Cite
HARVARD Citation
Institution,, B. (2022) Aerospace series. Externally threaded fastener, 100° countersunk normal head, Spiral Drive Recess. Classification: 1 100 MPa (at ambient temperature)/425 °C.. [Online]. London : British Standards Institution. Available from: http://access.bl.uk/ark:/81055/vdc_100145719060.0x000001