Tension and Shear Allowable Loads
for Drillco Maxi-Bolt Anchors

The following tables give tension and shear working stress design load allowables. These loads were calculated by reducing the ultimate strength design method values for each material type by a factor of 1.7. You may therefore increase these load allowables by 1.7 if you are employing ultimate strength design.

  • Load Allowables for A193 Grade B7 Material
  • Load Allowables for A36 Material
  • Load Allowables for A193 B8 (Type 304) and B8M (Type 316) - Class 1 Stainless Steel Material
  • Load Allowables for A193 B8 (Type 304) - Class 2 Stainless Steel Material
  • Load Allowables for A193 B8M (Type 316) - Class 2 Stainless Steel Material


  • Allowable Loads For Drillco Maxi-Bolts
    with ASTM A193 Grade B7 Stud Bolts

    Anchor Diameter
    (Inches)
    Tension
    (Pounds)
    Shear Case 1
    (Pounds)
    Shear Case 2
    (Pounds)
    1/4 1,600 830 1,060
    3/8 3,900 2,025 2,580
    1/2 7,105 3,690 4,695
    5/8 11,305 5,870 7,475
    3/4 16,710 8,680 11,045
    1 30,315 15,750 20,040
    1 1/4 50,015 25,980 33,065
    NOTES:
    1. Shear Case 1 applicable for grouted plates. Shear Case 2 applicable for plates in contact with concrete surface.
    2. Use straight line interaction for combined tension and shear loading.
    3. All load allowables are premised on the concrete's ability to develop 100 percent of the stud bolt's minimum ultimate capacity. Applicable code provisions should be employed to determine the design strength of overlying concrete for particular anchor spacing and embedment combinations. Since most codes base the design strength of concrete on the combined projected areas of all bolts in a given pattern, Drillco has provided a Projected Concrete Area Calculator to assist in concrete strength calculations. Note that codes differ on the question of permitting reduced load allowables in cases where the design strength of concrete is less than the bolt's specified minimum ultimate strength.
    4. The allowable loads noted in the above table may be assigned to each anchor in a multiple-anchor attachment. A single anchor used to anchor an attachment shall be designed for one half of the allowable loads noted. A single anchor is considered to be an anchor with no capability to redistribute its load to adjacent anchors.


    Allowable Loads For Drillco Maxi-Bolts
    with ASTM A36 Stud Bolts

    Anchor Diameter
    (Inches)
    Tension
    (Pounds)
    Shear Case 1
    (Pounds)
    Shear Case 2
    (Pounds)
    3/8 1,335 690 880
    1/2 2,435 1,265 1,610
    5/8 3,875 2,010 2,560
    3/4 5,725 2,975 3,785
    1 10,390 5,395 6,870
    1 1/4 17,150 8,910 11,340
    NOTES:
    1. Shear Case 1 applicable for grouted plates. Shear Case 2 applicable for plates in contact with concrete surface.
    2. Use straight line interaction for combined tension and shear loading.
    3. All load allowables are premised on the concrete's ability to develop 100 percent of the stud bolt's minimum ultimate capacity. Applicable code provisions should be employed to determine the design strength of overlying concrete for particular anchor spacing and embedment combinations. Since most codes base the design strength of concrete on the combined projected areas of all bolts in a given pattern, Drillco has provided a Projected Concrete Area Calculator to assist in concrete strength calculations. Note that codes differ on the question of permitting reduced load allowables in cases where the design strength of concrete is less than the bolt's specified minimum ultimate strength.
    4. The allowable loads noted in the above table may be assigned to each anchor in a multiple-anchor attachment. A single anchor used to anchor an attachment shall be designed for one half of the allowable loads noted. A single anchor is considered to be an anchor with no capability to redistribute its load to adjacent anchors.


    Allowable Loads For Drillco Maxi-Bolts
    with ASTM A193 Grade B8 (Type 304)
    and B8M (Type 316)
    Class 1 Stainless Stud Bolts

    Anchor Diameter
    (Inches)
    Tension
    (Pounds)
    Shear Case 1
    (Pounds)
    Shear Case 2
    (Pounds)
    3/8 1,105 575 730
    1/2 2,025 1,050 1,340
    5/8 3,230 1,675 2,135
    3/4 4,780 2,480 3,160
    1 8,655 4,495 5,720
    1 1/4 14,290 7,420 9,445
    NOTES:
    1. Shear Case 1 applicable for grouted plates. Shear Case 2 applicable for plates in contact with concrete surface.
    2. Use straight line interaction for combined tension and shear loading.
    3. All load allowables are premised on the concrete's ability to develop 100 percent of the stud bolt's minimum ultimate capacity. Applicable code provisions should be employed to determine the design strength of overlying concrete for particular anchor spacing and embedment combinations. Since most codes base the design strength of concrete on the combined projected areas of all bolts in a given pattern, Drillco has provided a Projected Concrete Area Calculator to assist in concrete strength calculations. Note that codes differ on the question of permitting reduced load allowables in cases where the design strength of concrete is less than the bolt's specified minimum ultimate strength.
    4. The allowable loads noted in the above table may be assigned to each anchor in a multiple-anchor attachment. A single anchor used to anchor an attachment shall be designed for one half of the allowable loads noted. A single anchor is considered to be an anchor with no capability to redistribute its load to adjacent anchors.


    Allowable Loads For Drillco Maxi-Bolts
    with ASTM A193 Grade B8 (Type 304)
    Class 2 Stainless Stud Bolts

    Anchor Diameter
    (Inches)
    Tension
    (Pounds)
    Shear Case 1
    (Pounds)
    Shear Case 2
    (Pounds)
    3/8 3,710 1,925 2,455
    1/2 6,765 3,510 4,470
    5/8 10,765 5,590 7,115
    3/4 15,910 8,265 10,515
    1 23,095 12,000 15,265
    1 1/4 30,960 16,060 20,465
    NOTES:
    1. Shear Case 1 applicable for grouted plates. Shear Case 2 applicable for plates in contact with concrete surface.
    2. Use straight line interaction for combined tension and shear loading.
    3. All load allowables are premised on the concrete's ability to develop 100 percent of the stud bolt's minimum ultimate capacity. Applicable code provisions should be employed to determine the design strength of overlying concrete for particular anchor spacing and embedment combinations. Since most codes base the design strength of concrete on the combined projected areas of all bolts in a given pattern, Drillco has provided a Projected Concrete Area Calculator to assist in concrete strength calculations. Note that codes differ on the question of permitting reduced load allowables in cases where the design strength of concrete is less than the bolt's specified minimum ultimate strength.
    4. The allowable loads noted in the above table may be assigned to each anchor in a multiple-anchor attachment. A single anchor used to anchor an attachment shall be designed for one half of the allowable loads noted. A single anchor is considered to be an anchor with no capability to redistribute its load to adjacent anchors.


    Allowable Loads For Drillco Maxi-Bolts
    with ASTM A193 Grade B8M (Type 316)
    Class 2 Stainless Stud Bolts

    Anchor Diameter
    (Inches)
    Tension
    (Pounds)
    Shear Case 1
    (Pounds)
    Shear Case 2
    (Pounds)
    3/8 3,525 1,830 2,330
    1/2 6,425 3,335 4,245
    5/8 10,225 5,310 6,760
    3/4 16,115 7,850 9,990
    1 23,095 12,000 15,265
    1 1/4 30,960 16,080 20,465
    NOTES:
    1. Shear Case 1 applicable for grouted plates. Shear Case 2 applicable for plates in contact with concrete surface.
    2. Use straight line interaction for combined tension and shear loading.
    3. All load allowables are premised on the concrete's ability to develop 100 percent of the stud bolt's minimum ultimate capacity. Applicable code provisions should be employed to determine the design strength of overlying concrete for particular anchor spacing and embedment combinations. Since most codes base the design strength of concrete on the combined projected areas of all bolts in a given pattern, Drillco has provided a Projected Concrete Area Calculator to assist in concrete strength calculations. Note that codes differ on the question of permitting reduced load allowables in cases where the design strength of concrete is less than the bolt's specified minimum ultimate strength.
    4. The allowable loads noted in the above table may be assigned to each anchor in a multiple-anchor attachment. A single anchor used to anchor an attachment shall be designed for one half of the allowable loads noted. A single anchor is considered to be an anchor with no capability to redistribute its load to adjacent anchors.





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