Mechanical / General Fasteners
Mechanical / Anchor Bolts
With major sectors of US industry now using metric
All new projects are specifying metric anchor bolts
fasteners extensively, there is virtually no fastener that is
(ex, L, J, and U bolts). ASTM F568 gives metric
not obtainable in mm sizes.
chemical and mechanical data for carbon steel anchor
bolts and studs, and references ANSI dimensional
It is hard to imagine a well known manufacturer that
standards. No metric version of A307 is planned.
does not stock, regularly make, or have the capability to
ISO Metric Grades as given in ISO 898 and ASTM
produce metric products.
F568, should be used. Many anchor bolts are made from
Thomas Register has hundreds of firms under Metric
low carbon steel grades, such as ISO classes 4.6, 4.8,
Fasteners, Metric Screws, and Metric Bolts.
IFI offers guides of fastener types and producers. Most
Many firms indicated no minimum order quantity, but
firms in the division 4/5, covering some common
some stated there would be premiums related to set up
construction fasteners, indicate metric ability. IFI Metric
costs for very small orders.
Fastener Standards (530 pg) has technical data, selection
hints. IFI, 216 241 1482
Many pieces of mechanical and electrical equipment
already use both metric and english fasteners.
From material we have seen, it appears preferred
nominal diameters for items such as anchor bolts and
Metric fasteners use M numbers. (M10 x 40 is nominal
threaded rod, would be as shown below.
10 mm diameter, 40 mm length)
Reference individual standards prior to specification.
Some states already stock some metric nuts and bolts.
(ex, Colorado Department of Transportation)
Sizes are given between M5 and M45, as these are
commonly used sizes in construction.
To conserve paper, we will not list the over 150 firms
that stock or produce general metric fasteners. We will
1: = 1st preference, 2: = 2nd preference, etc.
list suppliers only for fasteners often used in
construction, which are not stock items yet.
1: M5 6 8 10 12 16 20 24 30 36 42
The following two charts provide information on
2: M14 18 22 27 33 39 45
fasteners. Our source cautioned that the material is
several years old and is soon to be revised, so standards
3: M5.5 7 9 11 15 17 25 26 28 32 35 38 40
references should be confirmed prior to specification of
Our projects are now using metric socket head cap
screws, set screws, hex bolts, and similar items,
whenever needed, in any quantity. These have been
stock for years and available at about the same cost.