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BSA UNIT GEARBOX
BSA unit singles have used  a confusing number of chain sizes, please check what size chain you use.
!

DRAIN PLUG GEARBOX, UNF THREAD
21-1857
!
bsaunitaftapplugbak_000
13TPI

6206
29-3857
!

30X 62 X 16
6206, LJ30
Sleeve gear/mainshaft BSA C15, B25, B40.
57-1469 Triumph 21, 3TA, 5TA, T100 units

KICKSTART SPRING
40-3275
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KICKSTART LEVER UNIT SINGLES
41-3021
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Alternative number 57-2764

SPROCKET NUT UNIT SINGLES
57-1434
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BSA number 40-3051
1 1/8" inner
1 7/16" outer

SPROCKET B25/44/50 WIDE 17T
57-1558
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For wide chain 5/8" x 3/8" (or 530 in Japanese)

KICKSTART LEVER CUB/C15
57-1679
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BSA 40-3083

CIRCLIP ON LAYSHAFT
57-2669
!
Old number 41-3078

THRUST WASHER
57-2672
!
Old number 40-3279

KICKSTART RATCHET B25/44
57-2681
!
40-3279

KICKSTART GEAR B25/44
57-2683
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NEW OLD STOCK

TAB WASHER ON EARLY MAINSHAFTS
57-2685
!