Traditional Engineers’ Square
Traditional Engineers’ Square
HAND TOOLS
Traditional Engineers’ Square - 400 Series - Tolerances - (Microns)
At a Glance
Size of Square 3" 75mm
4" 100mm
6" 150mm
9" 225mm
12" 300mm
• Standard: To BS939 / Grade B
Straightness of Blade Edge
8
8
8
8
12
Parallelism of Blade Edges
8
8
8
12
12
Features
Flatness of Working Faces of Stock (any deviation must be concave)
4
6
6
8
8
• Precision ground blade and stock • Blind rivetted construction • Hardened and tempered blades • Supplied boxed
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 Squareness of Edges of Blade to Side Faces of Stock Squareness of Edges of Blade to Working Faces of Stock
57
57
75
114
134
4006R
15
15
15
15
15
16
16
16
16
24
144
145
Lateral Squareness of Blade
125
250
250
375
375
Dimensions
Traditional Engineers’ Square - Grade B
Approx. Stock Length (mm) (inside face)
Blade
Stock
Inner Working
Square Size Faces
Blade Length (mm)
Blade Length (inch)
Code No
A
B
C
D
E
F
G
H
4003R
75
3
49
3" (75mm)
104.8
25.4
1.42
68.5
25.4
12.7
49.3
79.4
4004R
100
4
56
4" (100mm)
130.2
25.4
1.42
76.2
25.4
12.7
57.0
104.8
4006R
150
6
82
6" (150mm)
181.0
25.4
1.42
101.6
25.4
12.7
82.4
155.6
4009R
225
9
108
9" (225mm)
273.1
38.1
3.15
139.7
38.1
19.05
107.9
234.95
40012R
300
12
139
12" (300mm)
355.6
44.4
3.15
177.8
44.4
22.2
139.7
311.2
A H
INNER LENGTH OF BLADE AND DESIGNATING SIZE OF SQUARE
B
BLADE
C
D G
INNER WORKING FACE
INNER EDGE
OUTER EDGE
E
SIDE FACE
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STOCK
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F
OUTER WORKING FACE
Bowers Group | sales@bowersgroup.co.uk | www.bowersgroup.co.uk
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