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    235 Products
    About Threaded Inserts
    industrial info icon

    Choose the right threaded insert for your application and learn how to install it securely.

    Screw-Locking Helical Threaded Inserts

    Image of Product. Pronged. Bottom orientation. Threaded Inserts. Screw-Locking Helical Threaded Inserts, Pronged.

    Pronged

    The irregularly shaped threads tightly grip screws to prevent them from loosening or backing out under vibration. Use these inserts to create or repair threads in pumps and other machinery that shakes and rattles. Also known as Heli-Coil inserts.
    Installation requires a drill bit, a helical insert tap, and an installation tool.
    Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Inserts
    Through-Hole
    Taps
    Closed-End
    Hole Taps
    Installation
    Tools
    Prong
    Break-Off Tools
    Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Each
    Each
    Each
    Each
    Pronged
     
    18-8 Stainless Steel
    2-56
    		0.086"41 Ga.
    		0.096"MS21209C0210, NASM212091090296A0940000091709A09800000091709A40100000090261A14000000092955A1010000000
    2-56
    		0.129"41 Ga.
    		0.096"MS21209C0215, NASM212091090296A095000091709A0980000091709A4010000090261A1400000092955A101000000
    2-56
    		0.172"41 Ga.
    		0.096"MS21209C0220, NASM212091090296A097000091709A0980000091709A4010000090261A1400000092955A101000000
    2-56
    		0.215"41 Ga.
    		0.096"MS21209C0225, NASM21209190296A099000091709A0980000091709A4010000090261A1400000092955A101000000
    3-48
    		0.099"7/64"
    		0.109"MS21209C0310, NASM21209590296A184000091709A0990000091709A4040000090261A15000000092955A101000000
    3-48
    		0.148"7/64"
    		0.109"MS21209C0315, NASM212091090296A098000091709A0990000091709A4040000090261A15000000092955A101000000
    3-56
    		0.099"36 Ga.
    		0.107"MS21209F0310, NASM212091090296A012000091709A0550000091709A4030000090261A10100000092955A101000000
    3-56
    		0.148"36 Ga.
    		0.107"MS21209F0315, NASM21209590296A185000091709A0550000091709A4030000090261A10100000092955A101000000
    4-40
    		0.112"31 Ga.
    		0.120"MS21209C0410, NASM212091090296A101000091709A1010000091709A4070000090261A15100000092955A103000000
    4-40
    		0.168"31 Ga.
    		0.120"MS21209C0415, NASM212091090296A102000091709A1010000091709A4070000090261A15100000092955A103000000
    4-40
    		0.224"31 Ga.
    		0.120"MS21209C0420, NASM21209590296A103000091709A1010000091709A4070000090261A15100000092955A103000000
    4-40
    		0.280"31 Ga.
    		0.120"MS21209C0425, NASM21209590296A104000091709A1010000091709A4070000090261A15100000092955A103000000
    4-40
    		0.336"31 Ga.
    		0.120"MS21209C0430, NASM21209190296A445000091709A1010000091709A4070000090261A15100000092955A103000000
    4-48
    		0.112"31 Ga.
    		0.120"MS21209F0410, NASM212091090296A016000091709A0570000091709A4100000090261A10200000092955A103000000
    4-48
    		0.168"31 Ga.
    		0.120"MS21209F0415, NASM212091090296A018000091709A0570000091709A4100000090261A10200000092955A103000000
    5-40
    		0.125"29 Ga.
    		0.136"MS21209C0510, NASM212091090296A020000091709A0610000091709A4130000090261A10400000092955A103000000
    5-40
    		0.188"29 Ga.
    		0.136"MS21209C0515, NASM212091090296A022000091709A0610000091709A4130000090261A10400000092955A103000000
    5-40
    		0.250"29 Ga.
    		0.136"MS21209C0520, NASM21209590296A023000091709A0610000091709A4130000090261A10400000092955A103000000
    6-32
    		0.138"25 Ga.
    		0.150"MS21209C0610, NASM212091090296A106000091709A1020000091709A4160000090261A15200000092955A10500000
    6-32
    		0.207"25 Ga.
    		0.150"MS21209C0615, NASM212091090296A107000091709A1020000091709A4160000090261A15200000092955A10500000
    6-32
    		0.276"25 Ga.
    		0.150"MS21209C0620, NASM21209590296A108000091709A1020000091709A4160000090261A15200000092955A10500000
    6-32
    		0.345"25 Ga.
    		0.150"MS21209C0625, NASM21209590296A109000091709A1020000091709A4160000090261A15200000092955A10500000
    6-32
    		0.414"25 Ga.
    		0.150"MS21209C0630, NASM21209190296A450000091709A1020000091709A4160000090261A15200000092955A10500000
    6-40
    		0.138"25 Ga.
    		0.150"MS21209F0610, NASM212091090296A024000091709A0630000091709A4190000090261A10600000092955A10500000
    6-40
    		0.207"25 Ga.
    		0.150"MS21209F0615, NASM21209590296A189000091709A0630000091709A4190000090261A10600000092955A10500000
    6-40
    		0.276"25 Ga.
    		0.150"MS21209F0620, NASM21209590296A190000091709A0630000091709A4190000090261A10600000092955A10500000
    8-32
    		0.164"16 Ga.
    		0.177"MS21209C0810, NASM212091090296A111000091709A1030000091709A4220000090261A15300000092955A10700000
    8-32
    		0.246"16 Ga.
    		0.177"MS21209C0815, NASM212091090296A112000091709A1030000091709A4220000090261A15300000092955A10700000
    8-32
    		0.328"16 Ga.
    		0.177"MS21209C0820, NASM212091090296A551000091709A1030000091709A4220000090261A15300000092955A10700000
    8-32
    		0.410"16 Ga.
    		0.177"MS21209C0825, NASM21209190296A552000091709A1030000091709A4220000090261A15300000092955A10700000
    8-32
    		0.492"16 Ga.
    		0.177"MS21209C0830, NASM21209190296A440000091709A1030000091709A4220000090261A15300000092955A10700000
    8-36
    		0.164"16 Ga.
    		0.177"MS21209F0810, NASM212091090296A028000091709A0650000091709A4250000090261A14900000092955A10700000
    8-36
    		0.246"16 Ga.
    		0.177"MS21209F0815, NASM212091090296A030000091709A0650000091709A4250000090261A14900000092955A10700000
    8-36
    		0.328"16 Ga.
    		0.177"MS21209F0820, NASM21209590296A193000091709A0650000091709A4250000090261A14900000092955A10700000
    10-24
    		0.190"5 Ga.
    		0.206"MS21209C1-10, NASM212091090296A116000091709A1040000091709A4280000090261A15400000092955A10900000
    10-24
    		0.285"5 Ga.
    		0.206"MS21209C1-15, NASM212091090296A117000091709A1040000091709A4280000090261A15400000092955A10900000
    10-24
    		0.380"5 Ga.
    		0.206"MS21209C1-20, NASM21209590296A118000091709A1040000091709A4280000090261A15400000092955A10900000
    10-24
    		0.475"5 Ga.
    		0.206"MS21209C1-25, NASM21209190296A119000091709A1040000091709A4280000090261A15400000092955A10900000
    10-32
    		0.285"13/64"
    		0.203"MS21209F1-15, NASM212091090296A202000091709A1510000091709A4310000090261A16100000092955A10900000
    10-32
    		0.380"13/64"
    		0.203"MS21209F1-20, NASM212091090296A554000091709A1510000091709A4310000090261A16100000092955A10900000
    10-32
    		0.475"13/64"
    		0.203"MS21209F1-25, NASM21209190296A105000091709A1510000091709A4310000090261A16100000092955A10900000
    10-32
    		0.570"13/64"
    		0.203"MS21209F1-30, NASM21209190296A555000091709A1510000091709A4310000090261A16100000092955A10900000
    12-24
    		0.216"1 Ga.
    		0.228"MS21209C2-10, NASM212091090296A0320000091709A0670000091709A4340000090261A11000000092955A10900000
    12-24
    		0.324"1 Ga.
    		0.228"MS21209C2-15, NASM212091090296A0340000091709A0670000091709A4340000090261A11000000092955A10900000
    1/4"-20
    		0.250"H
    		0.266"MS21209C4-10, NASM212091090296A121000091709A1050000091709A4370000090261A15500000092955A11100000
    1/4"-20
    		0.375"H
    		0.266"MS21209C4-15, NASM212091090296A122000091709A1050000091709A4370000090261A15500000092955A11100000
    1/4"-20
    		0.500"H
    		0.266"MS21209C4-20, NASM212091090296A557000091709A1050000091709A4370000090261A15500000092955A11100000
    1/4"-20
    		0.625"H
    		0.266"MS21209C4-25, NASM21209190296A558000091709A1050000091709A4370000090261A15500000092955A11100000
    1/4"-20
    		0.750"H
    		0.266"MS21209C4-30, NASM21209190296A559000091709A1050000091709A4370000090261A15500000092955A11100000
    1/4"-28
    		0.250"6.7 mm
    		6.7 mmMS21209F4-10, NASM212091090296A206000091709A1520000091709A4400000090261A16200000092955A11100000
    1/4"-28
    		0.375"6.7 mm
    		6.7 mmMS21209F4-15, NASM212091090296A207000091709A1520000091709A4400000090261A16200000092955A11100000
    1/4"-28
    		0.500"6.7 mm
    		6.7 mmMS21209F4-20, NASM21209590296A208000091709A1520000091709A4400000090261A16200000092955A11100000
    1/4"-28
    		0.625"6.7 mm
    		6.7 mmMS21209F4-25, NASM21209190296A556000091709A1520000091709A4400000090261A16200000092955A11100000
    5/16"-18
    		0.312"Q
    		0.332"MS21209C5-10, NASM212091090296A1260000091709A1060000091709A4430000090261A15600000092955A113000000
    5/16"-18
    		0.469"Q
    		0.332"MS21209C5-15, NASM212091090296A1270000091709A1060000091709A4430000090261A15600000092955A113000000
    5/16"-18
    		0.625"Q
    		0.332"MS21209C5-20, NASM21209190296A128000091709A1060000091709A4430000090261A15600000092955A113000000
    5/16"-24
    		0.312"21/64"
    		0.328"MS21209F5-10, NASM212091090296A211000091709A1530000091709A4460000090261A16300000092955A121000000
    5/16"-24
    		0.469"21/64"
    		0.328"MS21209F5-15, NASM212091090296A212000091709A1530000091709A4460000090261A16300000092955A121000000
    5/16"-24
    		0.625"21/64"
    		0.328"MS21209F5-20, NASM21209190296A213000091709A1530000091709A4460000090261A16300000092955A121000000
    5/16"-24
    		0.781"21/64"
    		0.328"MS21209F5-25, NASM21209190296A214000091709A1530000091709A4460000090261A16300000092955A121000000
    3/8"-16
    		0.375"X
    		0.397"MS21209C6-10, NASM212091090296A1310000091709A1070000091709A4490000090261A15700000092955A115000000
    3/8"-16
    		0.562"X
    		0.397"MS21209C6-15, NASM21209590296A132000091709A1070000091709A4490000090261A15700000092955A115000000
    3/8"-16
    		0.750"X
    		0.397"MS21209C6-20, NASM21209190296A133000091709A1070000091709A4490000090261A15700000092955A115000000
    3/8"-24
    		0.375"25/64"
    		0.391"MS21209F6-10, NASM21209590296A216000091709A1540000091709A4520000090261A16400000092955A123000000
    3/8"-24
    		0.562"25/64"
    		0.391"MS21209F6-15, NASM21209590296A217000091709A1540000091709A4520000090261A16400000092955A123000000
    3/8"-24
    		0.750"25/64"
    		0.391"MS21209F6-20, NASM21209190296A218000091709A1540000091709A4520000090261A16400000092955A123000000
    3/8"-24
    		0.938"25/64"
    		0.391"MS21209F6-25, NASM21209190296A219000091709A1540000091709A4520000090261A16400000092955A123000000
    7/16"-14
    		0.438"29/64"
    		0.453"MS21209C7-10, NASM21209590296A136000091709A1080000091709A4550000090261A15800000092955A202000000
    7/16"-14
    		0.656"29/64"
    		0.453"MS21209C7-15, NASM21209590296A137000091709A1080000091709A4550000090261A15800000092955A202000000
    7/16"-14
    		0.875"29/64"
    		0.453"MS21209C7-20, NASM21209190296A138000091709A1080000091709A4550000090261A15800000092955A202000000
    7/16"-20
    		0.438"29/64"
    		0.453"MS21209F7-10, NASM21209590296A221000091709A1550000091709A4580000090261A16500000092955A203000000
    7/16"-20
    		0.656"29/64"
    		0.453"MS21209F7-15, NASM21209590296A222000091709A1550000091709A4580000090261A16500000092955A203000000
    7/16"-20
    		0.875"29/64"
    		0.453"MS21209F7-20, NASM21209190296A223000091709A1550000091709A4580000090261A16500000092955A203000000
    1/2"-13
    		0.500"17/32"
    		0.531"MS21209C8-10, NASM21209590296A141000091709A1090000091709A4610000090261A15900000092955A119000000
    1/2"-13
    		0.750"17/32"
    		0.531"MS21209C8-15, NASM21209590296A142000091709A1090000091709A4610000090261A15900000092955A119000000
    1/2"-13
    		1"17/32"
    		0.531"MS21209C8-20, NASM21209190296A143000091709A1090000091709A4610000090261A15900000092955A119000000
    1/2"-13
    		1.250"17/32"
    		0.531"MS21209C8-25, NASM21209190296A144000091709A1090000091709A4610000090261A15900000092955A119000000
    1/2"-20
    		0.500"33/64"
    		0.516"MS21209F8-10, NASM21209590296A226000091709A1560000091709A4640000090261A16600000092955A127000000
    1/2"-20
    		0.750"33/64"
    		0.516"MS21209F8-15, NASM21209590296A227000091709A1560000091709A4640000090261A16600000092955A127000000
    1/2"-20
    		1"33/64"
    		0.516"MS21209F8-20, NASM21209190296A228000091709A1560000091709A4640000090261A16600000092955A127000000
    1/2"-20
    		1.250"33/64"
    		0.516"MS21209F8-25, NASM21209190296A229000091709A1560000091709A4640000090261A16600000092955A127000000
    9/16"-12
    		0.562"19/32"
    		0.594"MS21209C9-10, NASM21209190296A140000091709A1110000091709A46700000090261A17100000———0
    9/16"-12
    		0.844"19/32"
    		0.594"MS21209C9-15, NASM21209190296A147000091709A1110000091709A46700000090261A17100000———0
    9/16"-18
    		0.562"37/64"
    		0.578"MS21209F9-10, NASM21209190296A231000091709A1570000091709A47000000090261A112000000———0
    9/16"-18
    		0.844"37/64"
    		0.578"MS21209F9-15, NASM21209190296A232000091709A1570000091709A47000000090261A112000000———0
    5/8"-11
    		0.625"21/32"
    		0.656"MS21209C1010, NASM21209190296A151000091709A1120000091709A47300000090261A17200000———0
    5/8"-11
    		0.938"21/32"
    		0.656"MS21209C1015, NASM21209190296A152000091709A1120000091709A47300000090261A17200000———0
    5/8"-11
    		1.250"21/32"
    		0.656"MS21209C1020, NASM21209190296A153000091709A1120000091709A47300000090261A17200000———0
    5/8"-18
    		0.625"41/64"
    		0.641"MS21209F1010, NASM21209190296A236000091709A1580000091709A47600000090261A182000000———0
    5/8"-18
    		0.938"41/64"
    		0.641"MS21209F1015, NASM21209190296A237000091709A1580000091709A47600000090261A182000000———0
    3/4"-10
    		0.750"25/32"
    		0.781"MS21209C1210, NASM21209190296A156000091709A11300000091709A47900000090261A17300000———0
    3/4"-10
    		1.125"25/32"
    		0.781"MS21209C1215, NASM21209190296A157000091709A11300000091709A47900000090261A17300000———0
    3/4"-10
    		1.500"25/32"
    		0.781"MS21209C1220, NASM21209190296A158000091709A11300000091709A47900000090261A17300000———0
    3/4"-16
    		0.750"49/64"
    		0.766"MS21209F1210, NASM21209190296A241000091709A15900000091709A48200000090261A183000000———0
    3/4"-16
    		1.125"49/64"
    		0.766"MS21209F1215, NASM21209190296A242000091709A15900000091709A48200000090261A183000000———0
    7/8"-9
    		0.875"29/32"
    		0.906"MS21209C1410, NASM21209190296A163000091709A11400000091709A48500000090261A17400000———0
    7/8"-14
    		0.875"57/64"
    		0.891"MS21209F1410, NASM21209190296A2480000091709A16100000091709A48800000090261A114000000———0
    7/8"-14
    		1.312"57/64"
    		0.891"MS21209F1415, NASM21209190296A247000091709A16100000091709A48800000090261A114000000———0
    1"-8
    		1"1 1/32"
    		1.031"MS21209C1610, NASM21209190296A166000091709A11500000091709A49100000090261A17500000———0
    1"-8
    		1.500"1 1/32"
    		1.031"MS21209C1615, NASM21209190296A1670000091709A11500000091709A49100000090261A17500000———0
    1"-12
    		1"1 1/32"
    		1.031"MS21209F1610, NASM21209190296A0400000091709A07300000091709A49700000090261A176000000———0
    1 1/4"-7
    		1.875"1 19/64"
    		1.297"MS21209C2015, NASM21209190296A0500000091709A11700000091709A50600000090261A124000000———0
     

    Screw-Locking Seize-Resistant Helical Threaded Inserts

    Image of Product. Bottom orientation. Threaded Inserts. Screw-Locking Seize-Resistant Helical Threaded Inserts.
    Screws won't get stuck or come loose with these inserts. A dry film on the surface lubricates fasteners during insertion to prevent sticking and binding. Once installed, the irregularly shaped threads tightly grip screws to keep them in place under vibration. Also known as Heli-Coil inserts.
    Installation requires a drill bit, a helical insert tap, and an installation tool.
    Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.
    Dry-Film-Lubricated 18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Inserts
    Through-Hole
    Taps
    Closed-End
    Hole Taps
    Installation
    Tools
    Prong
    Break-Off Tools
    Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Each
    Each
    Each
    Each
    Pronged
     
    Dry-Film-Lubricated 18-8 Stainless Steel
    2-56
    		0.086"41 Ga.
    		0.096"MS21209C0210L, NASM21209591000A4010000091709A09800000091709A40100000090261A14000000092955A1010000000
    2-56
    		0.129"41 Ga.
    		0.096"MS21209C0215L, NASM21209591000A404000091709A0980000091709A4010000090261A1400000092955A101000000
    2-56
    		0.172"41 Ga.
    		0.096"MS21209C0220L, NASM21209591000A407000091709A0980000091709A4010000090261A1400000092955A101000000
    4-40
    		0.112"31 Ga.
    		0.120"MS21209C0410L, NASM21209591000A411000091709A1010000091709A4070000090261A15100000092955A103000000
    4-40
    		0.168"31 Ga.
    		0.120"MS21209C0415L, NASM21209591000A415000091709A1010000091709A4070000090261A15100000092955A103000000
    4-40
    		0.224"31 Ga.
    		0.120"MS21209C0420L, NASM21209591000A419000091709A1010000091709A4070000090261A15100000092955A103000000
    6-32
    		0.138"25 Ga.
    		0.150"MS21209C0610L, NASM21209591000A422000091709A1020000091709A4160000090261A15200000092955A10500000
    6-32
    		0.207"25 Ga.
    		0.150"MS21209C0615L, NASM21209591000A425000091709A1020000091709A4160000090261A15200000092955A10500000
    6-32
    		0.276"25 Ga.
    		0.150"MS21209C0620L, NASM21209591000A429000091709A1020000091709A4160000090261A15200000092955A10500000
    10-24
    		0.285"5 Ga.
    		0.206"MS21209C1-15L, NASM21209591000A436000091709A1040000091709A4280000090261A15400000092955A10900000
    10-32
    		0.190"13/64"
    		0.203"MS21209F1-10L, NASM21209591000A463000091709A1510000091709A4310000090261A16100000092955A10900000
    10-32
    		0.285"13/64"
    		0.203"MS21209F1-15L, NASM21209591000A466000091709A1510000091709A4310000090261A16100000092955A10900000
    10-32
    		0.380"13/64"
    		0.203"MS21209F1-20L, NASM21209591000A469000091709A1510000091709A4310000090261A16100000092955A10900000
    1/4"-20
    		0.375"H
    		0.266"MS21209C4-15L, NASM21209591000A443000091709A1050000091709A4370000090261A15500000092955A11100000
    1/4"-20
    		0.500"H
    		0.266"MS21209C4-20L, NASM21209191000A446000091709A1050000091709A4370000090261A15500000092955A11100000
    5/16"-18
    		0.469"Q
    		0.332"MS21209C5-15L, NASM21209191000A454000091709A1060000091709A4430000090261A15600000092955A113000000
    5/16"-18
    		0.625"Q
    		0.332"MS21209C5-20L, NASM21209191000A458000091709A1060000091709A4430000090261A15600000092955A113000000
     
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