SAE J429 (Revised JAN1999), Table 1
No radial lines. Low or medium carbon steel, not necessarily heat treated.
| Size range | Proof | Yield min | Tensile min | Core hardness |
|---|---|---|---|---|
| 1/4 in through 1-1/2 in | 33 ksi (228 MPa) | 36 ksi (248 MPa) | 60 ksi (414 MPa) | Rockwell B70 to B100 |
Inch grades are published in ksi and metric classes in MPa. The other column on every row is a conversion at 1 ksi = 6.894757 MPa, rounded to the nearest whole unit - it is arithmetic on the published figure, not a second published figure.
No grade marking. The head carries the manufacturer's identifier and nothing else.
An unmarked head is not evidence of Grade 1. Grades 1, 2 and 4 all carry no marking, and so does a great deal of imported hardware that meets nothing at all. An unmarked bolt tells you only that it is not Grade 5, 7 or 8.
Count the radial lines and add two. That rule identifies exactly two grades - SAE Grade 5 with three lines and SAE Grade 8 with six - and it fails everywhere else. Grades 1, 2 and 4 carry no marking at all, so an unmarked head is not evidence of Grade 2; it is evidence of nothing, and unmarked hardware that meets no standard looks exactly the same. ASTM grades are stamped with the specification (A325, A490, BC, BD, 307A) rather than lines, and metric classes are stamped with the class number. Four marking systems share one bin.
Low or medium carbon steel, not necessarily heat treated. General low-load hardware where nothing is specified.
J429 Table 1 gives the yield as a yield POINT here rather than a 0.2 percent offset yield strength - footnote 6 of the table.
Over 1/4 in through 1-1/2 in, SAE Grade 1 requires a minimum tensile strength of 60 ksi (414 MPa), a minimum yield of 36 ksi (248 MPa) and a proof load of 33 ksi (228 MPa).
No grade marking. The head carries the manufacturer's identifier and nothing else.
Low or medium carbon steel, not necessarily heat treated. General low-load hardware where nothing is specified.
Twenty-two grades and classes: the SAE J429 inch grades, five ASTM specifications and the ISO 898-1 property classes. It is not every grade in circulation. Stainless classes (ISO 3506 A2 and A4, ASTM F593), the ASTM A193 and A320 high and low temperature grades, ASTM F1554 anchor rod grades and SAE grades 3, 5.1 and 8.1 are not carried here.
Dimensions are as defined by SAE J429 (Revised JAN1999), Table 1. This site is an independent reference and is not affiliated with, endorsed by or approved by any standards body.
Every value on this page was cross-checked against 5 independent published sources:
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