Part # SMTSSS-156-8 ET, SMTSS™ REELFAST® Surface Mount SNAP-TOP® Standoffs

PEM® surface mounted standoffs that eliminate the need for attaching screws

PEM® SMTSS™ fasteners feature a spring action to hold a P.C. Board securely without screw or threaded hardware, allowing for quick assembly.
Mount on P.C. Boards in the same manner and at the same time as other surface mount components prior to the automated reflow solder process.
Alleviated concerns about potential damage to P.C. Boards due to improper secondary installation operations.
Fasteners provided on tape and reel compatible with existing SMT automated installation equipment.
Benefits include reduced scrap, reduced handling and reduced risk of board damage.

Unit of Measure

Specifications

L - Length ± .005¹	N/A .250 in
Min. Sheet Thickness	N/A .060 in
A Max.	N/A .060 in
C Max.	N/A .161 in
E ± .005	N/A .250 in
B ± .005	N/A .188 in
P ± .005	N/A .141 in
øH - Hole Size in Sheet + .003 - .000	N/A .166 in
øD - Min. Solder Pad	N/A .276 in
Parts per Reel²	N/A 280
Fastener Material	N/A Carbon Steel
Standard Finish³	N/A Electro-Plated Tin, ASTM B 545, Class A with Clear Preservative Coating, annealed
Top Mounting Hole A + .003 -.000	N/A .156 in
Bottom Mounting Hole B + .003 -.000	N/A .166 in
Min. Thickness - Panel 1 (Bottom)	N/A .060 in
Thickness Range - Panel 2 (Top)	N/A .040 to .070 in
Material - Panel 1 (Bottom)	N/A PC Board
Material - Panel 2 (Top)	N/A PC Board or Metal
Edge Distance C Min.⁴	N/A .100 in
Location Tolerance	N/A ±.005 in
Max. Hardness - Panel 1 (Bottom)	N/A No Limit
Max. Hardness - Panel 2 (Top)	N/A No Limit
CAD Supplier	N/A PennEngineering® (PEM®)
Inventory	N/A {0}

¹ The “L” dimension is the height of the installed stud at max grip. The height of the stud will increase if it is installed into thinner material. To calculate “actual L” use this formula: max grip - actual grip + L = “actual L”
² Packaged on 330mm recyclable reels. Tape width is 24 mm. Supplied with polyimide patch for vacuum pick up. Reels conform to EIA-481.
³ (1) See PEM Technical Support section of our web site for related plating standards and specifications. (2) Optimal solderability life noted on packaging.
⁴ To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.

Specifications

Min. Sheet Thickness

A Max.

C Max.

E ± .005

B ± .005

P ± .005

øH - Hole Size in Sheet + .003 - .000

øD - Min. Solder Pad

Fastener Material

Top Mounting Hole A + .003 -.000

Bottom Mounting Hole B + .003 -.000

Min. Thickness - Panel 1 (Bottom)

Thickness Range - Panel 2 (Top)

Material - Panel 1 (Bottom)

Material - Panel 2 (Top)

Location Tolerance

Max. Hardness - Panel 1 (Bottom)

Max. Hardness - Panel 2 (Top)

CAD Supplier

Inventory