Material Specifications for
Drillco Maxi-Bolt Flush-Mount
Coupling Anchors

The Drillco Maxi-Bolt is available in a variety of materials to match your design requirements:
  • ASTM A193 Grade B7 - High strength carbon alloy steel - fu = 125,000 psi, fy = 105,000 psi
  • ASTM A36 - Mild carbon steel - fy = 36,000 psi
  • ASTM A193 Grade B8 - Class 1 - Type 304 - Stainless steel - strength designated in table
  • ASTM A193 Grade B8 - Class 2 - Type 304 - High strength stainless steel - strength designated in table
  • ASTM A193 Grade B8M - Class 1 - Type 316 - Stainless steel - strength designated in table
  • ASTM A193 Grade B8M - Class 2 - Type 316 - High strength stainless steel - strength designated in table


    • High Strength Steel Maxi-Bolts
    ASTM A193 Grade B7

    A. Conical Nut ASTM A193 Grade B7 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    B. Expansion Sleeve ASTM A513 Type 5 ERW DOM Tubing
    C. Threaded Stud Bolt ASTM A193 Grade B7 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    D. Distance Tube ASTM A513 Type 5 ERW DOM Tubing. Optional to make up proper embedment depth.
    E. Retaining Washer Internal Tooth Washer Used only during anchor setting process.
    F. Coupling Nut ASTM A193 Grade B7 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"


    Mild Steel Maxi-Bolts
    ASTM A36

    A. Conical Nut ASTM A193 Grade B7 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    B. Expansion Sleeve ASTM A513 Type 5 ERW DOM Tubing
    C. Threaded Stud Bolt ASTM A36 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    D. Distance Tube ASTM A513 Type 5 ERW DOM Tubing
    E. Retaining Washer Internal Tooth Washer Used only during anchor setting process.
    F. Coupling Nut ASTM A193 Grade B7 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"


    Stainless Steel Maxi-Bolts
    ASTM A193 Grade B8 - Class 1 - Type 304


    A. Conical Nut ASTM A193 Grade B8 Class 1 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    B. Expansion Sleeve ASTM A213 ERW DOM Tubing
    C. Threaded Stud Bolt ASTM A193 Grade B8 Class 1
    fu = 75,000 psi
    fy = 30,000 psi    		 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    D. Distance Tube ASTM A213 ERW DOM Tubing
    E. Retaining Washer Internal Tooth Washer Used only during anchor setting process.
    F. Coupling Nut ASTM A193 Grade B8 Class 1 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"


    Stainless Steel Maxi-Bolts
    ASTM A193 Grade B8 - Class 2 - Type 304


    A. Conical Nut 3/4" and under ASTM A193
    Grade B8 Class 2
    1" and larger ASTM A564
    Type 630    		 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    B. Expansion Sleeve ASTM A213 ERW DOM Tubing
    C. Threaded Stud Bolt ASTM A193 Grade B8 Class 2

    3/4" and under fu = 125,000 psi
                          fy = 100,000 psi

    1"                   fu = 115,000 psi
                          fy =  80,000 psi

    1 1/4"              fu = 105,000 psi
                           fy =  65,000 psi

    		 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    D. Distance Tube ASTM A213 ERW DOM Tubing
    E. Retaining Washer Internal Tooth Washer Used only during anchor setting process.
    F. Coupling Nut 3/4" and under ASTM A193
    Grade B8 Class 2
    1" and larger ASTM A564
    Type 630    		 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"


    Stainless Steel Maxi-Bolts
    ASTM A193 Grade B8M - Class 1 - Type 316


    A. Conical Nut ASTM A193 Grade B8M Class 1 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    B. Expansion Sleeve ASTM A213 ERW DOM Tubing
    C. Threaded Stud Bolt ASTM A193 Grade B8M Class 1
    fu = 75,000 psi
    fy = 30,000 psi    		 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    D. Distance Tube ASTM A213 ERW DOM Tubing
    E. Retaining Washer Internal Tooth Washer Used only during anchor setting process.
    F. Coupling Nut ASTM A193 Grade B8M Class 1 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"


    Stainless Steel Maxi-Bolts
    ASTM A193 Grade B8M - Class 2 - Type 316


    A. Conical Nut 3/4" and under ASTM A193
    Grade B8M Class 2
    1" and larger A564 Type 630    		 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    B. Expansion Sleeve ASTM A213 ERW DOM Tubing
    C. Threaded Stud Bolt ASTM A193 Grade B8M Class 2

    3/4" and under fu = 110,000 psi
                          fy =  95,000 psi

    1"                   fu = 100,000 psi
                          fy =  80,000 psi

    1 1/4"              fu =  95,000 psi
                           fy =  65,000 psi

    		 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"
    D. Distance Tube ASTM A213 ERW DOM Tubing
    E. Retaining Washer Internal Tooth Washer Used only during anchor setting process.
    F. Coupling Nut 3/4" and under ASTM A193
    Grade B8M Class 2
    1" and larger A564 Type 630    		 UNC Series Class 2B fit for 1/4", 3/8", 1/2", 5/8", 3/4", and 1"
    UN 8 Pitch Series Class 2B fit for 1 1/4"

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