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|  MIL-S-21041C
*3.2.2.
Unit A, Type 5, shall be formed slotted aluminum angle alloy No. 5052H34 (QQ-A-250/8) with a
minimum yield of 31,000 psi.
3.2.3
Length. Unit A, all types shall be supplied in lengths of 10, 12, or 15 feet or special lengths when
required for a specific design purpose as specified in 6.2.2.
3.2.4
Camber. Camber, if any, of the slotted metal angle shall not exceed 3/16 inch in a length of 10 feet.
3.2.5
Hole Pattern. The hole pattern for the 1 1/2" x 1 1/2" angle shall be of such design as to provide one
line of holes and/or slots in each flange; the 1 1/2" x 2 1/4" angle shall have one line of holes and slots in the
narrow flange and two lines of holes and slots in the wide flange; the 1 1/2" x 3" angle shall have one line of holes
and slots in the narrow flange, and three lines of holes and slots in the wide flange. The hole pattern shall be of
continual repetition and shall be visibly indexed at 3" intervals.
3.3
Unit B.
*3.3.1
Unit B, Types 1 and 2. Panels shall be of steel sheet conforming to QQ-S-698 (Minimum Skin-passed
Temper) or QQ-S-775, Class d (Minimum Cold Rolled Soft No. 4 Temper) formed with channeled sides and open
ends. Slotted bolt holes shall be made in the underneath flange of the channel to receive the bolt specified in 3.4.1.
*3.3.2
Unit B, Types 3, 4, 5, 6 and 7 shall be sheet steel conforming to QQ-S-698 (Minimum Skin-passed
Temper) or QQ-S-775, Class d (Minimum Cold Rolled Soft No. 4 Temper) formed with channeled sides and
closed boxed ends. Slotted bolt holes shall be made in the underneath flange of the channel and along each corner
portion of the outer edge of the channel for bolts specified in 3.4.1.
3.3.3
Length. Unit B, all types shall be supplied in standard lengths of 6" increments between 30 and 60
inches as specified in 6.2.2.
3.4
Accessories.
*3.4.1
Nuts and bolts. Nuts and bolts shall be of hardened steel. The bolts shall be minimum 5/16" shank
diameter, 5/8" length for Unit A, Type 1, 2, 5 and 3/4" length for Type 3 and 4 and 9/16" hexagon head. Bolts
shall have an unthreaded load bearing shoulder to prevent shearing action on the threads. The nuts shall be 9/16"
across the hexagon flats and shall have a class 2 fit when engaged with the bolts. One mating surface shall be
knurled to improve fastness. All nuts and bolts shall be finish treated in accordance with Para 3.5.1, Class 2.
When specified (see 6.2) the nuts supplied shall be of the self-locking type, conforming to MIL-N-45913 Type 1,
Grade A, to prevent loosening after extended storage/handling and vibration during shipment of assembled slotted
angle structures.
3.5
Surface Finish. The surface finish of material furnished under this specification shall be free from
grease, oil, scale, rust or other extraneous matter. All exposed edges shall be rounded , beveled, deburred, or
fabricated in such a manner to prevent injury to the users hands.
3.5.1
The following classes of finish shall be applicable to material furnished under this specification.
Procuring agencies shall specify the class of finish desired (see 6.2.2 and 6.1).
4
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