Clipped F436 Washer
What It Does
When a nearby weld, fillet, or adjacent structural member leaves no room for a full round or beveled washer, a clipped hardened washer solves it. Part of the circular or beveled edge is trimmed flat so the washer fits the available space while keeping the hard bearing surface the connection requires. Clipped hardened washers are covered under ASTM F436.
Structural connections are often crowded. A bolt may sit close to a weld, a rolled fillet at the junction of a flange and web, a gusset, or another member framing into the same area. In those spots a full circular or beveled washer will not lie flat because its edge fouls the obstruction. Trimming one edge of the washer flat removes the interference while leaving the rest of the washer, and its hardened bearing surface around the bolt, intact. The result is a washer that seats properly in a location where a standard washer physically will not fit.
When to Use a Clipped Washer
A clipped F436 washer is used where edge clearance, not hole size or surface slope, is the limiting factor. If the obstruction is far enough away, a standard circular or beveled washer is preferred because it provides a full, symmetric bearing surface. The clip should remove no more material than necessary to clear the obstruction, and under ASTM F436 the clipped edge is kept a specified minimum distance from the center of the washer so that enough bearing area remains around the bolt.
Finishes and Material Types
Clipped F436 washers are available in plain and hot-dip galvanized finishes, with larger and special sizes manufactured to order. The finish and material type should match the bolt and nut used in the assembly.
Clipped Washer Dimensions
| Nominal Washer Size | I.D. min | I.D. max | O.D. min | O.D. max | Thickness Std min | Thickness Std max | Thickness X-Thick min | Thickness X-Thick max | Clipped Min Edge Distance (E) |
|---|---|---|---|---|---|---|---|---|---|
| 1/4″ | 0.281″ | 0.313″ | 0.593″ | 0.657″ | 0.051″ | 0.080″ | … | … | 0.219″ |
| 5/16″ | 0.344″ | 0.376″ | 0.656″ | 0.720″ | 0.051″ | 0.080″ | … | … | 0.281″ |
| 3/8″ | 0.406″ | 0.438″ | 0.781″ | 0.845″ | 0.051″ | 0.080″ | … | … | 0.344″ |
| 7/16″ | 0.469″ | 0.501″ | 0.890″ | 0.954″ | 0.051″ | 0.080″ | … | … | 0.406″ |
| 1/2″ | 0.531″ | 0.563″ | 1.031″ | 1.095″ | 0.097″ | 0.177″ | 0.305″ | 0.375″ | 0.438″ |
| 9/16″ | 0.625″ | 0.657″ | 1.156″ | 1.220″ | 0.110″ | 0.177″ | 0.305″ | 0.375″ | 0.500″ |
| 5/8″ | 0.688″ | 0.720″ | 1.281″ | 1.345″ | 0.122″ | 0.177″ | 0.305″ | 0.375″ | 0.563″ |
| 3/4″ | 0.813″ | 0.845″ | 1.436″ | 1.500″ | 0.122″ | 0.177″ | 0.305″ | 0.375″ | 0.656″ |
| 7/8″ | 0.938″ | 0.970″ | 1.718″ | 1.782″ | 0.136″ | 0.177″ | 0.305″ | 0.375″ | 0.781″ |
| 1″ | 1.063″ | 1.126″ | 1.937″ | 2.063″ | 0.136″ | 0.177″ | 0.305″ | 0.375″ | 1.000″ |
| 1-1/8″ | 1.188″ | 1.251″ | 2.187″ | 2.313″ | 0.136″ | 0.177″ | 0.305″ | 0.375″ | 1.094″ |
| 1-1/4″ | 1.375″ | 1.438″ | 2.437″ | 2.563″ | 0.136″ | 0.177″ | 0.305″ | 0.375″ | 1.219″ |
| 1-3/8″ | 1.500″ | 1.563″ | 2.687″ | 2.813″ | 0.136″ | 0.177″ | 0.305″ | 0.375″ | 1.313″ |
| 1-1/2″ | 1.625″ | 1.688″ | 2.937″ | 3.063″ | 0.136″ | 0.177″ | 0.305″ | 0.375″ | 1.531″ |
| 1-3/4″ | 1.875″ | 1.938″ | 3.312″ | 3.438″ | 0.178″ ᴮ | 0.28″ ᴮ | 0.305″ | 0.375″ | 1.750″ |
| 2″ | 2.125″ | 2.188″ | 3.687″ | 3.813″ | 0.178″ ᴮ | 0.28″ ᴮ | 0.305″ | 0.375″ | 2.000″ |
| 2-1/4″ | 2.375″ | 2.438″ | 3.937″ | 4.063″ | 0.24″ ᶜ | 0.34″ ᶜ | 0.305″ | 0.375″ | 2.188″ |
| 2-1/2″ | 2.625″ | 2.688″ | 4.437″ | 4.563″ | 0.24″ ᶜ | 0.34″ ᶜ | 0.313″ | 0.375″ | 2.406″ |
| 2-3/4″ | 2.875″ | 2.938″ | 4.937″ | 5.063″ | 0.24″ ᶜ | 0.34″ ᶜ | 0.313″ | 0.375″ | 2.625″ |
| 3″ | 3.125″ | 3.188″ | 5.437″ | 5.563″ | 0.24″ ᶜ | 0.34″ ᶜ | 0.313″ | 0.375″ | 2.875″ |
| 3-1/4″ | 3.375″ | 3.500″ | 5.875″ | 6.125″ | 0.24″ ᶜ | 0.34″ ᶜ | 0.313″ | 0.375″ | 3.063″ |
| 3-1/2″ | 3.625″ | 3.750″ | 6.375″ | 6.625″ | 0.24″ ᶜ | 0.34″ ᶜ | 0.313″ | 0.375″ | 3.313″ |
| 3-3/4″ | 3.875″ | 4.000″ | 6.875″ | 7.125″ | 0.24″ ᶜ | 0.34″ ᶜ | 0.313″ | 0.375″ | 3.500″ |
| 4″ | 4.125″ | 4.250″ | 7.375″ | 7.625″ | 0.24″ ᶜ | 0.34″ ᶜ | 0.313″ | 0.375″ | 3.500″ |
| Footnotes: A — Clipped edge E shall be not closer than 7/8 of the bolt diameter from the center of the washer. B — 9/16″ nominal. C — 1/4″ nominal. D — Nominal washer sizes are intended for use with fasteners of the same nominal thread size. | |||||||||
Availability
Available in plain and hot-dip galvanized finishes, with larger and special sizes manufactured to order.