Filter by
System of Measurement
Thread Size
Threaded Insert Type
For Tap Thread Size
Material
Military Specification
For Use In
End Type
Key-Locking Insert Wall Type
Performance
Thread Type
Certification
DFARS Specialty Metals
For Tap Type
Export Control Classification Number (ECCN)
Tensile Strength
Thread Direction
About Threaded Inserts
Choose the right threaded insert for your application and learn how to install it securely.
Key-Locking Threaded Inserts for Soft Metal
![]() |
Inserts | Installation Tools | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | Specs. Met | Each | Each | ||||
Standard Wall | ||||||||||||
High-Strength Cadmium-Plated Alloy Steel | ||||||||||||
| 10-32 | 3/8"-16 | 0.313" | Q | 0.332" | 2 | MS51831A201, NAS1395-3 | 95101A104 | 000000 | ——— | 0 | ||
| 1/4"-28 | 7/16"-14 | 0.375" | X | 0.397" | 2 | MS51831A202, NAS1395-4 | 95101A114 | 00000 | ——— | 0 | ||
| 5/16"-24 | 1/2"-13 | 0.438" | 29/64" | 0.453" | 4 | MS51831A203 | 95101A126 | 00000 | ——— | 0 | ||
| 3/8"-24 | 9/16"-12 | 0.500" | 33/64" | 0.516" | 4 | MS51831A204 | 95101A127 | 00000 | ——— | 0 | ||
| 7/16"-20 | 5/8"-11 | 0.625" | 37/64" | 0.578" | 4 | MS51831A205, NAS1395-7 | 95101A129 | 0000 | ——— | 0 | ||
| 1/2"-20 | 11/16"-11 | 0.688" | 41/64" | 0.641" | 4 | MS51831A206, NAS1395-8 | 95101A132 | 00000 | ——— | 0 | ||
| 9/16"-18 | 13/16"-16 | 0.813" | 49/64" | 0.766" | 4 | MS51831A207, NAS1395-9 | 95101A133 | 00000 | ——— | 0 | ||
| 5/8"-18 | 7/8"-14 | 0.875" | 53/64" | 0.828" | 4 | MS51831A208 | 95101A135 | 00000 | ——— | 0 | ||
| 3/4"-16 | 1 1/8"-12 | 1.125" | 1 1/16" | 1.062" | 4 | MS51831A209 | 95101A137 | 00000 | ——— | 0 | ||
18-8 Stainless Steel | ||||||||||||
| 10-32 | 3/8"-16 | 0.313" | Q | 0.336" | 2 | MS51831-201, NAS1395C3 | 93904A512 | 0000 | ——— | 0 | ||
| 1/4"-28 | 7/16"-14 | 0.375" | X | 0.401" | 2 | MS51831-202, NAS1395C4 | 93904A522 | 0000 | ——— | 0 | ||
| 5/16"-24 | 1/2"-13 | 0.438" | 29/64" | 0.457" | 4 | MS51831-203, NAS1395C5 | 93904A532 | 0000 | ——— | 0 | ||
| 3/8"-24 | 9/16"-12 | 0.500" | 33/64" | 0.521" | 4 | MS51831-204, NAS1395C6 | 93904A542 | 0000 | ——— | 0 | ||
| 7/16"-20 | 5/8"-11 | 0.625" | 37/64" | 0.583" | 4 | MS51831-205, NAS1395C7 | 93904A229 | 0000 | ——— | 0 | ||
| 1/2"-20 | 11/16"-11 | 0.688" | 41/64" | 0.646" | 4 | MS51831-206, NAS1395C8 | 93904A232 | 00000 | ——— | 0 | ||
| 9/16"-18 | 13/16"-16 | 0.813" | 49/64" | 0.771" | 4 | MS51831-207, NAS1395C9 | 93904A236 | 00000 | ——— | 0 | ||
| 5/8"-18 | 7/8"-14 | 0.875" | 53/64" | 0.833" | 4 | MS51831-208, NAS1395C10 | 93904A241 | 00000 | ——— | 0 | ||
| 3/4"-16 | 1 1/8"-12 | 1.125" | 1 1/16" | 1.067" | 4 | MS51831-209 | 93904A245 | 00000 | ——— | 0 | ||
| 7/8"-14 | 1 1/4"-12 | 1.250" | 1 3/16" | 1.192" | 4 | MS51831-210 | 93904A249 | 00000 | ——— | 0 | ||
| 1"-12 | 1 3/8"-12 | 1.375" | 1 5/16" | 1.317" | 4 | MS51831-211 | 93904A254 | 00000 | 93904A753 | 0000000 | ||
High-Strength High-Temperature A286 Stainless Steel | ||||||||||||
| 10-32 | 3/8"-16 | 0.313" | Q | 0.332" | 2 | MS51831CA201 | 93509A250 | 00000 | ——— | 0 | ||
| 1/4"-28 | 7/16"-14 | 0.375" | X | 0.397" | 2 | MS51831CA202 | 93509A270 | 00000 | ——— | 0 | ||
| 5/16"-24 | 1/2"-13 | 0.438" | 29/64" | 0.453" | 4 | MS51831CA203 | 93509A280 | 00000 | ——— | 0 | ||
| 3/8"-24 | 9/16"-12 | 0.500" | 33/64" | 0.516" | 4 | MS51831CA204 | 93509A310 | 00000 | ——— | 0 | ||
| 5/8"-18 | 7/8"-14 | 0.875" | 53/64" | 0.828" | 4 | MS51831CA208 | 93509A320 | 00000 | ——— | 0 | ||
Thin Wall | ||||||||||||
High-Strength Cadmium-Plated Alloy Steel | ||||||||||||
| 10-32 | 5/16"-18 | 0.313" | I | 0.272" | 2 | MS51830A201, NAS1394-3 | 95101A111 | 0000 | ——— | 0 | ||
| 1/4"-28 | 3/8"-16 | 0.375" | Q | 0.332" | 2 | MS51830A202, NAS1394-4 | 95101A113 | 0000 | ——— | 0 | ||
| 5/16"-24 | 7/16"-14 | 0.438" | X | 0.397" | 4 | MS51830A203, NAS1394-5 | 95101A116 | 0000 | ——— | 0 | ||
| 3/8"-24 | 1/2"-13 | 0.500" | 29/64" | 0.453" | 4 | MS51830A204, NAS1394-6 | 95101A118 | 0000 | ——— | 0 | ||
| 7/16"-20 | 9/16"-12 | 0.563" | 33/64" | 0.516" | 4 | MS51830A205, NAS1394-7 | 95101A121 | 00000 | ——— | 0 | ||
| 1/2"-20 | 5/8"-11 | 0.625" | 37/64" | 0.578" | 4 | MS51830A206, NAS1394-8 | 95101A123 | 0000 | ——— | 0 | ||
18-8 Stainless Steel | ||||||||||||
| 4-40 | 12-24 | 0.250" | 14 Ga. | 0.183" | 2 | NAS1395C04 | 93904A211 | 0000 | 93904A256 | 00000 | ||
| 10-32 | 5/16"-18 | 0.313" | I | 0.276" | 2 | MS51830-201, NAS1394C3 | 93904A612 | 0000 | ——— | 0 | ||
| 1/4"-28 | 3/8"-16 | 0.375" | Q | 0.336" | 2 | MS51830-202, NAS1394C4 | 93904A622 | 0000 | ——— | 0 | ||
| 5/16"-24 | 7/16"-14 | 0.438" | X | 0.401" | 4 | MS51830-203, NAS1394C5 | 93904A214 | 0000 | ——— | 0 | ||
| 3/8"-24 | 1/2"-13 | 0.500" | 29/64" | 0.457" | 4 | MS51830-204, NAS1394C6 | 93904A215 | 0000 | ——— | 0 | ||
| 7/16"-20 | 9/16"-12 | 0.563" | 33/64" | 0.521" | 4 | MS51830-205, NAS1394C7 | 93904A216 | 0000 | ——— | 0 | ||
| 1/2"-20 | 5/8"-11 | 0.625" | 37/64" | 0.583" | 4 | MS51830-206, NAS1394C8 | 93904A217 | 0000 | ——— | 0 | ||
High-Strength High-Temperature A286 Stainless Steel | ||||||||||||
| 1/4"-28 | 3/8"-16 | 0.375" | Q | 0.332" | 2 | MS51830CA202 | 93509A170 | 00000 | ——— | 0 | ||
| 5/16"-24 | 7/16"-14 | 0.438" | X | 0.397" | 4 | MS51830CA203 | 93509A180 | 00000 | ——— | 0 | ||
| 3/8"-24 | 1/2"-13 | 0.500" | 29/64" | 0.453" | 4 | MS51830CA204 | 93509A210 | 00000 | ——— | 0 | ||
| 1/2"-20 | 5/8"-11 | 0.625" | 37/64" | 0.578" | 4 | MS51830CA206 | 93509A230 | 00000 | ——— | 0 | ||
Extra-Thick Wall | ||||||||||||
18-8 Stainless Steel | ||||||||||||
| 10-32 | 7/16"-14 | 0.313" | X | 0.401" | 2 | MS51832-201 | 93904A219 | 00000 | 93904A756 | 00000 | ||
| 1/4"-28 | 1/2"-13 | 0.375" | 29/64" | 0.457" | 4 | MS51832-202 | 93904A221 | 00000 | ——— | 0 | ||
| 5/16"-24 | 9/16"-12 | 0.438" | 33/64" | 0.521" | 4 | MS51832-203 | 93904A223 | 00000 | ——— | 0 | ||
| 3/8"-24 | 5/8"-11 | 0.500" | 37/64" | 0.583" | 4 | MS51832-204 | 93904A225 | 00000 | 93904A267 | 00000 | ||
| 1/2"-20 | 13/16"-16 | 0.688" | 49/64" | 0.771" | 4 | MS51832-206 | 93904A233 | 00000 | 93904A277 | 00000 | ||
| 9/16"-18 | 7/8"-14 | 0.813" | 53/64" | 0.833" | 4 | MS51832-207 | 93904A237 | 00000 | ——— | 0 | ||
| 5/8"-18 | 1"-12 | 0.875" | 15/16" | 0.942" | 4 | MS51832-208 | 93904A242 | 00000 | 93904A286 | 00000 | ||
Screw-Locking Seize-Resistant Key-Locking Threaded Inserts for Soft Metal
![]() |
Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | Specs. Met | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|
Standard Wall | ||||||||||
Dry-Film-Lubricated Cadmium-Plated Steel | ||||||||||
| 10-32 | 3/8"-16 | 0.313" | Q | 0.332" | 2 | MS51831A201L, NAS1395-3L | 97255A247 | 000000 | ||
| 5/16"-24 | 1/2"-13 | 0.438" | 29/64" | 0.453" | 4 | MS51831A203L | 97255A251 | 00000 | ||
| 3/8"-24 | 9/16"-12 | 0.500" | 33/64" | 0.516" | 4 | MS51831A204L | 97255A253 | 00000 | ||
| 7/16"-20 | 5/8"-11 | 0.625" | 37/64" | 0.578" | 4 | MS51831A205L | 97255A255 | 00000 | ||
| 1/2"-20 | 11/16"-11 | 0.688" | 41/64" | 0.641" | 4 | MS51831A206L | 97255A257 | 00000 | ||
Dry-Film-Lubricated 18-8 Stainless Steel | ||||||||||
| 10-32 | 3/8"-16 | 0.313" | Q | 0.332" | 2 | NAS1395C3L | 97255A132 | 0000 | ||
| 1/4"-28 | 7/16"-14 | 0.375" | X | 0.397" | 2 | NAS1395C4L | 97255A134 | 0000 | ||
| 5/16"-24 | 1/2"-13 | 0.438" | 29/64" | 0.453" | 4 | NAS1395C5L | 97255A136 | 0000 | ||
| 3/8"-24 | 9/16"-12 | 0.500" | 33/64" | 0.516" | 4 | NAS1395C6L | 97255A138 | 0000 | ||
| 1/2"-20 | 11/16"-11 | 0.688" | 41/64" | 0.641" | 4 | NAS1395C8L | 97255A143 | 00000 | ||
| 7/8"-14 | 1 1/4"-12 | 1.375" | 1 3/16" | 1.188" | 4 | MS51831-210L | 97255A152 | 00000 | ||
Thin Wall | ||||||||||
Dry-Film-Lubricated Cadmium-Plated Steel | ||||||||||
| 10-32 | 5/16"-18 | 0.313" | I | 0.272" | 2 | MS51830A201L, NAS1394-3L | 97255A232 | 0000 | ||
| 1/4"-28 | 3/8"-16 | 0.375" | Q | 0.332" | 2 | MS51830A202L, NAS1394-4L | 97255A234 | 0000 | ||
| 1/4"-28 | 7/16"-14 | 0.375" | X | 0.397" | 2 | MS51831A202L, NAS1395-4L | 97255A235 | 00000 | ||
| 3/8"-24 | 1/2"-13 | 0.500" | 29/64" | 0.453" | 4 | MS51830A204L, NAS1394-6L | 97255A239 | 0000 | ||
| 1/2"-20 | 5/8"-11 | 0.625" | 37/64" | 0.578" | 4 | MS51830A206L, NAS1394-8L | 97255A244 | 00000 | ||
Dry-Film-Lubricated 18-8 Stainless Steel | ||||||||||
| 10-32 | 5/16"-18 | 0.313" | I | 0.272" | 2 | MS51830-201L, NAS1394C3L | 97255A117 | 0000 | ||
| 1/4"-28 | 3/8"-16 | 0.375" | Q | 0.332" | 2 | MS51830-202L, NAS1394C4L | 97255A119 | 0000 | ||
| 5/16"-24 | 7/16"-14 | 0.438" | X | 0.397" | 4 | MS51830-203L, NAS1394C5L | 97255A122 | 0000 | ||
| 3/8"-24 | 1/2"-13 | 0.500" | 29/64" | 0.453" | 4 | MS51830-204L, NAS1394C6L | 97255A124 | 0000 | ||
| 7/16"-20 | 9/16"-12 | 0.563" | 33/64" | 0.516" | 4 | MS51830-205L, NAS1394C7L | 97255A126 | 00000 | ||
| 1/2"-20 | 5/8"-11 | 0.625" | 37/64" | 0.578" | 4 | MS51830-206L, NAS1394C8L | 97255A128 | 00000 | ||
Mil. Spec. Rivet-Mount Nuts
Base | Barrel | Mounting | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Lg. | Wd. | Thk. | Dia. | Ht. | No. of Holes | Hole Dia. | Hole Ctr.-to-Ctr. | Mil. Spec. | Certificate Type | Each | |||
Steel—Unlubricated | ||||||||||||||
| 10-32 | 47/64" | 13/32" | 3/32" | 0.234" | 5/32" | 2 | 0.098" | 1/2" | MS21075-3N | — | 90857A129 | 00000 | ||
| 1/4"-28 | 51/64" | 1/2" | 3/32" | 0.313" | 3/16" | 2 | 0.098" | 9/16" | MS21075-4N | — | 90857A130 | 0000 | ||
Carbon Steel—Unlubricated | ||||||||||||||
| 10-32 | 61/64" | 13/32" | 1/32" | 0.234" | 7/32" | 2 | 0.098" | 11/16" | MS21059-3 | Material Certificate | 90857A103 | 0000 | ||
| 1/4"-28 | 1 19/64" | 33/64" | 1/32" | 0.313" | 1/4" | 2 | 0.098" | 1" | MS21059-4 | — | 90857A104 | 0000 | ||
Cadmium-Plated Carbon Steel—Lubricated | ||||||||||||||
| 10-32 | 61/64" | 13/32" | 1/32" | 0.234" | 7/32" | 2 | 0.098" | 11/16" | MS21059L3 | — | 90857A109 | 0000 | ||
| 1/4"-28 | 1 19/64" | 33/64" | 1/32" | 0.313" | 1/4" | 2 | 0.098" | 1" | MS21059L4 | — | 90857A110 | 0000 | ||
| 5/16"-24 | 1 19/64" | 39/64" | 3/64" | 3/8" | 9/32" | 2 | 0.13" | 1" | MS21059L5 | Material Certificate | 90857A111 | 0000 | ||
| 3/8"-24 | 1 19/64" | 43/64" | 1/16" | 0.453" | 19/64" | 2 | 0.13" | 1" | MS21059L6 | Material Certificate | 90857A112 | 00000 | ||
Cadmium-Plated Steel—Lubricated | ||||||||||||||
| 10-32 | 47/64" | 13/32" | 3/32" | 0.234" | 5/32" | 2 | 0.098" | 1/2" | MS21075L3N | — | 90857A134 | 0000 | ||
| 1/4"-28 | 51/64" | 1/2" | 3/32" | 0.313" | 3/16" | 2 | 0.098" | 9/16" | MS21075L4N | — | 90857A135 | 0000 | ||
A286 Stainless Steel—Lubricated | ||||||||||||||
| 10-32 | 47/64" | 13/32" | 3/32" | 0.234" | 5/32" | 2 | 0.098" | 1/2" | MS21076L3N | Material Certificate | 90857A144 | 0000 | ||
| 10-32 | 61/64" | 13/32" | 1/32" | 0.234" | 7/32" | 2 | 0.098" | 11/16" | MS21060L3 | Material Certificate | 90857A122 | 0000 | ||
| 1/4"-28 | 51/64" | 1/2" | 3/32" | 0.313" | 3/16" | 2 | 0.098" | 9/16" | MS21076L4N | — | 90857A145 | 00000 | ||
| 1/4"-28 | 1 19/64" | 33/64" | 1/32" | 0.313" | 1/4" | 2 | 0.098" | 1" | MS21060L4 | — | 90857A123 | 00000 | ||
| 5/16"-24 | 1 1/64" | 37/64" | 7/64" | 0.391" | 7/32" | 2 | 0.13" | 23/32" | MS21076L5N | — | 90857A146 | 00000 | ||
| 5/16"-24 | 1 19/64" | 39/64" | 3/64" | 3/8" | 9/32" | 2 | 0.13" | 1" | MS21060L5 | Material Certificate | 90857A124 | 00000 | ||
| 3/8"-24 | 1 19/64" | 43/64" | 1/16" | 0.453" | 19/64" | 2 | 0.13" | 1" | MS21060L6 | Material Certificate | 90857A125 | 00000 | ||
Silver-Plated A286 Stainless Steel—Unlubricated | ||||||||||||||
| 10-32 | 47/64" | 13/32" | 3/32" | 0.234" | 5/32" | 2 | 0.098" | 1/2" | MS21076-3N | — | 90857A138 | 0000 | ||
| 10-32 | 61/64" | 13/32" | 1/32" | 0.234" | 7/32" | 2 | 0.098" | 11/16" | MS21060-3 | — | 90857A116 | 0000 | ||
| 1/4"-28 | 51/64" | 1/2" | 3/32" | 0.313" | 3/16" | 2 | 0.098" | 9/16" | MS21076-4N | Material Certificate | 90857A139 | 00000 | ||
| 1/4"-28 | 1 19/64" | 33/64" | 1/32" | 0.313" | 1/4" | 2 | 0.098" | 1" | MS21060-4 | — | 90857A117 | 00000 | ||
| 5/16"-24 | 1 1/64" | 37/64" | 7/64" | 0.391" | 7/32" | 2 | 0.13" | 23/32" | MS21076-5N | Material Certificate | 90857A140 | 00000 | ||































