F1554 Answers

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F1554 grade designations, grade 36, grade 55, and grade 105, correspond to their respective minimum tensile strengths in ksi (thousands of pounds per square inch).

Answer: False

The three grades (36, 55, and 105) correspond to the minimum yield strengths of the anchor bolts, not the minimum tensile strengths. Yield strength is the stress at which material strain changes from elastic deformation to plastic deformation, causing it to deform permanently. Tensile strength is the maximum stress a fastener can withstand before breaking.

You said: False

This specification allows which type of bolt configuration(s):

Answer: All of the above

Under this specification, all of the above configurations are allowed. This allows for greater design flexibility. See the configuration page for more details.

You said: Straight Rods

A193 grade B7 material can always be substituted for F1554 grade 55.

Answer: False

Be skeptical of fastener distributors and manufacturers with limited manufacturing capabilities who attempt to substitute 1045 round bar or even A193 grade B7 material for F1554 grade 55. These materials and other grades of steel may exceed the minimum tensile and yield strength requirements of the F1554 grade 55 specification, but will usually not meet the elongation and/or reduction of area requirements. Grade 55 round bar is not commonly available through local steel warehouses. Portland Bolt buys mill runs of round bar and stocks this material for immediate processing.

You said: True

Which thread pitch is required (unless otherwise specified) for ASTM F1554 anchor bolts?

Answer: Coarse Thread Series (UNC/UNRC)

You said: Fine Thread Series (UNF/UNRF)

F1554 grade 36 replaced which ASTM specification?

Answer: A307 grade C

Many engineers still specify A307 grade C and Portland Bolt still manufactures and certifies product to this specification. However, ASTM eliminated A307 grade C in August of 2007. On new projects consider specifying F1554 grade 36 for mild steel anchor bolts.

You said: A325

What is the difference between F1554 grade 55 and 1045 steel?

Answer: Grade 55 is an anchor bolt specification with complete product, mechanical and chemical requirements. 1045 is a raw material grade of round bar with general strength properties.

You said: Grade 55 is an anchor bolt specification with complete product, mechanical and chemical requirements. 1045 is a raw material grade of round bar with general strength properties.

What year was ASTM F1554 first introduced?

Answer: 1994

Even though it has been around for over 14 years, this specification has only recently been widely adopted.

You said: 2000

The AASHTO equivalent specification to ASTM F1554 is:

Answer: M-314

The content of the AASHTO (American Association of State Highway and Transportation Officials) and ASTM standards are identical. Some Departments of Transportation specify the metric grade equivalents (248, 380, and 724) which correspond to the minimum yield strengths in megapascal (MPa).

You said: M-314

It is acceptable to weld to all three grades of F1554 anchor bolts (36, 55, and 105)?

Answer: False

Weldability depends on the grade. F1554 grade 36 is mild steel and is weldable. Grade 55 is a modified mild steel and is weldable, provided it meets the weldability requirements as described in Supplementary Requirement S1 of the F1554 specification. Grade 55 material that does not meet the S1 carbon equivalency parameters is not weldable. Grade 105 is not weldable since the heat generated during welding could alter the mechanical properties of the medium carbon alloy quenched and tempered material. See more on the FAQ page.

You said: False

The F1554 specification requires the ends of anchor bolts projecting from the concrete to be permanently stamped with the manufacturer’s logo and the grade symbol, while color coding is a supplementary requirement.

Answer: False

Color coding is the requirement, while permanent stamping with manufacturer’s logo and/or grade symbol are supplemental requirements.

You said: False

When a washer is used with F1554 anchor bolts, all three grades (36, 55, and 105) require an F436 hard washer.

Answer: True

Follow this link for recommended nuts and washers: Recommended Nuts and Washers

You said: True

Only F1554 grades 36 and 55 can be hot-dip galvanized, while grade 105 cannot be galvanized due to the heat from the galvanizing operation potentially altering the mechanical properties of the bolt.

Answer: False

All three grades of F1554 (grade 36, 55, and 105) can be galvanized. Both hot-dip galvanizing per ASTM F2329 and mechanical galvanizing per ASTM B695, class 50 are acceptable. Portland Bolt operates an in-house, state-of-the-art hot dip galvanizing line designed specifically for threaded fasteners.

You said: False

Commercially available mild steel all thread rod will usually not meet the requirements of F1554 grade 36.

Answer: True

This question is answered in detail by following this link to Portland Bolt’s main website: F1554 Grade 36 All Thread Rod

You said: False

All three grades of F1554 anchor bolts (36, 55, and 105) range in diameter from 1/2″ through 4″.

Answer: False

Both grade 36 and 55 allow diameters from 1/2″ through 4″, while grade 105 only goes from 1/2″ through 3″.

You said: True