About Leveling Mounts
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About Nuts, Materials, and Finishes
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About Threaded Studs and Rods
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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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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 | ||||||||||
7/8"-9 | 1 1/4"-12 | 1 1/4" | 1 3/16" | 1.188" | 4 | 000000000 | 000000 | 000000 | 000000000 | 000000 |
18-8 Stainless Steel with Extra Thick Wall | ||||||||||
7/8"-9 | 1 3/8"-12 | 1 1/4" | 1 5/16" | 1.313" | 4 | 000000000 | 000000 | 000000 | 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 | ||||||||||
7/8"-9 | 1 1/4"-12 | 1 1/4" | 1 3/16" | 1.192" | 4 | MS51831-110 | 000000000 | 000000 | 000000000 | 0000000 |
7/8"-9 | 1 3/8"-12 | 1 1/4" | 1 5/16" | 1.317" | 4 | MS51832-110 | 000000000 | 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 | ||||||||||
7/8"-9 | 1 1/4"-12 | 1 1/4" | 1 3/16" | 1 3/16" | 4 | 000000000 | 000000 | 000000 | 000000000 | 000000 |
Black-Phosphate Steel with Extra Thick Wall | ||||||||||
7/8"-9 | 1 3/8"-12 | 1 1/4" | 1 5/16" | 1 5/16" | 4 | 000000000 | 00000 | 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.
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. 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.
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.
For technical drawings and 3-D models, click on a part number.
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 | |||||||||||||
7/8"-9 | 7/8" | 29/32" | 29/32" | MS122-89 | 1 | 000000000 | 00000 | 000000000 | 0000000 | 000000000 | 0000000 | 000000000 | 000000 |
7/8"-9 | 1.312" | 29/32" | 29/32" | MS122-129 | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 000000 | 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.
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 | |||||||
---|---|---|---|---|---|---|---|
7/8"-9 | 1.312" | 29/32" | 29/32" | 6 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 0000000 |
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.
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 | ||||||||
---|---|---|---|---|---|---|---|---|
7/8"-9 | 1.36" | 1.34" | Partially Threaded | 0.7" | 1.418" | 7/8" | 000000000 | 000000 |
Threaded on One End Studs

Use the unthreaded end as a pivot point, hinge, shaft, or locator pin. Made from 18-8 stainless steel, these studs are chemical resistant and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
Shaft | ||||||||
---|---|---|---|---|---|---|---|---|
Lg. | Thread Lg. | Lg. | Dia. | Dia. Tolerance | Tensile Strength, psi | Hardness | Each | |
18-8 Stainless Steel | ||||||||
7/8"-9 | ||||||||
3" | 2" | 1" | 7/8" | -0.03" to 0.03" | 70,000 | Not Rated | 000000000 | 000000 |
4" | 2" | 2" | 7/8" | -0.03" to 0.03" | 70,000 | Not Rated | 000000000 | 00000 |
5" | 2" | 3" | 7/8" | -0.03" to 0.03" | 70,000 | Not Rated | 000000000 | 00000 |
6" | 2" | 4" | 7/8" | -0.03" to 0.03" | 70,000 | Not Rated | 000000000 | 00000 |
Installation Bits for Slotted-Drive Inserts

For fast installation, use these installation bits with power drills and drill presses.
For technical drawings and 3-D models, click on a part number.
For Thread Size | Hex Shank Size | Each | |
7/8"-9, 7/8"-14 | 3/8" | 000000000 | 000000 |
Installation Tools for Key-Locking Inserts

Place the tip of these tools into an insert and strike them with a hammer to drive the keys into the material. They’re compatible with Keensert® inserts.
For technical drawings and 3-D models, click on a part number.
Heavy Duty Installation Tools for Key-Locking Inserts

Install Keensert®-style inserts.
Tools that feature a spring have a knurled grip on that lets you screw inserts into tapped holes, reducing hand fatigue if you’re installing many of them. To fit over inserts evenly, tools have an inner plug and outer ring that align with keys. Strike tools with a hammer to drive keys. The spring along the shaft returns the striking end to its original position to generate more force.
Choose tools that match your insert’s thread size and tap thread size.
For technical drawings and 3-D models, click on a part number.
Installation Tools for Helical Inserts

Screw an insert onto these tools and drive them a quarter to half-turn below the material’s surface. They’re compatible with helical inserts that have a prong.

For Thread Size | Style | Each | |
For Right-Hand Thread | |||
---|---|---|---|
7/8"-9 | D | 000000000 | 000000 |
Extraction Tools for Helical Inserts

Place the tip of these tools into an insert and strike a light blow to the tool’s head. Then turn the tools counterclockwise with pressure to extract the insert.
For Thread Size | Each | |
7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 1/2"-28, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 5/8"-24, 3/4"-10, 3/4"-16, 3/4"-20, 7/8"-9, 7/8"-14, 7/8"-20, 1"-8, 1"-12, 1"-14, M12, M14, M16, M18, M20, M22, M24 | 000000000 | 000000 |
Nickel-Plated Steel Swivel Leveling Mounts with Threaded Stud



Nickel-plated steel has some corrosion resistance. Mounts have a ball-and-socket design that swivels to compensate for uneven floors. In addition to leveling, mounts raise equipment off the floor for easier cleaning and inspection.
Mounts with a cushion are nonskid for an extra measure of stability.
For technical drawings and 3-D models, click on a part number.
Yellow Zinc-Plated Steel Swivel Leveling Mounts with Threaded Stud



Yellow zinc-plated steel is more corrosion resistant than nickel-plated steel. Mounts have a ball-and-socket design that swivels to compensate for uneven floors. In addition to leveling, mounts raise equipment off the floor for easier cleaning and inspection.
Mounts with a cushion are nonskid for an extra measure of stability.
For technical drawings and 3-D models, click on a part number.
Black-Oxide Steel Swivel Leveling Mounts with Threaded Stud



Black-oxide steel has a dull shine for areas where appearance is a concern. Mounts have a ball-and-socket design that swivels to compensate for uneven floors. In addition to leveling, mounts raise equipment off the floor for easier cleaning and inspection.
Mounts with a cushion are nonskid for an extra measure of stability.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Lg. | Capacity per Mount, lbs. | Base Dia. | Overall Ht. | Hex Nut Wd. | Temperature Range, °F | Each | |
Black Oxide Steel with Zinc-Plated Steel Stud | ||||||||
---|---|---|---|---|---|---|---|---|
7/8"-9 | 4" | 15,000 | 4" | 5 7/8" | 1 3/8" | -20° to 170° | 00000000 | 000000 |
Black Oxide Steel with Rubber Cushion and Zinc-Plated Steel Stud | ||||||||
7/8"-9 | 4" | 11,250 | 4" | 6" | 1 3/8" | -20° to 170° | 00000000 | 00000 |
Plastic Swivel Leveling Mounts with Threaded Stud



An economical choice for applications in corrosive environments that don't require high load capacities, these mounts have a plastic base. Their ball-and-socket design swivels to compensate for uneven floors. In addition to leveling, mounts raise equipment off the floor for easier cleaning and inspection.
Mounts with a cushion are nonskid for an extra measure of stability.
For technical drawings and 3-D models, click on a part number.
Corrosion-Resistant Swivel Leveling Mounts with Threaded Stud



Made entirely of stainless steel, these mounts resist corrosion from water and most chemicals. Their ball-and-socket design swivels to compensate for uneven floors. In addition to leveling, mounts raise equipment off the floor for easier cleaning and inspection.
Mounts with a cushion are nonskid for an extra measure of stability.
For technical drawings and 3-D models, click on a part number.
Yellow Zinc-Plated Steel Swivel Leveling Mounts with Threaded Hole


Yellow zinc-plated steel is more corrosion resistant than nickel-plated steel. Mounts have a ball-and-socket design that swivels to compensate for uneven floors. Add your own threaded stud or bolt to build a mount that fits your needs. In addition to leveling, mounts raise equipment off the floor for easier cleaning and inspection.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Dp. | Capacity per Mount, lbs. | Base Dia. | Overall Ht. | Hex Nut Wd. | Temperature Range, °F | Each | |
Yellow Zinc-Plated Steel | ||||||||
---|---|---|---|---|---|---|---|---|
7/8"-9 | 13/16" | 15,000 | 4" | 1 7/8" | 1 3/8" | -20° to 170° | 00000000 | 000000 |
Corrosion-Resistant Swivel Leveling Mounts with Threaded Hole


Made of stainless steel, these mounts resist corrosion from water and most chemicals. Their ball-and-socket design swivels to compensate for uneven floors. Add your own threaded stud or bolt to build a mount that fits your needs. In addition to leveling, mounts raise equipment off the floor for easier cleaning and inspection.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Dp. | Capacity per Mount, lbs. | Base Dia. | Overall Ht. | Hex Nut Wd. | Each | |
303 Stainless Steel | |||||||
---|---|---|---|---|---|---|---|
7/8"-9 | 13/16" | 15,000 | 4" | 1 7/8" | 1 3/8" | 00000000 | 000000 |
T-Slot Nuts

Designed to slide into T-slot tracks on machine tool tables, use these nuts to secure clamps and workpieces.
Fully threaded nuts allow a stud to extend beyond the bottom of the nut. Partially threaded nuts keep studs from traveling past the bottom of the nut and damaging your table.
For technical drawings and 3-D models, click on a part number.

Base | Fully Threaded | Partially Threaded | ||||||
---|---|---|---|---|---|---|---|---|
Thread Size | For Slot Wd. | Ht. | Wd. | O'all Ht. | Each | Each | ||
Black-Oxide Steel | ||||||||
7/8"-9 | 1" | 5/8" | 1 5/8" | 1" | 000000000 | 00000 | 000000000 | 00000 |
7/8"-9 | 1 1/16" | 11/16" | 1 5/8" | 1 1/8" | 000000000 | 00000 | 000000000 | 00000 |
7/8"-9 | 1 1/8" | 3/4" | 1 3/4" | 1 1/2" | 000000000 | 00000 | 000000000 | 00000 |
7/8"-9 | 1 5/16" | 15/16" | 2" | 1 1/4" | 000000000 | 00000 | 000000000 | 00000 |
T-Slot Nut and Setup Stud Kits


For mounting items to your machine table, these kits contain the full system of necessary components. Choose the kit with slot width matching that of your table.
Each kit includes T-slot nuts, setup studs, flange nuts, coupling nuts, and a T-slot cleaning tool.
T-Slot Nut | Setup Stud | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
For Slot Wd. | No. of Pieces | Includes | Threading | Base Ht. | Base Wd. | Overall Ht. | Threading | Min.Tensile Strength, psi | Material | Each | |
7/8"-9 Thread Size | |||||||||||
1" | 37 | 4 T-Slot Nuts 4 Setup Studs each in 3", 4", 5", 6", 7", and 8" Lengths 4 Flange Nuts 4 Coupling Nuts 1 T-Slot Cleaner | Partially Threaded | 5/8" | 1 5/8" | 1" | Threaded on Both Ends | 125,000 | Black-Oxide Steel | 0000000 | 0000000 |
1 1/16" | 37 | 4 T-Slot Nuts 4 Setup Studs each in 3", 4", 5", 6", 7", and 8" Lengths 4 Flange Nuts 4 Coupling Nuts 1 T-Slot Cleaner | Partially Threaded | 11/16" | 1 5/8" | 1 1/8" | Threaded on Both Ends | 125,000 | Black-Oxide Steel | 0000000 | 000000 |
1 1/8" | 37 | 4 T-Slot Nuts 4 Setup Studs each in 3", 4", 5", 6", 7", and 8" Lengths 4 Flange Nuts 4 Coupling Nuts 1 T-Slot Cleaner | Partially Threaded | 3/4" | 1 3/4" | 1 1/2" | Threaded on Both Ends | 125,000 | Black-Oxide Steel | 0000000 | 000000 |
Setup Clamps with Threaded Hole


Instead of a step block, support these clamps using a screw, leveling mount, or any other threaded object. Use with T-slot nuts or bolts to secure a workpiece, vise, or fixture to a machine table.
For technical drawings and 3-D models, click on a part number.
For Stud Dia. | Thread Size | Lg. | Wd. | Ht. | Slot Lg. | Edge-to-Slot Lg. | Each | |
Steel | ||||||||
---|---|---|---|---|---|---|---|---|
7/8" | 7/8"-9 | 10" | 2 1/2" | 1 3/8" | 2 5/8" | 3 3/4" | 0000000 | 000000 |