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	Packaging
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M3 SI 1: £0.33 6,884In Stock 15,000On Order	Mfr. Part No. IUTFB-M3 Mouser Part No 153-IUTFB-M3	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	6,884In Stock 15,000On Order	£0.33 £0.235 £0.188 £0.177 View £0.15 £0.143 £0.141 £0.136	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	5.54 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-024-2 SI 1: £0.728 9,048In Stock 1,132On Order	Mfr. Part No. IUC-024-2 Mouser Part No 153-IUC-024-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,048In Stock 1,132On Order	£0.728 £0.543 £0.423 £0.399 View £0.388 £0.376 £0.363 £0.35 £0.345	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.246 in	0.375 in	0.297 in	10-24
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUCC-M3-1 SI 1: £0.48 11,866In Stock	Mfr. Part No. IUCC-M3-1 Mouser Part No 153-IUCC-M3-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	11,866In Stock	£0.48 £0.337 £0.271 £0.244 View £0.225 £0.219 £0.207 £0.202 £0.196	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.05 mm	3.81 mm	5.56 mm	M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M8 SI 1: £1.09 10,201In Stock	Mfr. Part No. IUTC-M8 Mouser Part No 153-IUTC-M8	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10,201In Stock	£1.09 £0.811 £0.63 £0.593 View £0.581 £0.56 £0.541 £0.523 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	9.6 mm	12.7 mm	10.31 mm	M8
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-440 SI 1: £0.361 9,989In Stock	Mfr. Part No. IUTFB-440 Mouser Part No 153-IUTFB-440	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,989In Stock	£0.361 £0.253 £0.203 £0.182 View £0.167 £0.164 £0.155 £0.152 £0.147	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.158 in	0.226 in	0.218 in	4-40	Bulk
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M6-2 SI 1: £1.07 9,162In 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	9,162In 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 ULTRASONIC INSERT, BRASS IUB-M2.5-2 SI 1: £0.368 9,056In Stock	Mfr. Part No. IUB-M2.5-2 Mouser Part No 153-IUB-M2.5-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,056In Stock	£0.368 £0.258 £0.207 £0.186 View £0.17 £0.168 £0.158 £0.155 £0.149	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.58 mm	5.56 mm	4.37 mm	M2.5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-440-1 SI 1: £0.165 9,774In 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	9,774In Stock	£0.165 £0.116 £0.093 £0.088 View £0.073 £0.071 £0.069 £0.067	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.153 in	0.135 in	0.172 in	4-40
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-0428-1 SI 1: £0.952 694In Stock	Mfr. Part No. IUC-0428-1 Mouser Part No 153-IUC-0428-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	694In Stock	£0.952 £0.711 £0.554 £0.522 View £0.511 £0.494 £0.477 £0.459 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.349 in	0.3 in	0.375 in	1/4-28
Mounting Fixings HI-TORQUE INSERT, ALUM IUTA-M5 SI 1: £0.361 811In 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	811In Stock	£0.361 £0.255 £0.204 £0.193 View £0.163 £0.156 £0.153 £0.148	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: £0.368 7,224In 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	7,224In Stock	£0.368 £0.26 £0.208 £0.196 View £0.166 £0.159 £0.155 £0.15	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.23 mm	4 mm	3.73 mm	M2
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M6-1 SI 1: £0.796 1,680In Stock	Mfr. Part No. IUC-M6-1 Mouser Part No 153-IUC-M6-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,680In Stock	£0.796 £0.596 £0.464 £0.437 View £0.428 £0.414 £0.40 £0.385 £0.379	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	8.86 mm	7.62 mm	9.52 mm	M6
Mounting Fixings ULTRASONIC INSERT, ALUM IUA-440-1 SI 1: £0.196 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	£0.196 £0.141 £0.113 £0.102 View £0.094 £0.092 £0.086 £0.085 £0.082	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: £0.203 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	£0.203 £0.143 £0.115 £0.108 View £0.092 £0.087 £0.086 £0.083	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.185 in	0.25 in	0.219 in	6-32
Mounting Fixings TAPERED THRU THREADED INSERT M2X0.4 STAINLESS STEEL IUC-M2-1 SI 1: £0.33 1,681In 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	1,681In Stock	£0.33 £0.234 £0.188 £0.169 View £0.157 £0.153 £0.143 £0.141 £0.136	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: £0.285 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	£0.285 £0.20 £0.16 £0.151 View £0.127 £0.122 £0.12 £0.115	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: £0.39 483In 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	483In Stock	£0.39 £0.273 £0.219 £0.207 View £0.175 £0.168 £0.163 £0.158	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: £0.225 5,598In 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	5,598In Stock	£0.225 £0.158 £0.126 £0.119 View £0.10 £0.096 £0.094 £0.091	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.158 in	0.135 in		4-40
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-256-1 SI 1: £0.203 990In Stock	Mfr. Part No. IUB-256-1 Mouser Part No 153-IUB-256-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	990In Stock	£0.203 £0.148 £0.118 £0.106 View £0.099 £0.095 £0.09 £0.088 £0.085	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.118 in	0.115 in	0.141 in	2-56
Mounting Fixings HI-TORQUE INSERT, ALUMINUM 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTA-M5-572 SI 1: £0.383 973In Stock	Mfr. Part No. IUTA-M5-572 Mouser Part No 153-IUTA-M5-572	SI	Mounting Fixings HI-TORQUE INSERT, ALUMINUM 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	973In Stock	£0.383 £0.275 £0.22 £0.198 View £0.184 £0.179 £0.169 £0.165 £0.159	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	6.43 mm	5.72 mm		M5
Mounting Fixings HI-TORQUE INSERT, BRASS .150X.183 6-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-632-150 SI 1: £0.24 8,492In 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	8,492In Stock	£0.24 £0.168 £0.135 £0.127 View £0.107 £0.103 £0.10 £0.097	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.189 in	0.15 in		6-32
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-0420-1 SI 1: £0.413 600In Stock	Mfr. Part No. IUB-0420-1 Mouser Part No 153-IUB-0420-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	600In Stock	£0.413 £0.293 £0.235 £0.212 View £0.196 £0.191 £0.18 £0.176 £0.17	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.349 in	0.3 in	0.375 in	1/4-20
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M5-1 SI 1: £0.323 6,331In Stock	Mfr. Part No. IUB-M5-1 Mouser Part No 153-IUB-M5-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	6,331In Stock	£0.323 £0.233 £0.186 £0.168 View £0.155 £0.151 £0.142 £0.14 £0.134	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.78 mm	5.72 mm	7.54 mm	M5
Mounting Fixings ULTRASONIC INSERT, BRASS IUBB-M5-1 SI 1: £0.323 682In Stock	Mfr. Part No. IUBB-M5-1 Mouser Part No 153-IUBB-M5-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	682In Stock	£0.323 £0.226 £0.181 £0.17 View £0.144 £0.138 £0.135 £0.131	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	7.7 mm	6.71 mm	8.33 mm	M5
Mounting Fixings HI-TORQUE INSERT, BRASS 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M5-572 SI 1: £0.421 311In Stock 10,000Expected 28/10/2026	Mfr. Part No. IUTB-M5-572 Mouser Part No 153-IUTB-M5-572	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	311In Stock 10,000Expected 28/10/2026	£0.421 £0.298 £0.238 £0.215 View £0.20 £0.194 £0.183 £0.179 £0.173	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	5.72 mm		M5