Bolt lengths come in preferred sizes which generally are in regular production – these are indicated in the table below as X – while those denoted (X) refer to bolts which are available, but not considered to be in regular production. Availability of these bolts should be confirmed by the supplier.

Bolt diameters have been limited to between M 10 and M 24 – while the lengths are between 20 and 130 mm. Bolts outside of this range should be confirmed by the supplier.

Metric Bolts - Preferred Sizes (Lengths)

Bolt Dia. M 10
Gr.4.6
M 10
Gr.8.8
M 12
Gr.4.6
M 12
Gr.8.8
M 16
Gr.4.6
M 16
Gr.8.8
M 20
Gr.4.6
M 20
Gr.8.8
M 24
Gr.4.6
M 24
Gr.8.8
20 X (X)
25 X (X) X (X) X (X)
30 X (X) X (X) X (X)
35 (X) X (X) (X) X (X)
40 X X X X X (X) X (X) (X)
45 X X X X X (X) X (X) (X)
50 X X X X X X X X X
55 X X X X X X X X X X
60 (X) X (X) X (X) X (X) X X X
65 X X X X X X X X (X) X
70 (X) X (X) X X X (X) X X X
75 X X X X X X X X (X) X
80 (X) X (X) X (X) X (X) X X X
85 (X) X (X) X (X) (X) (X) (X) (X) (X)
90 X X X X X X X X (X) X
95 (X) X (X) X (X) X (X) X X X
100 X X X X X X X X (X) X
110 (X) X (X) X (X) X (X) X X X
115 X X X X X X X X (X) X
120 (X) X (X) X (X) X (X) X X X
125 X X X X (X)
130 (X) (X) (X) (X) (X) (X) (X) (X) X (X)

Metric Bolts - Thread Lengths

Length Range M 10 M 12 M 16 M 20 M 24
30 – 125
125 – 200
> 200
26
32
35 – 125
125 -200
> 200
30
36
49
40 – 125
125 -200
> 200
38
44
57
50 – 125
125 -200
> 200
46
52
65
60 – 125
125 -200
> 200
54
60
73

Inch Bolts - Thread Lengths

Length Range Dia. 3/8” Dia. ½” Dia. 5/8” Dia. ¾” Dia. 7/8” Dia. 1”
≤ 6” 1” 1.25” 1.5” 1.75” 2” 2.25”
> 6” 1.25” 1.5” 1.75” 2” 2.25” 2.5”

Inch Bolts - Thread Lengths for A325 and A490 Structural Bolts

Length Range Dia. 3/8” Dia. ½” Dia. 5/8” Dia. ¾” Dia. 7/8” Dia. 1”
All 1.25” 1.375” 1.5” 1.75”

Runout Values for Metric and Inch Series Bolts

The thread runout of a bolt is where the threaded section transitions into the bolt shank.  This area exists beyond where the usable thread stops.

Metric Bolt Dia Metric Run-Out Inch Bolt Dia Inch Run-Out
M 6 2.5
M 8 3
M 10 3.5
M 12 4 ½” 0.19”
M 16 5 5/8” 0.22”
M 20 6 ¾” 0.25”
M 22 7/8” 0.28”
M 24 7 1” 0.31”
M 30 8
M 36 10

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