Tension and Shear Allowable Load Tables
Embedment and Center to Center Spacing Tables
and
Tool Dimension and Tolerance Table
for Drillco Maxi-Bolt Anchors

Notice: Unless otherwise noted, all load and design values presented herein are based on the provisions of ACI 349-97 or earlier. Design guidance based on ACI 318-05 and ACI 349-06 is being prepared and will appear here shortly. In the mean time you may wish to review the results of cracked concrete testing performed in accordance with ACI 355.2 as called for in the new codes.

Tension and Shear Allowable Load Tables

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

  • Embedment, Edge Distance and Center to Center Spacing Tables

    The following tables give embedment, edge distance and center to center spacing values for the various material types.

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

  • Tool Dimentsion and Tolerance Table

    Maxi-Bolts of all material types utilize identical tooling diameters and tolerances. They are given in the following table.

  • Tool Dimentsions and Tolerances.





  • 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.



    Embedment and Center-to-Center Spacing Requirements
    for Drillco Maxi-Bolts with ASTM A193 Grade B7 Stud Bolts
    with up to six bolts in a rectangular pattern

    ANCHOR PART NO.
    ANCHOR
    STUD
    DIAMETER
    (Inches)
    MAXIMUM
    ATTACHMENT
    THICKNESS
    (Inches)
    EMBEDMENT
    (Inches)
    3000 psi CONCRETE
    4000 psi CONCRETE
    5000 psi CONCRETE
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    MB-250-4 1/4-2
    MB-250-4 1/4-2 3/4
    1/4
    1/4
    1.50
    1.00
    2
    2 3/4
    *4.50
     6.00
    4.50
    4.50
    *4.50
     5.00
    4.25
    4.25
    *4.50
     4.50
    4.00
    4.00
    MB-375-6-3 1/2
    MB-375-6-4 1/2
    3/8
    3/8
    2.50
    1.50
    3 1/2
    4 1/2
    *7.50
     9.00
    6.75
    6.75
    *7.50
     7.50
    6.25
    6.25
    *7.50
     6.50
    6.00
    6.00
    MB-500-8 1/4-6
    MB-500-11 1/4-8
    MB-500-13 1/4-10
    1/2
    1/2
    1/2
    1.00
    2.00
    2.00
    6
    8
    10
    12.50
     8.50
     6.00
    8.75
    8.75
    8.75
    10.00
     7.00
    4.50
    8.25
    8.25
    8.25
    9.00
    6.00
    4.00
    7.75
    7.75
    7.75
    MB-625-10-7 1/2
    MB-625-13-9 1/2
    MB-625-16-12
    5/8
    5/8
    5/8
    1.25
    2.25
    2.75
    7 1/2
    9 1/2
    12
    16.00
     11.50
     8.00
    11.00
    11.00
    11.00
    13.00
     9.50
     6.50
    10.25
    10.25
    10.25
    11.50
    8.50
    5.50
    9.75
    9.75
    9.75
    MB-750-13 1/2-9 1/4
    MB-750-16 1/2-11 1/2
    MB-750-18 1/2-13
    3/4
    3/4
    3/4
    2.75
    3.50
    4.00
    9 1/4
    11 1/2
    13
    18.50
     14.00
     12.00
    13.00
    13.00
    13.00
    15.00
     12.00
     10.00
    12.25
    12.25
    12.25
    13.50
    10.50
    8.50
    11.75
    11.75
    11.75
    MB-1000-16 1/2-12 1/2
    MB-1000-22 1/2-16 1/2
    MB-1000-26 1/2-20 1/2
    1
    1
    1
    2.00
    3.50
    3.50
    12 1/2
    16 1/2
    20 1/2
    24.50
     17.00
     12.00
    17.50
    17.50
    17.50
    20.00
    14.50
     9.50
    16.25
    16.25
    16.25
    18.00
    12.50
    7.50
    15.50
    15.50
    15.50
    MB-1250-20-16
    MB-1250-30-23
    MB-1250-37-29 1/2
    1 1/4
    1 1/4
    1 1/4
    1.75
    5.00
    5.50
    16
    23
    29 1/2
    31.50
     19.50
     12.00
    22.00
    22.00
    22.00
    26.00
    16.00
     8.50
    20.50
    20.50
    20.50
    23.00
    14.00
     6.50
    19.25
    19.25
    19.25

    *Recommendation based on independent laboratory testing. All other embedment and center to center recommendations based on design by analysis provisions of ACI 349. Appendix B.

    NOTES:

    1. Maximum attachment thickness is based on torque tensioning of anchor. Any lesser attachment thickness may be used. Where the anchor is to be hydraulically tensioned, maximum attachment thicknesses will be reduced by one stud diameter.
    2. Consideration of stress area reduction for limited concrete depth is not reflected in the above table. Minimum concrete depth = anchor embedment plus (center-to-center spacing/2).
    3. Maxi-Bolt part numbers are specified as follows: MB-Diameter Series Number --- Overall Length-Sleeve Length (combined expansion sleeve and distance tube lengths).
    4. Minimum edge distances quoted are for shear or combined tension and shear. For tension loading, edge distance may be reduced to 75 percent of given value.
    5. Allowable values are limited to a maximum of six bolts in a two-row, three-column, or three-row, two-column arrangement. Allowable values may also be used for anchors placed in a single line and separated from other anchor lines by a minimum distance of two times the anchor embedment length.
    6. In-place embedment length is determined by subtracting the over-all length (second number shown in Anchor Part No. column) from the exposed projection.




    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.



    Embedment and Center-to-Center Spacing Requirements
    for Drillco Maxi-Bolts with ASTM A36 Stud Bolts
    with up to six bolts in a rectangular pattern

    ANCHOR PART NO.
    ANCHOR
    STUD
    DIAMETER
    (Inches)
    MAXIMUM
    ATTACHMENT
    THICKNESS
    (Inches)
    EMBEDMENT
    (Inches)
    3000 psi CONCRETE
    4000 psi CONCRETE
    5000 psi CONCRETE
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    MBA36-375-6-3 1/4 3/8 2 3 1/4 6.00 4.50 6.00 4.25 4.00 4.00
    MBA36-375-6-4 1/2 3/8 1 4 1/2 4.00 4.50 4.00 4.25 4.00 4.00
    MBA36-500-7-4 1/2 1/2 1 3/4 4 1/2 8.00 6.00 6.00 5.75 6.00 5.25
    MBA36-500-9-6 1/2 2 1/4 6 6.00 6.00 4.00 5.75 4.00 5.25
    MBA36-500-10-7 1/2 2 1/4 7 4.00 6.00 4.00 5.75 4.00 5.25
    MBA36-625-8-5 1/2 5/8 1 3/4 5 1/2 10.00 7.50 8.00 7.00 8.00 6.75
    MBA36-625-10-7 1/2 5/8 1 3/4 7 1/2 8.00 7.50 6.00 7.00 4.00 6.75
    MBA36-625-11-8 5/8 2 1/4 8 6.00 7.50 6.00 7.00 4.00 6.75
    MBA36-750-10-7 3/4 2 7 12.00 9.00 10.00 8.50 8.00 8.00
    MBA36-750-13-9 3/4 3 9 8.00 9.00 8.00 8.50 6.00 8.00
    MBA36-750-14-10 1/2 3/4 3 1/2 10 1/2 6.00 9.00 6.00 8.50 4.00 8.00
    MBA36-1000-13-9 1 2 3/4 9 16.00 12.00 14.00 11.25 12.00 10.50
    MBA36-1000-16-12 1 2 3/4 12 12.00 12.00 10.00 11.25 8.00 10.50
    MBA36-1000-18-14 1 2 3/4 14 8.00 12.00 8.00 11.25 6.00 10.50
    MBA36-1250-16-12 1 1/4 2 3/4 12 18.00 15.00 16.00 14.00 14.00 13.25
    MBA36-1250-18-14 1 1/4 2 3/4 14 16.00 15.00 14.00 14.00 12.00 13.25
    MBA36-1250-23-19 1 1/4 2 3/4 19 10.00 15.00 10.00 14.00 8.00 13.25

    *Recommendation based on independent laboratory testing. All other embedment and center to center recommendations based on design by analysis provisions of ACI 349. Appendix B.

    NOTES:

    1. Maximum attachment thickness is based on torque tensioning of anchor. Any lesser attachment thickness may be used. Where the anchor is to be hydraulically tensioned, maximum attachment thicknesses will be reduced by one stud diameter.
    2. Consideration of stress area reduction for limited concrete depth is not reflected in the above table. Minimum concrete depth = anchor embedment plus (center-to-center spacing/2).
    3. Maxi-Bolt part numbers are specified as follows: MB-Diameter Series Number --- Overall Length-Sleeve Length (combined expansion sleeve and distance tube lengths).
    4. Minimum edge distances quoted are for shear or combined tension and shear. For tension loading, edge distance may be reduced to 75 percent of given value.
    5. Allowable values are limited to a maximum of six bolts in a two-row, three-column, or three-row, two-column arrangement. Allowable values may also be used for anchors placed in a single line and separated from other anchor lines by a minimum distance of two times the anchor embedment length.
    6. In-place embedment length is determined by subtracting the over-all length (second number shown in Anchor Part No. column) from the exposed projection.





    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.



    Embedment and Center-to-Center Spacing Requirements
    for Drillco Maxi-Bolts with ASTM A193 Grade B8 (Type 304)
    and B8M (Type 316) Class 1 Stainless Stud Bolts
    with up to six bolts in a rectangular pattern

    ANCHOR PART NO.
    ANCHOR
    STUD
    DIAMETER
    (Inches)
    MAXIMUM
    ATTACHMENT
    THICKNESS
    (Inches)
    EMBEDMENT
    (Inches)
    3000 psi CONCRETE
    4000 psi CONCRETE
    5000 psi CONCRETE
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    SAMB-375-6-3 1/2 3/8 2.50 3 1/2 6.50 5.25 5.50 4.75 5.00 4.50
    SAMB-375-6-4 1/2 3/8 1.50 4 1/2 5.00 5.25 4.00 4.75 4.00 4.50
    SAMB-500-8-5 1/2 2.00 5 8.50 7.00 7.00 6.50 6.50 6.00
    SAMB-500-10-6 1/2 1/2 2.50 6 1/2 6.00 7.00 6.00 6.50 6.00 6.00
    SAMB-625-10-6 5/8 2.75 6 11.00 8.50 9.50 8.00 8.50 7.50
    SAMB-625-12-8 5/8 2.75 8 8.00 8.50 8.00 8.00 6.00 7.50
    SAMB-750-11-7 3/4 2.50 7 14.50 10.25 12.00 9.50 10.50 9.00
    SAMB-750-13-9 1/2 3/4 2.00 9 1/2 10.00 10.25 10.00 9.50 8.00 9.00
    SAMB-1000-14-9 1/2 1 2.50 9 1/2 19.00 13.75 16.00 12.75 14.50 12.00
    SAMB-1000-16-12 1 2.00 12 14.00 13.75 14.00 12.75 12.00 12.00
    SAMB-1250-16-12 1 1/4 1.75 12 25.50 17.00 20.50 15.75 18.50 15.00
    SAMB-1250-22-16 1 1/4 3.75 16 18.00 17.00 16.00 15.75 14.00 15.00

    *Recommendation based on independent laboratory testing. All other embedment and center to center recommendations based on design by analysis provisions of ACI 349. Appendix B.

    NOTES:

    1. Maximum attachment thickness is based on torque tensioning of anchor. Any lesser attachment thickness may be used. Where the anchor is to be hydraulically tensioned, maximum attachment thicknesses will be reduced by one stud diameter.
    2. Consideration of stress area reduction for limited concrete depth is not reflected in the above table. Minimum concrete depth = anchor embedment plus (center-to-center spacing/2).
    3. Maxi-Bolt part numbers are specified as follows: MB-Diameter Series Number --- Overall Length-Sleeve Length (combined expansion sleeve and distance tube lengths).
    4. Minimum edge distances quoted are for shear or combined tension and shear. For tension loading, edge distance may be reduced to 75 percent of given value.
    5. Allowable values are limited to a maximum of six bolts in a two-row, three-column, or three-row, two-column arrangement. Allowable values may also be used for anchors placed in a single line and separated from other anchor lines by a minimum distance of two times the anchor embedment length.
    6. In-place embedment length is determined by subtracting the over-all length (second number shown in Anchor Part No. column) from the exposed projection.





    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.



    Embedment and Center-to-Center Spacing Requirements
    for Drillco Maxi-Bolts with ASTM A193 Grade B8 (Type 304) Class 2 Stainless Stud Bolts
    with up to six bolts in a rectangular pattern

    ANCHOR PART NO.
    ANCHOR
    STUD
    DIAMETER
    (Inches)
    MAXIMUM
    ATTACHMENT
    THICKNESS
    (Inches)
    EMBEDMENT
    (Inches)
    3000 psi CONCRETE
    4000 psi CONCRETE
    5000 psi CONCRETE
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    SAMB-375-6-4 1/2 3/8 1.50 4 1/2 9.00 6.75 7.50 6.25 6.50 6.00
    SAMB-500-8-6 1/2 1.00 6 12.50 8.75 10.00 8.25 9.00 7.75
    SAMB-500-11-8 1/2 2.00 8 8.50 8.75 7.00 8.25 6.00 7.75
    SAMB-500-13-10 1/2 2.00 10 6.00 8.75 4.50 8.25 4.00 7.75
    SAMB-625-10-7 1/2 5/8 1.25 7 1/2 16.00 11.00 13.00 10.25 11.50 9.75
    SAMB-625-13-9 1/2 5/8 2.25 9 1/2 11.50 11.00 9.50 10.25 8.50 9.75
    SAMB-625-16-12 5/8 2.75 12 8.00 11.00 6.50 10.25 5.50 9.75
    SAMB-750-13-9 1/4 3/4 2.75 9 1/4 18.50 13.00 15.00 12.25 13.50 11.75
    SAMB-750-16-11 1/2 3/4 3.50 11 1/2 14.00 13.00 12.00 12.25 10.50 11.75
    SAMB-750-18-13 3/4 4.00 13 12.00 13.00 10.00 12.25 8.50 11.75
    SAMB-1000-16-12 1 2.00 12 24.00 16.75 20.00 15.75 16.00 14.75
    SAMB-1000-22-16 1 4.00 16 16.00 16.75 14.00 15.75 12.00 14.75
    SAMB-1000-26-20 1 4.00 20 10.00 16.75 8.00 15.75 6.00 14.75
    SAMB-1250-20-15 1 1/4 3.00 15 28.00 20.00 22.00 18.75 20.00 17.75
    SAMB-1250-25-20 1 1/4 3.00 20 18.00 20.00 14.00 18.75 12.00 17.75
    SAMB-1250-30-25 1 1/4 3.00 25 8.00 20.00 8.00 18.75 6.00 17.75

    *Recommendation based on independent laboratory testing. All other embedment and center to center recommendations based on design by analysis provisions of ACI 349. Appendix B.

    NOTES:

    1. Maximum attachment thickness is based on torque tensioning of anchor. Any lesser attachment thickness may be used. Where the anchor is to be hydraulically tensioned, maximum attachment thicknesses will be reduced by one stud diameter.
    2. Consideration of stress area reduction for limited concrete depth is not reflected in the above table. Minimum concrete depth = anchor embedment plus (center-to-center spacing/2).
    3. Maxi-Bolt part numbers are specified as follows: MB-Diameter Series Number --- Overall Length-Sleeve Length (combined expansion sleeve and distance tube lengths).
    4. Minimum edge distances quoted are for shear or combined tension and shear. For tension loading, edge distance may be reduced to 75 percent of given value.
    5. Allowable values are limited to a maximum of six bolts in a two-row, three-column, or three-row, two-column arrangement. Allowable values may also be used for anchors placed in a single line and separated from other anchor lines by a minimum distance of two times the anchor embedment length.
    6. In-place embedment length is determined by subtracting the over-all length (second number shown in Anchor Part No. column) from the exposed projection.





    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.



    Embedment and Center-to-Center Spacing Requirements
    for Drillco Maxi-Bolts with ASTM A193 Grade B8M (Type 316)
    Class 2 Stainless Stud Bolts
    with up to six bolts in a rectangular pattern

    ANCHOR PART NO.
    ANCHOR
    STUD
    DIAMETER
    (Inches)
    MAXIMUM
    ATTACHMENT
    THICKNESS
    (Inches)
    EMBEDMENT
    (Inches)
    3000 psi CONCRETE
    4000 psi CONCRETE
    5000 psi CONCRETE
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    Minimum
    Center to
    Center
    Spacing
    (Inches)
    Minimum
    Edge
    Distance
    (Inches)
    SAMB-375-6-3 1/2 3/8 2.50 *3.5 * 7.50 6.25 *7.50 5.75 * 7.50 5.50
    SAMB-375-6-4 1/2 3/8 1.50 4 1/2 9.00 6.25 7.00 5.75 6.00 5.50
    SAMB-500-8-6 1/2 1.00 6 12.00 8.25 10.00 7.75 8.00 7.25
    SAMB-500-11-8 1/2 2.00 8 8.00 8.25 6.00 7.75 6.00 7.25
    SAMB-500-13-10 1/2 2.00 10 6.00 8.25 4.00 7.75 4.00 7.25
    SAMB-625-10-7 1/2 5/8 1.25 7 1/2 16.00 10.25 12.00 9.75 10.00 9.00
    SAMB-625-13-9 1/2 5/8 2.25 9 1/2 10.00 10.25 8.00 9.75 8.00 9.00
    SAMB-625-16-12 5/8 2.75 12 8.00 10.25 6.00 9.75 4.00 9.00
    SAMB-750-13-9 1/4 3/4 2.75 9 1/4 18.00 12.50 14.00 11.50 12.00 11.00
    SAMB-750-16-11 1/2 3/4 3.50 11 1/2 14.00 12.50 12.00 11.50 10.00 11.00
    SAMB-750-18-13 3/4 4.00 13 12.00 12.50 10.00 11.50 8.00 11.00
    SAMB-1000-15-11 1 2.00 11 22.00 15.75 18.00 14.75 16.00 13.75
    SAMB-1000-18-14 1 2.00 14 16.00 15.75 14.00 14.75 12.00 13.75
    SAMB-1000-20-16 1 2.00 16 12.00 15.75 10.00 14.75 8.00 13.75
    SAMB-1250-18-14 1 1/4 2.00 14 28.00 19.00 24.00 17.75 20.00 16.75
    SAMB-1250-24-18 1 1/4 4.00 18 22.00 19.00 18.00 17.75 14.00 16.75
    SAMB-1250-28-22 1 1/4 4.00 22 18.00 19.00 14.00 17.75 10.00 16.75

    *Recommendation based on independent laboratory testing. All other embedment and center to center recommendations based on design by analysis provisions of ACI 349. Appendix B.

    NOTES:

    1. Maximum attachment thickness is based on torque tensioning of anchor. Any lesser attachment thickness may be used. Where the anchor is to be hydraulically tensioned, maximum attachment thicknesses will be reduced by one stud diameter.
    2. Consideration of stress area reduction for limited concrete depth is not reflected in the above table. Minimum concrete depth = anchor embedment plus (center-to-center spacing/2).
    3. Maxi-Bolt part numbers are specified as follows: MB-Diameter Series Number --- Overall Length-Sleeve Length (combined expansion sleeve and distance tube lengths).
    4. Minimum edge distances quoted are for shear or combined tension and shear. For tension loading, edge distance may be reduced to 75 percent of given value.
    5. Allowable values are limited to a maximum of six bolts in a two-row, three-column, or three-row, two-column arrangement. Allowable values may also be used for anchors placed in a single line and separated from other anchor lines by a minimum distance of two times the anchor embedment length.
    6. In-place embedment length is determined by subtracting the over-all length (second number shown in Anchor Part No. column) from the exposed projection.





    Dimensions and Tolerances for Drill Bits
    and Undercutting Tools
    Used to Install Drillco Maxi-Bolts

    NOMINAL
    ANCHOR SIZE
    (Inches)
    DRILL DIAMETER
    MAXIMUM
    (Inches)
    MINIMUM HOLE
    DEPTH, ANCHOR
    EMBEDMENT
    PLUS
    UNDERCUTTING TOOL
    Diameter A
    (Inches)
    Diameter B
    (Inches)
    Tolerance
    (Inches)
    1/4 0.530 1 inch 0.500 0.750 +.020
    -.060
    3/8 0.655 1 inch 0.625 0.875 +.020
    -.060
    1/2 0.778 1 inch 0.709 0.949 +.010
    -.030
    5/8 0.975 1 inch 0.905 1.176 +.010
    -.030
    3/4 1.172 1 1/2 inch 1.102 1.550 +.010
    -.040
    1 1.690 2 inches 1.625 2.275 +.010
    -.050
    1 1/4 2.065 2 inches 2.000 2.770 +.010
    -.060
    1/2 Heavy 0.845 1 inch 0.812 1.120 +.010
    -.030

    NOTES:

    1. Undercutting tool diameter A is given for identification purposes only. No tolerance applies to this dimension.
    2. Undercutting tool diameters A and B are noted in Figure No. 3.