BS 2693

BS 2693-1:1956 covers general-purpose screwed studs. The standard applies to ferrous and non-ferrous studs and covers Unified, Whitworth and British Association thread forms.

Diagrammatic side view of a general-purpose screwed stud showing threaded ends, nominal diameter and length references

Thread systems covered

Thread designationThread familyReferenced thread standard
UNCUnified coarseBS 1580
UNFUnified fineBS 1580
BSWWhitworth coarseBS 84
BSFWhitworth fineBS 84
BABritish AssociationBS 93

Dimensional reference

Dimension referenceMeaningUnit
dNominal thread diameter, selected from the applicable thread seriesInch or BA series
PThread pitch, determined by the selected thread designationThreads per inch or BA pitch
LNominal overall stud length; standard lengths and tolerances are specifiedInches
b1Threaded engagement length at the metal endInches
b2Threaded length at the nut endInches

Reference note: The diagram is schematic and not to scale; its labels are reference symbols, not a reproduction of the standard’s notation. The public BSI summary confirms the covered thread systems and nominal-length tolerances but does not publish the numeric schedule. Check BS 2693-1 and its referenced thread standard for size-specific dimensions and tolerances.