A-1 ALLOYS
A-1 ALLOYS INC.
3330 Beyer Bl. #F
San Diego, CA, 92173
Phone: 1-800-266-2569
Fax: (619) 591-2198
Email: a1sales@a1alloys.com
Website: www.birdprecision.com
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The HDS® Framing System is a high-performance, cost-effective, multipurpose, heavy-duty framing stud for headers, jambs, posts and built-up tube truss chords and webs. The superior strength and carrying capacity of the HDS® Framing System means higher performance with fewer members. It means eliminating box beam headers, nesting track and stud for posts and jambs, and eliminating multi-member built-up truss chords and webs. It also means improved finish quality by eliminating excessive materialmore
Unit of Measure

Specifications

Brands

 A-1 Alloys ClarkDietrich® HDS®

Thickness

 20 gauge33 mil

Design Thickness

 0.0713 in

Tensile Strength Fy

 50 ksi

Depth

 8 in

Flange Size

 3 in

Return

 2-1/4 in

Double Return

 3/4 in

Minimum Delivered Thickness

 0.0329 in

Unperforated Section Properties

Area

 0.679 in²

Weight

 2.31 lb/ft

Gross Moment of Inertia About X-Axis (Ix)

 6.134 in4

Gross Section Modulus About X-Axis (Sx)

 1.533 in³

Gross Radius of Gyration About X-Axis (Rx)

 3.005 in

Gross Moment of Inertia About Y-Axis (ly)

 1.122 in4

The Distance from the Web Centerline to the Center of Gravity (xbar)

 1.294 in

Gross Section Modulus About Y-Axis (Sy)

 0.665 in³

Gross Radius of Gyration About Y-Axis (ry)

 1.285 in

Torsional Properties

St. Venant Torsion Constant Torsional Properties (Jx1000)

 0.272 in4

Warping Torsion Constant (Cw)

 33.350 in6

Distance from Shear Center to the Centroid Along the Principal X-Axis (Xo)

 -3.412 in

Polar Radius of Gyration About the Centroidal Principal Axis (Ro)

 4.725 in

Distance from Shear Center to the Centroid Along the Principal X-Axis/Polar Radius of Gyration About the Centroidal Principal Axis 1-(Xo/ro)2

 0.479 Beta

Other Properties

Maximum Unbraced Length to Attain Mxa (Lu)

 113 in

Allowable Shear for Bending About X-Axis (Unperforated Vx)

 0.47 kips

Allowable Shear for Bending About Y-Axis (Vy)

 2.05 kips
Other Properties (Py)1 0.38 kips

Unperforated Bending Properties

Effective Section Modulus About X-Axis (Sxe) Unperforated Bending Properties

 1.084 in³

Allowable Moment About X-Axis (Mxa) Unperforated Bending Properties

 21420 in·lb

Effective Section Modulus About X-Axis (Sye) Unperforated Bending Properties (Web in Ten.)

 0.548 in³

Allowable Moment About Y-Axis (Mya) Unperforated Bending Properties (Web in Ten.)

 10829 in·lb

Effective Section Modulus About X-Axis (Sye) Unperforated Bending Properties (Web in Comp.)

 0.333 in³

Allowable Moment About Y-Axis (Mya) Unperforated Bending Properties (Web in Comp.)

 6570 in·lb

Effective Moment of Inertia

Effective Moment of Inertia About X-Axis for Deflection Calculations (lxe)

 5.805 in4

Effective Moment of Inertia About Y-Axis for Deflection Calculations (Web in Ten. (lye))

 1.076 in4

Effective Moment of Inertia About Y-Axis for Deflection Calculations (Web in Comp. (lye))

 0.703 in4

Construction Advantages

Construction Advantages
  • Outstanding bending strength in two directions.
  • Reduces installation time by 50%.
  • Eliminates box beam header assembly.
  • Reduces material and labor costs up to 50%.
  • HDS® can be screw-attached from either side.
  • Eliminates stud-to-track nesting for post, header and jamb studs.
  • Openings up to 15' wide.
  • Improves drywall finishing around doors and windows. No screw head buildup.
  • Superior axial strength.

Note

Note

 Indicates that h/t exceeds 200. Web stiffeners are required at bearing points. No holes in the web are permitted.

Standard material coating is CP60 per ASTM C955; G90 available.
  • 1 Allowable end one flange web crippling per AISI NASPEC, 2001 w/2004 supplement. This value assumes 2 flanges resist web crippling for a bearing length of 1-1/4".