Technical Specifications - Machine Screw Anchor
There are numerous technical specifications that must be considered when using the Machine Screw Anchor. Considerations include: Machine Screw Anchor diameter, internal thread length, minimum embedment and required hole size. The Machine Screw Anchor is a great fastener when irregular hole sizes are a concern. The size of the Machine Screw Anchor refers to the diameter of the machine screw or bolt to be used with this fastener. Once all these factors have been determined, you can find the expected holding values in the technical information below.
Machine Screw Anchor Bolt Length:
To determine the minimum length of machine bolt required, add the thickness of the material being fastened to the Machine Screw anchor length.
Machine Screw Anchor Spacing:
The forces on a Machine Screw Anchor are transferred to the material in which it is installed. If the anchors are installed too close together, it can cause an interaction of the forces, thus reducing the holding power of the anchor. As a rule of thumb, the expansion anchor industry has established a minimum standard of ten (10) anchor diameters for spacing between anchors and five (5) anchor diameters from an unsupported edge. When vibration or sudden impact are part of the load conditions, the spacing should be increased.
Machine Screw Ultimate Holding Values** - CONCRETE
| #10 |
5/8" |
10-24 |
3/8" |
5/8" |
1320 |
| 1/4" |
7/8" |
1/4-20 |
1/2" |
7/8" |
2332 |
| 5/16" |
1" |
5/16-18 |
5/8" |
1" |
3014 |
| 3/8" |
1-1/4" |
3/8-16 |
3/4" |
1-1/4" |
4796 |
| 1/2" |
1-1/2" |
1/2-13 |
7/8" |
1-1/2" |
5918 |
| 5/8" |
2" |
5/8-11 |
1-1/8" |
2" |
7700 |
| 3/4" |
2-1/4" |
3/4-10 |
1-1/4" |
2-1/4" |
11,220 |
** Values shown are average ultimate values and are offered only as a guide and are not guaranteed. A safety factor of 4:1 or 25% is generally accepted as a safe working load. Reference should be made to applicable codes for the specific working ratio. All values are based on close-tolerance holes drilled with carbide tipped drill bits. Designated holding power depends on the quality of the masonry material, depth of embedment, and proper hole size.