PEM-CLS-self-clinching-nut(压铆螺母)

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S ELF-CLINCHING N UTS

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PEM SELF-CLINCHING NUTS

®

For load-bearing threads in thin sheets – aluminum, steel, and other ductile materials.

Proved Performance

For over 60 years, PEM brand self-clinching fasteners have satisfied production and fastening requirements wherever load-bearing threads are required in thin metal sections too thin to tap.Quick, convenient assembly using standard toolsInstallation of PEM brand self-clinching nuts is simple, quick, and convenient. Just insert them in punched or drilled holes, then apply a squeezing force to embed the clinching ring completely in the sheet metal.

High pushout & torque-out resistance

The clinching ring locks the displaced metal behind the tapered shank, ensuring high pushout resistance. High torque-out resistance is ensured when the knurled platform is embedded in the sheet metal.

Distortion-free installation

Proper installation forces will not distort or damage the threads in PEM nuts because the recommended shank length is always less than the minimum sheet thickness.

PEM self-clinching fasteners should be installed before painting or coating surfaces. To protect threads during the finishing operation, fasteners can be special ordered and shipped to you with Blu-Coat thread mask pre-applied. To order, simply add the suffix “BC” to the standard part number. Installations in pre-painted panels could result in decreased performance. In aluminum sheets, steel and stainless steel fasteners should be installed after surface finishing such as anodizing.

Reverse side remains flush

All clinching takes place on the fastener side of the sheet. The reverse side remains flush and smooth.

Self-clinching Locknuts

These locknuts (Type SL ) are designed with a unique and economical TRI-DENT® locking feature, which meets demanding locking performance requirements.

Thin Sheet Self-clinching Nuts

These nuts (Type SMPS ) feature a lower profile and can be mounted closer to the edge of a sheet than standard self-clinching nuts.Self-clinching nuts for stainless steel

PEM 300® self-clinching nuts (Type SP ) are especially designed for permanent installation into stainless steel sheets as thin as .030”/ 0.8 mm.

Machined from a specialty stainless steel, these fasteners are then heat-treated to a hardness higher than most 300 Series stainless steels. This feature enables PEM 300 fasteners to be installed into stainless steel sheets, employing the same self-clinching principle which has proved successful over the years in thousands of applications.

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Look for the PEM trademarks

The PEM 300Mark

The marks of quality

Part Number Designation

–

–

MaterialCode

Code

Many PEM self-clinching nuts meet NASM45938/1specifications. Consult our Marketing department for a complete Military Specifications and

National Aerospace Standards guide (Bulletin NASM) or check our website.

©2000 PennEngineering

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STEEL AND STAINLESS STEEL NUTS (Metric) – TYPES S, SS, CLS, and CLSS

EC

A

(Clinching profile may vary)

T

All dimensions are in millimeters.

ALUMINUM SELF-CLINCHING NUTS (Unified) - TYPE CLA

(See drawing at top of page) All dimensions are in inches.

(1) For closer distances consult our Engineering Department.(NS) Not Stocked, available on special order.

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STEEL AND STAINLESS STEEL NUTS (Unified) – TYPES S, SS, CLS, and CLSS

E

C

A

T

(Clinching profile may vary)

(1) For closer distances consult our Engineering Department.(NS) Not Stocked, available on special order.

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ALUMINUM SELF-CLINCHING NUTS (Metric) - TYPE CLA

STEEL, SELF-LOCKING AND NON-LOCKING NUTS - TYPES H, HN, HNL

ECEC

A

1

A

T2

All dimensions are in inches.

All dimensions are in millimeters.

(1) For closer distances consult our Engineering Department.(NS) Not Stocked, available on special order.(NA) Not Available - Use Type S instead.

* During installation, the projections on the heads of Type HNL self-locking nuts may be flattened. This is not detrimental in any way and will not affect self-locking or self-clinching performance.

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PEM 300® SELF-CLINCHING NUTSFOR STAINLESS STEELTYPE SP

E

C

The PEM 300® Identification Mark

A

T

All dimensions are in inches.

All dimensions are in millimeters.

(1) For closer distances consult our Engineering Department.

* Sheets thinner than .060” (1.5mm) may work harden during installation and cause reduced performance.

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TRI-DENT®

SELF-CLINCHING LOCKNUTSTYPE SL

E

C

A

PEM TRI-DENTLocking Feature

T

All dimensions are in millimeters.

All dimensions are in millimeters.

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All dimensions are in millimeters.

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PERFORMANCE DATA(1)

(1) Installation, pushout, and torque-out values reported are averages when all installation specifications and procedures are followed. Variations in mounting hole size, sheet material, and installation procedure will affect this data. Performance testing of this product in your application is recommended. We will be happy to provide samples for this purpose.

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PERFORMANCE DATA (Continued)

(1) 3 cycle locking performance. PEM spec PRS-C90 Max. on / Min. off torque for 1st thru 3rd cycles.

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INSTALLATION

Types S, SL, SMPS, SS, CLS, CLSS, CLA, H, HN, and HNL

1.Punch or drill properly sized mounting hole in sheet. Do not perform any

secondary operations such as deburring.

PUNCH

2.Place fastener into the anvil hole and place the mounting hole over the shank of

the fastener as shown in diagram to the right.

3. With punch and anvil surfaces parallel, apply squeezing force until the head of

the nut comes into contact with the sheet material.

ANVIL

Type SP(1)

PEM Type SP nuts are installed by placing them in punched or drilled holes in the sheet material and squeezing them into place with any standard press. A special punch with a pilot pin to align the nut and a special anvil with a pilot pin to align the sheet and a raised ring is required to create a proper installation. The raised ring acts as a second displacer of the stainless sheet material, thereby ensuring that the annular groove of the nut is filled.

INSTALLATION REQUIREMENTS

1. Sheet hardness must be less than 90 on the Rockwell “B” scale.

2. Hole punch should be kept sharp to minimize work hardening around hole.3. Nuts should be installed in punch side of hole.

4. Nuts should not be installed near bends or other highly cold worked areas where sheet hardness may be greater than 90 on the Rockwell “B” scale.

INSTALLATION PUNCH

A

P

R

R1

RECOMMENDEDINSTALLATION ANVIL

BA1

P1

120

R2

Sharp. No burrs

(1) To meet the published performance data, we recommend using the installation punch and anvil shown. You may use a flat punch and anvil, but reduced performance may result.

(2) We recommend replacing installation anvil when the height of the “P” dimension is reduced to .005” / 0.13mm due to wear. Reductions in performance may occur as the height of the protrusion wears. Variations in hole preparation, installation force, and sheet material type, thickness, and hardness will affect both performance and tooling life.

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MATERIAL & FINISH SPECIFICATIONS

ThreadsStandard Finishes

For Use in Sheet Hardness:

TorqueRequirementsSAE AMS-QQ-P-416,(unified) and Type I,90 orB 633Class 3,16.1MPlus Clearon theon theon the(metric)PEM specType III,Type II,SteelPassivationS SL

SS

CLS CLSS

CLA H

HN HNL SP CI(1) Special order with additional charge.

(2) Part numbers for aluminum nuts have no plating suffix.

(3) Unplated threads are sized to accept a basic go guage after .00025” plating.

Specifications subject to change without notice.

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Printed in U.S.A.CAGE-46384

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