Thumbturn Mortise Cylinder FHC RCT20112 – 1-1/2-Inch with 3 mm Trim Ring

Special order. Stock is confirmed after checkout. Email customerservice@emergencydoorandglassrepair.com if you are unsure this is the correct part. Orders over $5,000 can be paid by ACH; other orders use card checkout.

Mortise thumbturn cylinder. 1-1/2 inches long with a 3 mm trim ring. Confirm length against door thickness before ordering. Adams Rite 4066 is typically 1 inch long — not the same part.

Manufacturer identification

• Manufacturer: FHC
• Official manufacturer part number: RCT20112
• Product category: Thumbturn mortise cylinder
• Unit: Each

Verified specifications

• Length: 1-1/2 in
• Trim ring: 3 mm
• Finishes: four architectural finishes (FHC). Confirm suffix before order.
• Door type / width / weight / spindle / hold-open / opening degree: not applicable
• Handing: not handed

Included components

• Thumbturn cylinder with 3 mm trim ring

Optional / sold separately

• Matching mortise cylinder
• Lock body
• Los Angeles-area installation — request a quote; not included

Installation requirements

• Cylinder length must match door thickness plus trim ring.

Warranty terms

Not stated on the FHC product page reviewed August 16, 2026.

Return restrictions

Installed thumbturns are likely non-returnable.

Shipping

• Shipping weight: not stated
• Shipping is calculated separately. This listing does not include free shipping.

Compatibility warning

Commercial door hardware is application-specific. Verify manufacturer, model, dimensions, handing, spindle, door type, and existing installation before ordering. If uncertain, text clear photos and measurements to 310-933-2600. Identification assistance does not replace field verification.

Need help?

• Text photos for identification: 310-933-2600
• Email installation quotes and order questions to customerservice@emergencydoorandglassrepair.com. Replies are by email only.