Machinery's Handbook, 31st Edition
BOLTS, SCREWS, AND NUTS 1671 An externally threaded fastener that must be assembled with a nut to perform its intended service is a bolt . ( Example: heavy hex structural bolt.) An externally threaded fastener that must be torqued by its head into a tapped or other preformed hole to perform its intended service is a screw . ( Example: square head set screw.)
H
H
G
E
R
R
F
L T
25° Approx.
L
Bolt with Reduced Diameter Body
Fig. 1. Square Bolts ( Table 1 )
H .016 Approx.
F
H
F
E
G
G
E
R
L T
R
L
B (Min.) X (Max.)
Y
+0° –15°
30°
30° +0° –15° Fig. 3. Hex Bolts, Heavy Hex Bolts ( Table 3 )
T
L
Fig. 2. Heavy Hex Structural Bolts ( Table 2 )
H
H .016 Approx.
F
E
G
R
R
L T
L
30° Approx.
30° +0° –15° Fig. 4. Hex Cap Screws, Heavy Hex Screws ( Table 4 )
H 1
H 1
F
H .016 Approx.
.016 Approx.
E
G
Fig. 5. Hex Nuts, Heavy Hex Nuts ( Table 7 ) Fig. 6. Hex Jam Nuts, Heavy Hex Jam Nuts ( Table 7 ) Square and Hex Bolts, Screws, and Nuts.— The dimensions for square and hex bolts and screws given in the following tables have been taken from American National Standard ANSI/ASME B18.2.1-2012 and for nuts from American National Standard ANSI/ASME B18.2.2-2015. Reference should be made to these Standards for information or data not found in the following text and tables: Designation: Bolts and screws should be designated by the following data in the sequence shown: nominal size (fractional and decimal equivalent); threads per inch (omit for lag screws); product length for bolts and screws (fractional or two-place decimal equivalent); product name; material, including specification, where necessary; and protective finish, if required. Examples: (1) 3 ∕ 8 -16 × 1 1 ∕ 2 Square Bolt, Steel, Zinc Plated; (2) 1 ∕ 2 -13 × 3 Hex Cap
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