Mounting Fixings – Mouser India

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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 (INR) 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 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M3-343 SI 1: ₹39.17 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	₹39.17 ₹27.80 ₹22.26 ₹19.97 View ₹18.53 ₹18.06 ₹17.01 ₹16.62 ₹16.05	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	3.43 mm		M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M4 SI 1: ₹101.27 7,285In Stock	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	7,285In Stock	₹101.27 ₹75.76 ₹58.95 ₹55.60 View ₹54.36 ₹52.55 ₹50.73 ₹48.92 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3-1 SI 1: ₹21.02 28,138In Stock	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	28,138In Stock	₹21.02 ₹15.19 ₹12.13 ₹10.99 View ₹10.13 ₹9.84 ₹9.36 ₹9.08 ₹8.79	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-832 SI 1: ₹35.35 13,261In 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	13,261In Stock	₹35.35 ₹24.84 ₹19.87 ₹18.73 View ₹15.86 ₹15.19 ₹14.81 ₹14.33	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.223 in	0.321 in	0.243 in	8-32
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-0420 SI 1: ₹115.60 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	₹115.60 ₹85.79 ₹67.55 ₹57.32 View ₹55.32 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: ₹77.39 8,756In 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	8,756In Stock	₹77.39 ₹54.94 ₹44.04 ₹41.46 View ₹35.16 ₹33.63 ₹32.96 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, STAINLESS IUTC-632 SI 1: ₹75.48 8,305In Stock	Mfr. Part No. IUTC-632 Mouser Part No 153-IUTC-632	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8,305In Stock	₹75.48 ₹53.02 ₹42.52 ₹40.03 View ₹33.92 ₹32.48 ₹31.81 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.189 in	0.281 in	0.21 in	6-32
Mounting Fixings HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M2-318 SI 1: ₹44.90 11,575In 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	11,575In Stock	₹44.90 ₹31.81 ₹25.51 ₹23.98 View ₹20.35 ₹19.49 ₹19.01 ₹18.34	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: ₹82.16 10,935In 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	10,935In Stock	₹82.16 ₹58.28 ₹46.72 ₹42.04 View ₹38.98 ₹37.83 ₹35.73 ₹34.87 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-632-2 SI 1: ₹63.06 7,383In 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	7,383In Stock	₹63.06 ₹44.33 ₹35.54 ₹32.01 View ₹29.62 ₹28.85 ₹27.13 ₹26.56 Quote	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: ₹35.35 62,715In 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	62,715In Stock	₹35.35 ₹25.13 ₹20.06 ₹18.06 View ₹16.82 ₹16.34 ₹15.38 ₹15.10 ₹14.52	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M2.5-1 SI 1: ₹66.88 10,444In 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	10,444In Stock	₹66.88 ₹47.01 ₹37.64 ₹33.92 View ₹31.43 ₹30.57 ₹28.76 ₹28.18 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: ₹126.11 9,133In 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	9,133In Stock	₹126.11 ₹93.44 ₹72.80 ₹68.60 View ₹66.97 ₹64.78 ₹62.58 ₹60.29 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: ₹89.81 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	₹89.81 ₹63.25 ₹50.64 ₹45.67 View ₹42.32 ₹41.08 ₹38.79 ₹37.93 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	9.53 mm	7.92 mm	M5
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M2-318 SI 1: ₹51.59 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	₹51.59 ₹36.40 ₹29.14 ₹26.18 View ₹24.27 ₹23.60 ₹22.26 ₹21.78 ₹21.02	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: ₹56.37 9,710In 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	9,710In Stock	₹56.37 ₹39.74 ₹31.81 ₹30.00 View ₹25.41 ₹24.27 ₹23.79 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.25 mm	9.53 mm	7.54 mm	M5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3-2 SI 1: ₹24.84 1,90,792In 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	1,90,792In Stock 12,674On Order	₹24.84 ₹17.01 ₹13.66 ₹12.80 View ₹10.80 ₹10.41 ₹10.13 ₹9.84	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M2.5 SI 1: ₹53.50 7,516In 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	7,516In Stock	₹53.50 ₹38.50 ₹30.76 ₹27.71 View ₹25.70 ₹25.03 ₹23.60 ₹23.12 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	5.54 mm	M2.5	Bulk
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M3 SI 1: ₹42.04 19,690In Stock 19,000Expected 02-10-2026	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	19,690In Stock 19,000Expected 02-10-2026	₹42.04 ₹29.90 ₹23.89 ₹22.55 View ₹19.11 ₹18.25 ₹17.87 ₹17.29	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	5.54 mm	M3
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M4 SI 1: ₹57.32 9,201In Stock 31,000On Order	Mfr. Part No. IUTFB-M4 Mouser Part No 153-IUTFB-M4	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,201In Stock 31,000On Order On Order Ship Dates Mfr. No: IUTFB-M4 Stock: 9,201 Can Dispatch Immediately On Order: 20,000 Expected 12-10-2026 11,000 Expected 04-01-2027 Factory Lead Time: 24 Weeks	₹57.32 ₹40.99 ₹32.77 ₹29.52 View ₹27.42 ₹26.66 ₹25.13 ₹24.55 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.67 mm	8.15 mm	7.14 mm	M4
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M2 SI 1: ₹43.95 16,177In 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	16,177In Stock	₹43.95 ₹31.72 ₹25.41 ₹22.83 View ₹21.21 ₹20.64 ₹19.49 ₹19.01 ₹18.34	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	4 mm	3.73 mm	M2
Mounting Fixings HI-TORQUE INSERT IUTA-M3 SI 1: ₹30.57 14,310In Stock 17,000Expected 21-12-2026	Mfr. Part No. IUTA-M3 Mouser Part No 153-IUTA-M3	SI	Mounting Fixings HI-TORQUE INSERT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	14,310In Stock 17,000Expected 21-12-2026	₹30.57 ₹21.97 ₹17.58 ₹15.86 View ₹14.71 ₹14.33 ₹13.47 ₹13.18 ₹12.71	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	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: ₹105.09 4,256In 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	4,256In Stock 10,000Expected 17-11-2026	₹105.09 ₹79.01 ₹61.53 ₹57.99 View ₹56.75 ₹54.84 ₹52.93 ₹51.02 Quote	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: ₹88.85 7,646In 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	7,646In Stock	₹88.85 ₹66.40 ₹51.69 ₹48.73 View ₹47.67 ₹46.05 ₹44.43 ₹42.90 ₹42.23	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	6.43 mm	9.52 mm	6.93 mm	M5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M2 SI 1: ₹45.86 8,794In Stock 10,000Expected 12-02-2027	Mfr. Part No. IUTFB-M2 Mouser Part No 153-IUTFB-M2	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8,794In Stock 10,000Expected 12-02-2027	₹45.86 ₹32.96 ₹26.37 ₹23.79 View ₹22.07 ₹21.40 ₹20.25 ₹19.78 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	3.99 mm	4.75 mm	M2	Bulk