SI® inserts by PennEngineering® are typically specified in applications where strong, durable metal threads are required in plastic material, especially where frequent assembly and disassembly of the unit for service or repair is necessary.

• Applications for SI® products include electronics (including wearables, smart phones and hand held devices), automotive, aerospace and defense, medical, transportation, industrial and recreational equipment.
• SI® inserts are available in brass, stainless steel and aluminum.
• SI® inserts are available in a large variety of ultrasonic / heat staking, molded-in or press-in types.
• Aluminum and stainless-steel inserts for plastics offer lead-free alternatives to leaded brass typically used for brass inserts.

– Lead-free inserts offer alternative to leaded brass to address environmental and end-of-life recycling concerns.

– Aluminum inserts are approximately 70% lighter than brass equivalents and made from lead-free aluminum.

– Stainless steel inserts are typically stronger than brass and may offer better protection from certain types of corrosive agents.

• Compression limiters for plastic assemblies.
• SI® microPEM® inserts provide threads as small as M1.

PART NUMBER DESIGNATION AND MATERIAL AND FINISH SPECIFICATIONS

 

ULTRASONIC / HEAT STAKING INSERTS

• Ultrasonic - Installed by pressing the insert into the mounting hole with ultrasonic insertion equipment while simultaneously applying a high frequency vibration. Frictional heat caused by the vibration melts the plastic surrounding the insert allowing easy insertion. When the vibration ceases, the plastic solidifies, locking the insert permanently in place.
• Heat Staking - Installed by pressing the insert into the mounting hole with a thermal press to melt the plastic surrounding the insert.

MOLDED IN INSERTS

• Installed during the molding process, the inserts are located in the mold cavity by core pins. When the mold opens, the core pins are withdrawn leaving the inserts permanently encapsulated in the plastic section with only the threads exposed.
• Installing the inserts during the molding process eliminates the need for secondary steps or installation equipment.

PRESS-IN INSERTS

• Installed by simply pressing the inserts into pre-molded or drilled holes. Installation is accomplished using any standard press at any time during the production process.
• Eliminates the need for molding-in inserts.
• Eliminates the need for heat or ultrasonic equipment.

 

SI® BRAND COMPRESSION LIMITERS

for plastic applications

Compression limiters are non-threaded inserts that are commonly used in applications where a compressive load is applied to a plastic assembly. The compression limiter strengthens the plastic and withstands the compressive force that is applied when a mating screw is tightened in the assembly. The integrity of the plastic is not compromised by the load that is applied.

• Custom designed in a wide range of sizes and profiles
• Available in brass, stainless steel, and lead-free aluminum
• Installed using ultrasonic, heat-staking or molded-in installation methods
• Available design types; flange-head, symmetrical, full diamond knurl and non-knurled symmetrical

 

ULTRASONIC / HEAT STAKING INSERTS

Tapered Thru-Threaded, IUA™, IUB™ and IUC™ Inserts

• Designed for use in tapered holes.
• Tapered mounting hole allows for rapid and accurate alignment prior to installation.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless-steel inserts offer lead-free alternative.

 

ULTRASONIC / HEAT STAKING INSERTS

Straight Wall, Thru-Threaded, IUTA™, IUTB™ and IUTC™ Inserts

• Self-aligning lead-in of insert provides for accurate alignment prior to installation.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless steel inserts offer lead-free alternative.

 

ULTRASONIC / HEAT STAKING INSERTS

Symmetrical, Thru-Threaded, ISA™, ISB™ and ISC™ Inserts

• Symmetrical design eliminates the need for orientation.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless-steel inserts offer lead-free alternative.

 

ULTRASONIC / HEAT STAKING INSERTS

microPEM® Symmetrical, Thru-Threaded, MSIA™ MSIB™ Inserts

• Threads as small as M1.
• Symmetrical design eliminates the need for orientation.
• Provides excellent performance in wide range of plastics.
• Aluminum inserts ideal for light weight designs.
• Aluminum inserts offer lead-free alternative.

 

PERFORMANCE DATA FOR ULTRASONIC / HEAT STAKING INSERTS

 

MOLDED-IN INSERTS

Blind Threaded, IBA™, IBB™ and IBC™ Inserts

• Blind end protects the threads from plastic intrusion.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless-steel inserts offer lead-free alternative.

 

MOLDED-IN INSERTS

Self-Locking, Blind Threaded, IBLC™ Inserts

• Deformed threads create prevailing torque locking feature to prevent screw loosening due to vibration.
• Blind-end protects the threads from plastic intrusion.
• Stainless steel inserts offer lead-free alternative.

 

MOLDED-IN INSERTS

Thru-Threaded, ITA™, ITB™ and ITC™ Inserts

• Pilot diameter and undercuts allow plastic to flow into grooves providing high pullout resistance.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless-steel inserts offer lead-free alternative.

 

MOLDED-IN INSERTS

Thru-Threaded, Knurled, STKA™, STKB™ and STKC™ Inserts

• Uniform knurl diameter reduces the risk of sink marks.
• Available in varying lengths for injection molding assemblies.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless-steel inserts offer lead-free alternative.

 

PERFORMANCE DATA FOR MOLDED-IN INSERTS

 

PRESS-IN INSERTS

Hexagonal, NFPA™ and NFPC™ Inserts

• Press-fit insert provides strong, reusable threads. No heat or ultrasonics required.
• Hexagonal “barbed” configuration ensures high torque-out and pullout values.
• Aluminum inserts ideal for light weight designs.
• Aluminum and stainless steel inserts offer lead-free alternative.

 

PRESS-IN INSERTS

Thru-Threaded, PPA™ and PPB™ Inserts

• Press-fit insert with strong, reusable threads. No heat or ultrasonics required.
• Slotted insert compresses allowing easy access into the mounting hole.
• Aluminum inserts ideal for light weight designs.
• Aluminum inserts offer lead-free alternative.

 

PRESS-IN INSERTS

Flange-Head, PFLA™ and PFLB™ Inserts

• Press-fit insert with strong, reusable threads. No heat or ultrasonics required.
• Flange-head eliminates direct contact of plastic with mating parts.
• Slotted insert compresses allowing easy access into the mounting hole.
• Aluminum inserts ideal for light weight designs.
• Aluminum inserts offer lead-free alternative.

 

PRESS-IN INSERTS

Straight Knurl, PKA™ and PKB™ Inserts

• Press-fit insert with strong, reusable threads. No heat or ultrasonics required.
• Straight knurls at the top end of the insert offers higher torsional resistance.
• Slotted insert compresses allowing easy access into the mounting hole.
• Aluminum inserts ideal for light weight designs.
• Aluminum inserts offer lead-free alternative.

 

 

PERFORMANCE DATA FOR PRESS-IN INSERTS