ASTM Bolt & Stud Markings
Printable shop wall chart: ASTM Bolt & Stud Markings. Free letter-size PDF to print and post at the counter; 25 x 36 inch poster version available.
| Specification | Marking | Tensile | Use |
|---|---|---|---|
| A307 Grade A | 307A (when marked) | 60 ksi min | General construction |
| A307 Grade B | 307B (when marked) | 60 - 100 ksi | Cast-iron flanged piping |
| A449 Type 1 | 3 radial lines and/or A449 | 120 / 105 / 90 ksi by size | General engineering, anchors |
| A354 BC | BC | 125 ksi min (to 2-1/2 in) | Alloy bolting, anchors |
| A354 BD | BD | 150 ksi min (to 2-1/2 in) | Heavy industrial bolting |
| F3125 A325 | A325 (underlined = Type 3) | 120 ksi min | Structural steel |
| F3125 A490 | A490 (underlined = Type 3) | 150 - 173 ksi | Structural steel |
| F3125 F1852 / F2280 | TC marks, round head | 120 / 150 ksi | Twist-off structural |
| A193 B7 | B7 on stud end | 125 ksi min (to 2-1/2 in) | Flanges, pressure, heat |
| A320 L7 | L7 on stud end | 125 ksi min (to 2-1/2 in) | Cold service |
| F1554 36 / 55 / 105 | End color blue / yellow / red | 58 / 75 / 125 ksi min | Anchor rods |
Always read the maker mark as well. Many A307 parts carry maker ID only.
These tables carry the same figures as the printed sheet below.
The printed sheet
25 x 36 inch poster version
For the full-size shop poster, tell us where to send it.
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Text version of this sheet
307A
307B
A307 GR A
A307 GR B
A449
BC
BD
A325
A490
B7
A354 BC
A354 BD
A325
A490
A193 B7 STUD END
ASTM carbon, alloy and structural bolting · marks and strength
Specification
Marking
Tensile
Use
A307 Grade A
307A (when marked)
60 ksi min
General construction
A307 Grade B
307B (when marked)
60 - 100 ksi
Cast-iron flanged piping
A449 Type 1
3 radial lines and/or A449
120 / 105 / 90 ksi by size
General engineering, anchors
A354 BC
BC
125 ksi min (to 2-1/2 in)
Alloy bolting, anchors
A354 BD
BD
150 ksi min (to 2-1/2 in)
Heavy industrial bolting
F3125 A325
A325 (underlined = Type 3)
120 ksi min
Structural steel
F3125 A490
A490 (underlined = Type 3)
150 - 173 ksi
Structural steel
F3125 F1852 / F2280
TC marks, round head
120 / 150 ksi
Twist-off structural
A193 B7
B7 on stud end
125 ksi min (to 2-1/2 in)
Flanges, pressure, heat
A320 L7
L7 on stud end
125 ksi min (to 2-1/2 in)
Cold service
F1554 36 / 55 / 105
End color blue / yellow / red
58 / 75 / 125 ksi min
Anchor rods
Always read the maker mark as well. Many A307 parts carry maker ID only.
The Fastener App | TheFastenerApp.com
Fastener Guide reference FG-05D69A · thefastenerapp.com/fastener-guide/wall-charts/astm-bolt-and-stud-markings · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
