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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Material Material |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Thread Spacing Thread Spacing |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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Threaded Insert Type Threaded Insert Type |
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![]() | Helical |
Locking Type Locking Type |
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Thread Direction Thread Direction |
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For Use In For Use In |
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For Maximum Hole Diameter For Maximum Hole Diameter |
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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.
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About Washers
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How to Install Helical Inserts
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About Helical Insert Length
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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 | ||||||||||||
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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 | |||||||||||||||
M30 | 3.5 | Coarse | 45 | 1 7/32" | 1 7/32" | SAE MA3279-183 | 1 | 000000000 | 00000 | 000000000 | 0000000 | 000000000 | 0000000 | 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 | ||||||||||||
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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 | |||||||||||||||
M30 | 3.5 | Coarse | 45 | 1 7/32" | 1 7/32" | DIN 8140 | 1 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 | 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 | |||||||||
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M30 | 3.5 | Coarse | 45 | 1 1/4" | 1 1/4" | 5 | Through-Hole Tap, Installation Tool | 000000000 | 0000000 |
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.
303 stainless steel locknuts resist corrosion better than steel locknuts but aren’t as strong. They withstand washdowns and chemicals.
For technical drawings and 3-D models, click on a part number.
Locknuts | ||||||||||
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Thread | Spanner Sockets | |||||||||
Size | Pitch, mm | Spacing | OD | Wd., mm | Insert Max. Temp., °F | Specifications Met | Each | Each | ||
Carbon Steel | ||||||||||
Chamfered Face | ||||||||||
M30 | 1.5 | Extra Fine | 45mm | 11.5 | 160° | ISO 2982-2 | 0000000 | 000000 | 00000000 | 0000000 |
Zinc-Plated Carbon Steel | ||||||||||
Chamfered Face | ||||||||||
M30 | 1.5 | Extra Fine | 44mm | 11 | 210° | __ | 0000000 | 00000 | 000000 | 00 |
303 Stainless Steel | ||||||||||
Chamfered Face | ||||||||||
M30 | 1.5 | Extra Fine | 45mm | 11.5 | 160° | ISO 2982-2 | 0000000 | 00000 | 00000000 | 000000 |
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.
Chamfered-face retaining nuts weigh less and produce less heat than stepped-face nuts. They meet ISO 2982 (formerly DIN 981), an international standard for bearing locknut dimensions. Their sizes correspond to SKF KM series. Use them with DIN 5406 spring lock washers.
For technical drawings and 3-D models, click on a part number.
Nuts | ||||||||||||
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Thread | Optional Washers | Spanner Sockets | ||||||||||
Size | Pitch, mm | Spacing | OD, mm | Wd., mm | Specifications Met | For Lock Washer Specifications Met | Each | Each | Each | |||
Carbon Steel | ||||||||||||
Stepped Face | ||||||||||||
M30 | 1.5 | Extra Fine | 50 | 10 | DIN 1804 | DIN 462 | 0000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
Chamfered Face | ||||||||||||
M30 | 1.5 | Extra Fine | 45 | 7 | DIN 981, ISO 2982 | DIN 5406 | 0000000 | 0000 | 000000000 | 0000 | 00000000 | 0000000 |
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 | |||||||
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Size | Pitch, mm | Spacing | OD, mm | Wd., mm | Specifications Met | Each | |
Carbon Steel | |||||||
Stepped Face | |||||||
M30 | 1.5 | Extra Fine | 50 | 10 | DIN 1816 | 0000000 | 000000 |