MARYLAND METRICS
THREAD DATA CHARTS

W    Cylindrical Whitworth Thread according to DIN 477
Thread call out	P Gg/1“ / TPI	Core-Ø Min.4)	Nut Thread Minor-Ø Max.	Drill-Ø ØB
W 21,8 x 1/14	14	19,496	20,066	19,75
W 24,32 x 1/14	14	22,016	22,586	22,25
W 1 x 1/8	8	21,339	22,152	22,00

W    Taper Whitworth Thread according to DIN 477
Thread call out	P Gg/1“ / TPI	Gauge plane of tap Lm	Drill-Ø cylindrical Max.	Drill-Ø taper 5) ØB
W 19,8 x 1/14 keg.	14	24,2	14,7	16,8
W 28,8 x 1/14 keg.	14	29,2	22,7	25,4
W 31,3 x 1/14 keg.	14	29,2	25,2	27,9

4) Minor-Ø of nut thread accord. to DIN 477 part 1 5) For mass production preparation of a taper core hole is recommended. (BK) Notes: DIN 477 is similar to ISO 11116-1 The Ø symbol = diameter

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