Steel Construction Systems

Light Gauge Steel Framing

Home > Products > Backing, Blocking, and Stiffeners > NS – Notched Stud Backing

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

  • Pre-cut notches for flange attachment
  • Pre-drilled guide holes
  • Eliminates field cutting
  • Provides bracing and bridging support
thumbnail of NS

NS Submittal Download

Material Composition

  • ASTM A653 / A653M

Yield Strength

  • 30, 33, and 43 mil: 33 ksi
  • 54, 68 mil: 57 ksi

Coating Thickness

  • 30 mil: G40 hot-dipped galvanized coating
  • 33, 43, 54 mil: G60 hot-dipped galvanized coating
  • 68 mil: G90 hot-dipped galvanized coating

Material Thickness

  • 30 mil
  • 33 mil
  • 43 mil
  • 54 mil
  • 68 mil

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 Mx
(lb*ft)		 Vy
(lb)		 Pmax
(lb)		 #10 Screw
(lb)		 # Of Screw
Required for Pmax
Mil Gauge Fy (ksi)
400NS050-*-S??-33 33 20 33 257 976 308 177 2
400NS050-*-S??-43 43 18 33 379 1739 455 263 2
400NS050-*-S??-54 54 16 50 495 3372 594 500 2
400NS050-*-S??-68 68 14 50 593 4871 712 500 2
600NS050-*-S??-33 33 20 33 406 638 487 177 3
600NS050-*-S??-43 43 18 33 557 1415 668 263 3
600NS050-*-S??-54 54 16 50 767 2822 920 500 2
600NS050-*-S??-68 68 14 50 901 5350 1081 500 3
800NS050-*-S??-33 33 20 33 540 474 474 177 3
800NS050-*-S??-43 43 18 33 752 1051 902 263 4
800NS050-*-S??-54 54 16 50 1008 2091 1210 500 3
800NS050-*-S??-68 68 14 50 1228 4220 1474 500 3
400NS100-*-S??-33 33 20 33 486 976 583 177 4
400NS100-*-S??-43 43 18 33 641 1739 769 263 3
400NS100-*-S??-54 54 16 50 1146 3372 1375 500 3
400NS100-*-S??-68 68 14 50 1432 4871 1718 500 4
600NS100-*-S??-33 33 20 33 683 638 638 177 4
600NS100-*-S??-43 43 18 33 939 1415 1127 263 5
600NS100-*-S??-54 54 16 50 1705 2822 2046 500 5
600NS100-*-S??-68 68 14 50 2183 5350 2620 500 6
800NS100-*-S??-331 33 20 33 944 474 474 177 3
800NS100-*-S??-43 43 18 33 1318 1051 1051 263 4
800NS100-*-S??-54 54 16 50 2375 2091 2091 500 5
800NS100-*-S??-68 68 14 50 3118 4220 3742 500 8

Table Notes

  1. Web-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 based on 2004 AISI.