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Material Specifications for Drillco Maxi-Bolts

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/ASTM A519 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/ASTM A519 ERW DOM Tubing
    E. Washer ASTM A325 Hardened Round Flat Washer
    F. Heavy Hex Nut ASTM A194 Grade 2H 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/ASTM A519 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/ASTM A519 ERW DOM Tubing
    E. Washer ASTM A325 Hardened Round Flat Washer
    F. Heavy Hex Nut ASTM A194 Grade 2H 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 3/4" and under - ASTM A193 Grade B8 Class 1
    1" and 1 1/4" - ASTM A564 Condition H1150
    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 AISI Type 304 Stainless Steel 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 AISI Type 304 Stainless Steel Tubing
    E. Washer Type 18/8 Stainless Steel Washer
    F. Heavy Hex Nut ASTM A194 Grade B8 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 1 1/4" - ASTM A564 Condition H1150
    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 AISI Type 304 Stainless Steel 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 AISI Type 304 Stainless Steel Tubing
    E. Washer Type 18/8 Stainless Steel Washer
    F. Heavy Hex Nut ASTM A194 Grade B8
    Strain Hardened
    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 3/4" and under - ASTM A193
    Grade B8M Class 1
    1" and 1 1/4" - ASTM A564
    Condition H1150
    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 AISI Type 316 Stainless Steel 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 AISI Type 316 Stainless Steel Tubing
    E. Washer Type 18/8 Stainless Steel Washer
    F. Heavy Hex Nut ASTM A194 Grade B8M 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 1 1/4" ASTM A564 Condition H1150
    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 AISI Type 316 Stainless Steel 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 AISI Type 316 Stainless Steel Tubing
    E. Washer Type 18/8 Stainless Steel Washer
    F. Heavy Hex Nut ASTM A194 Grade B8M
    Strain Hardened
    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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