Mounting Fixings – Mouser Ireland

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Ultrasonic/Heat Staking Inserts

SI (Standard Inserts) Ultrasonic/Heat Staking Inserts are hexagonal-shaped body inserts that provide rotational torque resistance and knurling provides torque out resistance. The heat staking inserts are installed by pressing the insert into the mounting hole with a thermal press to melt the plastic surrounding the insert. The SI^® brand inserts employ press-in and heat/ultrasonic installation methods to provide strong, reusable, and permanent threads in plastic. These SI^® inserts are available in brass, stainless steel, and aluminum. The applications include wearables, smartphones, handheld devices, automotive, aerospace and defense, medical, transportation, industrial, and recreational equipment.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (EUR) Filter the results in the table by unit price based on your quantity.	Qty.	Product	Type	Material	Mounting Hole Size	Length	Outside Diameter	Thread Size	Packaging
Mounting Fixings HI-TORQUE INSERT, BRASS .150X.183 6-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-632-150 SI 1: €0.275 9,310In Stock	Mfr. Part No. IUTB-632-150 Mouser Part No 153-IUTB-632-150	SI	Mounting Fixings HI-TORQUE INSERT, BRASS .150X.183 6-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,310In Stock	€0.275 €0.193 €0.155 €0.145 View €0.123 €0.118 €0.115 €0.111	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.189 in	0.15 in		6-32
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-032-1 SI 1: €0.344 33In Stock 10,000Expected 01/10/2026	Mfr. Part No. IUB-032-1 Mouser Part No 153-IUB-032-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	33In Stock 10,000Expected 01/10/2026	€0.344 €0.249 €0.20 €0.18 View €0.167 €0.162 €0.153 €0.15 €0.144	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.267 in	0.225 in	0.297 in	10-32
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-440-1 SI 1: €0.189 9,994In Stock	Mfr. Part No. IUB-440-1 Mouser Part No 153-IUB-440-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,994In Stock	€0.189 €0.133 €0.107 €0.101 View €0.084 €0.081 €0.079 €0.077	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.153 in	0.135 in	0.172 in	4-40
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M4-1 SI 1: €0.241 3,861In Stock 10,000Expected 30/10/2026	Mfr. Part No. IUB-M4-1 Mouser Part No 153-IUB-M4-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	3,861In Stock 10,000Expected 30/10/2026	€0.241 €0.173 €0.138 €0.125 View €0.115 €0.113 €0.106 €0.103 €0.10	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.74 mm	4.7 mm	6.35 mm	M4
Mounting Fixings HI-TORQUE INSERT, ALUM IUTA-M5 SI 1: €0.413 1,211In Stock	Mfr. Part No. IUTA-M5 Mouser Part No 153-IUTA-M5	SI	Mounting Fixings HI-TORQUE INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,211In Stock	€0.413 €0.292 €0.234 €0.221 View €0.187 €0.179 €0.175 €0.169	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	6.43 mm	9.52 mm	6.93 mm	M5
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M2 SI 1: €0.421 7,339In Stock	Mfr. Part No. IUTC-M2 Mouser Part No 153-IUTC-M2	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7,339In Stock	€0.421 €0.298 €0.238 €0.224 View €0.19 €0.182 €0.178 €0.172	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.23 mm	4 mm	3.73 mm	M2
Mounting Fixings ULTRASONIC INSERT, ALUM IUA-440-1 SI 1: €0.224 1,426In Stock	Mfr. Part No. IUA-440-1 Mouser Part No 153-IUA-440-1	SI	Mounting Fixings ULTRASONIC INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,426In Stock	€0.224 €0.162 €0.13 €0.117 View €0.108 €0.105 €0.099 €0.097 €0.094	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.153 in	0.135 in	0.172 in	4-40
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-632-2 SI 1: €0.232 7,377In Stock	Mfr. Part No. IUB-632-2 Mouser Part No 153-IUB-632-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7,377In Stock	€0.232 €0.164 €0.132 €0.124 View €0.105 €0.10 €0.098 €0.095	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.185 in	0.25 in	0.219 in	6-32
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-440-1 SI 1: €0.413 3,211In Stock	Mfr. Part No. IUC-440-1 Mouser Part No 153-IUC-440-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	3,211In Stock	€0.413 €0.295 €0.237 €0.212 View €0.198 €0.192 €0.181 €0.177 €0.171	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.153 in	0.135 in	0.172 in	4-40
Mounting Fixings TAPERED THRU THREADED INSERT M2X0.4 STAINLESS STEEL IUC-M2-1 SI 1: €0.378 1,891In Stock	Mfr. Part No. IUC-M2-1 Mouser Part No 153-IUC-M2-1	SI	Mounting Fixings TAPERED THRU THREADED INSERT M2X0.4 STAINLESS STEEL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,891In Stock	€0.378 €0.268 €0.215 €0.194 View €0.18 €0.175 €0.164 €0.161 €0.156	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3 mm	2.92 mm		M2
Mounting Fixings HI-TORQUE INSERT, ALUMINUM 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTA-M4-470 SI 1: €0.327 828In Stock	Mfr. Part No. IUTA-M4-470 Mouser Part No 153-IUTA-M4-470	SI	Mounting Fixings HI-TORQUE INSERT, ALUMINUM 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	828In Stock	€0.327 €0.229 €0.183 €0.173 View €0.146 €0.14 €0.137 €0.132	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	5.67 mm	4.7 mm		M4
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-032 SI 1: €0.447 958In Stock	Mfr. Part No. IUTB-032 Mouser Part No 153-IUTB-032	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	958In Stock	€0.447 €0.313 €0.251 €0.237 View €0.20 €0.192 €0.187 €0.181	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.253 in	0.375 in	0.273 in	10-32
Mounting Fixings HI-TORQUE INSERT, BRASS .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-440-135 SI 1: €0.258 8,098In Stock	Mfr. Part No. IUTB-440-135 Mouser Part No 153-IUTB-440-135	SI	Mounting Fixings HI-TORQUE INSERT, BRASS .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8,098In Stock	€0.258 €0.181 €0.144 €0.136 View €0.114 €0.11 €0.108 €0.104	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.158 in	0.135 in		4-40
Mounting Fixings ISC-0420 DBL ENDED NUT ISC-0420 SI 1: €1.20 13,412In Stock	Mfr. Part No. ISC-0420 Mouser Part No 153-ISC-0420	SI	Mounting Fixings ISC-0420 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	13,412In Stock	€1.20 €0.894 €0.695 €0.654 View €0.64 €0.618 €0.597 €0.575 Quote	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Stainless Steel	0.315 in	0.5 in	0.338 in	1/4-20
Mounting Fixings ISC-M4 DBL ENDED NUT ISC-M4 SI 1: €0.86 230In Stock	Mfr. Part No. ISC-M4 Mouser Part No 153-ISC-M4	SI	Mounting Fixings ISC-M4 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	230In Stock	€0.86 €0.643 €0.501 €0.472 View €0.462 €0.446 €0.431 €0.415 €0.409	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Stainless Steel	5.62 mm	8.15 mm	6.22 mm	M4
Mounting Fixings ISC-M5 DBL ENDED NUT ISC-M5 SI 1: €0.937 65In Stock	Mfr. Part No. ISC-M5 Mouser Part No 153-ISC-M5	SI	Mounting Fixings ISC-M5 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	65In Stock	€0.937 €0.701 €0.545 €0.514 View €0.503 €0.486 €0.47 €0.452 €0.446	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Stainless Steel	6.4 mm	9.52 mm	7.01 mm	M5
Mounting Fixings ULTRASONIC INSERT, ALUM IUA-632-1 SI 1: €0.241 392In Stock	Mfr. Part No. IUA-632-1 Mouser Part No 153-IUA-632-1	SI	Mounting Fixings ULTRASONIC INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	392In Stock	€0.241 €0.171 €0.137 €0.123 View €0.114 €0.111 €0.105 €0.102 €0.099	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.199 in	0.15 in	0.219 in	6-32
Mounting Fixings ULTRASONIC INSERT, ALUMINUM IUA-M2.5-2 SI 1: €0.335 885In Stock	Mfr. Part No. IUA-M2.5-2 Mouser Part No 153-IUA-M2.5-2	SI	Mounting Fixings ULTRASONIC INSERT, ALUMINUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	885In Stock	€0.335 €0.235 €0.188 €0.177 View €0.15 €0.144 €0.14 €0.136	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	3.58 mm	5.56 mm	4.37 mm	M2.5
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-0420-1 SI 1: €1.04 114In Stock	Mfr. Part No. IUC-0420-1 Mouser Part No 153-IUC-0420-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	114In Stock	€1.04 €0.782 €0.608 €0.574 View €0.561 €0.542 €0.524 €0.505 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.349 in	0.3 in	0.375 in	1/4-20
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-832-2 SI 1: €0.705 1,265In Stock	Mfr. Part No. IUC-832-2 Mouser Part No 153-IUC-832-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,265In Stock	€0.705 €0.495 €0.396 €0.373 View €0.316 €0.304 €0.297 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.208 in	0.312 in	0.25 in	8-32
Mounting Fixings HI-TORQUE INSERT, ALUMINUM .300X.310 1/4-20 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTA-0420-300 SI 1: €0.533 615In Stock	Mfr. Part No. IUTA-0420-300 Mouser Part No 153-IUTA-0420-300	SI	Mounting Fixings HI-TORQUE INSERT, ALUMINUM .300X.310 1/4-20 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	615In Stock	€0.533 €0.378 €0.304 €0.273 View €0.254 €0.247 €0.232 €0.227 €0.219	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.316 in	0.3 in	0.342 in	1/4-20
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M3.5 SI 1: €0.636 4,655In Stock 5,250Expected 30/10/2026	Mfr. Part No. IUTC-M3.5 Mouser Part No 153-IUTC-M3.5	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	4,655In Stock 5,250Expected 30/10/2026	€0.636 €0.448 €0.359 €0.338 View €0.286 €0.274 €0.268 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.81 mm	7.14 mm	5.33 mm	M3.5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M3.5 SI 1: €0.49 341In Stock	Mfr. Part No. IUTFB-M3.5 Mouser Part No 153-IUTFB-M3.5	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	341In Stock	€0.49 €0.353 €0.282 €0.254 View €0.236 €0.23 €0.216 €0.212 €0.205	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.81 mm	7.14 mm	6.35 mm	M3.5	Bulk
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M2.5-1 SI 1: €0.249 7,661In Stock 28,000Expected 20/11/2026	Mfr. Part No. IUB-M2.5-1 Mouser Part No 153-IUB-M2.5-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7,661In Stock 28,000Expected 20/11/2026	€0.249 €0.182 €0.146 €0.132 View €0.122 €0.119 €0.112 €0.109 €0.106	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.89 mm	3.43 mm	4.37 mm	M2.5
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-256-2 SI 1: €0.611 798In Stock	Mfr. Part No. IUC-256-2 Mouser Part No 153-IUC-256-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	798In Stock	€0.611 €0.437 €0.349 €0.315 View €0.292 €0.284 €0.267 €0.262 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.107 in	0.188 in	0.141 in	2-56