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These standoffs, which use the proven self-clinching design, install with a squeeze in properly sized round holes - and become permanently mounted in the thin sheet.

When blind-threaded types are used, outer sheet surfaces are not only flush, but closed as well.

If you require a standoff which we do not offer in this bulletin, please contact us. We will be happy to work with you to satisfy your special need.
Blind Threaded Standoffs - Types BSO, BSOA, BSOS
Blind Threaded Standoffs - Types BSO, BSOA, BSOS 2
Unit of Measure
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Part #

Thread Size

Hole Size in Sheet + .003 - .000

C + .000 - .005

F Min.

H Nom.

L - Length +.002 –.005

Fastener Material

Standard Finish

CAD

BSO-440-10ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .156 in N/A .187 in N/A .312 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-12ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .156 in N/A .187 in N/A .375 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-14ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .187 in N/A .187 in N/A .437 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-16ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .250 in N/A .187 in N/A .500 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-18ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .250 in N/A .187 in N/A .562 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-20ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .250 in N/A .187 in N/A .625 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-22ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .375 in N/A .187 in N/A .687 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-24ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .375 in N/A .187 in N/A .750 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-26ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .375 in N/A .187 in N/A .812 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-28ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .375 in N/A .187 in N/A .875 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-30ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .375 in N/A .187 in N/A .937 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-32ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .375 in N/A .187 in N/A 1.00 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-440-34ZI N/A .112-40 (#4-40) N/A .166 in N/A .165 in N/A .375 in N/A .187 in N/A 1.062 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-10ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .156 in N/A .250 in N/A .312 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-12ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .156 in N/A .250 in N/A .375 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-14ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .187 in N/A .250 in N/A .437 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-16ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .250 in N/A .250 in N/A .500 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-18ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .250 in N/A .250 in N/A .562 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-20ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .250 in N/A .250 in N/A .625 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-22ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .375 in N/A .250 in N/A .687 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-24ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .375 in N/A .250 in N/A .750 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-26ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .375 in N/A .250 in N/A .812 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-28ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .375 in N/A .250 in N/A .875 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-30ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .375 in N/A .250 in N/A .937 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
BSO-6440-32ZI N/A .112-40 (#4-40) N/A .213 in N/A .212 in N/A .375 in N/A .250 in N/A 1.00 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
Unit of Measure
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