ASTM A325 & A490 BOLTS & NUTS
Bolt Length w/
Single Nut & Single Washer Calculator
Bolt Length w/
Single Nut & Single Washer Calculator
Enter Grip Inches
Enter Grip millimeters
Bolt
Grip
Dia.
1/2
1 1/4
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2
1 -With F.W.
2 -With Bevel Washer
1-Lg.
Inches
2.09
2-Lg.
Inches
2.25
Adjust
Bolt
Length
to the
Next
1/4"
Bolt
Grip
Dia.
13
32
16
19
22
25
30
32
35
38
1 -With F.W.
2 -With Bevel Washer
1-Lg.
mm
53.43
2-Lg.
mm
57.40
Adjust
Bolt
Length
to the
Next
6mm
Bolt Length
In order to determine the required bolt length, the value in the table below should be added to the Grip (I.e., the total thickness of all connected
material, exclusive of washers) or enter the Grip in the Calculator above for single nut with washer. The values are generalized with due allowance
for manufacturing tolerances to provide for full thread engagement of heavy hex nut, when installed. For each hardened flat washer that is used
add 5/32-inch , and for each bevel washer add 5/16-inch . The length is determined by use of the table/calculator should be adjusted to the next 1/4-inch.
Specify thread length when using Double Nuts
Nominal
Bolt
Size
Single Nut
Double Nut
Double
To determine required Bolt
To determine required Bolt
Nut
Length Add to Grip
Length Add to Grip
Thread Length
Inches (mm)
Inches
millimeters
Inches
millimeters
Inches
millimeters
1/2" (13)
5/8" (16)
3/4" (19)
7/8" (22)
1" (25)
1-1/8" (29)
1-1/4" (32)
1-3/8" (35)
11/16"
7/8"
1"
1-1/8"
1-1/4"
1-1/2"
1-5/8"
1-3/4"
17
22
25
29
32
38
41
44
1-3/16"
1-1/2"
1-3/4"
2"
2-1/4"
2-5/8"
2-7/8"
3-1/8"
30
38
44
51
57
67
73
79
1-1/2"
1-7/8"
2-1/8"
2-3/8"
2-3/4"
3-1/8"
3-1/4"
3-5/8"
38
48
54
60
70
79
83
92
Adjust
Bolt
Length
to the
Next
1/4"
or
6mm
6mm
1-1/2" (38)
1-7/8"
48
3-3/8"
86
3-3/4"
95
Bolted Parts (ASTM A325 & A490 BOLTS)
The slope of surfaces of bolted parts in contact with the bolt head and nut shall not exceed 1:20 with respect to plane normal to the bolt
axis. Bolted steel parts shall not be separated by gaskets and shall fit solidly together after bolts are tightened. Holes may be be punched,
sub-punched and reamed, or drilled, as required by applicable code or specification. Standard holes shall have a diameter 1/16" in excess of
the nominal bolt diameter.
A490 bolts and galvanized A325 bolts shall not be reused. Retightening previous tightening of adjacent bolts
shall not be considered as reuse.
Oversized Holes may have nominal diameters up to: 3/16" larger than bolts 7/8" and less in diameter, 1/4" for 1" in diameter
and 5/16" larger than bolts 1-1/8" and greater in diameter. Haredened washers shall be installed over oversized holes in an outer ply.
Oversized and Slotted Holes
Max. Holes Size (Nominal) Inches
Nominal
Bolt
Size
Oversize
Holes
1/2"
5/8"
3/4"
7/8"
1"
1-1/8"
1-1/4"
1-3/8"
1-1/2"
>1-1/2"
5/8"
13/16"
15/16"
1-1/16"
1-1/4"
1-7/16"
1-9/16"
1-11/16"
1-13/16"
d+5/16"
Short
Slotted
Holes
Max. Holes Size (Nominal) millimeters
Long
Slotted
Holes
9/16"x11/16"
9/16"x1-1/4"
11/16"x7/8"
11/16"x1-9/16"
13/16"x1"
13/16"x1-7/8"
15/16"x1-1/8"
15/16"x2-3/16"
1-1/16"x1-5/16"
1-1/16"x2-1/2"
1-3/16"x1-1/2"
1-3/16"x2-13/16"
1-5/16"x1-5/8"
1-5/16"x3-1/8"
1-7/16"x1-3/4"
1-7/16"x3-7/16"
1-9/16"x1-7/8"
1-9/16"x3-3/4"
(d+1/16")x(d+3/8") (d+1/16")x(2.5xd)
Nominal
Bolt
Size
Oversize
Holes
Short
Slotted
Holes
Long
Slotted
Holes
13
16
19
22
25
29
32
35
38
>38
16
21
24
27
32
37
40
43
46
>46
14x17
17x22
21x25
24x29
27x33
30x38
33x41
37x44
40x58
(d+2)x(d+9)
14x32
17x40
21x48
24x56
27x64
30x71
33x79
37x87
40x95
(d+2)x(2.5xd)
Minimum Bolt Spacing
The distance between centers of standard, oversized, or slotted fasteners shall be not less than 2 2/3d where "d" is the nominal
diameter of the fastener, inches. A distance of 3d is preferred.
Minimum Edge Distance Table Inches
Minimum Edge Distance Table millimeters
(Center of Standard Hole to Edge of Connected Part)
(Center of Standard Hole to Edge of Connected Part)
Nominal
Bolt
Size
@
Sheared
Edges
1/2"
5/8"
3/4"
7/8"
7/8"
1-1/8"
1-1/4"
1-1/2" *
'@' Rolled Edges of
Plates, Shapes or Bars
or Gas Cut Edges
3/4"
7/8"
1"
1-1/8"
1-3/4" *
1"
1-1/4"
1-1/8"
2"
1-1/2"
1-1/4"
2-1/4"
1-5/8"
>1-1/4"
1.75x Dia.
1.25x Dia.
These may be 1-1/4" @ the ends of beam connection angles
Nominal
Bolt
Size
@
Sheared
Edges
13
16
19
22
22
29
32
38
B
Wrench Clearance Guide
Bolt
Size
19
22
25
29
25
44
32
29
51
38
32
57
41
>32
1.75x Dia.
1.25x Dia.
These may be 32 @ the ends of beam connection angles
c
A
'@' Rolled Edges of
Plates, Shapes or Bars
or Gas Cut Edges
Socket Wrench
Open End Wrench
Inches (mm)
Inches (mm)
Inches (mm)
A
B
C
A
B
C
1/4" (6)
3/8" (10)
3/4" (19)
1-1/8" (29)
1/2" (13)
3/4" (19)
1/2" (13)
3/4" (19)
1" (25)
1-3/8" (35)
7/8" (22)
1-1/8" (29)
5/8" (16)
3/4" (19)
1/2" (13)
5/8" (16)
3/4" (19)
7/8" (22)
1" (25)
1-1/8" (29)
1-1/4" (32)
1-3/8" (35)
1-1/2" (38)
1-3/8" (35)
1-5/8" (41)
1-7/8" (48)
2-1/8" (54)
2-3/8" (60)
2-5/8" (67)
2-7/8" (73)
3-1/8" (79)
3-3/8" (86)
7/8" (22)
1" (25)
1-1/8" (29)
1-1/4" (32)
1-3/8" (35)
1-1/2" (38)
1-5/8" (41)
1-3/4" (44)
1-7/8" (48)
7/8" (22)
1" (25)
1-1/8" (29)
1-1/4" (32)
1-3/8" (35)
1-1/2" (38)
1-5/8" (41)
1-3/4" (44)
1-7/8" (48)
1-3/4" (44)
2-1/8" (54)
2-5/8" (67)
3" (76)
3-1/4" (83)
3-3/8" (86)
3-7/8" (98)
4-3/8" (111)
4-7/8" (124)
1-3/8" (35)
1-1/2" (38)
1-5/8" (41)
1-7/8" (48)
2-1/8" (54)
2-1/4" (57)
2-1/2" (64)
2-3/4" (70)
2-7/8" (73)
7/8" (22)
1-1/8" (29)
1-1/4" (32)
1-5/8" (41)
1-7/8" (48)
1-7/8" (48)
2" (51)
2-1/4" (57)
2-1/2" (64)
W
F
H
Bolt Length
H
ASTM A325 & A490 BOLTS & NUTS DIMENSIONS,Inches (mm)
Bolt Dimensions. Inches
Heavy Hex Structural Bolts
Nominal
Bolt Size Width across
flats F
D
Nut Dimensions, Inches
Heavy Hex Nuts
Height
Thread
Length
1" (25)
1-1/4" (32)
1-3/8" (35)
1-1/2" (38)
1/2" (13)
5/8" (16)
3/4" (19)
7/8" (22)
7/8" (22)
1-1/16" (27)
1-1/4" (32)
1-7/16" (37)
H
5/16" (8)
25/64" (10)
15/32" (12)
35/64" (14)
1" (25)
1-1/8" (29)
1-1/4" (32)
1-3/8" (35)
1-5/8" (41)
1-13/16" (46)
2" (51)
2-3/16" (56)
39/64" (15)
11/16" (17)
25/32" (20)
27/32" (21)
1-1/2" (38)
2-3/8" (60)
15/16" (24)
Width across
flats W
Height
7/8" (22)
1-1/16" (27)
1-1/4" (32)
1-7/16" (37)
H
31/64" (12)
39/64" (15)
47/64" (19)
55/64" (22)
1-3/4" (44)
2" (51)
2" (51)
2-1/4" (57)
1-5/8" (41)
1-13/16" (46)
2" (51)
2-3/16" (56)
63/64" (25)
1-7/64" (37)
1-7/32" (31)
1-11/32" (34)
2-1/4" (57)
2-3/8" (60)
1-15/32" (37)
WASHER DIMENSIONS, Inches (mm)
Circular Washers
Nominal
Nominal
Nominal
Sq. or Rect. Bevel Washers
Thickness
Minimum
Slope or
Bolt Size
D
Outside
1/2" (13)
5/8" (16)
3/4" (19)
7/8" (22)
Diameter
1-1/16" (27)
1-5/16" (33)
1-15/32" (37)
1-3/4" (44)
1" (25)
1-1/8" (29)
1-1/4" (32)
1-3/8" (35)
1-1/2" (38)
Diameter
of Hole
Side
Mean
Taper in
17/32" (13)
11/16" (17)
13/16" (21)
15/16" (24)
Min.
0.097 (2)
0.122 (3)
0.122 (3)
0.136 (3)
Max.
0.177 (4)
0.177 (4)
0.177 (4)
0.177 (4)
Dimension
1-3/4" (44)
1-3/4" (44)
1-3/4" (44)
1-3/4" (44)
Thickness
5/16" (8)
5/16" (8)
5/16" (8)
5/16" (8)
Thickness
1:6'
1:6'
1:6'
1:6'
2" (51)
2-1/4" (57)
2-1/2" (64)
2-3/4" (70)
1-1/8" (29)
1-1/4" (32)
1-3/8" (35)
1-1/2" (38)
0.136 (3)
0.136 (3)
0.136 (3)
0.136 (3)
0.177 (4)
0.177 (4)
0.177 (4)
0.177 (4)
1-3/4" (44)
2-1/4" (57)
2-1/4" (57)
2-1/4" (57)
5/16" (8)
5/16" (8)
5/16" (8)
5/16" (8)
1:6'
1:6'
1:6'
1:6'
3" (76)
1-5/8" (41)
0.136 (3)
0.177 (4)
2-1/4" (57)
5/16" (8)
1:6'
Weight of ASTM A325 or A490 high strength bolts
Length
Under
Head
Heavy Hex Structural Bolts with Hex Nut in Pounds (Kg) per 100
Inches (mm)
1/2" (13)
5/8" (16)
3/4" (19)
7/8" (22)
1" (25)
1-1/8" (29)
1-1/4" (32)
1-3/8" (35)
1-1/2" (38)
1" (25)
1-1/4" (32)
1-1/2" (38)
1-3/4" (44)
2" (51)
2-1/4" (57)
2-1/2" (64)
2-3/4" (70)
3" (76)
3-1/4" (83)
3-1/2" (89)
3-3/4" (95)
4" (102)
4-1/4" (108)
4-1/2" (114)
4-3/4" (121)
5" (127)
5-1/4" (133)
16.5 (7.48)
17.8 (8.07)
19.2 (8.71)
20.5 (9.29)
21.9 (9.93)
23.3 (10.57)
24.7 (11.2)
26.1 (11.84)
27.4 (12.43)
28.8 (13.06)
30.2 (13.70)
31.6 (14.33)
33 (14.97)
34.3 (15.56)
35.7 (16.19)
37.1 (16.83)
38.5 (17.46)
39.9 (18.10)
29.4 (13.34)
31.1 (14.11)
33.1 (15.01)
35.3 (16.01)
37.4 (16.96)
39.8 (18.05)
41.7 (18.91)
43.9 (19.91)
46.1 (20.91)
48.2 (21.86)
50.4 (22.86)
52.5 (23.81)
54.7 (24.81)
56.9 (25.81)
59 (26.76)
61.2 (27.76)
63.3 (28.71)
65.5 (29.71)
47 (21.32)
49.6 (22.5)
52.2 (23.68)
55.3 (25.08)
58.4 (26.5)
61.6 (27.94)
64.7 (29.35)
67.8 (30.75)
70.9 (32.16)
74 (33.57)
77.1 (34.97)
80.2 (36.38)
83.3 (37.78)
86.4 (39.19)
89.5 (40.6)
92.7 (42.05)
95.8 (43.45)
98.9 (44.86)
74.4 (33.75)
78 (35.38)
81.9 (37.15)
86.1 (39.05)
90.3 (40.96)
94.6 (42.91)
98.8 (44.81)
103 (46.72)
107 (48.53)
111 (50.35)
116 (52.62)
120 (54.43)
124 (56.25)
128 (58.06)
133 (60.33)
137 (62.14)
141 (63.96)
104 (47.17)
109 (49.44)
114 (51.71)
119 (53.98)
124 (56.25)
130 (58.97)
135 (61.23)
141 (63.96)
146 (66.22)
151 (68.49)
157 (71.21)
162 (73.48)
168 (76.2)
173 (78.47)
179 (81.19)
184 (83.46)
190 (86.18)
148 (67.13)
154 (69.85)
160 (72.57)
167 (75.75)
174 (78.93)
181 (82.10)
188 (85.28)
195 (88.45)
202 (91.63)
209 (94.80)
216 (97.98)
223 (101.15)
230 (104.33)
237 (107.50)
244 (110.68)
251 (113.85)
197 (89.36)
205 (92.99)
212 (96.16)
220 (99.79)
229 (103.87)
237 (107.50)
246 (111.58)
255 (115.67)
263 (119.29)
272 (123.38)
280 (127.01)
289 (131.09)
298 (135.17)
306 (138.80)
315 (142.88)
324 (146.96)
261 (118.39)
270 (122.47)
279 (126.55)
290 (131.54)
300 (136.08)
310 (140.61)
321 (145.60)
332 (150.59)
342 (155.13)
353 (160.12)
363 (164.65)
374 (169.64)
384 (174.18)
395 (179.17)
405 (183.70)
333 (151.05)
344 (156.04)
355 (161.03)
366 (166.01)
379 (171.91)
391 (177.35)
403 (182.80)
416 (188.69)
428 (194.14)
441 (200.03)
453 (205.48)
465 (210.92)
478 (216.82)
490 (222.26)
503 (228.16)
5-1/2" (140)
5-3/4" (146)
6" (152)
Per inch
additional
Add
For Each
100 F.W.
Add
For Each
100
Bevel
Washers
Add
41.2 (18.69)
42.6 (19.32)
44 (19.96)
67.7 (30.71)
69.8 (31.66)
71.9 (32.61)
102 (46.27)
105 (47.63)
108 (48.99)
146 (66.22)
150 (68.04)
154 (69.85)
196 (88.9)
201 (91.17)
207 (93.89)
258 (117.03)
265 (120.20)
272 (123.38)
332 (15.59)
341 (154.68)
349 (158.30
416 (188.69)
426 (193.23)
437 (198.22)
515 (233.60)
527 (239.04)
540 (244.94)
5.5 (2.49)
8.6 (3.9)
12.4 (5.62)
16.9 (7.67)
22.1 (10.02)
28 (12.70)
34.4 (15.60)
42.5 (19.28)
49.7 (22.54)
2.1 (0.95)
3.6 (1.63)
4.8 (2.18)
7 (3.18)
9.4 (4.26)
11.3 (5.13)
13.8 (6.26)
16.8 (7.62)
20 (9.07)
23.1 (10.48)
22.4 (10.16)
21 (9.53)
20.2 (9.16)
19.2 (8.71)
34 (15.42)
31.6 (14.33)