Signature Plastics SA family
|This article requires photographic illustration|
The SA family is a spherical keycap profile family offered by Signature Plastics. "SA" denotes spherical keycaps, with the same profile across all rows. Originally a flat profile, SA was followed by the spherical sculptured SS profile, which was later retired. SA itself was later retooled for a sculptured profile, but retained its existing name.
According to Signature Plastics, this family was originally made to fit keyboards made before 1980. Currently, this family does contain space bars which measure 4, 6.25, 7 and 8 units, which were most widely used back then.
Available keycap sizes and shapes
- S: semi-matte (smooth) top and sides
- G: gloss top and sides
- M: matte top (rough), semi-matte sides
The size is in units × 100. Space bars are row 3 with convex top.
Rows 2 and 4 are identical. Legends for all rows can be used 180 degrees turned. 1 units row 3 keys are symmetrical by 90 degrees. For example row 4 Z can serve as row 2 Z in DE-layout. Row 3 cursor arrows are usable for all 4 directions.
Table of confirmed key sizes
|Size||row 1||row 2||row 3||row 4||space|
|100C||S M||S M||center nub (slightly off-center)|
|125||S M||S M||S M|
|150||S M||S M||SGM||S M|
|175||S M||S M||S||S M|
|175S||S M||stepped, off-center mount (like 1.25 units key)|
|200||S||S M||SGM||S M||Stabiliser 0.625 units left and right|
|200P||S||S M||SGM||S M||fits on 2 switches|
|225||S||S||S||Stabiliser 0.625 units left and right|
|250||S M||S||Stabiliser 0.625 units left and right|
|275||S||S||S||Stabiliser 0.625 units left and right|
|300||SGM||Stabiliser 1 unit left and right|
|400||S M||Stabiliser 1.5 units left and right|
|450||S||Stabiliser 1.82 units left and right|
|625||S||fits Cherry, Filco and Leopold|
|700||S||Stabiliser 3 units left and right, 2.25 units right|
|800||SGM||Stabiliser 3.5 units left and right|
|900||S M||Stabiliser 3.5 units left and right|
|2X2||S||Stabiliser 0.625 units left and right in one row|
- Pimp My Keyboard — The Origin of SP Keycap Families