Double cylinder with clutch
Nominal size: 55/50
Dimension A: 54.5 mm
Dimension B: 49.5 mm
Overall length L: 104 mm
Coding construction: 8 pin positions: 6 active, 2 passive
Body construction: Brass body and plug
Key type: Reversible nickel-plated brass flat key
Operating mechanism: DIN cam with clutch

Operation and dimensions of this version

10Q31164012 is a double cylinder with clutch: A=54.5 mm, B=49.5 mm, with the two sections totaling L=104 mm. The sections differ by 5 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 has key blade length 17 mm and thickness 2.9 mm; Personal Card is also listed. Key dimensions can help check the entry clearance of a protective escutcheon; they do not establish key interchangeability between systems.

When selecting, first record nominal size 55/50 for 10Q31164012, then verify the actual 54.5+49.5=104 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 103 / printed page 99

Manufacturer documents are provided in their original language.

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