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Thread Size Thread Size | Hide |
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For Tap Thread Size For Tap Thread Size |
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Threaded Insert Type Threaded Insert Type |
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Thread Locking | Key Locking |
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Helical |
For Minimum Material Thickness For MinimumMaterial Thickness |
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Key-Locking Insert Wall Style Key-Locking Insert Wall Style |
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For Maximum Hole Diameter For Maximum Hole Diameter |
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Drill Bit Size Drill Bit Size |
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Thread Direction Thread Direction |
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Right Hand | Left Hand |
For Use In For Use In |
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Thread Spacing Thread Spacing |
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Tensile Strength Tensile Strength |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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About Nuts, Materials, and Finishes
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How to Install Key-Locking Inserts
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How to Install Helical Inserts
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About Helical Insert Length
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Inch-to-Inch Male-Female Hex Thread Adapters


Change thread sizes or types, such as fine to coarse threads, on parts without changing gender. These adapters can also be used as standoffs to position components in assemblies and to create space between parts. They have an external hex, so you can tighten them with a wrench.
Black oxide steel adapters have a finish that matches the aesthetics of your system and won’t chip or rub off. They resist rust better than plain steel in indoor and dry environments. However, they will corrode outdoors. At about a third of the weight of steel adapters, aluminum adapters are the lightest we offer. They resist corrosion in wet environments.
18-8 stainless steel adapters resist corrosion in wet environments but will corrode when exposed to salt water and chemicals. They may be mildly magnetic. 316 stainless steel adapters are for use in wet environments and have the best corrosion resistance. Unlike 18-8 stainless steel adapters, they resist corrosion caused by salt water and chemicals. They may be mildly magnetic.
Adapters that meet ASTM specifications are made from or plated with materials that adhere to specific standards for chemical and physical properties, such as hardness.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Lg. | Gender | Thread Fit | Hex | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | (A) | (B) | (A) | (B) | Size | Lg. | Specifications Met | Tensile Strength, psi | Hardness | Each | |
Black-Oxide Steel | ||||||||||||||
3/8"-16 | 3/4"-10 | 3/4" | 1" | Male | Female | Class 2A | Class 2B | 1 1/4" | 2 1/4" | ASTM A108 | Not Rated | Rockwell B65 | 000000000 | 000000 |
Aluminum | ||||||||||||||
3/8"-16 | 3/4"-10 | 3/4" | 1" | Male | Female | Class 2A | Class 2B | 1 1/4" | 2 1/4" | ASTM B211 | 45,000 | Rockwell B56 | 000000000 | 00000 |
1/2"-13 | 3/4"-10 | 3/4" | 1" | Male | Female | Class 2A | Class 2B | 1 1/4" | 2 1/4" | ASTM B211 | 45,000 | Rockwell B56 | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||||||||
3/8"-16 | 3/4"-10 | 3/4" | 1" | Male | Female | Class 2A | Class 2B | 1 1/4" | 2 1/4" | ASTM A582 | 85,000 | Rockwell B80 | 000000000 | 00000 |
1/2"-13 | 3/4"-10 | 3/4" | 1" | Male | Female | Class 2A | Class 2B | 1 1/4" | 2 1/4" | ASTM A582 | 85,000 | Rockwell B80 | 000000000 | 00000 |
316 Stainless Steel | ||||||||||||||
3/8"-16 | 3/4"-10 | 3/4" | 1" | Male | Female | Class 2A | Class 2B | 1 1/4" | 2 1/4" | ASTM A276 | 75,000 | Rockwell B83 | 000000000 | 00000 |
1/2"-13 | 3/4"-10 | 3/4" | 1" | Male | Female | Class 2A | Class 2B | 1 1/4" | 2 1/4" | ASTM A276 | 75,000 | Rockwell B83 | 000000000 | 00000 |
Inch-to-Inch Male Hex Thread Adapters


Need to join two female-threaded parts, such as coupling nuts, with dissimilar inch thread sizes? Attach them to these adapters and tighten the exterior hex nut for a secure connection. You can also use these adapters to change the gender of a mating part from female to male, increase or decrease the thread size, or convert the threads from fine to coarse (and vice versa). The smaller adapters act as threaded standoffs, positioning and separating circuit boards and other components in assemblies.
Adapters that meet ASTM specifications are made from or plated with materials that adhere to specific standards for chemical and physical properties, such as hardness.
Choose black-oxide steel adapters to match the aesthetics of your system or for their mild corrosion resistance. The finish won't chip or rub off. They resist rust in indoor and dry environments, but avoid using them in corrosive environments.
18-8 stainless steel adapters resist corrosion caused by water. They're good for wet and damp environments but will corrode when exposed to salt water and other chloride solutions.
316 stainless steel adapters have the best corrosion resistance. They stand up to wet environments, just like 18-8 stainless steel adapters, but unlike 18-8 stainless steel adapters, they resist corrosion caused by salt water and harsh chemicals.
At about a third of the weight of steel adapters, aluminum adapters are the lightest we offer. They resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Lg. | Thread Fit | Hex | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | (A) | (B) | Size | Lg. | Specifications Met | Tensile Strength, psi | Hardness | Each | |
Black-Oxide Steel | ||||||||||||
3/8"-16 | 3/4"-10 | 5/8" | 3/4" | Class 2A | Class 2A | 1 1/8" | 11/16" | ASTM A108 | 78,000 | Rockwell B85 | 000000000 | 000000 |
1/2"-13 | 3/4"-10 | 3/4" | 3/4" | Class 2A | Class 2A | 1 1/8" | 11/16" | ASTM A108 | 78,000 | Rockwell B85 | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||||||
3/8"-16 | 3/4"-10 | 5/8" | 3/4" | Class 2A | Class 2A | 1 1/8" | 11/16" | ASTM A582 | 85,000 | Rockwell B80 | 000000000 | 00000 |
1/2"-13 | 3/4"-10 | 3/4" | 3/4" | Class 2A | Class 2A | 1 1/8" | 11/16" | ASTM A582 | 85,000 | Rockwell B80 | 000000000 | 00000 |
316 Stainless Steel | ||||||||||||
3/8"-16 | 3/4"-10 | 5/8" | 3/4" | Class 2A | Class 2A | 1 1/8" | 11/16" | ASTM A276 | 75,000 | Rockwell B83 | 000000000 | 00000 |
1/2"-13 | 3/4"-10 | 3/4" | 3/4" | Class 2A | Class 2A | 1 1/8" | 11/16" | ASTM A276 | 75,000 | Rockwell B83 | 000000000 | 00000 |
Aluminum | ||||||||||||
3/8"-16 | 3/4"-10 | 5/8" | 3/4" | Class 2A | Class 2A | 1 1/8" | 11/16" | ASTM B211 | 45,000 | Rockwell B56 | 000000000 | 00000 |
1/2"-13 | 3/4"-10 | 3/4" | 3/4" | Class 2A | Class 2A | 1 1/8" | 11/16" | ASTM B211 | 45,000 | Rockwell B56 | 000000000 | 00000 |
Inch-to-Inch Female Hex Thread Adapters


Connect two differently sized male-threaded parts, such as threaded rods, and tighten with a standard wrench. The threads on these adapters have various sizes and spacing, so you can increase or decrease thread size or adapt from coarse to fine threading. You can also use them to change the gender of a connection from male to female. Small adapters can work as threaded standoffs, which position and separate circuit boards and other components in assemblies.
Black-oxide steel adapters have a finish that won’t chip or rub off. They match the aesthetics of many systems and resists rust in indoor and dry environments.
Zinc-plated steel adapters resist corrosion until the plating wears away and are often used in dry environments.
18-8 stainless steel adapters withstand wet environments but will corrode when exposed to salt water and other chloride solutions.
316 stainless steel adapters are ideal in wet environments and will not corrode when exposed to salt water or harsh chemicals.
Aluminum adapters are about one third of the weight of steel adapters and resist corrosion in wet environments.
Adapters that meet ASTM specifications are made from or plated with materials that adhere to standards for chemical and physical properties, such as hardness.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Lg. | Thread Fit | Hex | Each | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | (A) | (B) | Size | Lg. | Specifications Met | Hardness | 1-9 | 10-Up | |
Black-Oxide Steel | ||||||||||||
1/2"-13 | 3/4"-10 | 1/2" | 3/4" | Class 2B | Class 2B | 1" | 2 1/4" | ASTM A108 | Rockwell B65 | 000000000 | 00000 | 00000 |
5/8"-11 | 3/4"-10 | 5/8" | 3/4" | Class 2B | Class 2B | 1" | 2" | ASTM A108 | Rockwell B65 | 000000000 | 0000 | 0000 |
Zinc-Plated Steel | ||||||||||||
1/2"-13 | 3/4"-10 | 1/2" | 41/64" | Class 2B | Class 2B | 1" | 1 1/2" | ASTM A108, ASTM B633 | Rockwell B65 | 000000000 | 0000 | 0000 |
5/8"-11 | 3/4"-10 | 5/8" | 41/64" | Class 2B | Class 2B | 1" | 1 1/2" | ASTM A108, ASTM B633 | Rockwell B65 | 000000000 | 0000 | 0000 |
3/4"-10 | 7/8"-9 | 3/4" | 3/4" | Class 2B | Class 2B | 1 1/4" | 1 3/4" | ASTM A108, ASTM B633 | Rockwell B65 | 000000000 | 0000 | 0000 |
3/4"-10 | 1"-8 | 3/4" | 55/64" | Class 2B | Class 2B | 1 3/8" | 2" | ASTM A108, ASTM B633 | Rockwell B65 | 000000000 | 00000 | 00000 |
3/4"-10 | 1 1/4"-7 | 3/4" | 1 1/16" | Class 2B | Class 2B | 1 5/8" | 3" | ASTM A108, ASTM B633 | Rockwell B65 | 000000000 | 00000 | 00000 |
18-8 Stainless Steel | ||||||||||||
3/8"-16 | 3/4"-10 | 3/8" | 3/4" | Class 2B | Class 2B | 1" | 1 1/2" | ASTM A582 | Rockwell B80 | 000000000 | 0000 | 0000 |
3/8"-24 | 3/4"-10 | 3/8" | 3/4" | Class 2B | Class 2B | 1" | 1 1/2" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
3/8"-32 | 3/4"-10 | 3/8" | 3/4" | Class 2B | Class 2B | 1" | 1 1/2" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
1/2"-13 | 3/4"-10 | 1/2" | 3/4" | Class 2B | Class 2B | 1" | 2 1/4" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
1/2"-20 | 3/4"-10 | 1/2" | 3/4" | Class 2B | Class 2B | 1" | 2 1/4" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
1/2"-28 | 3/4"-10 | 1/2" | 3/4" | Class 2B | Class 2B | 1" | 2 1/4" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
5/8"-11 | 3/4"-10 | 5/8" | 3/4" | Class 2B | Class 2B | 1" | 2" | __ | Rockwell B55 | 000000000 | 00000 | 00000 |
3/4"-10 | 3/4"-16 | 3/4" | 3/4" | Class 2B | Class 2B | 1 1/4" | 2" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
3/4"-10 | 7/8"-9 | 3/4" | 7/8" | Class 2B | Class 2B | 1 1/4" | 2 1/4" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
3/4"-10 | 1"-8 | 3/4" | 1" | Class 2B | Class 2B | 1 3/8" | 2 1/2" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
3/4"-10 | 1 1/4"-7 | 3/4" | 1 1/16" | Class 2B | Class 2B | 1 5/8" | 3" | ASTM A582 | Rockwell B80 | 000000000 | 00000 | 00000 |
316 Stainless Steel | ||||||||||||
3/8"-16 | 3/4"-10 | 3/8" | 3/4" | Class 2B | Class 2B | 1" | 1 1/2" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 0000 |
3/8"-24 | 3/4"-10 | 3/8" | 3/4" | Class 2B | Class 2B | 1" | 1 1/2" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
3/8"-32 | 3/4"-10 | 3/8" | 3/4" | Class 2B | Class 2B | 1" | 1 1/2" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
1/2"-13 | 3/4"-10 | 1/2" | 3/4" | Class 2B | Class 2B | 1" | 2 1/4" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
1/2"-20 | 3/4"-10 | 1/2" | 3/4" | Class 2B | Class 2B | 1" | 2 1/4" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
1/2"-28 | 3/4"-10 | 1/2" | 3/4" | Class 2B | Class 2B | 1" | 2 1/4" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
5/8"-11 | 3/4"-10 | 5/8" | 3/4" | Class 2B | Class 2B | 1" | 2" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
3/4"-10 | 3/4"-16 | 3/4" | 3/4" | Class 2B | Class 2B | 1 1/4" | 2" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
3/4"-10 | 7/8"-9 | 3/4" | 7/8" | Class 2B | Class 2B | 1 1/4" | 2 1/4" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
3/4"-10 | 1"-8 | 3/4" | 1" | Class 2B | Class 2B | 1 3/8" | 2 1/2" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
3/4"-10 | 1 1/4"-7 | 3/4" | 1 1/16" | Class 2B | Class 2B | 1 5/8" | 3" | ASTM A276 | Rockwell B83 | 000000000 | 00000 | 00000 |
Aluminum | ||||||||||||
3/8"-16 | 3/4"-10 | 3/8" | 3/4" | Class 2B | Class 2B | 1" | 1 1/2" | ASTM B211 | Rockwell B56 | 000000000 | 0000 | 0000 |
3/8"-24 | 3/4"-10 | 3/8" | 3/4" | Class 2B | Class 2B | 1" | 1 1/2" | ASTM B211 | Rockwell B56 | 000000000 | 0000 | 0000 |
1/2"-13 | 3/4"-10 | 1/2" | 3/4" | Class 2B | Class 2B | 1" | 2 1/4" | ASTM B211 | Rockwell B56 | 000000000 | 0000 | 0000 |
1/2"-20 | 3/4"-10 | 1/2" | 3/4" | Class 2B | Class 2B | 1" | 2 1/4" | ASTM B211 | Rockwell B56 | 000000000 | 0000 | 0000 |
1/2"-28 | 3/4"-10 | 1/2" | 3/4" | Class 2B | Class 2B | 1" | 2 1/4" | ASTM B211 | Rockwell B56 | 000000000 | 0000 | 0000 |
5/8"-11 | 3/4"-10 | 5/8" | 3/4" | Class 2B | Class 2B | 1" | 2" | ASTM B211 | Rockwell B56 | 000000000 | 0000 | 0000 |
3/4"-10 | 3/4"-16 | 3/4" | 3/4" | Class 2B | Class 2B | 1 1/4" | 2" | ASTM B211 | Rockwell B56 | 000000000 | 00000 | 00000 |
18-8 Stainless Steel Easy-to-Install Thread-Locking Inserts
Made of 18-8 stainless steel, these inserts have good corrosion resistance. Also known as E-Z Lok, they use Loctite® adhesive to keep them in place. The adhesive reaches full strength after 72 hours. They may be mildly magnetic. Installation requires a drill bit and a standard tap. Then set the insert with an installation bit, a slotted screwdriver, or a bolt with two nuts.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.
For technical drawings and 3-D models, click on a part number.
Black-Phosphate Steel Easy-to-Install Thread-Locking Inserts
A black-phosphate finish provides mild corrosion resistance. Also known as E-Z Lok, these inserts use Loctite® adhesive to keep them in place. The adhesive reaches full strength after 72 hours. Installation requires a drill bit and a standard tap. Then set the insert with a bolt and two nuts, or use an installation bit.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.
To drive slotted inserts, you can use a slotted screwdriver instead of using an installation bit or a bolt and two nuts.
For technical drawings and 3-D models, click on a part number.
316 Stainless Steel Easy-to-Install Thread-Locking Inserts
These inserts are the most corrosion-resistant thread-locking inserts we offer. Also known as E-Z Lok, they use Loctite® adhesive to keep them in place. The adhesive reaches full strength after 72 hours. All have thick walls for strength and can be used to fill a large hole with stripped threads. They may be mildly magnetic. Installation requires a drill bit and a standard tap. Then set the insert with an installation bit, a slotted screwdriver, or a bolt with two nuts.
For technical drawings and 3-D models, click on a part number.
Easy-to-Install Thread-Locking Insert Assortments
These assortments include various sizes of thread-locking inserts. Also known as E-Z Lok, they use Loctite® adhesive to keep them in place. The adhesive reaches full strength after 72 hours. All inserts have thick walls for strength and can be used to fill a large hole.
Black-phosphate steel inserts are mildly corrosion resistant.
For technical drawings and 3-D models, click on a part number.

For Tap | |||||||
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Includes | No. of Inserts Included | Thread Size | Drill Bit Size | For Max. Hole Dia. | Drive Style | Each | |
Inch Assortments | |||||||
Black-Phosphate Steel | |||||||
1/2"-13 Thread × 0.656" Installed Lg. (6 Each) 5/8"-11 Thread × 0.688" Installed Lg. (7 Each) 3/4"-10 Thread × 0.781" Installed Lg. (7 Each) 1"-8 Thread × 1 1/4" Installed Lg. (2 Each) | 22 | 3/4"-10 7/8"-9 1"-8 1 3/8"-12 | 21/32" 49/64" 7/8" 1 9/32" | 21/32" 49/64" 7/8" 1 9/32" | Slotted | 000000000 | 000000 |
For fast installation, use these installation bits with power drills and drill presses.
18-8 Stainless Steel Key-Locking Inserts

Made of stainless steel, these inserts have good corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. Inserts may be mildly magnetic. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.
Inserts with an extra-thick wall are stronger than thick- and thin-wall inserts. Use them to reduce the size of tapped holes.
For technical drawings and 3-D models, click on a part number.
Inserts | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Each | Installation Tools | |||||||||
Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | 1-9 | 10-Up | Each | ||
18-8 Stainless Steel with Thick Wall | ||||||||||
3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1.063" | 4 | 000000000 | 000000 | 000000 | 000000000 | 000000 |
18-8 Stainless Steel with Extra Thick Wall | ||||||||||
3/4"-10 | 1 1/4"-12 | 1 1/8" | 1 3/16" | 1.188" | 4 | 000000000 | 000000 | 00000 | 000000000 | 00000 |
Black-Phosphate Steel Key-Locking Inserts

A black-phosphate finish provides mild corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole with stripped threads.
Inserts with an extra thick wall are stronger than thick- and thin-wall inserts. Use them to reduce the size of tapped holes.
For technical drawings and 3-D models, click on a part number.
Inserts | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Each | Installation Tools | |||||||||
Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | 1-9 | 10-Up | Each | ||
Black-Phosphate Steel with Thick Wall | ||||||||||
3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1 1/16" | 4 | 000000000 | 000000 | 000000 | 000000000 | 000000 |
Black-Phosphate Steel with Extra Thick Wall | ||||||||||
3/4"-10 | 1 1/4"-12 | 1 1/8" | 1 3/16" | 1 3/16" | 4 | 000000000 | 00000 | 00000 | 000000000 | 00000 |
Mil. Spec. Stainless Steel Key-Locking Inserts

These inserts are made to stringent military specifications. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. Inserts may be mildly magnetic. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.
For technical drawings and 3-D models, click on a part number.
Inserts | Installation Tools | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | Specifications Met | Each | Each | ||
303 Stainless Steel with Thick Wall | ||||||||||
3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1.067" | 4 | MS51831-109 | 000000000 | 000000 | 000000000 | 0000000 |
3/4"-10 | 1 1/4"-12 | 1 1/8" | 1 3/16" | 1.192" | 4 | MS51832-109 | 000000000 | 00000 | 000000000 | 00000 |
Mil. Spec. Alloy Steel Key-Locking Inserts

The strongest key-locking inserts we offer, these inserts are made to stringent military specifications. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. Inserts may be mildly magnetic. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.
For technical drawings and 3-D models, click on a part number.
Key-Locking Insert Assortments with Installation Tool

These assortments include various sizes of key-locking inserts with thick and thin walls, and an installation tool. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or convert threads in soft metals such as aluminum. They’re comparable to Keensert® inserts.
18-8 stainless steel inserts are more corrosion resistant than black-phosphate steel. They may be mildly magnetic.
Black-phosphate steel inserts are mildly corrosion resistant.
Choose assortments with thick-wall inserts for greater strength than thin-wall inserts, or to fill a large hole.
For technical drawings and 3-D models, click on a part number.
For Tap | ||||||
---|---|---|---|---|---|---|
Includes | No. of Inserts Included | Thread Size | Drill Bit Size | For Max. Hole Dia. | Each | |
Inch | ||||||
18-8 Stainless Steel with Thick Wall | ||||||
1/4"-20 Thread × 3/8" Installed Lg. (20 Each) 5/16"-18 Thread × 0.438" Installed Lg. (15 Each) 3/8"-16 Thread × 1/2" Installed Lg. (10 Each) 7/16"-14 Thread × 5/8" Installed Lg. (10 Each) 1/2"-13 Thread × 5/8" Installed Lg. (6 Each) 9/16"-12 Thread × 0.813" Installed Lg. (5 Each) 5/8"-11 Thread × 7/8" Installed Lg. (3 Each) 3/4"-10 Thread × 1 1/8" Installed Lg. (3 Each) 7/8"-9 Thread × 1 1/4" Installed Lg. (3 Each) 1"-8 Thread × 1 3/8" Installed Lg. (2 Each) Installation Tool | 77 | 7/16"-14 1/2"-13 9/16"-12 5/8"-11 3/4"-16 7/8"-14 1 1/8"-12 1 1/4"-12 1 3/8"-12 | X 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 0.397" 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 000000000 | 0000000 |
Black-Phosphate Steel with Thick Wall | ||||||
1/4"-20 Thread × 3/8" Installed Lg. (20 Each) 5/16"-18 Thread × 0.438" Installed Lg. (15 Each) 3/8"-16 Thread × 1/2" Installed Lg. (10 Each) 7/16"-14 Thread × 5/8" Installed Lg. (10 Each) 1/2"-13 Thread × 5/8" Installed Lg. (6 Each) 9/16"-12 Thread × 0.813" Installed Lg. (5 Each) 5/8"-11 Thread × 7/8" Installed Lg. (3 Each) 3/4"-10 Thread × 1 1/8" Installed Lg. (3 Each) 7/8"-9 Thread × 1 1/4" Installed Lg. (3 Each) 1"-8 Thread × 1 3/8" Installed Lg. (2 Each) Installation Tool | 77 | 7/16"-14 1/2"-13 9/16"-12 5/8"-11 3/4"-16 7/8"-14 1 1/8"-12 1 1/4"-12 1 3/8"-12 | X 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 0.397" 29/64" 33/64" 37/64" 45/64" 53/64" 1 1/16" 1 3/16" 1 5/16" | 000000000 | 000000 |
Key-Locking Inserts with Installation Tool

Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. These inserts are used to repair or convert threads in soft metals such as aluminum. They’re comparable to Keensert® inserts.
18-8 stainless steel inserts are more corrosion resistant than black-phosphate steel. They may be mildly magnetic.
Black-phosphate steel inserts are mildly corrosion resistant.
Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.
Inserts with an extra thick wall are stronger than thick- and thin-wall inserts. Use them to reduce the size of tapped holes.
For technical drawings and 3-D models, click on a part number.
Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | No. of Inserts Included | Each | |
18-8 Stainless Steel with Thick Wall | ||||||||
---|---|---|---|---|---|---|---|---|
3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1 1/16" | 4 | 3 | 000000000 | 000000 |
Black-Phosphate Steel with Thick Wall | ||||||||
3/4"-10 | 1 1/8"-12 | 1 1/8" | 1 1/16" | 1 1/16" | 4 | 3 | 000000000 | 00000 |
Black-Phosphate Steel with Extra Thick Wall | ||||||||
3/4"-10 | 1 1/4"-12 | 1 1/8" | 1 3/16" | 1 3/16" | 4 | 3 | 000000000 | 000000 |
Screw-Locking Key-Locking Inserts


Forming the strongest hold of any of our threaded inserts, these inserts have a distorted internal thread to lock screws into place and keys that drive into surrounding material to prevent slipping and rotating. This creates a mechanical lock, which is stronger than the chemical lock from adhesive on thread-locking inserts. Because they’re made of a solid piece of metal, these inserts are also stronger than helical inserts, which are made of coiled wire. They're often used in molds, tools and dies, and suspension systems in vehicles to create completely new threads, add strong threads in soft metal, or replace existing threads that are damaged or need to be resized.
A dry-film lubricant makes it easy to install them and screw fasteners in. To install, use a tap to create the threads in your material and an installation tool to drive the keys into the material. All are made to tight tolerances with strictly controlled materials. Many inch sizes also meet military or aerospace standards for dimensions and material.
These inserts resist corrosion in wet environments. Cadmium-plated steel inserts are stronger than stainless steel inserts.
Inserts with thick walls are most commonly used; they’re stronger than thin-wall inserts and are used in larger holes.
For technical drawings and 3-D models, click on a part number.
Inserts | Installation Tools | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Thread Size | For Tap Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | Specifications Met | Each | Each | ||
303 Stainless Steel with Thick Wall | ||||||||||
3/4"-10 | 1 1/8"-12 | 1 1/4" | 1 1/16" | 1 1/16" | 4 | MS51831-109L | 000000000 | 000000 | 000000000 | 0000000 |
Cadmium-Plated Steel with Thick Wall | ||||||||||
3/4"-10 | 1 1/8"-12 | 1 1/4" | 1 1/16" | 1 1/16" | 4 | MS51831-A109L | 000000000 | 00000 | 000000000 | 000000 |
Stainless Steel Helical Inserts

Also known as Heli-Coil inserts, these inserts have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.
For technical drawings and 3-D models, click on a part number.
Inserts | Through-Hole Taps | Closed-End Hole Taps | Installation Tools | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | ||||
18-8 Stainless Steel—Right-Hand Threaded | |||||||||||||
3/4"-10 | 3/4" | 25/32" | 25/32" | MS122-88 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 |
3/4"-10 | 1 1/8" | 25/32" | 25/32" | MS122-128 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
3/4"-10 | 1 1/2" | 25/32" | 25/32" | MS122-168 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
18-8 Stainless Steel—Left-Hand Threaded | |||||||||||||
3/4"-10 | 1 1/8" | 25/32" | 25/32" | __ | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000 | 00 | 000000000 | 00000 |
Stainless Steel Screw-Locking Helical Inserts

A distorted thread grips the screw to resist loosening. Also known as Heli-Coil inserts, these inserts have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.
For technical drawings and 3-D models, click on a part number.
Inserts | Through-Hole Taps | Closed-End Hole Taps | Installation Tools | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | ||||
18-8 Stainless Steel | |||||||||||||
3/4"-10 | 3/4" | 25/32" | 25/32" | MS21209C1210, NASM21209 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 |
3/4"-10 | 1 1/8" | 25/32" | 25/32" | MS21209C1215, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
3/4"-10 | 1 1/2" | 25/32" | 25/32" | MS21209C1220, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
Helical Inserts with Installation Tools


Inserts come with a through-hole tap and installation tool. Also known as Heli-Coil inserts, they have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw.
Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Inserts Included | Includes | Each | |
18-8 Stainless Steel—Right-Hand Threaded | |||||||
---|---|---|---|---|---|---|---|
3/4"-10 | 3/4" | 25/32" | 25/32" | 4 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 0000000 |
3/4"-10 | 1 1/8" | 25/32" | 25/32" | 4 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
3/4"-10 | 1 1/2" | 25/32" | 25/32" | 4 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
18-8 Stainless Steel—Left-Hand Threaded | |||||||
3/4"-10 | 1 1/8" | 25/32" | 25/32" | 2 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
Alloy Steel Socket Nuts
Also known as Allen nuts, use these with socket head cap screws in recessed holes and tight spaces that don't have enough clearance for a wrench. Tighten them with a 6-point hex key. They can also be used as an insert by pressing or drawing them into nonhardened steel, cast iron, or soft nonferrous metal or by molding them into plastic, ceramic, fiber, and similar materials. Made from alloy steel, they're comparable in strength to Grade 9 bolts.
For technical drawings and 3-D models, click on a part number.
Thread Size | OD | Ht. | Threading | Thread Dp. | For Hole Dia. | Hex Key Size | Each | |
Alloy Steel | ||||||||
---|---|---|---|---|---|---|---|---|
3/4"-10 | 1.15" | 1.17" | Partially Threaded | 0.6" | 1.203" | 3/4" | 000000000 | 00000 |