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NS – Notched Stud Backing

Notched Stud Backing (NS) is used for bracing and bridging of joists and wall studs in heavy load conditions. NS is also used in hospitals and schools as mechanical backing to provide superior support for equipment and cabinetry. Engineered section properties and allowable loads are provided based on 2004 AISI.

NS Clip

Features and Benefits

  • Available in widths of 4″, 6″, and 8″
  • Available in 12″, 16″, and 24″ stud spacing
  • Excellent for heavy load conditions
  • Pre-cut notches for flange attachment
  • Pre-punched guide holes
  • Eliminates field cutting
  • Provides bracing and bridging support
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NS Submittal Download

Material Composition

  • Mill certified steel
  • ASTM: A653/A653M
  • 33 mil
    – 33 ksi yield strength
    – 45 ksi tensile strength
    – G60/G90 galvanized coating
  • 43 mil
    – 33 ksi yield strength
    – 45 ksi tensile strength
    – G60/G90 galvanized coating
  • 54 mil
    – 57 ksi yield strength
    – 65 ksi tensile strength
    – G60/G90 galvanized coating
  • 68 mil
    – 57 ksi yield strength
    – 65 ksi tensile strength
    – G60/G90 galvanized coating

 

Nomenclature

NS Clip Nomenclature

Gallery

Section Properties

1/2″ Flange NS Section Properties – Per AISI Design Criteria
Backing
Member		 Thickness
(mils)		 Thickness
(ga)		 Depth
(in)		 Flange
(in)		 Fy
(ksi)		 Ixe (min)(In4) Sxe (min)(In3) Iye (min)(In4) Sye (min)(In3)
4″, 33 mil 33 20 4 0.50 33 0.386 0.193 0.007 0.018
4″, 43 mil 43 18 4 0.50 33 0.495 0.248 0.008 0.022
4″, 54 mil 54 16 4 0.50 50 0.603 0.301 0.009 0.025
4″, 68 mil 68 14 4 0.50 50 0.728 0.364 0.011 0.029
6″, 33 mil 33 20 6 0.50 33 1.085 0.357 0.007 0.018
6″, 43 mil 43 18 6 0.50 33 1.416 0.472 0.009 0.022
6″, 54 mil 54 16 6 0.50 50 1.736 0.579 0.010 0.026
6″, 68 mil 68 14 6 0.50 50 2.116 0.705 0.012 0.030
8″, 33 mil 33 20 8 0.50 33 2.214 0.526 0.007 0.018
8″, 43 mil 43 18 8 0.50 33 2.989 0.738 0.009 0.022
8″, 54 mil 54 16 8 0.50 50 3.727 0.932 0.011 0.026
8″, 68 mil 68 14 8 0.50 50 4.569 1.142 0.012 0.030
1″ Flange NS Section Properties – Per AISI Design Criteria
Backing
Member		 Thickness
(mils)		 Thickness
(ga)		 Depth
(in)		 Flange
(in)		 Fy
(ksi)		 Ixe (min)(in4) Sxe (min)(in3) Iye (min)(in4) Sye (min)(in3)
4″, 33 mil 33 20 4 1.00 33 0.522 0.261 0.033 0.046
4″, 43 mil 43 18 4 1.00 33 0.672 0.336 0.041 0.058
4″, 54 mil 54 16 4 1.00 50 0.823 0.411 0.050 0.070
4″, 68 mil 68 14 4 1.00 50 1.003 0.501 0.059 0.082
6″, 33 mil 33 20 6 1.00 33 1.371 0.445 0.036 0.047
6″, 43 mil 43 18 6 1.00 33 1.816 0.605 0.046 0.060
6″, 54 mil 54 16 6 1.00 50 2.236 0.745 0.056 0.072
6″, 68 mil 68 14 6 1.00 50 2.742 0.914 0.066 0.085
8″, 33 mil 33 20 8 1.00 33 2.687 0.626 0.037 0.047
8″, 43 mil 43 18 8 1.00 33 3.610 0.872 0.048 0.060
8″, 54 mil 54 16 8 1.00 50 4.492 1.092 0.058 0.072
8″, 68 mil 68 14 8 1.00 50 5.690 1.423 0.070 0.086

Allowable Loads

Part No. Stud Properties Vertical Pmax (lb) Spacing # Of Screws Required for Vertical Pmax Spacing Horizontal Pmax (lb) Spacing # Of Screws Required for Horizontal Pmax Spacing
Mil Gauge Fy (ksi) 12″ 16″ 24″ 12″ 16″ 24″ 12″ 16″ 24″ 12″ 16″ 24″
400NS050-*-S??-33 33 20 33 976 933 622 6 6 4 112 84 56 2 2 2
400NS050-*-S??-43 43 18 33 1740 1593 1062 7 7 5 144 108 72 2 2 2
400NS050-*-S??-54 54 16 50 3372 2934 1956 7 6 4 248 186 124 2 2 2
400NS050-*-S??-68 68 14 50 4716 3537 2358 10 8 5 284 213 142 2 2 2
600NS050-*-S??-33 33 20 33 638 638 638 4 4 4 112 84 56 2 2 2
600NS050-*-S??-43 43 18 33 1416 1416 1416 6 6 6 140 105 70 2 2 2
600NS050-*-S??-54 54 16 50 2823 2823 2706 6 6 6 248 186 124 2 2 2
600NS050-*-S??-68 68 14 50 5350 5268 3512 11 11 8 284 213 142 2 2 2
800NS050-*-S??-33 33 20 33 474 474 474 3 3 3 112 84 56 2 2 2
800NS050-*-S??-43 43 18 33 1051 1051 1051 3 4 4 144 108 72 2 2 2
800NS050-*-S??-54 54 16 50 2091 2091 2091 5 5 5 252 189 126 2 2 2
800NS050-*-S??-68 68 14 50 4221 4221 4221 9 9 9 288 216 144 2 2 2
400NS100-*-S??-33 33 20 33 976 976 860 6 6 5 288 216 144 4 3 2
400NS100-*-S??-43 43 18 33 1739 1739 1280 7 7 5 372 279 186 4 3 2
400NS100-*-S??-54 54 16 50 3372 3372 2398 7 7 5 680 510 340 4 3 2
400NS100-*-S??-68 54 16 50 4871 4533 3022 10 10 7 816 612 408 4 3 2
600NS100-*-S??-33 33 20 33 638 638 638 4 4 4 288 216 144 4 3 2
600NS100-*-S??-43 43 18 33 1416 1416 1416 6 6 6 376 282 188 4 3 2
600NS100-*-S??-54 54 16 50 2823 2823 2823 6 6 6 688 516 344 4 3 2
600NS100-*-S??-68 68 14 50 5350 5350 4554 11 11 10 828 621 414 4 3 2
800NS100-*-S??-33 33 20 33 474 474 474 3 3 3 292 219 146 4 3 2
800NS100-*-S??-43 43 18 33 1051 1051 1051 4 4 4 380 285 190 4 3 2
800NS100-*-S??-54 54 16 50 2091 2091 2091 4 4 4 692 519 346 4 3 2
800NS100-*-S??-68 54 16 50 4221 4221 4221 9 9 9 832 624 416 4 3 2

Table Notes

  1. 1Web-height to thickness ratio exceeds 200. Web stiffeners are required at all support points and concentrated loads.
  2. Maximum point load, Pmax, is determined based on the minimum of the shear capacity or the bending capacity of the blocking/Part No., or the number of screws with proper edge distance/spacing that may be installed. Load assumed to act at mid-span through centroid of Part No., based on a span of 24″. For stud spacing of 16″ oc, above tables may conservatively be used.
  3. Number of screws determined by dividing Pmax by capacity of #10 screw and rounding up. Screw manufacturer shall confirm that their screws meet the code allowable capacity indicated in the table.
  4. Screw capacity based on stud material with thickness and yields strength equal to the blocking/Part No. Minimum screw spacing and edge distance shall not be less than 3 times the nominal screw diameter (per SSMA). For #10 screw, 3 x d = 3 x 0. 190″ = 0.57″.
  5. The properties indicated in the table have been calculated using CFS version 5.0.2 (RSG Software Inc.)
  6. Tabulated values do not consider stud capacity. Studs designed by others.
  7. All calculations per 2016 AISI.