45 rpm adapter

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A 45 rpm adapter (also 45 rpm record insert, or 45 rpm spindle adapter) is a small plastic insert that goes in the middle of a 45-rpm record so it will play on a turntable. The adapter could be a small solid circle that fits onto the bottom of the spindle (meaning only one 45 could be played at a time) or a larger adapter that fits over the entire spindle, permitting a stack of 45s to be played.

"45" RPM automatic spindle adapters.
"45" RPM automatic spindle adapters.

[edit] The "Spider"

The former RCA Corporation tailored to the smaller spindle size of an LP record player with a plastic insert known as a "spider". These snap-in inserts allowed a 45 rpm record to be played on a 33 1/3 rpm record player. Commissioned by RCA president David Sarnoff and invented by Thomas Hutchison, "spiders" were prevalent in the 1960s and sold tens of millions per year.

The 45 RPM plastic insert is a symbol for the music enthusiast.
The 45 RPM plastic insert is a symbol for the music enthusiast.