SQUARE NECK CARRIAGE BOLT

BASIC
SCREW
DIAMETER
E
A
H
O
P
Q
R
BODY
HEAD
HEAD
SQUARE
SQUARE
RADIUS
FILLET
DIAMETER
DIAMETER
HEIGHT
WIDTH
DEPTH
SQUARE
RADIUS
max
min
max
min
max
min
max
min
max
min
max
max
10
0.1900
0.199
0.182
0.469
0.438
0.114
0.094
0.199
0.185
0.125
0.094
0.031
0.031
1/4
0.2500
0.260
0.237
0.594
0.563
0.145
0.125
0.260
0.245
0.156
0.125
0.031
0.031
5/16
0.3125
0.324
0.298
0.719
0.688
0.176
0.156
0.324
0.307
0.187
0.156
0.031
0.031
3/8
0.3750
0.388
0.360
0.844
0.782
0.208
0.188
0.388
0.368
0.219
0.188
0.047
0.031
7/16
0.4375
0.452
0.421
0.969
0.907
0.239
0.219
0.452
0.431
0.250
0.219
0.047
0.031
1/2
0.5000
0.515
0.483
1.094
1.032
0.270
0.250
0.515
0.492
0.281
0.250
0.047
0.031
5/8
0.6250
0.642
0.605
1.344
1.219
0.344
0.313
0.642
0.616
0.344
0.313
0.078
0.062
3/4
0.7500
0.768
0.729
1.594
1.469
0.406
0.375
0.768
0.741
0.406
0.375
0.078
0.062
7/8
0.8750
0.895
0.852
1.844
1.719
0.469
0.438
0.895
0.865
0.469
0.438
0.094
0.062
1"
1.0000
1.022
0.976
2.094
1.969
0.531
0.500
1.022
0.990
0.531
0.500
0.094
0.062


Round head carriage bolts are also referred to as round head square neck carriage bolts. The dimensions listed above refer only to the standard neck bolts. If the dimensions for your requirement are similar but do not correspond directly with those above, you may need a round head short neck bolt. Dimensions and other information regarding this type of bolt are available from your sales representative. Step bolts look similar to carriage bolts. Dimensions vary slightly and are referenced below.

STEP BOLTS

BASIC
SCREW
DIAMETER
E
A
H
O
P
Q
R
BODY
HEAD
HEAD
SQUARE
SQUARE
RADIUS
FILLET
DIAMETER
DIAMETER
HEIGHT
WIDTH
DEPTH
SQUARE
RADIUS
max
min
max
min
max
min
max
min
max
min
max
max
10
0.1900
0.199
0.182
0.656
0.625
0.114
0.094
0.199
0.185
0.125
0.094
0.031
0.031
1/4
0.2500
0.260
0.237
0.844
0.813
0.145
0.125
0.260
0.245
0.156
0.125
0.031
0.031
5/16
0.3125
0.324
0.298
1.031
1.000
0.176
0.156
0.324
0.307
0.187
0.156
0.031
0.031
3/8
0.3750
0.388
0.360
1.219
1.188
0.208
0.188
0.388
0.368
0.219
0.188
0.047
0.031
7/16
0.4375
0.452
0.421
1.406
1.375
0.239
0.219
0.452
0.431
0.250
0.219
0.047
0.031
1/2
0.5000
0.515
0.483
1.594
1.563
0.270
0.250
0.515
0.492
0.281
0.250
0.047
0.031
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