System of Measurement System of Measurement |
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Thread Size Thread Size | Show |
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Thread Type Thread Type |
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Threaded Insert Type Threaded Insert Type |
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Key Locking | Helical |
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Thread Locking |
Nut Type Nut Type |
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Flange | Locknut |
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Platform | Round |
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Socket Head |
Material Material |
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Component Component |
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![]() | Ball Nut |
Thread Direction Thread Direction |
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Diameter Diameter |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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For Use In For Use In |
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Thread Spacing Thread Spacing |
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Helical Insert Style Helical Insert Style |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Travel Distance per Turn Travel Distance per Turn |
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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 Shaft Collars
Shaft collars are useful for holding and positioning components on a shaft. They can also serve as mechanical stops and stroke limiters.
More
Selecting Compatible Lead Screws and Nuts
More
About Washers
More
About Nuts, Materials, and Finishes
More
How to Install Key-Locking Inserts
More
How to Install Helical Inserts
More
About Helical Insert Length
More
Stainless Steel Socket Nuts

These nuts are chemical resistant and may be mildly magnetic. Also known as Allen nuts, use them 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.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Pitch | OD | Ht. | Threading | Thread Dp. | For Hole Dia. | Hex Key Size | Each | |
18-8 Stainless Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
M14 | 2mm | 20mm | 21.3mm | Partially Threaded | 11.4mm | 21.1mm | 1/2" | 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 | Thread Pitch | OD | Ht. | Threading | Thread Dp. | For Hole Dia. | Hex Key Size | Each | |
Alloy Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
M14 | 2 mm | 20mm | 24mm | Partially Threaded | 11.4mm | 21.1mm | 1/2" | 000000000 | 000000 |
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.
For technical drawings and 3-D models, click on a part number.
Inserts | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Tap | Each | Installation Tools | |||||||||||
Thread Size | Thread Pitch, mm | Thread Spacing | Thread Size | Thread Pitch, mm | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Locking Keys | 1-9 | 10-Up | Each | ||
Black-Phosphate Steel with Thick Wall | |||||||||||||
M14 | 2 | Coarse | 7/8"-14 | __ | 0.81" | 53/64" | 53/64" | 4 | 000000000 | 00000 | 00000 | 000000000 | 000000 |
M14 | 2 | Coarse | M20 | 1.5 | 20mm | 18.75 mm | 18.75mm | 4 | 000000000 | 00000 | 00000 | 000000000 | 00000 |
M14 | 1.5 | Fine | M20 | 1.5 | 20mm | 18.75 mm | 18.75mm | 4 | 000000000 | 00000 | 00000 | 000000000 | 00000 |
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.
For technical drawings and 3-D models, click on a part number.
Inserts | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Tap | Each | Installation Tools | |||||||||||
Thread Size | Thread Pitch, mm | Thread Spacing | Thread Size | Thread Pitch, mm | 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 | |||||||||||||
M14 | 2 | Coarse | 7/8"-14 | __ | 0.81" | 53/64" | 0.828" | 4 | 000000000 | 000000 | 000000 | 000000000 | 000000 |
M14 | 2 | Coarse | M20 | 1.5 | 20mm | 18.75 mm | 18.75mm | 4 | 000000000 | 00000 | 00000 | 000000000 | 00000 |
M14 | 1.5 | Fine | M20 | 1.5 | 20mm | 18.75 mm | 18.75mm | 4 | 000000000 | 00000 | 00000 | 000000000 | 00000 |
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.
For Tap | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Thread Pitch, mm | Thread Spacing | Thread Size | Thread Pitch, mm | 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 | |||||||||||
M14 | 2 | Coarse | M20 | 1.5 | 20mm | 18.75 mm | 18.75mm | 4 | 4 | 000000000 | 0000000 |
M14 | 1.5 | Fine | M20 | 1.5 | 20mm | 18.75 mm | 18.75mm | 4 | 4 | 000000000 | 000000 |
Black-Phosphate Steel with Thick Wall | |||||||||||
M14 | 2 | Coarse | 7/8"-14 | __ | 0.81" | 53/64" | 53/64" | 4 | 3 | 000000000 | 00000 |
M14 | 2 | Coarse | M20 | 1.5 | 20mm | 18.75 mm | 18.75mm | 4 | 4 | 000000000 | 00000 |
M14 | 1.5 | Fine | M20 | 1.5 | 20mm | 18.75 mm | 18.75mm | 4 | 4 | 000000000 | 00000 |
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.
Inserts that meet DIN 8140 adhere to international standards for dimensions.
For technical drawings and 3-D models, click on a part number.
Inserts | Through-Hole Taps | Closed-End Hole Taps | Installation Tools | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Thread Pitch, mm | Thread Spacing | Installed Lg., mm | Drill Bit Size | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | ||||
18-8 Stainless Steel—Right-Hand Threaded | |||||||||||||||
M14 | 2 | Coarse | 14 | 14.5 mm | 14.5mm | DIN 8140, SAE MA3279-116 | 5 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
M14 | 2 | Coarse | 21 | 14.5 mm | 14.5mm | DIN 8140, SAE MA3279-166 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M14 | 1.5 | Fine | 21 | 37/64" | 37/64" | SAE MA3279-165 | 5 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
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.
Inserts that meet DIN 8140 adhere to international standards for dimensions.
For technical drawings and 3-D models, click on a part number.
Inserts | Through-Hole Taps | Closed-End Hole Taps | Installation Tools | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Thread Pitch, mm | Thread Spacing | Installed Lg., mm | Drill Bit Size | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | ||||
18-8 Stainless Steel | |||||||||||||||
M14 | 2 | Coarse | 14 | 14.5 mm | 14.5mm | SAE MA3329-116 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
M14 | 2 | Coarse | 21 | 14.5 mm | 14.5mm | DIN 8140, SAE MA3329-166 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M14 | 1.5 | Fine | 21 | 37/64" | 37/64" | DIN 8140, SAE MA3329-165 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
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 | Thread Pitch, mm | Thread Spacing | Installed Lg., mm | Drill Bit Size | For Max. Hole Dia. | No. of Inserts Included | Includes | Each | |
18-8 Stainless Steel—Right-Hand Threaded | |||||||||
---|---|---|---|---|---|---|---|---|---|
M14 | 1.5 | Fine | 21 | 9/16" | 9/16" | 5 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 0000000 |
M14 | 2 | Coarse | 21 | 37/64" | 37/64" | 12 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
Spark Plug Thread Repair Kits

Kits include helical inserts, a tap, and an 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.
Includes | No. of Inserts Included | Each | |
18-8 Stainless Steel | |||
---|---|---|---|
M14×1.25 mm Thread × 3/8" Insert Reach (6 Each) M14×1.25 mm Thread × 7/16" Insert Reach (6 Each) M14×1.25 mm Thread × 0.472" Insert Reach (6 Each) M14×1.25 mm Thread × 1/2" Insert Reach (6 Each) M14×1.25 mm Thread × 3/4" Insert Reach (6 Each) Through-Hole Tap Installation Tool | 30 | 000000000 | 0000000 |
Spark Plug Thread Repair Kits for Gasket-Seat and Taper-Seat Ports

These kits have short-, normal-, and long-reach inserts, an installation tool, and a tap.
Includes | No. of Inserts Included | Each | |
18-8 Stainless Steel | |||
---|---|---|---|
M14×1.25 mm Thread × Short Insert Reach (1 Each) M14×1.25 mm Thread × Normal Insert Reach (1 Each) M14×1.25 mm Thread × Long Insert Reach (1 Each) Through-Hole Tap Installation Tool | 3 | 000000000 | 000000 |
M14×1.25 mm Thread × Short Insert Reach (6 Each) M14×1.25 mm Thread × Normal Insert Reach (6 Each) M14×1.25 mm Thread × Long Insert Reach (6 Each) Through-Hole Tap Installation Tool | 18 | 000000000 | 00000 |
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.


Inserts | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Tap | Installation Bits | ||||||||||||
Thread Size | Thread Pitch, mm | Thread Spacing | Thread Size | Thread Pitch, mm | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | Drive Style | Pkg. Qty. | Pkg. | Each | ||
Black-Phosphate Steel with Thick Wall | |||||||||||||
M14 | 2 | Coarse | 7/8"-9 | __ | 11/16" | 49/64" | 49/64" | Slotted | 5 | 000000000 | 000000 | 000000000 | 000000 |
M14 | 1.25 | Extra Fine | 3/4"-16 | __ | 21/64" | 11/16" | 11/16" | __ | 5 | 000000000 | 0000 | 000000 | 00 |
M14 | 1.25 | Extra Fine | 3/4"-16 | __ | 29/64" | 11/16" | 11/16" | __ | 5 | 000000000 | 0000 | 000000 | 00 |
M14 | 1.25 | Extra Fine | 3/4"-16 | __ | 45/64" | 11/16" | 11/16" | __ | 1 | 000000000 | 0000 | 000000 | 00 |
M14 | 1.25 | Extra Fine | M18 | 1.5 | 11.5mm | 16.5 mm | 16.5mm | __ | 1 | 000000000 | 0000 | 000000 | 00 |
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.
Bearing Retaining Locknuts


With a nylon insert that grips your threaded shaft or spindle without damaging its threads, these locknuts—also called shaft nuts—hold bearings, bushings, gears, and pulleys prone to vibration tightly in place. They come as one piece, so you can easily clamp them onto your shaft or spindle. But, since they aren’t made entirely of metal, they don’t stand up to heat as well as all-metal locknuts. Slots in their sides mean you can tighten and loosen them with a spanner wrench or spanner socket. Their face is also chamfered to help keep the size and weight of your assembly at a minimum. All meet international standards for bearing locknut dimensions.
When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.
All carbon steel locknuts are strong and resist wear, though they don’t stand up to corrosion as well as stainless steel locknuts. Zinc-plated steel locknuts resist rusting from some moisture, but you shouldn’t use them with salt water or chemicals.
For technical drawings and 3-D models, click on a part number.
Bearing Retaining Nuts

Often paired with spring lock washers to strengthen their hold, these retaining nuts—also known as shaft nuts—keep vibration from shifting bearings, bushings, pulleys, and gears on your threaded shaft or spindle. They have slotted sides, so you can tighten and loosen them with a spanner wrench or spanner socket. Made of carbon steel, they’re strong and wear resistant.
Use stepped-face retaining nuts with DIN 462 spring lock washers. You can also use them in pairs or with other bearing retaining nuts as jam nuts. For the nut closer to the bearing, position the stepped face towards the bearing. All meet DIN standards for bearing lockout dimensions.
For technical drawings and 3-D models, click on a part number.
Bearing Retaining Jam Nuts


Used in pairs or with another bearing retaining nut, these jam nuts—often called shaft nuts—hold bearings, bushings, pulleys, and gears in place on your threaded shaft or spindle. Threading two nuts tightly against each other makes it harder for vibration to loosen your assembly than if you used only one nut. For the nut closer to the bearing, position the stepped face towards the bearing. These jam nuts have holes on the side, so you can tighten and loosen them with a pin spanner wrench. Made of carbon steel, they’re strong and wear resistant. All meet DIN 1816, an international standard for bearing locknut dimensions.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Spacing | OD, mm | Wd., mm | Specifications Met | Each | |
Carbon Steel | |||||||
Stepped Face | |||||||
M14 | 1.5 | Fine | 30 | 7 | DIN 1816 | 0000000 | 000000 |
Metric Ball Screws and Nuts

Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. Also known as single-start ball screws and nuts, these have a single thread that runs the length of the screw. They operate with more torque than fast-travel ball screws and nuts. To ensure compatibility, select components that have the same thread size and travel distance per turn. Ball nuts are furnished with a tube to keep ball bearings in place. Do not remove the tube until you are ready to install the nuts onto the screws.
Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.
For technical drawings and 3-D models, click on a part number.

Thread Size | Lg., mm | Wd., mm | Ht., mm | Center Ht., mm | No. of Thread Starts | Travel Distance per Turn, mm | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash, mm | Temperature Range, °F | Each | |
Alloy Steel | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
M14 | 35 | 34 | 30 | 13 | 1 | 4 | Rockwell C58 | 1,200 | 0.1 | 5° to 175° | 0000000 | 0000000 |

Thread Size | Lg., mm | Dia., mm | Wd., mm, mm | Ht., mm | Thick., mm | No. of Thread Starts | Travel Distance per Turn, mm | Hardness | Dynamic Thrust Load Cap., lbs. | Max. Backlash, mm | Temperature Range, °F | Each | |
Alloy Steel | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
M14 | 40 | 31 | 50 | 37 | 10 | 1 | 4 | Rockwell C58 | 1,200 | 0.1 | 5° to 175° | 0000000 | 0000000 |