Mounting Fixings – Mouser United Kingdom

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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 (GBP) 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
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3-2 SI 1: £0.196 188,808In Stock 12,674On Order	Mfr. Part No. IUB-M3-2 Mouser Part No 153-IUB-M3-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	188,808In Stock 12,674On Order	£0.196 £0.134 £0.107 £0.10 View £0.085 £0.082 £0.079 £0.078	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-0420 SI 1: £0.908 3,764In Stock	Mfr. Part No. IUTC-0420 Mouser Part No 153-IUTC-0420	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	3,764In Stock	£0.908 £0.674 £0.531 £0.45 View £0.435 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.316 in	0.5 in	0.342 in	1/4-20
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M3-343 SI 1: £0.608 8,586In Stock	Mfr. Part No. IUTC-M3-343 Mouser Part No 153-IUTC-M3-343	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8,586In Stock	£0.608 £0.432 £0.346 £0.326 View £0.276 £0.265 £0.259 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	3.43 mm	4.55 mm	M3
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-832 SI 1: £0.278 13,090In Stock	Mfr. Part No. IUTB-832 Mouser Part No 153-IUTB-832	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	13,090In Stock	£0.278 £0.196 £0.156 £0.148 View £0.125 £0.12 £0.116 £0.113	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.223 in	0.321 in	0.243 in	8-32
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-632-2 SI 1: £0.496 6,883In Stock	Mfr. Part No. IUC-632-2 Mouser Part No 153-IUC-632-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	6,883In Stock	£0.496 £0.348 £0.279 £0.251 View £0.233 £0.227 £0.213 £0.209 £0.202	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.185 in	0.25 in	0.219 in	6-32
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M3 SI 1: £0.278 60,441In Stock	Mfr. Part No. IUTB-M3 Mouser Part No 153-IUTB-M3	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	60,441In Stock	£0.278 £0.197 £0.158 £0.142 View £0.132 £0.128 £0.12 £0.119 £0.114	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M4 SI 1: £0.796 6,535In Stock 10,000Expected 02/11/2026	Mfr. Part No. IUTC-M4 Mouser Part No 153-IUTC-M4	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	6,535In Stock 10,000Expected 02/11/2026	£0.796 £0.595 £0.464 £0.437 View £0.427 £0.413 £0.399 £0.384 £0.379	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Fixings HI-TORQUE INSERT, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M3-343 SI 1: £0.308 15,214In Stock	Mfr. Part No. IUTB-M3-343 Mouser Part No 153-IUTB-M3-343	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	15,214In Stock	£0.308 £0.218 £0.175 £0.157 View £0.146 £0.142 £0.134 £0.131 £0.126	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	3.43 mm		M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M2.5-1 SI 1: £0.526 10,254In Stock	Mfr. Part No. IUC-M2.5-1 Mouser Part No 153-IUC-M2.5-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10,254In Stock	£0.526 £0.369 £0.296 £0.266 View £0.247 £0.24 £0.226 £0.222 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.89 mm	3.43 mm	4.37 mm	M2.5
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M6 SI 1: £0.995 9,083In Stock	Mfr. Part No. IUTC-M6 Mouser Part No 153-IUTC-M6	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,083In Stock	£0.995 £0.734 £0.572 £0.539 View £0.526 £0.509 £0.491 £0.474 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	8.03 mm	12.7 mm	8.69 mm	M6
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M5 SI 1: £0.705 9,769In Stock	Mfr. Part No. IUTFB-M5 Mouser Part No 153-IUTFB-M5	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,769In Stock	£0.705 £0.497 £0.398 £0.359 View £0.333 £0.323 £0.305 £0.298 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	9.53 mm	7.92 mm	M5
Mounting Fixings ULTRASONIC,INSERT,STAINLESS IUCC-M5-2 SI 1: £0.751 9,496In Stock	Mfr. Part No. IUCC-M5-2 Mouser Part No 153-IUCC-M5-2	SI	Mounting Fixings ULTRASONIC,INSERT,STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,496In Stock	£0.751 £0.558 £0.435 £0.409 View £0.40 £0.387 £0.373 £0.36 £0.354	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	7.06 mm	11.1 mm	8.33 mm	M5
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M2-318 SI 1: £0.405 10,451In Stock	Mfr. Part No. IUTC-M2-318 Mouser Part No 153-IUTC-M2-318	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10,451In Stock	£0.405 £0.286 £0.229 £0.206 View £0.19 £0.185 £0.175 £0.171 £0.165	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.23 mm	3.18 mm	3.73 mm	M2
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M5-2 SI 1: £0.48 9,560In Stock	Mfr. Part No. IUB-M5-2 Mouser Part No 153-IUB-M5-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,560In Stock	£0.48 £0.34 £0.272 £0.245 View £0.228 £0.221 £0.208 £0.203 £0.196	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.25 mm	9.53 mm	7.54 mm	M5
Mounting Fixings HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M2-318 SI 1: £0.353 11,055In Stock	Mfr. Part No. IUTB-M2-318 Mouser Part No 153-IUTB-M2-318	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	11,055In Stock	£0.353 £0.25 £0.201 £0.18 View £0.163 £0.162 £0.153 £0.149 £0.144	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	3.18 mm		M2
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M2.5 SI 1: £0.646 10,828In Stock	Mfr. Part No. IUTC-M2.5 Mouser Part No 153-IUTC-M2.5	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10,828In Stock	£0.646 £0.458 £0.368 £0.33 View £0.306 £0.298 £0.281 £0.274 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	5.74 mm	4.55 mm	M2.5
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M3-1 SI 1: £0.361 9,642In Stock	Mfr. Part No. IUC-M3-1 Mouser Part No 153-IUC-M3-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,642In Stock	£0.361 £0.258 £0.207 £0.185 View £0.173 £0.168 £0.158 £0.155 £0.149	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.89 mm	3.43 mm	4.37 mm	M3
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3-1 SI 1: £0.165 24,894In Stock 25,000Expected 12/02/2027	Mfr. Part No. IUB-M3-1 Mouser Part No 153-IUB-M3-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	24,894In Stock 25,000Expected 12/02/2027	£0.165 £0.12 £0.095 £0.086 View £0.079 £0.078 £0.073 £0.072 £0.069	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.89 mm	3.43 mm	4.37 mm	M3
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M2 SI 1: £0.346 15,912In Stock	Mfr. Part No. IUTB-M2 Mouser Part No 153-IUTB-M2	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	15,912In Stock	£0.346 £0.25 £0.20 £0.18 View £0.167 £0.162 £0.153 £0.149 £0.144	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	4 mm	3.73 mm	M2
Mounting Fixings HI-TORQUE INSERT, BRASS 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M4-470 SI 1: £0.368 9,898In Stock	Mfr. Part No. IUTB-M4-470 Mouser Part No 153-IUTB-M4-470	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,898In Stock	£0.368 £0.257 £0.206 £0.194 View £0.163 £0.157 £0.153 £0.148	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.67 mm	4.7 mm		M4
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M6-2 SI 1: £1.07 9,362In Stock	Mfr. Part No. IUC-M6-2 Mouser Part No 153-IUC-M6-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,362In Stock	£1.07 £0.796 £0.616 £0.581 View £0.567 £0.549 £0.53 £0.512 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	8.15 mm	12.7 mm	9.52 mm	M6
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M3 SI 1: £0.638 37,097In Stock	Mfr. Part No. IUTC-M3 Mouser Part No 153-IUTC-M3	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	37,097In Stock	£0.638 £0.455 £0.364 £0.328 View £0.304 £0.296 £0.279 £0.273 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M4-470 SI 1: £0.826 3,711In Stock 10,000Expected 17/11/2026	Mfr. Part No. IUTC-M4-470 Mouser Part No 153-IUTC-M4-470	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	3,711In Stock 10,000Expected 17/11/2026	£0.826 £0.621 £0.484 £0.456 View £0.446 £0.431 £0.416 £0.401 £0.395	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.67 mm	4.7 mm	6.17 mm	M4
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M5 SI 1: £0.698 6,901In Stock	Mfr. Part No. IUTC-M5 Mouser Part No 153-IUTC-M5	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	6,901In Stock	£0.698 £0.522 £0.406 £0.383 View £0.375 £0.362 £0.349 £0.337 £0.332	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	6.43 mm	9.52 mm	6.93 mm	M5
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M3-2 SI 1: £0.39 10,472In Stock 98,141On Order	Mfr. Part No. IUC-M3-2 Mouser Part No 153-IUC-M3-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10,472In Stock 98,141On Order On Order Ship Dates Mfr. No: IUC-M3-2 Stock: 10,472 Can Dispatch Immediately On Order: 36,141 Pending 62,000 Expected 20/11/2026 Factory Lead Time: 19 Weeks	£0.39 £0.278 £0.223 £0.201 View £0.186 £0.181 £0.17 £0.167 £0.162	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.58 mm	5.56 mm	4.37 mm	M3