PEMPEM Fastener Catalogue
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CSS–0420–5

CSS / CSOS Stainless Steel Concealed-Head Standoffs · Unified · PDF page 22 · PEM Fastener Catalogue

CSS / CSOS Stainless Steel Concealed-Head Standoffs · Unified · thread .250-20 (1/4-20)

Concealed-head standoff (through-threaded styles), 300 series stainless.

Also written as CSS-0420-5.

Part number breakdown

SegmentCodeMeaning
TypeCSConcealed-head standoff (through-threaded styles)
MaterialS300 series stainless
Thread0420Thread size .250-20 (1/4-20)
Length Code "L"5—

Style #1 (1)

Minimum thread length equals barrel length L. Screw might not pass through shank end. Screws with lengths exceeding L should not be used or they may cause jacking-out of the standoff from the sheet.

Dimensions

Defines A, B, C, F, L. This is a technical engineering diagram of a "Style #3" threaded fastener or insert, shown in a half-sectional view. Key dimensional labels include: A: Head thickness/height. B: Outer diameter of the shank. C: Overall head diameter. F: Internal thread depth. L: Total length of the shank from under the head. Internal Detail: Shows a female-threaded internal bore.Defines H. Type: CSS Component: Top view of a mechanical fastener or standoff. Features: Octagonal or fluted outer profile. Concentric circular internal features (likely threaded hole and pilot. Horizontal and vertical centerlines. Dimension: "H" indicates the width across the flats or the total width of the component.Defines A, B, C, F, L. Entity: TYPE CSOS component (self-clinching standoff Key Features: Two Groove: Identifiable external marking (Registered Trademark. Internal Threads: Shown in cross-section view. Dimension Labels: A: Flange/head thickness. B: Outer body diameter. C: Flange/head diameter. F: Internal thread depth. L: Overall body length from under the head.Defines A, B, C, L. This is a technical cross-sectional drawing of a threaded clinch fastener. Key dimensions and features include: A: Thickness of the clinch head. B: Outer diameter of the threaded body. C: Diameter of the clinch profile. L: Length of the body. Internal Threads: The upper half shows a cross-section of the internal threading. Context: Dimensions are in inches; the clinching profile may vary.
DimensionValue
Thread Size.250-20 (1/4-20)
Type › Stainless SteelCSS
Thread Code0420
Length Code "L" +.002 −.005 (Length code is in 16ths of an inch) › .3125 (1)
Min. Sheet Thickness.062
Blind Mounting Hole Dia. +.003 −.000.390
Min. Depth of Blind Hole.043
Min. Depth Full Thread F.375
A (Shank) Max..041
B Max..354
C Max..389
H Nom..438
Min. Dist. Hole ℄ To Edge.375

Material and finish

PropertyValue
TypeCSS
ThreadsInternal, ASME B1.1 2B / ASME B1.13M, 6H
Fastener Materials300 Series Stainless Steel
FinishPassivated and/or tested per ASTM A380
For Use In Sheet HardnessHRB 70 / HB 125 or Less

Source: Material and Finish Specifications · PDF page 23

Installation tooling

PropertyValue
TypeCSS / CSOS
Thread Code0420
D +.003 −.000.358
Punch Part Number975200048
Anvil Part Number970200018300

Source: PEMSERTER® Installation Tooling · PDF page 23

Source

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Part number breakdownDimensionsMaterial and finishInstallation toolingSource