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 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
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, BRASS IUB-832-2 SI 1: £0.248 9,721In Stock	Mfr. Part No. IUB-832-2 Mouser Part No 153-IUB-832-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,721In Stock	£0.248 £0.175 £0.14 £0.126 View £0.114 £0.113 £0.107 £0.105 £0.10	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.208 in	0.312 in	0.25 in	8-32
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-632 SI 1: £0.255 9,510In Stock	Mfr. Part No. IUTB-632 Mouser Part No 153-IUTB-632	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,510In Stock	£0.255 £0.18 £0.143 £0.129 View £0.117 £0.116 £0.11 £0.107 £0.104	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.189 in	0.281 in	0.21 in	6-32
Mounting Fixings ULTRASONIC INSERT, ALUM IUA-M5-1 SI 1: £0.255 81In Stock	Mfr. Part No. IUA-M5-1 Mouser Part No 153-IUA-M5-1	SI	Mounting Fixings ULTRASONIC INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	81In Stock	£0.255 £0.18 £0.144 £0.136 View £0.115 £0.11 £0.107 £0.104	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	6.78 mm	5.72 mm	7.54 mm	M5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-032-2 SI 1: £0.465 744In Stock 10,000Expected 05/02/2027	Mfr. Part No. IUB-032-2 Mouser Part No 153-IUB-032-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	744In Stock 10,000Expected 05/02/2027	£0.465 £0.332 £0.265 £0.238 View £0.223 £0.216 £0.203 £0.199 £0.192	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.246 in	0.375 in	0.297 in	10-32
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUCC-M3-2 SI 1: £0.465 344In Stock	Mfr. Part No. IUCC-M3-2 Mouser Part No 153-IUCC-M3-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	344In Stock	£0.465 £0.33 £0.265 £0.25 View £0.211 £0.202 £0.198 £0.191	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.7 mm	6.35 mm	5.56 mm	M3
Mounting Fixings HI-TORQUE INSERT, ALUM IUTA-256 SI 1: £0.255 253In Stock	Mfr. Part No. IUTA-256 Mouser Part No 153-IUTA-256	SI	Mounting Fixings HI-TORQUE INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	253In Stock	£0.255 £0.185 £0.148 £0.134 View £0.124 £0.12 £0.113 £0.111 £0.107	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.127 in	0.157 in	0.147 in	2-56
Mounting Fixings HI-TORQUE INSERT, ALUM IUTA-440 SI 1: £0.248 559In Stock	Mfr. Part No. IUTA-440 Mouser Part No 153-IUTA-440	SI	Mounting Fixings HI-TORQUE INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	559In Stock	£0.248 £0.176 £0.141 £0.127 View £0.118 £0.115 £0.108 £0.106 £0.102	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.158 in	0.226 in	0.179 in	4-40
Mounting Fixings HI-TORQUE INSERT, ALUMINUM .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTA-440-135 SI 1: £0.248 946In Stock	Mfr. Part No. IUTA-440-135 Mouser Part No 153-IUTA-440-135	SI	Mounting Fixings HI-TORQUE INSERT, ALUMINUM .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	946In Stock	£0.248 £0.176 £0.141 £0.127 View £0.118 £0.115 £0.108 £0.106 £0.102	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.158 in	0.135 in		4-40
Mounting Fixings HI-TORQUE INSERT IUTA-M2.5 SI 1: £0.278 7,249In Stock	Mfr. Part No. IUTA-M2.5 Mouser Part No 153-IUTA-M2.5	SI	Mounting Fixings HI-TORQUE INSERT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7,249In Stock	£0.278 £0.194 £0.155 £0.147 View £0.124 £0.119 £0.115 £0.112	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	4.01 mm	5.74 mm	4.55 mm	M2.5
Mounting Fixings ISB-M4 DBL ENDED NUT ISB-M4 SI 1: £0.511 363In Stock	Mfr. Part No. ISB-M4 Mouser Part No 153-ISB-M4	SI	Mounting Fixings ISB-M4 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	363In Stock	£0.511 £0.368 £0.293 £0.265 View £0.245 £0.238 £0.225 £0.22 Quote	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Brass	5.62 mm	8.15 mm	6.22 mm	M4
Mounting Fixings ULTRASONIC INSERT, ALUM IUA-M5-2 SI 1: £0.271 1,121In Stock	Mfr. Part No. IUA-M5-2 Mouser Part No 153-IUA-M5-2	SI	Mounting Fixings ULTRASONIC INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,121In Stock	£0.271 £0.189 £0.151 £0.142 View £0.12 £0.115 £0.113 £0.109	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	6.25 mm	9.53 mm	7.54 mm	M5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3.5-2 SI 1: £0.217 1,130In Stock	Mfr. Part No. IUB-M3.5-2 Mouser Part No 153-IUB-M3.5-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,130In Stock	£0.217 £0.153 £0.122 £0.115 View £0.098 £0.093 £0.092 £0.088	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.7 mm	6.35 mm	5.56 mm	M3.5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M6-2 SI 1: £0.751 755In Stock	Mfr. Part No. IUB-M6-2 Mouser Part No 153-IUB-M6-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	755In Stock	£0.751 £0.56 £0.462 £0.392 View £0.388 £0.375 £0.362 £0.357	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	8.15 mm	12.7 mm	9.52 mm	M6
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-032-2 SI 1: £0.668 525In Stock	Mfr. Part No. IUC-032-2 Mouser Part No 153-IUC-032-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	525In Stock	£0.668 £0.499 £0.388 £0.367 View £0.359 £0.347 £0.335 £0.323 £0.318	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.246 in	0.375 in	0.297 in	10-32
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-832-1 SI 1: £0.473 9In Stock	Mfr. Part No. IUC-832-1 Mouser Part No 153-IUC-832-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9In Stock	£0.473 £0.336 £0.27 £0.243 View £0.225 £0.219 £0.207 £0.202 £0.196	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.226 in	0.185 in	0.25 in	8-32
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M2.5-2 SI 1: £0.533 1,149In Stock	Mfr. Part No. IUC-M2.5-2 Mouser Part No 153-IUC-M2.5-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,149In Stock	£0.533 £0.378 £0.303 £0.285 View £0.242 £0.232 £0.227 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.58 mm	5.56 mm	4.37 mm	M2.5
Mounting Fixings HI-TORQUE INSERT, BRASS 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M4-470 SI 1: £0.368 6,246In 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	6,246In 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, BRASS IUB-632-1 SI 1: £0.18 98In Stock 10,000On Order	Mfr. Part No. IUB-632-1 Mouser Part No 153-IUB-632-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	98In Stock 10,000On Order	£0.18 £0.125 £0.10 £0.094 View £0.079 £0.076 £0.074 £0.072	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.199 in	0.15 in	0.219 in	6-32
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-024-1 SI 1: £0.646 380In Stock	Mfr. Part No. IUC-024-1 Mouser Part No 153-IUC-024-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	380In Stock	£0.646 £0.48 £0.378 £0.32 View £0.309 £0.305	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.267 in	0.225 in	0.297 in	10-24
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-256-1 SI 1: £0.361 5,924In Stock	Mfr. Part No. IUC-256-1 Mouser Part No 153-IUC-256-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	5,924In Stock	£0.361 £0.255 £0.204 £0.184 View £0.171 £0.166 £0.157 £0.153 £0.148	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.118 in	0.115 in	0.141 in	2-56
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M6 SI 1: £0.608 841In Stock 10,000Expected 08/02/2027	Mfr. Part No. IUTB-M6 Mouser Part No 153-IUTB-M6	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	841In Stock 10,000Expected 08/02/2027	£0.608 £0.432 £0.346 £0.326 View £0.276 £0.265 £0.259 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	8.03 mm	12.7 mm	8.69 mm	M6
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL .150X.183 6-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-632-150 SI 1: £0.615 230In Stock	Mfr. Part No. IUTC-632-150 Mouser Part No 153-IUTC-632-150	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL .150X.183 6-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	230In Stock	£0.615 £0.443 £0.354 £0.319 View £0.296 £0.287 £0.271 £0.265 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.189 in	0.15 in	0.21 in	6-32
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M2.5 SI 1: £0.421 6,506In Stock	Mfr. Part No. IUTFB-M2.5 Mouser Part No 153-IUTFB-M2.5	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	6,506In Stock	£0.421 £0.303 £0.242 £0.217 View £0.202 £0.196 £0.185 £0.182 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	5.54 mm	M2.5	Bulk