Traditional Engineers’ Square
Traditional Engineers’ Square
WORKSHOP RETAIL PACKS
A
Workshop Square: Grade B
H
Features
Blade Length (mm)
Blade Length (inch)
Approx. Stock Length (mm) (inside face)
Code No
B
• Standard: To BS939 / Grade B • Precision ground blade and stock • Blind rivetted construction • Hardened and tempered blades • Supplied boxed
C
D
4003R
75
3
49
G
4004R
100
4
56
4006R
150
6
82
E
4009R
225
9
108
40012R
300
12
139
F
Dimensions (mm)
Inner length of blade and designating size of square
Blade Length (mm)
Square Size
Stock
Inner Working
Blade
Outer edge
Inner edge
Inner working face
Faces (inch / mm) A
B
C
D E
F
G H
3 / 75
104.8 25.4
1.42
68.5
25.4
12.7
49.3
79.4
349
348
4 / 100
4006R
130.2 25.4
1.42
76.2
25.4
12.7
57.0
104.8
Side face
Stock
6 / 150
181.0 25.4
1.42
101.6 25.4
12.7
82.4
155.6
Outer working face
9 / 225
273.1 38.1
3.15
139.7 38.1
19.05 107.9 234.95
12 / 300
355.6 44.4
3.15
177.8 44.4
22.2
139.7 311.2
400R Series Engineers Squares Tolerances (Microns)
Size of Square 3" / 75mm 4" / 100mm 6" / 150mm 9" / 225mm 12" / 300mm
Straightness of Blade Edges
8
8
8
8
12
Parallelism of Blade Edges
8
8
8
12
12
Flatness of Working Faces of Stock (any deviation must be concave)
4
6
6
8
8
Parallelism of Working Faces of Stock
5
5
5
8
8
Parallelism of Side Faces of Stock
25
25
25
50
50
Squareness of Side Faces of Stock to Working Faces of Stock
57
57
75
114
134
Squareness of Edges of Blade to Side Faces of Stock 15
15
15
15
15
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Squareness of Edges of Blade to Working Faces of Stock
16
16
16
16
24
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Lateral Squareness of Blade
125
250
250
375
375
Bowers Group | sales@bowersgroup.co.uk | www.bowersgroup.co.uk
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