45° 4×4×6 Window Frame, Sloped, Convex (Part 4741)
Custom LEGO part image © 2025 Tom Alphin / Brick Architect.
The angles align with a stack of three bricks with 45° slope, but the actual slope angle is +/- 48.5°.
"In 1984, #6971 Inter-Galactic Command Base included two stacked roof windows 4x4x3 which created a triangular window frame. It looked great but did not make for a stable build, and so two years later [this part] was introduced."¹
1. Tim Johnson, LEGO Space: 1978-1992 (Dark Horse Books, 2023), page 89.
External Links
LEGO parts are described differently on other websites and may use different part numbers.
Ranking based on buying one copy of every LEGO set, counting the number of sets containing each part, then sorting by part and color.
Overall Rank is a weighted score combining the number of parts, sets, and colors produced.
