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Concrete Anchors & Fasteners is Our Specialty   Questions? Contact Mike   

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5/16" Machine Screw Anchor, 100/Box

   Availability: In Stock
  Questions? Email Mike

$47.79 per Box of 100
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Purchase direct the premium brand 5/16" Machine Screw Anchor and save. All orders ship the same day and freight is free.
SKU: MS516


Customer Reviews

Required To Install: 5/16" Machine Screw Anchor Set Tool, Each

CONFAST® - 5/16" Machine Screw Anchor

The 5/16" Machine Screw Anchor is preassembled and packaged with 100 pieces per box. This anchor requires the use of a setting tool to set the anchor in the masonry material. They are fully stocked in the Cleveland, Ohio warehouse so that all orders ship the same day. All orders $25.00 or more will ship for free.

  • Bit size 5/8"
  • Minimum embedment 1"
  • Designated diameter is equal to bolt diameter
  • Anchor has national coarse threads
  • Very versatile, can be used in most masonry materials
  • Highly corrosion resistant
  • Do not use in vibratory loads
  • Insert with threaded open end up
  • Not recommended for overhead applications
  • Proper setting tool must be used
  • Freight is free for orders $25.00 and more
Products specifications
Bit Size 5/8"
Minimum Embedment 1"
Thread Type 5/16" - 18
2000 PSI Concrete - Pull-Out (lbs.) * 1177
Type Female
Diameter 5/16"
Length 1"
Material Anchor Body Antimonial Lead Alloy/Cone Zamac Alloy
Environment Moist
Box Qty 100
Minimum Edge Distance 3-1/8"
Minimum Fixture Hole Diameter (In Place) 3/4"
Minimum Fixture Hole Diameter (Hole Spotted) 5/16"
Inside Anchor Diameter-Bolt Diameter 5/16"
Outside Anchor Diameter 5/8"
Internal Thread Length 3/4"
Length Measurement End to End
Bolt Length Fixture Thickness + Embedment Depth
Brand Name CONFAST®

The 5/16" Machine Screw Anchor is made from Anchor Body Antimonial Lead Alloy/Cone Zamac Alloy. This anchor is designed for use in concrete, block, and brick.

The anchor is designed for use in an outdoor, moist environment.

Hole Diameter/Bit Diameter
The 5/16" Machine Screw Anchor requires a 5/8" hole to be drilled in the base material (concrete, block, and brick). The hole should be drilled with carbide tipped bit that meets ANSI standards and used in a hammer drill.

Designated Size
The designated size of the anchor refers to the inside diameter 5/16" of the anchor or the diameter of the threaded rod or bolt that can be inserted into it.

Diameter of Anchor
The diameter of the 5/16" Machine Screw Anchor is 5/16".

Length Anchor
The length of the anchor is 1" (one inch), and is measured as an overall length of the anchor from end to end.

Thread Type
The threads on the 5/16" Machine Screw Anchor are national coarse threads that measures 5/16" with 18 threads per inch, commonly referred to as 5/16"-18.

Setting Tool
Each anchor must be set in the concrete with a specific setting tool. The anchor is set using the 5/16" setting tool part number MST516, which is sold separately.

The 5/16" Machine Screw Anchor is packaged with 100 pieces per box and does not come with a setting tool.

Minimum Embedment
The anchor minimum embedment into the concrete is 1". Therefore, the anchor must be installed so that a minimum of 1" of the anchor is embedded into the concrete.

Fixture Hole Diameter
The hole in the fixture or material being fastened must be larger than the designated diameter of the 5/16" Machine Screw Anchor. The 5/16" diameter anchor requires the hole in the fixture to be 3/4".

Torque Value
The maximum torque that can be applied to the anchor once installed is 7 ft. lbs.

Spacing between Anchors
Each 5/16" Machine Screw Anchor must be spaced a minimum distance of 6-1/4" from each other when measured center to center.

Edge Distance
It is very important not to install the anchor any closer than 3-1/8" from an unsupported edge of concrete.

Bolt Length
When a bolt is used in conjunction with the 5/16" Machine Screw Anchor, the length of the bolt needed is determined by considering these factors:

  • Flush With Concrete - when the 5/16" Machine Screw Anchor is set flush with the surface of the concrete, add the thickness of the material being fastened to the thread and then add the space for any washers used.
  • Below Surface of Concrete - add the depth below the surface of the concrete to the thickness of the material being fastened, then add the space for the washer, and, finally, add for the thread engagement.

Holding Values - Ultimate Load Values in 2000 PSI Concrete

5/16" Machine Screw Anchor Size

Minimum Embedment

Pull-Out (lbs.)

Shear (lbs.)

5/16" x 1" (one inch)




Product Information


Part number

Quantity per Box

5/16" Machine Screw Anchor



Installing a 5/16" Machine Screw Anchor
  1. Drill a 5/8" hole into the concrete using a carbide-tipped bit that meets ANSI Standards B212.15.
  2. The depth of the hole can be deeper or equal to the minimum embedment depth of 1" which is equal to the length of the anchor .
  3. Clean the hole with a wire brush, vacuum, compressed air, or a blow-out bulb.
  4. Insert the anchor into the hole with the threaded cone end first.
  5. Take the correct 5/16" Machine Screw Anchor setting tool and insert the smaller diameter end into the open end of the 5/16" Machine Screw Anchor.
  6. Strike the end of the setting tool with a hammer until the anchor is fully set.
  7. The 5/16" Machine Screw Anchor is now set. A 5/16" diameter bolt can be inserted into the 5/16" Machine Screw Anchor with a maximum torque of 7 ft. lbs.
  8. Always use proper personal protective equipment per manufacturer's and OSHA instructions.

5/16" machine screw anchor - brick - security camera 5/16" machine screw anchor - brick - light fixture 5/16" machine screw anchor - block - small conduit 5/16" machine screw anchor - block - shower grab bar


* The figures above indicate average ultimate tension and shear failure values. A safety factor of 4:1 or 25% of ultimate value is generally accepted as a safe working load. Reference should always be made to applicable codes.

These bits work with the selected anchor
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