Table of Contents

1 Scope<br>2 Normative references<br>3 General<br>4 Quality assurance procedure<br>5 Material and manufacture<br>6 Protective finish<br>7 Freedom from defects<br>8 Dimensions<br>9 Head of screws<br>10 Hexalobular drive recess<br>11 Unified thread identifier<br>12 Length of screws<br>13 Screw threads<br>14 Ends of screws<br>15 Length of thread<br>16 Designation<br>17 Identification and marking<br>Annexes<br>Annex A (informative) - Screw equivalency quick reference<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;guide<br>Annex B (informative) - Conversion tables<br>Annex C (informative) - Measuring inspection criteria for<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;countersunk heads<br>Annex D (informative) - Derivation of design of the<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;countersunk head<br>Bibliography

Abstract

Defines the dimensions, materials, protective finishes and part numbers for 100 degrees countersunk head and pan head screws with unified threads for non-structural general aerospace use.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	British Standards Institution
Pages
ISBN
Committee	ACE/12