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1/4 socket head cap screw envelope

1/4 socket head cap screw envelope: head Ø9.52 mm (A max 0.375 in) x 6.35 mm (H max 0.250 in), hex socket 3/16 in across flats x 0.120 in deep (key engagement min), plain Ø6.350 mm shank (D max), example length under the head 1.0 in (Xem's choice); no thread, top chamfer, fillet or socket cone

Exact dimensions. True size, no tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

size1/4
TPI UNC / UNF20 / 28
body D max / min (in)0.2500 / 0.2435
head A max / min (in)0.375 / 0.365
head height H max / min (in)0.250 / 0.244
hex socket nominal3/16 in
key engagement T min (in)0.120
wall min (in)0.095
fillet transition dia max / min (in)0.278 / 0.262
top chamfer max (in)0.025
bottom chamfer max (in)0.010
basic thread length LT (in)1.000
D max (mm, computed)6.350
head dia x height max (mm, computed)9.52 x 6.35
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From the full sheet

Socket head cap screws, inch #0 to 1-1/2 (ASME B18.3): head, hex socket, key engagement — full size table + models #0 to 1: every size, notes, mating features and sources. What are the head diameter, head height and hex key size of a #4-40, #8-32, 1/4-20, 5/8-11 or 1 in socket head cap screw?

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