BS 906-2:1972
Current
The latest, up-to-date edition.
Specification for engineers\' parallels. Imperial units
Hardcopy , PDF
English
16-06-1972
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FOREWORD
SPECIFICATION
1. SCOPE
2. MATERIAL
3. STANDARD SIZES
4. FINISH
5. ACCURACY
6. PROTECTION
7. MARKING
Seven sizes of Grade A parallels with cross section ¼ in x ½ in to 1½ in x 3 in and nine of Grade B parallels with cross sections ¼ in x ½ in to 2 in x 4 in. Material, standard sizes, finish, accuracy, protection and marking.
| Committee |
TPR/1
|
| DevelopmentNote |
Supersedes BS 906(1940) (10/2005) Reviewed and confirmed by BSI, February 2012. (01/2012)
|
| DocumentType |
Standard
|
| Pages |
8
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
This British Standard applies to parallel steel blocks of the following grades and sizes:
Grade A accuracy. Sizes ¼ in × ½ in × 4 in to 1½ in × 3 in × 12 in.
Grade B accuracy. Sizes ¼ in × ½ in × 4 in to 2 in × 4 in × 16 in.
The parallels of Grade A accuracy are high precision parallels primarily intended for inspection; those of Grade B accuracy are primarily intended for general tool room work.
NOTE 1. The larger sizes of parallels may be made with a series of lightening holes drilled through their thickness, provided that the accuracy of the parallels is not thereby affected.
NOTE 2. The titles of the British Standards referred to in this standard are listed on page 2.
| BS 957-1:1941 | Specification for feeler gauges Inch units |
| BS 1685:1951 | Specification for bevel protractors (mechanical and optical) |
| BS 959:1950 | Specification for internal micrometers (including stick micrometers) |
| BS 959:2008 | Specification for internal micrometers (including stick micrometers) |
| 08/30177716 DC : DRAFT JUNE 2008 | BS 959 - SPECIFICATION FOR INTERNAL MICROMETERS (INCLUDING STICK MICROMETERS) |
| BS 870:1950 | Specification for external micrometers |
| BS 852:1939 | Specification for toolmakers\' straightedges |
| BS 906-1:1972 | Specification for engineers\' parallels Metric units |
| BS 4779:1971 | Recommendations for measurement of the optical transfer function of optical devices |
| BS 1133-6(1966) : 1966 | PACKAGING CODE - TEMPORARY PROTECTION OF METAL SURFACES AGAINST CORROSION (DURING TRANSPORT AND STORAGE) |
| BS 891-1:1962 | Method for Rockwell hardness test Testing of metals |
| BS 906-1:1972 | Specification for engineers\' parallels Metric units |
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