SAE J429, legacy grade - see the note below
Marking not verified to two sources. Medium carbon alloy steel, quenched and tempered, roll threaded after heat treatment.
| Size range | Proof | Yield min | Tensile min | Core hardness |
|---|---|---|---|---|
| 1/4 in through 1-1/2 in | 105 ksi (724 MPa) | 115 ksi (793 MPa) | 133 ksi (917 MPa) | not published |
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.
Not described here. None of the charts cross-checked for this page describes the Grade 7 head marking in words, so no description is given.
Grade 7 sits between Grade 5 and Grade 8 in strength. Because it is not in the current revision of J429, a bolt sold as Grade 7 should be checked against the supplier's own certification rather than against this table.
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.
Medium carbon alloy steel, quenched and tempered, roll threaded after heat treatment. Legacy assemblies; largely displaced by Grade 8.
SAE J429 as revised in January 1999 does NOT list Grade 7. Its Table 1 covers grades 1, 2, 4, 5, 5.1, 5.2, 8, 8.1 and 8.2 and nothing else. The figures above come from four fastener charts that still publish the grade; they are given because Grade 7 bolts are still sold and still asked about, not because the current standard defines them.
No core hardness range is published for Grade 7 by any of the charts cross-checked here, so none is printed.
Over 1/4 in through 1-1/2 in, SAE Grade 7 requires a minimum tensile strength of 133 ksi (917 MPa), a minimum yield of 115 ksi (793 MPa) and a proof load of 105 ksi (724 MPa).
Not described here. None of the charts cross-checked for this page describes the Grade 7 head marking in words, so no description is given.
Medium carbon alloy steel, quenched and tempered, roll threaded after heat treatment. Legacy assemblies; largely displaced by Grade 8.
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, legacy grade - see the note below. 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 4 independent published sources:
Whether SAE J429 still defines Grade 7: Grade 7 is not in Table 1 (j429-1999) against Grade 7 listed at 105 / 115 / 133 ksi (grades-wikipedia) against Grade 7 listed at 105 / 115 / 133 ksi (grades-americanfastener). Both are true. The January 1999 revision of J429 lists grades 1, 2, 4, 5, 5.1, 5.2, 8, 8.1 and 8.2 and no Grade 7, while four fastener charts still publish Grade 7 figures. The Grade 7 page here prints those figures and says plainly that the current standard does not define them.
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