Techtran Electronics (India) Pvt. Ltd.

Park Street, Kolkata, West Bengal

PEM broaching fasteners can be utilized with all types of PC boards, as well as with aluminum, acrylic, and polycarbonate components. They install simply, quickly, and permanently for secure and reliable attachment. Their use eliminates the need for washers, lock washers, nuts, and other excess hardware.

The PEM family of broaching fasteners includes broaching nuts (Types KF2 and KFS2) with permanent threads for board mounting or component attachment; threaded or unthreaded standoffs (Types KFE and KFSE) for stacking or spacing and flare mounted standoffs (Type KFB3) for greater pullout performance; threaded studs (Type KFH) for use as solderable connectors or as permanently mounted mechanical fasteners with external threads; all-metal standoffs (Type KSSB) featuring a spring action to hold a PC board securely without screws or threaded hardware; self-expanding FOILGARD fasteners (Type KPS6) used in plated thru-holes in multi-layer PC Boards; and one-piece board-mount screw assemblies (Type PFK) with captive screws for easy mounting and removal of PC boards.

The unique PEMFLEXself-locking feature with EF or MD finishes, meet the locking torque requirements for 250F nuts of NASM25027 specification. The self-clinching feature is the same tried and proven design preferred and appreciated for fast, simple assembly. These fasteners do not protrude through the reverse side of the sheet and provide positive, permanent attachment with high torque-out (many times greater than locking torque) and pushout resistances.

PEM all-metal, self-locking fasteners are available in steel, stainless steel, and aluminum. Types LK (steel) and LKS (stainless) are treated with a black dry film lubricant for better locking performance. Type LKA (aluminum) must be used with a lubricated screw. The PEM design utilizes two rugged, semicircular flexing jaws instead of several less-supported segments. The greater ruggedness and retention of this PEMFLEX action prevents relaxation and loosening of the fastener in severe service.

The PEM SpotFast' self clinching fastener from Pennfngineering' allows pivoting of two sheets of metal. A wave washer provides the consistent torsion to allow repeatable hinging. The fastener installs smooth with the top sheet, and flush or sub-flush with the bottom sheet. Squeezing the fastener into place causes a cold-flow of panel material into the fastener's two separate clinch profiles. This fastener is capable of joining two dissimilar metals, including unequal thicknesses.

• Alternative to riveting
• Washer allows pivoting with consistent force
• Standard parts install into sheets as thin as .031"/0.8mm
• Flush mounted
• Minimal space requirements
• Can be installed blind into bottom (Panel 2) panel
• Can join dissimilar metals
• RoHS compliant

• Punch or drill properly sized mounting hole in both panels. Do not perform any secondary operations such as deburring
• Using only Panel 1, with the punch and anvil surfaces parallel, apply squeezing force until the fastener is flush with the top of Panel 1
• Place washer over installed fastener (concave side facing up), then place Panel 2 over fastener. Apply squeezing force. Keep .015-.020" / 0.38-0.51 mm nominal gap between two sheets after installation

• Clinch feature mounts fastener permanently into metal sheet
• Unique barrel design allows for quick "panel-on-panel" attachment and detachment
• Head is flush or sub-flush with one side of metal sheet. Can be clinched into blind hole where concealed-head is required
• Makes horizontal or vertical component mounting possible

The PEM KEYHOLES sheet joining fastener. Type SKC-P", is designed so that two sheets can be quickly joined flat against each other and then can be removed from the assembly by simply sliding the sheet sideways and lifting it off.

Typically, several KEYHOLE'S sheet joining fasteners are used with one standard PEW threaded Type F flush nut which accepts a screw to secure the sheets against any unwanted movement

• Punch or drill properly sized mounting hole in Panel
• Place the fastener into anvil hole as shown in the drawing to the right
• Place the panel over the shank of the fastener
• With the punch and anvil surfaces parallel, apply only enough squeezing force until flange is flush with panel

• Mill a blind hole to .043"/ 1.1mm deep
• Place the fastener into anvil hole as shown in the drawing to the right
• Place the panel over the shank of the fastener
• With the punch and anvil surfaces parallel, apply only enough squeezing force until flange is flush with panel

These fasteners provide toad-bearing threads in thin sheets as hard as Rockwell B 88 / HS 183 and permit up to .030" / 0.76 mm adjustment for mating hole misalignment.

The self-clinching feature offers fast and simple assembly. The fasteners are squeezed into properly sized holes using any standard press. The sheet remains flush on one side, and the fastener is permanently locked in place. Uniformity of locking torque for Type LA4 is equivalent to NASM25027 specifications.

• Prepare properly sized mounting hole in sheet. Do not perform any secondary operations such as deburring
• Place fastener into the anvil hole and place the mounting hole over the shank of the fastener.
• With the punch and anvil surfaces parallel, apply sufficient squeezing force until flange contacts mounting sheet

• Speeds assembly by compensating for mating hole misalignment.
• Permanent installation into stainless steel sheets as thin as .038" 10.97 mm and greater.
• Provides high torque-out and pushout resistance in stainless panels.
• RoHS compliant

The PEMa SpotFast fastener from PennEngineering" creates a permanent, flush joining of metal to PCB/plastic

• Alternative to riveting and adhesives
• Standard parts install into metal sheets as thin as .031 "/0.8mm

• Provides barrier to protect threads against foreign matter

• Protects circuits from intrusion of extra long screws

PEM blind fasteners employ the proved PEM self-clinching design and are easily installed in drilled or punched holes. Shanks of PEM fasteners act as their own pilots. PEM blind fasteners can be installed with any standard press applying squeezing forces between parallel surfaces. Installation is inexpensive and requires no previous skills or experience.

PEM self-clinching blind fasteners are available in thread sizes from #4-40 through 1/4-20 / M3 through M6 in carbon or stainless steel. PEM blind fasteners in each thread size are available in two different shank lengths to meet the specifications of design engineers who want panel holes refilled as much as possible.

These fasteners are ideal for applications where a thin sheet requires load-bearing threads but still must remain smooth, with no protrusions on either surface. The PEM flush nut can be installed easily by squeezing it into a round, punched or drilled hole in metal sheets. When the fastener is installed, both the top and the bottom of the sheet remain smooth, enhancing the functional and cosmetic qualities of the entire assembly. PEMSERT self-clinching flush nuts can be installed in metal sheets before bending and forming. This can provide strong threads in places which would be inaccessible for installation after chassis are formed.

PEM flush fasteners are strong too. The hexagonal head along with
the proven PEM self-clinching design ensures high axial and torsional strength and PEMSERT Type F fasteners meet US NASM45938/4 specifications.*

Types FE, FEO and UL are self-locking. Types FE and FEO meet locking torque requirements of NASM25027 for 250F nuts. Type UL self-locking nuts meet locking torque requirements specified herein. Some sizes of FE, FEO, and UL can be ordered to NASM45938/7 specifications.* Types FEX, FEOX and U have free-running class 2B/6H threads.

PEM miniature fasteners provide immediate visual indication when proper installation has been accomplished.

A strong, knurled collar, which is completely embedded in the sheet, guarantees against rotation of the fastener in the sheet. The spin resistance of the knurl greatly exceeds the torque that can be exerted by the self-locking feature. When this collar is embedded in the sheet, the undercut cavity beneath the collar is filled with displaced sheet material thereby developing pushout resistance.

A dry-film lubricant applied to these fasteners provides the smooth, non-galling prevailing torque performance necessary for reliable locking and for reusability. In accordance with NASM25027 specifications, screws for use with PEM self-locking fasteners should be Class 3A/4h fit or no smaller than Class 2A/6g. Screws should be long enough so that at least two threads project through the PEM fasteners when tightened.

• bent edge tabs
• bent center tabs
• bent flanges
• angle brackets
• tack welds
• loose hardware

Simply press this fastener into a properly sized rectangular mounting hole. It is held permanently in the sheet or panel using the same high-performance, self-clinching technology that our products have employed since 1942.

Now you can securely attach another sheet or component perpendicular to the sheet in which the WANGLE fastener is installed. For Type RAA, attachment is easily made using thread forming screws resulting in a thread fit which resists vibration and has excellent torque resistance.* Type RAS fasteners are threaded and attachment is simply made using a standard screw. For either type, the holding power of the fastener is unaffected by the repeated removal and reinstallation of the screw.

PEMR'ANGLE fasteners provide many advantages over bent tabs and flanges, including:

• more predictable designs
• material savings
• tighter design control
• improved shielding characteristics
• redution of losse hardware
• fewer assembly steps
• unmarred panel surfaces

One of the very basics of self-clinching is that the fastener must be harder than the host sheet. Only then will the fastener perform as intended. This is particularly challenging whet installing fasteners into stainless steel sheets.

Therefore we have developed this line of specially hardenedstainless steel fasteners. When pressed in they become an integral part of the sheet. They allow the use of stainless steel sheet to satisfy applications, which require lighter, stronger designs that must perform in challenging environments. Effectively eliminate welding and reduce loose hardware.

PEM self-clinching nuts provide strong load-bearing threads in stainless sheets as thin as .030"/0.8mm. When properly installed the nuts mount permanently in the sheets with one side completely flush within the panel. PEM type SP nuts also provide significant corrosion resistant properties for the most demanding conditions.

PEM self-clinching flush-head studs can be mounted in stainless sheets as thin as .040"/1 mm. These studs offer convenient attachment points and achieve excellent performance values. Type FHP studs have high corrosion resistance. You can select either the FH4 or FHP types depending on the level of corrosion resistance that you require.

PEM self-clinching standoffs provide a permanently mounted fastener that can be used for mounting, stacking or spacing components to or from stainless steel panels. Pressed into stainless sheets as thin as .040"/1.02mm these fasteners are available as Type S04 (blind) or Type BSO4 (through hole) types.

PEM self-clinching panel fasteners provide "tool only" access to your stainless steel assemblies.

Fasteners made from precipitation hardened grade stainless are particularly useful in applications such as outdoor equipment, medical devices and chemical and food processing equipment or anywhere corrosive element exposure is possible.

PEMReelFastsurface mount nuts, spacers, panel fasteners and R'ANGLEfasteners are mounted to printed circuit boards in the same manner as other surface mount components prior to the solder reflow process. The fasteners are provided on tape and reel compatible with existing SMT automated installation equipment. Nuts and spacers are available in threaded and unthreaded sizes.

• Faster assembly
• Reduced scrap
• Reduced handling
• Reduced risk of board damage that may occur when fasteners are improperlyinstalled with off-line equipment
• Reduced loose hardware

• MACHINE SCREWS-needs a pre-tapped hole - most commonly used
• TAPPING SCREWS -needs the hole to be drilled pierced, but not tapped - typical types are taptite screws (used on soft metal or casting), plastite screws (used for plastic) or High-Low screws (normally used on sheet metal). - need to specify the type of point for leading the screw into the hole e.g. type BT, type C or F
• DRILLING SCREWS -do not need a hole (but for positional accuracy, a pilot point is recommended) - typically used in construction industries - drilling screws consists of a drill bit tip followed by a tapping screw body. - eliminates the need to bring work piece to the drill bench to prepare hole.

A SEM is an assembly consisting of a screw with one or more washers.

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