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A4–024–1

ALA Floating Self-Clinching Fasteners · Unified · PDF page 13 · PEM Fastener Catalogue

ALA Floating Self-Clinching Fasteners · Unified · thread .190-24 (#10-24)

Non-locking, 400 series stainless, Passivated and/or tested per ASTM A380.

Also written as A4-024-1.

Part number breakdown

SegmentCodeMeaning
TypeANon-locking
Retainer Material Code4400 series stainless
Thread024Thread size .190-24 (#10-24)
Shank1—

Dimensions

Defines A, T1, C, D. This technical drawing is a cross-sectional view of a self-clinching fastener, likely a blind nut. Key Dimensional Parameters: A: Width of the clinching/base section. T1: Overall depth/thickness of the cap portion. C: Diameter of the base/clinching interface. D: Overall external diameter of the body. Key Features: Internal Threading: Centrally located within the body. Blind Design: Features a closed cap to prevent fluid or debris ingress. Clinching Profile: Noted as variable, designed for permanent installation in sheet metal.Defines E. Technical drawing of a circular component cross-section: Dimension E: Represents the outermost diameter. Features: Multiple concentric and eccentric circular elements. Reference: Includes vertical and horizontal centerlines for alignment.Defines float. Technical diagram showing a top-down view of a mechanical component: Central feature: A circular opening housed within a square element. Housing: Outer concentric circles with a serrated or threaded ring detail. Float specification: An orange arrow points to the internal square, corresponding to text indicating a float of .015”/0.38 mm minimum in all directions from the center (.030”/0.76 mm total. Alignment: Horizontal and vertical centerlines intersect at the midpoint of the component.
DimensionValue
Thread Size.190-24 (#10-24)
Type – Non-Locking (Fastener Material) › 400 Series StainlessA4
Thread Code024
Shank Code1
A (Shank) Max..038
Min. Sheet Thickness.038
Hole Size in Sheet +.003 −.000.406
C Max..405
D Max..405
E ±.015.470
T1 Max..170
T2 Max..270
Min. Dist. Hole ℄ To Edge.36

Material and finish

PropertyValue
TypeA4
Fastener MaterialsThreads › Non-locking › Internal, ASME B1.1, 2B / ASME B1.13M, 6H; Retainer › Hardened 400 Series Stainless Steel; Nut › 300 Series Stainless Steel
Standard FinishesNon-locking › Retainer & Nut › Passivated and/or tested per ASTM A380
For Use In Sheet HardnessHRB 88 / HB 183 or Less

Source: Material and Finish Specifications · PDF page 13

Single groove identifies A4/LA4 for stainless sheets. PEM® Double Squares: Registered trademark feature located on the top inner rim of the fastener. PEM® Single groove: Registered trademark feature on the outer side wall; identifies products for installation into stainless steel sheets (A4 and LA4 types. Fastener Type: Circular threaded insert with a knurled base and specialized identifying marks.The image displays four types of circular aerospace fasteners: AC/AS: Standard non-locking fastener. LAC/LAS: Locking fastener with a dark-colored insert. LA4: Locking thread version with a dark insert. A4: Non-locking thread version.

Source

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