BS 939:2007
Current
The latest, up-to-date edition.
Engineers\' squares (including cylindrical and block squares). Specification
Hardcopy , PDF
English
31-10-2007
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Foreword
Section 1: General
1 Scope
2 Normative references
3 Terms and definitions
4 Protection against climatic conditions
Section 2: Engineers' try squares
5 Designating size
6 Recommended sizes
7 Material and manufacture
8 General features of design
9 Finish
10 Accuracy
11 Rigidity
12 Marking
Section 3: Cylindrical squares
13 Designating size
14 Recommended sizes and dimensions
15 Material and manufacture
16 General features of design
17 Finish
18 Accuracy
19 Marking
Section 4: Solid form block squares
20 Designating size
21 Recommended sizes and dimensions
22 Material and manufacture
23 General features of design
24 Finish
25 Accuracy
26 Marking
Section 5: Open form block squares
27 Designating size
28 Recommended sizes and dimensions
29 Material
30 General features of design
31 Finish
32 Accuracy
33 Marking
Annexes
Annex A (informative) Notes regarding bevelled edges on blades
of grade AA engineers' try squares
Annex B (informative) Notes on the manufacture and testing of
squares
Bibliography
Defines requirements for engineers' try squares (excluding adjustable squares), cylindrical squares and block squares of solid or open form.
| Committee |
MTE/1
|
| DevelopmentNote |
Supersedes BS 939(1977). (10/2007) Supersedes 07/30163789 DC. (11/2007) Reviewed and confirmed by BSI, October 2012. (09/2012)
|
| DocumentType |
Standard
|
| Pages |
34
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This British Standard specifies requirements for engineers’ try squares (excluding adjustable squares), cylindrical squares and block squares of solid or open form.
Section1 specifies general requirements applicable to all types of square.
Section2 specifies requirements for engineers’ try squares in three grades of accuracy, AA, A and B, with inner lengths of blade from 50mm up to and including 1000mm.
Section3 specifies requirements for cylindrical squares in accuracy grade AA in sizes from 75mm up to and including 750mm.
Section4 specifies requirements for solid form block squares in accuracy grades AA and A in sizes from 50mm×40mm up to and including 1000mm×1000mm.
Section5 specifies requirements for open form block squares in accuracy grades A and B in sizes from 150mm×100mm up to and including 600mm×400mm.
NOTE While the standard provides for squares in various grades of accuracy, it should be noted that their accuracy in use is dependent upon the flatness of the surfaces on which they are used.
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