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 material and screw head buildup around doors and windows.
Unit of Measure

Specifications

Brands

 N/A A-1 Alloys ClarkDietrich® HDS®

Thickness

 N/A 20 gauge33 mil

Design Thickness

 N/A 0.0451 in

Tensile Strength Fy

 N/A 33 ksi

Depth

 N/A 4 in

Flange Size

 N/A 3 in

Return

 N/A 1-1/16 in

Double Return

 N/A 3/4 in

Minimum Delivered Thickness

 N/A 0.0329 in

Unperforated Section Properties

Area

 N/A 0.458 in²

Weight

 N/A 1.56 lb/ft

Gross Moment of Inertia About X-Axis (Ix)

 N/A 1.175 in4

Gross Section Modulus About X-Axis (Sx)

 N/A 0.588 in³

Gross Radius of Gyration About X-Axis (Rx)

 N/A 1.601 in

Gross Moment of Inertia About Y-Axis (ly)

 N/A 0.656 in4

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

 N/A 1.386 in

Gross Section Modulus About Y-Axis (Sy)

 N/A 0.411 in³

Gross Radius of Gyration About Y-Axis (ry)

 N/A 1.196 in

Torsional Properties

St. Venant Torsion Constant Torsional Properties (Jx1000)

 N/A 0.183 in4

Warping Torsion Constant (Cw)

 N/A 5.146 in6

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

 N/A -3.422 in

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

 N/A 3.963 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

 N/A 0.254 Beta

Other Properties

Maximum Unbraced Length to Attain Mxa (Lu)

 N/A 100 in

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

 N/A 0.97 kips

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

 N/A 0.60 kips

Allowable Shear for Bending About Y-Axis (Vy)

 N/A 2.05 kips
Other Properties (Px)1 N/A 0.29 kips
Other Properties (Py)2 N/A 0.38 kips

Unperforated Bending Properties

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

 N/A 0.456 in³

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

 N/A 9011 in·lb

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

 N/A 0.406 in³

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

 N/A 8025 in·lb

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

 N/A 0.296 in³

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

 N/A 5854 in·lb

Perforated Bending Properties

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

 N/A 0.415 in³

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

 N/A 8199 in·lb

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

 N/A 0.344 in³

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

 N/A 6805 in·lb

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

 N/A 0.246 in³

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

 N/A 4853 in·lb

Effective Moment of Inertia

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

 N/A 1.074 in4

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

 N/A 0.656 in4

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

 N/A 0.542 in4

Construction Advantages

Construction Advantages

 N/A
  • 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

 N/A Standard material coating is CP60 per ASTM C955; G90 available.
  • 1 For members having a web depth of less than 8" and also having a thickness less than 97 mil, allowable web crippling per AISI Standard for CFS Wall Stud Design 2004. This value assumes the web resists web crippling and the HDS is nested in track having the same thickness. For other members, allowable end one flange web crippling per AISI NASPEC, 2001 with 2004 supplement. Both calculation procedures use a bearing length of 1-1/4".
  • 2 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".