Part Design Guidelines

Hi-Stress and Universal Pierce Nuts

Pierce Nuts are precision made, work hardened, high quality threaded fasteners that can be installed in sheet metal stampings by the same presses and the same dies used to form the part. Available in both strip and bulk form, Pierce Nuts pierce their own hole through a sheet metal panel, offering substantial savings in time and materials over other fasteners. Pierce Nuts are also available with non-threaded holes, ideal for thread forming screws.

When A Forming Operation Follows a Pierce Nut Operation

Do not form part closer than width of nut (W) when nut is installed as shown in "A", right. By rotating nut 90°, as shown in "B", distance "D" may be reduced to approximately 7mm (1/4 in.). Tooling alterations are necessary to reduce "D" below 7mm (1/4 in.); consult your representative.

Radial Position of Pierce Nuts

When designing a part, the readial position of the Pierce Nut should be made optional whenever possible, to facilitate nut flow into die.

Application in Special Materials

For HSLA, stainless steel, aluminum, or plastic material, consult your representative.

Direction of Assembled Load

Assembled load must be against shoulders of nut.

Simulpiercing Two Sheets of Metal

Total panel thickness is not to exceed 90% of recommended thickness for Pierce Nut metal range. For other panel materials, consult your representative.

Sealing Applications

Liquid-tight seals can be attained by use of a special die button. Consult your representative.

Nut Edge to Panel Edge Distance

T (Metal Range)	D (MIN)
T (Metal Range)	MM	IN

1.5 mm or less 0.60 in	3.0	0.12

1.6mm or more 0.61 in	2 x T	2 x T

Emboss Requirements - Universal Pierce Nuts

When clamping two surfaces under load, the nut pilot must be recessed 0.25-0.38mm (.010-.015 in.) from flush surface of panel, according tot he following formula.

"F" Dimension (Pilot Height)	"F"
Minus "T" (Metal Thickness)	"T"
Plus 0.38 mm	+ 0.38 mm (0.15 in.)

Equals Emboss Depth	"X"

Hi-Stress Nuts require no emboss.

Nut to Flange Distances (With Standard Installation Tooling).

Note: Closer nut-to-flange distances may be achieved using altered standard and/or special tooling. Consult your representative.

*Flat surface up to 69.6 mm (2.75 in.). If dimension exceeds 69.6 mm (2.75 in.) for Multipierce and Multimatic Heads, consult your representative.

^†See "Nose Plate Chart" on page 5 for dimensions.

Minimum Nut Spacing (With Standard Installation Tooling).

Close spacing may be achieved using altered standard and/or special tooling. Consult your representative.

Multipierce		Multimatic
A	B	A	B
57.2 mm	2N^†	76.2mm	2N^†

2.25 in.		3.00 in.

^†See Nose Plate Chart on page 5 for dimensions

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