BS 906-1:1972

This standard BS 906-1:1972 Specification for engineers' parallels is classified in these ICS categories:

• 17.040.30 Measuring instruments

This British Standard applies to parallel sided steel blocks of six sizes in Grade A and eight sizes in Grade B, namely:

GRADE A

5 mm × 10 mm × 100 mm

10 mm × 20 mm × 125 mm

15 mm × 30 mm × 150 mm

20 mm × 40 mm × 200 mm

25 mm × 50 mm × 250 mm

30 mm × 60 mm × 300 mm

GRADE B

5 mm × 10 mm × 100 mm

10 mm × 20 mm × 125 mm

15 mm × 30 mm × 150 mm

20 mm × 40 mm × 200 mm

25 mm × 50 mm × 250 mm

30 mm × 60 mm × 300 mm

40 mm × 80 mm × 350 mm

50 mm × 100 mm × 400 mm

NOTE 1 See also 2, Material.

NOTE 2 The titles of the British Standards referred to in this standard are listed on page ii.

Six sizes of Grade A and eight of Grade B parallels with cross sections from 5 mm x 10 mm to 30 mm x 60 mm and from 5 mm x 10 mm to 50 mm x 100 mm respectively. Material, finish, accuracy, marking, protection.