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Knuckle & Round Threads

Edison Screw Thread (E)

Round thread for lamp bases and sockets, e.g. E14 and E27.

Standard
DIN 40400
Sizes listed
8
Range
E 5.5 – E 40
Profile shape (schematic, not to scale)

Thread SizeMajor Diameter mmTapping Drill Size mmPitch mm
E 5.55.54.91.0
E 1010.08.81.81
E 1414.012.52.82
E 1616.014.72.50
E 1818.017.03.00
E 2727.024.53.62
E 3333.030.84.23
E 4040.036.36.35
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Related Standards

Dairy Coupling Thread DIN 11851 13 rows · Rd 28 x 1/8" – Rd 190 x 1/4" Knuckle Thread (Rd), Inch Pitch DIN 405 63 rows · Rd 8 x 1/10" – Rd 200 x 1/4" Glass Container Knuckle Thread (GL) DIN 168 24 rows · GL 8 – GL 125 Knuckle Thread (Rd), Metric Pitch DIN 20400 47 rows · Rd 10 – Rd 300 Lighting Fitting Glass Thread DIN 40450 6 rows · Glasg 74.5 – Glasg 188

Reference values only. Verify against the current edition of the governing standard before use in production drawings or manufacturing. Provided by Micro Components as a free engineering resource.