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Knuckle & Round Threads

Lighting Fitting Glass Thread

Rounded (knuckle) profiles tolerate dirt, damage and thin-walled or cast parts, so they are used on couplings, glass, lamp holders and heavy-duty fittings.

Standard
DIN 40450
Sizes listed
6
Range
Glasg 74.5 – Glasg 188
Profile shape (schematic, not to scale)

Thread SizeCover Glass mmCap mmPitch mmThread Length Cover Glass mmThread Length Cap min. mm
Glasg 74.573.5 - 74.569.5 - 72.57.519.0 - 21.022.0
Glasg 84.583.5 - 84.578.0 - 81.07.521.0 - 23.024.0
Glasg 9998.0 - 99.092.5 - 95.57.524.0 - 26.027.0
Glasg 123.5122.5 - 123.5117.0 - 120.07.527.0 - 29.030.0
Glasg 158156.0 - 158.0149.0 - 153.512.037.0 - 40.042.0
Glasg 188186.0 - 188.0179.0 - 183.512.042.0 - 45.047.0
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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" Edison Screw Thread (E) DIN 40400 8 rows · E 5.5 – E 40 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

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.