BS 5204-1:1975
Current
The latest, up-to-date edition.
Hardcopy , PDF
English
30-04-1975
Cooperating organizations
Foreword
Specification
1. Scope
2. References
3. Nomenclature
4. Material
5. Lengths of straightedges
6. General features
7. Finish
8. Flatness of working surfaces
9. Equality of depths
10. Flatness of side faces
11. Squareness of working surface and side faces
12. Marking
13. Protection against climatic conditions
14. Case
Appendices
A. Minimum general dimensions for straightedges
B. Recommended methods of testing cast iron
straightedges
C. Recommended chemical compositions of plain and
alloy cast irons and method of heat treatment
Tables
1. Tolerances on flatness of working surfaces
2. Tolerances on equality of depth between working
surface and faces of support feet (bow shaped):
tolerances on uniformity of depth between working
surfaces (I-section)
3. Minimum general dimensions for bow shaped straight-
edges
4. Minimum general dimensions for I-section straight-
edges
Figures
1. Bow shaped straightedge
2. I-section straightedge
3. Exaggerated illustration of squareness deviation
4. Alternative positions
5. Design of supporting feet
6. Alternative methods of using parallel blocks to
support the straightedge in position (b) of figure 4
7. Test by inclination method
8. Plotting of readings
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.