PEMPEM Fastener Catalogue
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AC–440–1

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

ALA Floating Self-Clinching Fasteners · Unified · thread .112-40 (#4-40)

Non-locking, 300 series stainless, Passivated and/or tested per ASTM A380.

Also written as AC-440-1.

Part number breakdown

SegmentCodeMeaning
TypeANon-locking
Retainer Material CodeC300 series stainless
Thread440Thread size .112-40 (#4-40)
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.112-40 (#4-40)
Type – Non-Locking (Fastener Material) › 300 Series StainlessAC
Thread Code440
Shank Code1
A (Shank) Max..038
Min. Sheet Thickness.038
Hole Size in Sheet +.003 −.000.290
C Max..289
D Max..290
E ±.015.360
T1 Max..130
T2 Max..190
Min. Dist. Hole ℄ To Edge.30

Material and finish

PropertyValue
TypeAC
Fastener MaterialsThreads › Non-locking › Internal, ASME B1.1, 2B / ASME B1.13M, 6H; Retainer › 300 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 70 / HB 125 or Less

Source: Material and Finish Specifications · PDF page 13

Performance data

PropertyValue
Thread Code440
Shank Code1
Test Sheet Material › 5052-H34 Aluminum › Installation (lbs.)1500
Test Sheet Material › 5052-H34 Aluminum › Retainer Pushout (lbs.)215
Test Sheet Material › 5052-H34 Aluminum › Retainer Torque-out (in. lbs.)65
Test Sheet Material › Cold-Rolled Steel › Installation (lbs.)3000
Test Sheet Material › Cold-Rolled Steel › Retainer Pushout (lbs.)300
Test Sheet Material › Cold-Rolled Steel › Retainer Torque-out (in. lbs.)85

Source: AC/AS/LAC/LAS Nuts · PDF page 14

Installation tooling

PropertyValue
Thread Code440/M3
Counterbore A › ±.001 (in.).054
Counterbore A › ±0.03 (mm)1.37
Hole Depth Below Counterbore B › ±.005 (in.).258
Hole Depth Below Counterbore B › ±0.13 (mm)6.55
Anvil Part Number8013889
Punch Part Number975200048

Source: PEMSERTER® Installation Tooling – AC/AS/LAC/LAS/A4/LA4 Nuts · PDF page 14

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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Part number breakdownDimensionsMaterial and finishPerformance dataInstallation toolingRelated drawingsSource