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7/8 hex lag screw envelope
7/8 hex lag screw envelope: hex head 1.3125 in across flats (basic) × 0.5781 in high (basic) on a plain Ø22.22 mm (7/8 in nominal) shank, example length 4 in (101.6 mm) under the head (Xem's choice); no thread, chamfer, washer face or point
Exact dimensions. True size, no tolerance added. Threads are plain cylinders at the major diameter.
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Dimensions
| size (in) | 7/8 |
|---|---|
| TPI | 4 |
| shank E max / min (in) | .895 / .852 |
| across flats F, basic | 1-5/16 |
| F max / min (AFT) | 1.312 / 1.269 |
| F (Engineers Edge) | '15/16' printed; max / min 1.312 / 1.269 |
| across corners G max / min (AFT) | 1.516 / 1.447 |
| head height H, basic | 37/64 |
| H max / min | .604 / .531 |
| shoulder S min (AFT) | .375 |
| shank hole (Fastenermart) | — |
| pilot, softwood III & IV | — |
| pilot, medium II | — |
| pilot, hardwood I | — |
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Hex lag screws 5/8, 3/4, 7/8 and 1 in (ASME B18.2.1): head width and height, shank, pilot holes + envelope models: every size, notes, mating features and sources. What size is the head of a 3/4 lag screw, and what pilot hole does a 5/8 lag bolt need?