What are the tolerances for F1554 anchor bolts?
In our Live Chat, numerous customers have asked us about tolerances under the F1554 specification relating to things like diameter, length, straightness, and many other parameters. While a customer always has the option of specifying a particular set of tolerances they may require for any bolt, what are the default tolerances for anchor bolts under the ASTM F1554 specification? Let’s take a look.
Section 10 of the specification covers dimensional tolerances. Here is the breakdown for each dimensional tolerance that is given in the specification.
- Body Diameter (if rolled threads) – not less than the minimum pitch diameter.
- Body Diameter (if cut threads) – not less than the minimum major diameter.
- Bend Section (thickness of the steel in the area that is bent)- shall have a cross section not less than 90% of the area of straight portions.
- Length is measured from the underside of the head to the end of the threads for headed bolts or from the inside of the bend to the end of the threads for bent bolts. It is broken down into two categories of length.
- For bolts 24” or shorter the length tolerance is ± 1/2”.
- For bolts longer than 24” the length tolerance is ± 1”.
- Hook length (short leg) – ± 10% of the speciﬁed hook length, or ± 1⁄2 in., whichever is greater.
- Bend Angle—The bend angle of hooks shall not vary from that speciﬁed by more than ± 5°
- Thread Dimensions – Unless otherwise specified should be Uniﬁed Coarse Thread Series per ANSI/ASME B1.1 and have either Class 1A or 2A tolerances.
- Thread Length—+1.0 in./−0.00 in. from the length specified
This is the complete list of tolerances that are defined within the ASTM F1554 specification. If a customer desires a tolerance beyond the stated values listed above, or, if they wish to have anchor bolts meet a tolerance that is undefined in the specification, the customer would need to explicitly define the values they are requiring to the manufacturer at the time of inquiry.