PEMPEM Fastener Catalogue

S–0428–3ZI

S / SS / CLS / CLSS / SP Self-Clinching Nuts · Unified · PDF page 28 · PEM Fastener Catalogue

S / SS / CLS / CLSS / SP Self-Clinching Nuts · Unified · thread .250-28 (1/4-28)

Carbon steel nut, Zinc plated per ASTM B633, SC1 (5µm), Type III, Colorless.

Also written as S-0428-3ZI.

Part number breakdown

SegmentCodeMeaning
TypeSCarbon steel nut
Thread0428Thread size .250-28 (1/4-28)
Shank3
FinishZIZinc plated per ASTM B633, SC1 (5µm), Type III, Colorless

Dimensions

Defines E, C, A, T. Technical diagram of a clinch nut with two views: Left (Plan View: Top-down view showing a circular nut with a serrated/knurled clinching profile. E: Overall diameter. Right (Section View: Side cross-section showing internal threading and profile. C: Diameter of the clinching feature. A: Depth of the clinching pilot. T: Thickness of the nut body. Note: "(Clinching profile may vary" indicating potential manufacturing differences.
DimensionValue
Thread Size.250-28 (1/4-28)
Type (Fastener Material) › Carbon SteelS
Thread Code0428
Shank Code3
A (Shank) Max..120
Rec. Min. Sheet Thickness.125
Hole Size In Sheet +.003 −.000.344
C Max..343
E ±.010.440
T ±.010.170
Min. Dist. Hole ℄ To Edge.34

Material and finish

PropertyValue
TypeS
ThreadsInternal ASME B1.1 2B/ASME B1.13M, 6H
Fastener MaterialsHardened Carbon Steel
Standard FinishesZinc Plated, per ASTM B633, SC1 (5µm), Type III, Colorless
Optional FinishZinc Plated per ASTM B633, SC1 (5µm), Type II, Yellow
For use in Sheet HardnessHRB 80/ HB 150 or less

Source: Material and Finish Specifications · PDF page 33

Source

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