Whitworth standard screw thread
E910896
The Whitworth standard screw thread is a pioneering 19th-century British screw thread system that became one of the first widely adopted international engineering standards for fasteners.
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
engineering standard
ⓘ
fastener standard ⓘ screw thread standard ⓘ |
| alsoKnownAs |
BSW thread
ⓘ
British Standard Whitworth NERFINISHED ⓘ |
| countryOfOrigin | United Kingdom ⓘ |
| crestForm | rounded crest ⓘ |
| crestRadius | 0.1373 × pitch ⓘ |
| designGoal |
interchangeability of fasteners
ⓘ
reduction of variety in screw thread forms ⓘ |
| developer | Joseph Whitworth NERFINISHED ⓘ |
| fieldOfUse |
manufacturing engineering
ⓘ
mechanical engineering ⓘ |
| geometryBasis | equilateral triangle with 55-degree included angle ⓘ |
| hasCoarseSeries | BSW coarse thread series GENERATED ⓘ |
| historicalPeriodOfUse |
19th century
ⓘ
early 20th century ⓘ |
| historicalSignificance | foundation for later national and international thread standards ⓘ |
| inception | 1841 ⓘ |
| influenced |
British Standard Fine thread
NERFINISHED
ⓘ
British Standard Pipe thread NERFINISHED ⓘ Unified Thread Standard NERFINISHED ⓘ |
| measurementSystem | inch-based ⓘ |
| notableFeature |
first standardised screw thread system in Britain
ⓘ
one of the earliest internationally adopted engineering standards ⓘ |
| pitchUnit | threads per inch ⓘ |
| relatedStandard |
BSF (British Standard Fine)
NERFINISHED
ⓘ
BSP (British Standard Pipe) NERFINISHED ⓘ |
| replacedBy |
Unified Thread Standard in many applications
NERFINISHED
ⓘ
metric ISO thread in many applications ⓘ |
| rootForm | rounded root ⓘ |
| rootRadius | 0.1373 × pitch ⓘ |
| standardDesignation | BSW NERFINISHED ⓘ |
| standardizedBy | British Standards Institution NERFINISHED ⓘ |
| systemOfUnits | imperial system ⓘ |
| threadAngle | 55 degrees ⓘ |
| threadDepth | 0.6403 × pitch ⓘ |
| threadDirection | primarily right-hand ⓘ |
| threadForm | V-thread with rounded crests and roots ⓘ |
| typicalApplications |
automotive fasteners in early British vehicles
ⓘ
early British machinery ⓘ railway equipment ⓘ steam engines ⓘ |
| usedFor |
bolts
ⓘ
nuts ⓘ screws ⓘ studs ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.