Signature Plastics SA family

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Signature Plastics SA family

Manufacturer	Signature Plastics
Surface profile	Spherical
Inscriptions	Double-shot
Keycap mounts	Various

BBC Micro keycaps from Comptec, for three different switch families

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.<ref name="SP" />

According to Signature Plastics, this family was originally made to fit keyboards made before 1980.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.

File:Signature Plastics SA profile.svg

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

Angle	-13	-7	0	7	0
Size	row 1	row 2	row 3	row 4	space
100	SGM	SGM	SGM	SGM
100C		S M	S M			center nub (slightly off-center)
100D			SGM			deep dish
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
JRET			S			ISO-Return (1.5x2x1.25)

References

<references> <ref name="SP">Pimp My Keyboard — The Origin of SP Keycap Families</ref> </references>

See also

• Space bar dimensions