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CONFAST 316 Stainless Steel Concrete Wedge Anchor
The CONFAST 316 Stainless Steel Concrete Wedge Anchor is built for demanding fastening applications where corrosion resistance is non-negotiable. Machined from 316 stainless steel, this wedge-style mechanical anchor expands against the walls of a pre-drilled hole in solid concrete to deliver dependable, long-term holding power for structural and non-structural attachments. Because it is sold by the box, with the box quantity shown for each available size, contractors, fabricators, and facility maintenance teams can order the exact volume a project calls for without guesswork. The 316 stainless alloy is widely recognized in the fastener industry for superior resistance to rust, pitting, and chemical attack compared to standard carbon steel or 304 stainless anchors, making this anchor a preferred choice anywhere moisture, salt exposure, or corrosive atmospheres are a concern.
Key Features
- Premium Corrosion-Resistant Material: Manufactured from 316 stainless steel, offering enhanced resistance to rust, staining, and chemical corrosion versus standard steel or 304-grade anchors.
- Wedge Anchor Design: Mechanical wedge-style expansion anchor engineered to set securely into solid base concrete for reliable, vibration-resistant holding power.
- Sold By the Box: Packaged and sold by the box, with the exact box quantity listed for each size, simplifying bulk ordering for jobsite and shop stock.
- Consistent Quality: Manufactured to CONFAST's quality standards for uniform thread engagement and reliable expansion performance anchor to anchor.
- Made in the USA: Produced domestically for dependable sourcing and consistent manufacturing oversight.
Technical Specifications
- Product Type: Concrete Anchor
- Country of Origin: US
Typical Applications
- Marine, Coastal, and Wet-Environment Concrete Anchoring
- Outdoor Structural and Equipment Attachments
- Industrial and Commercial Concrete Fastening
- Chemical Plant and Wastewater Facility Installations
- Renovation and New Construction Projects Requiring Stainless Hardware
Why CONFAST?
CONFAST anchors are built around material integrity and consistent performance, and the 316 Stainless Steel Wedge Anchor is no exception. By specifying 316 stainless steel rather than a lower-grade alloy, CONFAST gives contractors and specifiers a fastening solution suited to the harshest corrosive environments, from coastal construction to chemical processing facilities. Combined with box-quantity packaging that is clearly labeled for each size, this anchor makes it straightforward to stock, order, and install the right anchor for the job while maintaining the corrosion resistance professional installations demand.
Specifications by Size
| Size | Pull-Out (lbs.) | Shear (lbs.) | Bit Size | Box Qty | Length ID Code | Max. Fixture Thickness | Max. Torque | Min. Edge Distance | Min. Embedment | Min. Fixture Hole Ø (Hole Spotted) | Min. Fixture Hole Ø (In Place) | Min. Spacing | Thread Length | Thread Type | Wrench Size | UPC |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/4" x 1-3/4" (Box of 100) | 877 | 1082 | 1/4" | 100 | A | 3/8" | 5 - 10 ft./lbs. | 1-1/4" | 1-1/8" | 1/4" | 5/16" | 2-1/2" | 5/8" | 1/4" - 20 | 7/16" | 820274002834 |
| 1/4" x 2-1/4" (Box of 100) | 877 | 1082 | 1/4" | 100 | B | 7/8" | 5 - 10 ft./lbs. | 1-1/4" | 1-1/8" | 1/4" | 5/16" | 2-1/2" | 1-1/8" | 1/4" - 20 | 7/16" | 820274002841 |
| 1/4" x 3-1/4" (Box of 100) | 877 | 1082 | 1/4" | 100 | E | 1-7/8" | 5 - 10 ft./lbs. | 1-1/4" | 1-1/8" | 1/4" | 5/16" | 2-1/2" | 2-1/8" | 1/4" - 20 | 7/16" | 820274002858 |
| 3/8" x 2-1/4" (Box of 50) | 1223 | 3238 | 3/8" | 50 | B | 3/8" | 25 - 30 ft./lbs. | 1-7/8" | 1-1/2" | 3/8" | 1/2" | 3-3/4" | 1" | 3/8" - 16 | 9/16" | 820274002926 |
| 3/8" x 2-3/4" (Box of 50) | 1223 | 3238 | 3/8" | 50 | C | 7/8" | 25 - 30 ft./lbs. | 1-7/8" | 1-1/2" | 3/8" | 1/2" | 3-3/4" | 1-1/4" | 3/8" - 16 | 9/16" | 820274002933 |
| 3/8" x 3" (Box of 50) | 1223 | 3238 | 3/8" | 50 | D | 1-1/8" | 25 - 30 ft./lbs. | 1-7/8" | 1-1/2" | 3/8" | 1/2" | 3-3/4" | 1-1/2" | 3/8" - 16 | 9/16" | 820274002940 |
| 3/8" x 3-3/4" (Box of 50) | 1223 | 3238 | 3/8" | 50 | E | 1-7/8" | 25 - 30 ft./lbs. | 1-7/8" | 1-1/2" | 3/8" | 1/2" | 3-3/4" | 2-1/4" | 3/8" - 16 | 9/16" | 820274002964 |
| 3/8" x 5" (Box of 50) | 1223 | 3238 | 3/8" | 50 | H | 3-1/8" | 25 - 30 ft./lbs. | 1-7/8" | 1-1/2" | 3/8" | 1/2" | 3-3/4" | 3-1/2" | 3/8" - 16 | 9/16" | 820274002971 |
| 1/2" x 2-3/4" (Box of 25) | 2999 | 5564 | 1/2" | 25 | C | 1/8" | 50 - 60 ft./lbs. | 2-1/2" | 2-1/4" | 1/2" | 5/8" | 5" | 1" | 1/2" - 13 | 3/4" | 820274002780 |
| 1/2" x 3-3/4" (Box of 25) | 2999 | 5564 | 1/2" | 25 | D | 1" | 50 - 60 ft./lbs. | 2-1/2" | 2-1/4" | 1/2" | 5/8" | 5" | 2" | 1/2" - 13 | 3/4" | 820274002797 |
| 1/2" x 4-1/4" (Box of 25) | 2999 | 5564 | 1/2" | 25 | F | 1-1/2" | 50 - 60 ft./lbs. | 2-1/2" | 2-1/4" | 1/2" | 5/8" | 5" | 2-1/2" | 1/2" - 13 | 3/4" | 820274002803 |
| 1/2" x 5-1/2" (Box of 25) | 2999 | 5564 | 1/2" | 25 | I | 2-3/4" | 50 - 60 ft./lbs. | 2-1/2" | 2-1/4" | 1/2" | 5/8" | 5" | 4" | 1/2" - 13 | 3/4" | 820274002810 |
| 1/2" x 7" (Box of 25) | 2999 | 5564 | 1/2" | 25 | L | — | 50 - 60 ft./lbs. | 2-1/2" | 2-1/4" | 1/2" | 5/8" | 5" | 4" | 1/2" - 13 | 3/4" | 820274002827 |
| 5/8" x 3-1/2" (Box of 25) | 3749 | 6198 | 5/8" | 25 | E | 1/8" | 75 - 90 ft./lbs. | 3-1/8" | 2-3/4" | 5/8" | 7/8" | — | 1-1/4" | — | 15/16" | 820274002988 |
| 5/8" x 4-1/2" (Box of 25) | 3749 | 6198 | 5/8" | 25 | G | 1-1/8" | 75 - 90 ft./lbs. | 3-1/8" | 2-3/4" | 5/8" | 7/8" | — | 2-1/4" | — | 15/16" | 820274002995 |
| 5/8" x 5" (Box of 20) | 3749 | 6198 | 5/8" | 20 | H | 1-5/8" | 75 - 90 ft./lbs. | 3-1/8" | 2-3/4" | 5/8" | 7/8" | — | 2-3/4" | — | 15/16" | 820274003008 |
| 5/8" x 6" (Box of 20) | 3749 | 6198 | 5/8" | 20 | J | 2-5/8" | 75 - 90 ft./lbs. | 3-1/8" | 2-3/4" | 5/8" | 7/8" | — | 3-3/4" | — | 15/16" | 820274003015 |
| 5/8" x 7" (Box of 20) | 3749 | 6198 | 5/8" | 20 | L | 3-5/8" | 75 - 90 ft./lbs. | 3-1/8" | 2-3/4" | 5/8" | 7/8" | — | 4" | — | 15/16" | 820274003022 |
| 5/8" x 8-1/2" (Box of 20) | 3749 | 6198 | 5/8" | 20 | O | 5-1/8" | 75 - 90 ft./lbs. | 3-1/8" | 2-3/4" | 5/8" | 7/8" | — | 4" | — | 15/16" | 820274003039 |
| 3/4" x 4-1/4" (Box of 20) | 4978 | 9378 | 3/4" | 20 | F | 1/4" | 150 - 175 ft./lbs. | 3-3/4" | 3-1/4" | 3/4" | 1" | 7-1/2" | 1-3/4" | 3/4" - 10 | 1-1/8" | 820274002865 |
| 3/4" x 4-3/4" (Box of 20) | 4978 | 9378 | 3/4" | 20 | G | 3/4" | 150 - 175 ft./lbs. | 3-3/4" | 3-1/4" | 3/4" | 1" | 7-1/2" | 2-1/4" | 3/4" - 10 | 1-1/8" | 820274002872 |
| 3/4" x 5-1/2" (Box of 20) | 4978 | 9378 | 3/4" | 20 | I | 1-1/2" | 150 - 175 ft./lbs. | 3-3/4" | 3-1/4" | 3/4" | 1" | 7-1/2" | 3" | 3/4" - 10 | 1-1/8" | 820274002889 |
| 3/4" x 6-1/4" (Box of 20) | 4978 | 9378 | 3/4" | 20 | J | 2-1/4" | 150 - 175 ft./lbs. | 3-3/4" | 3-1/4" | 3/4" | 1" | 7-1/2" | 3-3/4" | 3/4" - 10 | 1-1/8" | 820274002896 |
| 3/4" x 7" (Box of 10) | 4978 | 9378 | 3/4" | 10 | L | 3" | 150 - 175 ft./lbs. | 3-3/4" | 3-1/4" | 3/4" | 1" | 7-1/2" | 4" | 3/4" - 10 | 1-1/8" | 820274002902 |
| 3/4" x 8-1/2" (Box of 10) | 4978 | 9378 | 3/4" | 10 | O | 4-1/2" | 150 - 175 ft./lbs. | 3-3/4" | 3-1/4" | 3/4" | 1" | 7-1/2" | 4" | 3/4" - 10 | 1-1/8" | 820274002919 |
| 3/4" x 10" (Box of 10) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1" x 6" (Box of 5) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1" x 9" (Box of 5) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1" x 12" (Box of 5) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Manufacturer Resources
Product Specs
- Product Brand:
- CONFAST
- Product Type:
- Concrete Anchor
- Country of Origin:
- US
- Department:
- Fasteners
- Product Group:
- Concrete Anchors
- Product Subgroup:
- Concrete Anchors
- Product Material:
- 316 Stainless Steel
- Location Rating:
- Submerged/Chemicals
- Base Material:
- Concrete only
- Product Attribute:
- Male (threaded stud)
CONFAST WAS-31638214A – Frequently Asked Questions
1) Can CONFAST 316 stainless wedge anchors be used in block, brick, or mortar?
No. The CONFAST 316 stainless wedge anchor is rated for solid concrete only. It works by expanding a wedge clip against the wall of a drilled hole, and hollow block or brick will not develop that holding force. For masonry or block you need an anchor specifically rated for those base materials.
2) What drill bit do I use for a 1/2 inch CONFAST stainless wedge anchor?
Wedge anchors are drilled with a carbide bit matching the anchor's nominal diameter, so a 1/2 inch anchor takes a 1/2 inch bit, a 3/8 inch anchor a 3/8 inch bit, and a 3/4 inch anchor a 3/4 inch bit. The 1/2 inch size needs a minimum 2-1/4 inch embedment, so drill the hole deeper than the embedment to allow for dust.
3) How do I pick the right length CONFAST wedge anchor for the thickness of what I'm bolting down?
Take the minimum embedment for the diameter and add your fixture thickness. Each length is rated for a maximum fixture thickness: a 3/8 x 2-1/4 handles 3/8 inch of fixture, a 3/8 x 3 handles 1-1/8 inch, and a 3/8 x 5 handles 3-1/8 inch. Minimum embedment for 3/8 inch is 1-1/2 inches, for 1/2 inch it is 2-1/4 inches, for 5/8 inch 2-3/4 inches, and for 3/4 inch 3-1/4 inches. If your baseplate is thicker than the listed max, move up a length.
4) How close to the edge of a concrete slab can I set a CONFAST stainless wedge anchor?
Minimum edge distance goes up with diameter: 1-1/4 inches for the 1/4 inch anchor, 1-7/8 inches for 3/8 inch, 2-1/2 inches for 1/2 inch, 3-1/8 inches for 5/8 inch, and 3-3/4 inches for 3/4 inch. Set one closer than that and the expansion force can spall the slab edge. Anchor-to-anchor spacing is also specified, for example 5 inches between 1/2 inch anchors and 7-1/2 inches between 3/4 inch anchors.
5) What torque should I tighten a CONFAST stainless wedge anchor to?
Installation torque is by diameter: 5 to 10 ft-lbs for 1/4 inch, 25 to 30 ft-lbs for 3/8 inch, 50 to 60 ft-lbs for 1/2 inch, 75 to 90 ft-lbs for 5/8 inch, and 150 to 175 ft-lbs for 3/4 inch. Use a torque wrench rather than an impact gun. Overtightening a stainless wedge anchor can gall the threads or pull the cone past its set.
6) What size hole does the baseplate need for a CONFAST wedge anchor, and can I install through a fixture already in place?
Yes, these can be installed through the fixture. Two hole sizes are specified per diameter: the hole-spotted size (drilling through the fixture into the slab) and the larger in-place size where the anchor is driven through an existing fixture hole. For 3/8 inch that is 3/8 inch spotted or 1/2 inch in place; for 1/2 inch, 1/2 inch spotted or 5/8 inch in place; for 3/4 inch, 3/4 inch spotted or 1 inch in place. The nut and washer come on the anchor since it is a male threaded stud.
7) Is 316 stainless worth it over 304 or galvanized for coastal and wastewater anchoring?
That is exactly what this anchor is for. CONFAST specifies 316 stainless, which resists pitting and chloride attack better than carbon steel or 304, and the anchor is rated for submerged and chemical exposure locations. Salt spray on a pier, a chemical plant slab, or a clarifier deck are the cases where 316 pays for itself; for a dry interior warehouse floor a plated carbon steel wedge anchor does the same mechanical job.
8) What wrench size and thread do CONFAST stainless wedge anchors use?
Threads are standard UNC: 1/4-20 on the 1/4 inch, 3/8-16 on the 3/8 inch, 1/2-13 on the 1/2 inch, and 3/4-10 on the 3/4 inch, so any off-the-shelf nut in the same alloy fits. Nut wrench sizes are 7/16 inch for 1/4, 9/16 inch for 3/8, 3/4 inch for 1/2, 15/16 inch for 5/8, and 1-1/8 inch for 3/4.
9) What are the pull-out and shear values for CONFAST 316 stainless wedge anchors?
Published ultimate values by diameter: 1/4 inch at 877 lbs pull-out and 1082 lbs shear, 3/8 inch at 1223 and 3238, 1/2 inch at 2999 and 5564, 5/8 inch at 3749 and 6198, and 3/4 inch at 4978 and 9378. These are ultimate test values, not working loads, so apply your engineer's safety factor before sizing a connection.
10) How are CONFAST 316 stainless wedge anchors packaged, and what quantity comes in a box?
They ship by the box, with the count set by size. 1/4 inch comes 100 per box, 3/8 inch 50 per box, 1/2 inch and the shorter 5/8 inch lengths 25 per box, the longer 5/8 inch and mid-length 3/4 inch 20 per box, the long 3/4 inch 10 per box, and the 1 inch diameter 5 per box. Useful for MRO shelf stock where you want a full box of one size rather than a mixed handful.
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Absolutely. The CONFAST WAS-31638214A is backed by a manufacturer’s warranty.
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