# Wedge anchors for concrete, Simpson Strong-Bolt 2: drill bit, fixture hole, wrench size, torque, stocked lengths, 1/4 to 1 in

> What drill bit, fixture hole and torque does a 1/2 in wedge anchor need in concrete?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: Simpson Strong-Tie's Strong-Bolt 2 catalog pages (carbon steel installation and product data), with the stainless-steel catalog pages as a cross-check; numbers only
- Page: https://xemstudio.com/objects/wedge-anchors-simpson-strong-bolt-2/ · JSON: https://xemstudio.com/api/geometry?object=wedge-anchors-simpson-strong-bolt-2 · Plain text: https://xemstudio.com/objects/wedge-anchors-simpson-strong-bolt-2/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- Inches. Installation data per anchor diameter: drill bit (a carbide bit of the nominal diameter, same as the anchor), minimum fixture (clearance) hole, wrench size and installation torque in ft-lbf for carbon steel (and stainless where printed). The stainless sheet agrees with the carbon sheet on drill bit, fixture hole and wrench size for 1/4 to 3/4 in and on the stainless torques (4, 30, 65, 80, 150). The 1 in size is carbon steel only on the sheet read. Stocked lengths (anchor length in inches, carbon steel, drill bit equal to the nominal diameter) are from the product-data table: 1/4 in: 1-3/4, 2-1/4, 3-1/4; 3/8 in: 2-3/4, 3, 3-1/2, 3-3/4, 5, 7; 1/2 in: 3-3/4, 4-1/4, 4-3/4, 5-1/2, 7, 8-1/2, 10; 5/8 in: 4-1/2, 5, 6, 7, 8-1/2, 10; 3/4 in: 5-1/2, 6-1/4, 7, 8-1/2, 10; 1 in: 7, 10, 13.
- Left out on purpose: nominal embedment, minimum hole depth, critical and minimum edge distance, spacing and concrete thickness. The catalog's design table was read as flattened text in which the values could not be aligned to diameters (for example twelve embedment values for the stainless sheet), and the product-data thread lengths use mixed numbers that the text read ran together, so none is given. Read them from the Simpson catalog or the ICC-ES report for the anchor you use. Load values are not given. Torque is the setting torque after the anchor is set in concrete; Simpson's sheet gives it for concrete installation.
- Not on this page: the clip, wedge and washer geometry (not given as numbers by the sources read), and other wedge anchors (Hilti Kwik Bolt TZ2, Red Head, Powers). No file: a wedge anchor is a rod with a thread and a clip; no complete set of numbers was read. Simpson's product page is linked as the maker source (CAD / BIM downloads are listed there where offered); expansion plugs for masonry are on ribbed-plastic-expansion-anchors.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| drill bit | equal to the anchor diameter: 1/4, 3/8, 1/2, 5/8, 3/4, 1 in carbide bit | hole in concrete drilled to the nominal diameter | designed | all |
| min fixture hole | 5/16, 7/16, 9/16, 11/16, 7/8, 1-1/8 in for 1/4, 3/8, 1/2, 5/8, 3/4, 1 in | clearance hole in the base plate or fixture | designed | all |

## Sizes

| anchor dia (in) | length (in) | drill bit (in) | min fixture hole (in) | wrench size (in) | installation torque (ft-lbf) |
|---|---|---|---|---|---|
| 1/4 | — | 1/4 | 5/16 | 7/16 | 4 (carbon) / 4 (stainless) |
| 3/8 | — | 3/8 | 7/16 | 9/16 | 30 (carbon) / 30 (stainless) |
| 1/2 | — | 1/2 | 9/16 | 3/4 | 60 (carbon) / 65 (stainless) |
| 5/8 | — | 5/8 | 11/16 | 15/16 | 90 (carbon) / 80 (stainless) |
| 3/4 | — | 3/4 | 7/8 | 1-1/8 | 150 (carbon) / 150 (stainless) |
| 1 | — | 1 | 1-1/8 | 1-1/2 | 230 (carbon) / — (stainless) |
| 1/4 | 1-3/4, 2-1/4, 3-1/4 | 1/4 | — | — | — |
| 3/8 | 2-3/4, 3, 3-1/2, 3-3/4, 5, 7 | 3/8 | — | — | — |
| 1/2 | 3-3/4, 4-1/4, 4-3/4, 5-1/2, 7, 8-1/2, 10 | 1/2 | — | — | — |
| 5/8 | 4-1/2, 5, 6, 7, 8-1/2, 10 | 5/8 | — | — | — |
| 3/4 | 5-1/2, 6-1/4, 7, 8-1/2, 10 | 3/4 | — | — | — |
| 1 | 7, 10, 13 | 1 | — | — | — |

## Where the files are

- Simpson Strong-Tie (catalog pages 110-111, hosted by Fasteners Plus): [Strong-Bolt 2 wedge anchor: installation data (drill bit, minimum fixture hole, wrench size, torque) and carbon steel product data by size × length](https://www.fastenersplus.com/cdn/shop/files/C-A-2016-Strong-Bolt2-designinfo.pdf) — web — Maker catalog pages; numbers only
- Simpson Strong-Tie (catalog page 111, hosted on a Shopify CDN): [Strong-Bolt 2 wedge anchor, stainless steel: installation data and torque (cross-check)](https://cdn.shopify.com/s/files/1/0398/5188/4705/files/Strong-Bolt_2_Wedge_Anchor_-_Stainless_Steel.pdf) — web — Maker catalog pages; numbers only
- Simpson Strong-Tie: [Strong-Bolt 2 wedge anchor product page (technical data and CAD / BIM downloads where offered)](https://www.strongtie.com/products/anchorsystems/mechanical/strong-bolt2/index.html) — web — Publisher's page; dimensions are facts

## Questions

**What drill bit for a 1/2 in wedge anchor?**

A 1/2 in carbide bit (drill bit equals the anchor diameter); minimum fixture hole 9/16 in, wrench 3/4 in, torque 60 ft-lbf carbon steel and 65 ft-lbf stainless (Simpson Strong-Bolt 2).

**What lengths does a 3/8 Strong-Bolt 2 come in?**

2-3/4, 3, 3-1/2, 3-3/4, 5 and 7 in in the carbon-steel product data.

**What is the installation torque for a 3/4 in wedge anchor?**

150 ft-lbf (both carbon and stainless), with a 7/8 in minimum fixture hole and a 1-1/8 in wrench.

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