SAE J429 (Revised JAN1999), Table 1
No marking (studs). Medium carbon steel, cold drawn.
| Size range | Proof | Yield min | Tensile min | Core hardness |
|---|---|---|---|---|
| 1/4 in through 1-1/2 in | 65 ksi (448 MPa) | 100 ksi (689 MPa) | 115 ksi (793 MPa) | Rockwell C22 to C32 |
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.
None. J429 applies Grade 4 to studs only, and studs are not marked at all under this standard.
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 steel, cold drawn. Cold-drawn studs, mostly in older equipment.
Studs only. J429 lists no Grade 4 bolt or screw, so a bolt sold as Grade 4 is not covered by this table.
One of the cross-checked charts leaves the proof load blank for this grade; the 65 ksi figure is from J429 Table 1 itself and one other chart.
Over 1/4 in through 1-1/2 in, SAE Grade 4 requires a minimum tensile strength of 115 ksi (793 MPa), a minimum yield of 100 ksi (689 MPa) and a proof load of 65 ksi (448 MPa).
No grade marking. The head carries the manufacturer's identifier and nothing else.
Medium carbon steel, cold drawn. Cold-drawn studs, mostly in older equipment.
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 4 independent published sources:
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