# Hollow-wall anchors: SNAPTOGGLE strap toggles, wing and spring toggle bolts, molly anchors, E-Z Ancor self-drilling — hole size, screw size, grip range

> What size hole do I drill for a 1/4-20 toggle bolt or a SNAPTOGGLE BB, and what wall thickness does a 3/16 molly anchor grip?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: Toggler SNAPTOGGLE datasheet and Eugene Fastener's hole-size chart (they disagree for BE / BC / BD), Bolt Depot and Cobra Anchors for molly anchors (they disagree on the hole), ITW Buildex E-Z Ancor selector; numbers only, load ratings left out on purpose
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**Exact dimensions.** True size, with no tolerance added.

## Notes

- Hole size is the drill bit the maker or distributor prints, in inches with the mm conversion (computed × 25.4). Grip range is the wall or ceiling thickness the anchor is rated to clamp. A toggle's channel or wing is wider than the hole by design: it folds to pass through, then opens behind the board.
- SNAPTOGGLE (the Toggler strap-toggle anchor): the datasheet prints 1/2 in for BA and BB (3/16-24 and 1/4-20) and 3/4 in for BE, BC and BD (5/16-18, 3/8-16, 1/2-13); Eugene Fastener's chart prints 1/2 in for BA / BB but 5/8 in for BE, BC and BD, so both are shown. Check the pack of the anchor you buy. The datasheet also prints threads per anchor and the minimum clearance behind the wall (1-7/8 in, 48 mm) and gives the bolt length as wall thickness + thickness of the fixture + 1/2 in; it gives no minimum wall thickness, so none is shown.
- Wing and plastic spring toggle bolts: Eugene Fastener prints one hole size per bolt size (1/8 → 3/8, 3/16 → 1/2, 1/4 → 5/8, 5/16 → 3/4, 3/8 → 7/8, 1/2 → 1 in) for both types.
- Molly (hollow-wall) anchors: the two sources agree on the grip ranges (e.g. 1/8 SR 1/8 – 1/2 in, 3/16 SR 1/8 – 5/8 in, 1/4 SR 1/8 – 5/8 in; 1/8 XLR 1-1/4 – 1-1/2 in) except that Cobra also lists 1/8 SL and 1/8 SHH sizes that Bolt Depot does not, and they disagree on the drill: Bolt Depot 1/4 in (1/8 SR), 3/8 in (3/16 SR), 1/2 in (1/4 SR); Cobra Anchors 5/16 in for the 1/8 and 3/16 sizes and 7/16 in for the 1/4 sizes (and 6-32 / 1/4-20 bolts). SR / LR / XLR are short / long / extra-long reach; XSR is extra short. Bolt Depot leaves the hole blank on the LR and XLR rows (same hole as the SR size is not stated), so none is shown for those.
- E-Z Ancor self-drilling drywall anchors are screwed into the board with a Phillips driver and need no pilot hole; the selector lists the maximum fixture thickness and the sheet-metal screw sizes accepted (#6, #7, #8). The family thickness list is 3/8, 1/2 and 5/8 in gypsum wallboard. The E-Z Toggle 5017 series (large-washer-face screw) is left out because its fixture thickness and screw size could not be mapped reliably in the text read. Plastic ribbed wall plugs for solid walls: ribbed-plastic-expansion-anchors.
- Not on this page: pull-out and shear ratings (every source prints them; they depend on the board, its thickness and the load direction), toggle wing dimensions, Rawlplug and fischer cavity-wall fixings (the Rawlplug sheet read printed no dimension rows; only a 2 – 38 mm board thickness range). No file: channels, wings and anchor bodies are not defined by published numbers in these sheets. McMaster-Carr sells wall bolts and plaster anchors with per-part STEP; its categories are linked, not copied.

## Sizes

| type | code / size | screw / thread | hole (drill) size | grip or wall thickness range | other | source |
|---|---|---|---|---|---|---|
| SNAPTOGGLE strap toggle (UNC) | BA | 3/16-24 | 1/2 in (12.70 mm), both sources | 3/8 – 3-5/8 in | min clearance behind wall 1-7/8 in (48 mm) | Toggler datasheet + Eugene Fastener |
| SNAPTOGGLE strap toggle (UNC) | BB | 1/4-20 | 1/2 in (12.70 mm), both sources | 3/8 – 3-5/8 in | min clearance behind wall 1-7/8 in (48 mm) | Toggler datasheet + Eugene Fastener |
| SNAPTOGGLE strap toggle (UNC) | BE | 5/16-18 | 3/4 in (19.05 mm) per toggler sheet; 5/8 in (15.88 mm) per Eugene Fastener | 3/8 – 2-1/2 in | min clearance behind wall 1-7/8 in (48 mm) | Toggler datasheet + Eugene Fastener |
| SNAPTOGGLE strap toggle (UNC) | BC | 3/8-16 | 3/4 in (19.05 mm) per toggler sheet; 5/8 in (15.88 mm) per Eugene Fastener | 3/8 – 2-1/2 in | min clearance behind wall 1-7/8 in (48 mm) | Toggler datasheet + Eugene Fastener |
| SNAPTOGGLE strap toggle (UNC) | BD | 1/2-13 | 3/4 in (19.05 mm) per toggler sheet; 5/8 in (15.88 mm) per Eugene Fastener | 3/8 – 2-1/2 in | min clearance behind wall 1-7/8 in (48 mm) | Toggler datasheet + Eugene Fastener |
| SNAPTOGGLE strap toggle (metric) | BM5 | M5 × 0.8 | 13 mm | 10 – 92 mm | min clearance behind wall 48 mm | SNAPTOGGLE datasheet |
| SNAPTOGGLE strap toggle (metric) | BM6 | M6 × 1.0 | 13 mm | 10 – 92 mm | min clearance behind wall 48 mm | SNAPTOGGLE datasheet |
| SNAPTOGGLE strap toggle (metric) | BM8 | M8 × 1.25 | 19 mm | 10 – 64 mm | min clearance behind wall 48 mm | SNAPTOGGLE datasheet |
| SNAPTOGGLE strap toggle (metric) | BM10 | M10 × 1.5 | 19 mm | 10 – 64 mm | min clearance behind wall 48 mm | SNAPTOGGLE datasheet |
| SNAPTOGGLE strap toggle, long | BAL (long) | 3/16-24 | 1/2 in (12.70 mm) | 2 – 9-1/2 in | min clearance behind wall 1-7/8 in | SNAPTOGGLE datasheet |
| SNAPTOGGLE strap toggle, long | BBL (long) | 1/4-20 | 1/2 in (12.70 mm) | 2 – 9-1/2 in | min clearance behind wall 1-7/8 in | SNAPTOGGLE datasheet |
| Wing or plastic spring toggle bolt | 1/8 in bolt | 1/8 in | 3/8 in (9.52 mm) | — | — | Eugene Fastener chart |
| Wing or plastic spring toggle bolt | 3/16 in bolt | 3/16 in | 1/2 in (12.70 mm) | — | — | Eugene Fastener chart |
| Wing or plastic spring toggle bolt | 1/4 in bolt | 1/4 in | 5/8 in (15.88 mm) | — | — | Eugene Fastener chart |
| Wing or plastic spring toggle bolt | 5/16 in bolt | 5/16 in | 3/4 in (19.05 mm) | — | — | Eugene Fastener chart |
| Wing or plastic spring toggle bolt | 3/8 in bolt | 3/8 in | 7/8 in (22.22 mm) | — | — | Eugene Fastener chart |
| Wing or plastic spring toggle bolt | 1/2 in bolt | 1/2 in | 1 in (25.40 mm) | — | — | Eugene Fastener chart |
| Hollow-wall (molly) anchor | 1/8 XSR | 6-32 (Cobra) | Bolt Depot: 5/16 in; Cobra: 5/16 in | 1/16 – 1/4 in | — | Bolt Depot + Cobra Anchors (they disagree on the hole) |
| Hollow-wall (molly) anchor | 1/8 SR | 6-32 (Cobra) | Bolt Depot: 1/4 in; Cobra: 5/16 in | 1/8 – 1/2 in | — | Bolt Depot + Cobra Anchors (they disagree on the hole) |
| Hollow-wall (molly) anchor | 1/8 LR | 6-32 (Cobra) | Bolt Depot: — in; Cobra: 5/16 in | 5/8 – 7/8 in | — | Bolt Depot + Cobra Anchors (they disagree on the hole) |
| Hollow-wall (molly) anchor | 1/8 XLR | 6-32 (Cobra) | Bolt Depot: — in; Cobra: 5/16 in | 1-1/4 – 1-1/2 in | — | Bolt Depot + Cobra Anchors (they disagree on the hole) |
| Hollow-wall (molly) anchor | 3/16 SR | 6-32 (Cobra) | Bolt Depot: 3/8 in; Cobra: 5/16 in | 1/8 – 5/8 in | — | Bolt Depot + Cobra Anchors (they disagree on the hole) |
| Hollow-wall (molly) anchor | 3/16 LR | 6-32 (Cobra) | Bolt Depot: — in; Cobra: 5/16 in | 5/8 – 1-3/16 in | — | Bolt Depot + Cobra Anchors (they disagree on the hole) |
| Hollow-wall (molly) anchor | 3/16 XLR | 6-32 (Cobra) | Bolt Depot: — in; Cobra: 5/16 in | 1-1/4 – 1-3/4 in | — | Bolt Depot + Cobra Anchors (they disagree on the hole) |
| Hollow-wall (molly) anchor | 1/4 SR | 1/4-20 (Cobra) | Bolt Depot: 1/2 in; Cobra: 7/16 in | 1/8 – 5/8 in | — | Bolt Depot + Cobra Anchors (they disagree on the hole) |
| Hollow-wall (molly) anchor | 1/4 LR | 1/4-20 (Cobra) | Bolt Depot: — in; Cobra: 7/16 in | 5/8 – 1-3/16 in | — | Bolt Depot + Cobra Anchors (they disagree on the hole) |
| Hollow-wall (molly) anchor | 1/4 XLR | 1/4-20 (Cobra) | Bolt Depot: — in; Cobra: — in | 1-1/4 – 1-3/4 in | — | Bolt Depot + Cobra Anchors (they disagree on the hole) |
| E-Z Ancor self-drilling drywall anchor | E-Z Lite | #6 | none: self-drilling, no pilot hole | wallboard 3/8, 1/2 or 5/8 in (sheet's thickness list for the family) | max fixture thickness 3/4 in | ITW Buildex selector (white nylon) |
| E-Z Ancor self-drilling drywall anchor | E-Z Mini | #6, #7 | none: self-drilling, no pilot hole | wallboard 3/8, 1/2 or 5/8 in (sheet's thickness list for the family) | max fixture thickness 3/4 in | ITW Buildex selector (zinc) |
| E-Z Ancor self-drilling drywall anchor | Stud Solver | #8 (the screw supplied only) | none: self-drilling, no pilot hole | wallboard 3/8, 1/2 or 5/8 in (sheet's thickness list for the family) | max fixture thickness 3/4 in | ITW Buildex selector (zinc) |
| E-Z Ancor self-drilling drywall anchor | E-Z Zinc | #6, #7 or #8 | none: self-drilling, no pilot hole | wallboard 3/8, 1/2 or 5/8 in (sheet's thickness list for the family) | max fixture thickness 3/4 in | ITW Buildex selector (zinc) |
| E-Z Ancor self-drilling drywall anchor | E-Z Plastic Plus | #6, #7 or #8 | none: self-drilling, no pilot hole | wallboard 3/8, 1/2 or 5/8 in (sheet's thickness list for the family) | max fixture thickness 3/4 in | ITW Buildex selector (white nylon) |
| E-Z Ancor self-drilling drywall anchor | Twist-N-Lock | #8 | none: self-drilling, no pilot hole | wallboard 3/8, 1/2 or 5/8 in (sheet's thickness list for the family) | max fixture thickness 3/4 in | ITW Buildex selector (white nylon) |
| E-Z Ancor self-drilling drywall anchor | E-Z Toggle (5014 series) | #8 × 2-1/8 pan SMS supplied | none: self-drilling, no pilot hole | wallboard 3/8, 1/2 or 5/8 in (sheet's thickness list for the family) | max fixture thickness 1/2 in | ITW Buildex selector (zinc) |

## Where the files are

- SNAPTOGGLE heavy duty toggle bolts datasheet (hosted on a Shopify CDN): [SNAPTOGGLE metric and UNC anchors: drill bit diameter, thread size, threads per anchor, grip range, minimum clearance behind the wall; bolt length rule](https://cdn.shopify.com/s/files/1/2175/8813/files/SNAPTOGGLE_-Heavy-Duty-Toggle-Bolts.pdf) — web — Maker datasheet; numbers only
- Eugene Fastener: [Toggle bolt drill bit and hole size chart: wing and spring toggles by bolt size; SNAPTOGGLE codes BA to BD](https://www.eugenefast.com/Home/Page/resources/toggle-bolt-drill-bit-and-hole-size-chart) — web — Distributor page; numbers only
- Bolt Depot: [Hollow wall anchors: size, hole size, grip range (XSR / SR / LR / XLR)](https://boltdepot.com/fastener-information/Anchoring-Products/Hollow-Wall-Anchor-Info) — web — Distributor page; numbers only
- Cobra Anchors: [Hollow wall anchor specification sheet: sizes, bolt diameter, drill size, grip range (loads left out)](https://assets.unilogcorp.com/187/ITEM/DOC/COBRA_ANCHORS_100008435_Specification_Sheet.pdf) — web — Maker sheet; numbers only
- ITW Buildex (E-Z Ancor): [E-Z Ancor self-drilling drywall anchors product data: selector guide with anchor, material, maximum fixture thickness, accepted sheet-metal screw sizes](https://www.buildsite.com/pdf/itwbuildex/E-Z-ANCOR-Self-Drilling-Drywall-Anchors-Product-Data-2964390.pdf) — web — Maker datasheet; numbers only
- Eugene Fastener (E-Z Ancor sheet): [E-Z Ancor anchors: gypsum wallboard thickness 3/8, 1/2, 5/8 in; #6 / #7 / #8 screws; Stud Solver #8](https://eugenefast.com/images/pdf/EZANCHORS.pdf) — web — Distributor sheet; numbers only
- McMaster-Carr: [Wall bolts (toggle and hollow-wall anchors) (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/wall-bolts/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- McMaster-Carr: [Plaster anchors (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/plaster-anchors/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Questions

**What drill bit for a 1/4-20 SNAPTOGGLE (BB)?**

1/2 in (12.7 mm) in both the datasheet and Eugene Fastener's chart; grip range 3/8 – 3-5/8 in.

**What drill bit for a 1/4 in wing or spring toggle bolt?**

5/8 in (Eugene Fastener's chart). A 1/8 in bolt takes 3/8 in, a 3/16 in bolt 1/2 in, a 5/16 in bolt 3/4 in, a 3/8 in bolt 7/8 in, a 1/2 in bolt 1 in.

**What hole size for a 3/16 molly anchor?**

The sources disagree: Bolt Depot 3/8 in (3/16 SR); Cobra Anchors 5/16 in. Check the anchor's pack.

**Do E-Z Ancor self-drilling anchors need a pilot hole?**

No; they are self-drilling and turn into 3/8, 1/2 or 5/8 in drywall with a Phillips driver, taking #6, #7 or #8 sheet-metal screws depending on the model.

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