45 rpm adapter - wikipedia 45 rpm adapter This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( September 2014 ) `` 45 '' RPM automatic spindle adapters. 45 RPM plastic insert. The SX2. A 45 adapter designed for professional DJs. A 45 rpm adapter ( also 45 rpm record insert, 45 rpm spindle adapter, or 7 inch adapter, the common size of 45 RPM records ) is a small plastic or metal insert that goes in the middle of a 45 - rpm record so it can be played on the LP or 78 rpm size spindle of 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. The first 45 rpm inserts were introduced by the Webster - Chicago Corporation, also known as Webcor. They were made of solid zinc, difficult to insert into a record and almost impossible to remove without breaking the disc. A differently shaped, but similarly difficult - to - use metal adapter was made by Fidelitone. Capitol Records for a time produced what they called `` Optional Center '' or `` O.C. 45 '' records. These had a triangular cardboard insert with an LP - size spindle hole ; the cardboard center could be punched out for playing on 45 rpm spindles, but could not be replaced. The spider The former RCA Corporation introduced a snap - in plastic insert known as a spider to make 45 rpm records compatible with the smaller spindle size of a 331⁄3 rpm LP 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 Hutchison adapter included small bumps called `` drive pins, '' which locked the adapters together while revolving, thus preventing the stacked records from slipping against each other. Several manufacturers made `` spider '' adapters in slightly varying shapes and many different colors, though yellow and red were most frequently used. The SX2 The SX2 and The Extender were designed and manufactured by Mark McLaughlan ( adopted surname - changed back to his birth name, Mark Grant, in 1997 ) between the early 1980s and early 1990s. McLaughlan, a Boston area nightclub DJ came up with the design to make 7 '' discs easier to handle when mixing. The original design ( The Extender ) was made up of a platter die - cut from sheets of plastic that McLaughlan would drive on the hood of his car from the supplier in Cambridge, MA to the die - cutter in Ipswich, MA. He would then do the final assembly ( bonding a lathe cut acrylic center piece and a foam pad ) and packaging by hand. The SX2 ( Single Extender, Rev 2 ) was manufactured by plastic injection at Spirit, Inc. in Wakefield, Massachusetts. One of the main design revisions required for the manufacturing process was a series of ' ribs ' on the underside of the platter to prevent warping from the extreme changes in temperature during the plastic injection process. McLaughlan also incorporated a raised barrier to contain the head ( in the event of miscuing ) and a polished surface inside the barrier to minimize damage to the stylus. Due to its limited manufacturing run the SX2 has become a sought after rarity among pro DJs. References Jump up ^ Scratch - Free Phono, Popular Mechanics Aug 1962 Volume 118 Accessed via Google Books July 8, 2014 Jump up ^ https://commons.wikimedia.org/wiki/File:SX2_Article.jpg Boston Globe, August 25, 1991 Jump up ^ http://www.popsike.com/Mega-Rare-Funk-45-SX2-12-DJ-Adapters-Look-New/250658303207.html popsike.com auction page Physical audio recording formats Mechanical Music box cylinder or disc ( IX century ) Mechanical cuckoo ( early XVII century ) Punched card ( 1881 ) Music roll ( 1883 ) Analog Grooved surface Phonautogram ( 1857 ) Grooved cylinder Phonograph cylinder ( 1877 ) Graphophone / Dictaphone cylinder ( 1887 ) Perfected phonograph / Ediphone ( 1888 ) Salon cylinder ( 1890s ) Stentor cylinder ( 1890s ) Le Céleste cylinder ( 1890s ) Gold moulded record ( 1902 ) Indestructible record ( 1907 ) Amberol record ( 1908 ) Blue Amberol record ( 1912 ) Paradis cylinder ( 1913 ) Grooved disc Phonograph record ( 1889 ) Pathé disc ( 1905 ) Diamond disc ( 1912 ) Pathé Actuelle ( 1920 ) Edison Voicewriter ( late 1940s ) SoundScriber ( 1945 ) Audograph ( 1945 ) Dictabelt ( 1947 ) Long play ( 1948 ) Highway Hi - Fi ( 1956 ) Grooved tape Tefiphon ( early 1930s ) Teficord ( early 1930s ) Tefifon ( 1936 ) Sound - on - film Phonofilm ( 1919 ) Tri-Ergon ( 1922 ) Movietone ( 1926 ) Photophone ( 1929 ) Fantasound ( 1940 ) Loose magnetic wire Wire recording ( 1898 ) Magnetic wire cartridge Lorenz Textophon ( 1942 ) US Army RD - 11B / GNQ - 1 ( 1944 ) Cosmos Industries MX - 303A / ANQ - 1 ( 1944 ) RCA MI - 12875 ( 1947 ) RCA MI - 12877 ( 1947 ) Peirce 265B ( 1951 ) Peirce 330 / 360 ( 1951 ) Protona Minifon P51 ( 1951 ) Protona Minifon P55 ( 1955 ) Protona Minifon special ( 1961 ) Crouzet - Jaeger cassette ( 1962 ) Magnetic surface Magnetic stripe card ( 1900 ) Magnetic disc Telefunken magnetic disc ( 1945 ) Thermionic Products Recordon ( 1948 ) Record Maker Pye ( 1953 ) Synchrofax ( 1959 ) Audio High Density ( 1978 ) Loose magnetic tape Blattnerphone ( 1928 ) Magnetophon ( 1935 ) 1 / 4 '' tape ( 1949 ) 1 / 2 '' tape ( 1953 ) Fullcoat magfilm ( 1953 ) Stripe magfilm ( 1953 ) 1 '' tape ( 1957 ) 2 '' tape ( 1967 ) 3 / 4 '' tape ( 1969 ) 3 '' tape ( 1978 ) Magnetic tape cartridge Optaphon ( 1951 ) Cousino Echo - matic ( 1952 ) Mohawk Message repeater cartridge ( 1953 ) Stenorette ( 1954 ) Mohawk Midgetape RL ( 1955 ) Dictaphone Dictet ( 1957 ) Rediffusion Reditune ( 1957 ) Saba Sabafon ( 1958 ) RCA tape cartridge ( 1958 ) Philips EL 3581 ( 1958 ) Protona Attaché ( 1959 ) Fidelipac ( 1959 ) Cousino MR - 9000 ( 1960 ) IBM Magnabelt ( 1961 ) Dictaphone Travel master ( 1961 ) Nippon Electronic Vity cassette ( 1961 ) Grundig Cassette LFH 0084 ( 1962 ) Orrtronic Tapette ( 1962 ) 3M Scotch ( 1962 ) Cousino Echo - matic II ( 1962 ) Stereo - Pak ( 1962 ) Philips EL 3583 ( 1963 ) Compact cassette ( 1963 ) Grundig DC - International ( de ) ( 1964 ) Grundig En3 ( 1964 ) Sabamobil ( 1964 ) 8 - track ( 1964 ) Micro pack 35 ( 1964 ) Assmann - Stuzzi Memocord ( 1965 ) Cantata 700 ( 1965 ) Nippon Electronic Memo - call ( 1965 ) PlayTape ( 1966 ) Mini-cassette ( 1967 ) Muntz Stereo Mini-twin ( 1967 ) Grundig DeJ614 ( 1968 ) Microcassette ( 1969 ) Sanyo Tape cartridge ( 1969 ) HiPac ( 1971 ) Steno - Cassette ( 1971 ) Stenorette DL ( 1972 ) Capitol Records Audiopak ( 1972 ) Elcaset ( 1976 ) Bandai micro cartridge ( late 1980s ) Picocassette ( 1985 ) Pocket Rockers ( 1988 ) Standalone adaptor Soundstream ( 1976 ) X80 / ProDigi ( 1980 ) DASH ( 1982 ) PCM adaptor ( 1982 ) DA - 88 / DTRS ( 1993 ) Digital Magnetic tape cartridge Digital Audio Tape ( 1987 ) NT ( 1992 ) Digital Compact Cassette ( 1992 ) Sound - on - film CDS ( 1990 ) Dolby Digital ( 1992 ) DTS ( 1993 ) SDDS ( 1993 ) Optical disc Compact disc ( 1982 ) Philips CD - BGM ( 1989 ) MiniDisc ( 1992 ) HDCD ( 1995 ) Super Audio CD ( 1999 ) DVD - Audio ( 2000 ) DataPlay ( 2002 ) Hi - MD ( 2004 ) DualDisc ( 2004 ) BD - Audio ( 2008 ) HFPA ( 2013 ) MQA - CD ( 2014 ) Electronic circuit Sound chip ( late 1970s ) Mp3 player ( 1996 ) HitClips ( 1999 ) Yaboom Box ( 1999 ) Takara E-kara ( 2001 ) Toymax VJ Starz ( 2002 ) USB flash drive ( 2004 ) MicroSD ( 2007 ) Hybrid Pioneer Artists Compact LaserDisc ( 1986 ) CD Video ( 1987 ) ADAT ( 1991 ) Timecode vinyl ( 2001 ) VinylDisc ( 2007 ) Retrieved from `` https://en.wikipedia.org/w/index.php?title=45_rpm_adapter&oldid=834546235 '' Categories : Recorded music Hidden categories : Articles needing additional references from September 2014 All articles needing additional references Talk About Wikipedia Add links This page was last edited on 6 April 2018, at 08 : 59 ( UTC ). 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Question: what is the name of the plastic insert on a 45 record
Answer: 45 rpm adapter