90° Anchor Bolt

Custom bent anchor bolts are typically specified using the following dimensions:

Diameter (D) × Length (L) × Leg Distance (C) × Thread Length (T)

For example, a 1″ × 36″ × 6″ × 6″ bolt has a 1-inch diameter, 36-inch overall length, a 6-inch hook (bend leg), and 6 inches of thread at the exposed end.

The bent portion (also known as the leg or hook) increases the mechanical bond between the bolt and the concrete foundation. When tensile forces are applied to the exposed end, the bend provides anchorage resistance, preventing the bolt from pulling out. This makes bent anchor bolts ideal for tension and shear-critical applications such as steel column base plates and light pole installations.

Portland Bolt manufactures custom bent anchor bolts from ½″ through 4″ in diameter, in virtually any ASTM specification required by the project, including:

• ASTM F1554 Grades 36, 55, and 105
• ASTM A307 Grade C* (withdrawn in 2007, but still supplied when specified)
• ASTM A449, A354, and AASHTO M314
  Bolts can be supplied plain finish, hot-dip galvanized, or in stainless steel.

All processes—including cutting, threading, bending, and galvanizing—are performed in-house for full quality control and fast turnaround.

Yes. Portland Bolt maintains a stock inventory of commonly used 90° anchor bolts in standard grades such as F1554 Grade 36, F1554 Grade 55, and A307 Grade C*. 

Stock bolts are available for immediate shipment and are widely used in infrastructure applications like light poles, traffic signal supports, and bridge railings.

*Although ASTM A307 Grade C was withdrawn in 2007, Portland Bolt continues to provide bolts to this specification upon customer request.

Bent anchor bolts differ from other configurations by their mechanical anchoring method:

• Bent (90°) Anchor Bolt: Uses a bent leg to resist pullout.
• Headed Anchor Bolt: Uses a forged hex, heavy hex, or square head embedded in concrete for pullout resistance.
• Anchor Rod: A straight, threaded rod often paired with a nut and washer to provide anchorage.
• Swedged Rod: Has a deformed surface (swedged pattern) to mechanically bond with concrete.

Each design offers unique performance and installation advantages depending on the load type, structure, and embedment depth.

For 90° bent anchor bolts, length (L) is measured from the inside of the bend to the end of the threaded portion. This differs from headed bolts, which are measured from the underside of the head to the threaded end. This distinction ensures consistency in manufacturing and proper fit during installation.

Portland Bolt’s in-house hot-dip galvanizing ensures complete process control, reduced lead times, and compliance with ASTM F2329 galvanizing standards. Performing galvanizing onsite also prevents thread damage, ensures uniform coating thickness, and maintains close fitment for nuts and washers.

When ordering or specifying bent anchor bolts:

• Include diameter, length, bend (leg) dimension, and thread length
• Specify the ASTM grade and finish (plain, galvanized, or stainless)
• Confirm thread pitch and tolerance class if special fit is required
• Note any custom tolerances or fabrication requirements beyond ASTM defaults

Providing this information up front ensures accurate fabrication and reduces installation delays.

Yes. In addition to 90° bent anchors, Portland Bolt manufactures headed anchor bolts in diameters from ½″ to 2½″, available with hex, heavy hex, or square forged heads.

Unlike bent anchors, headed anchor bolts rely on the forged head (not a bend) for pullout resistance. It’s important to note that a threaded rod with a welded nut is not equivalent to a forged headed bolt and should not be substituted without engineer approval.