About Threaded Studs and Rods
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About Nuts, Materials, and Finishes
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About Lifting with Hoist Rings
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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 Socket Head Screws
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Alloy Steel Socket Head Screws

With a tensile strength of 170,000 psi, these alloy steel screws are stronger than Grade 8 steel screws. Length is measured from under the head.
Black-oxide steel screws are mildly corrosion resistant in dry environments.
Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Lg., mm | Threading | Min. Thread Lg., mm | Thread Spacing | Dia., mm | Ht., mm | Drive Size, mm | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
M48 × 5 mm | |||||||||||
Black-Oxide Class 12.9 Alloy Steel | |||||||||||
140 | Partially Threaded | 108 | Coarse | 72 | 48 | 36 | 170,000 | DIN 912 | 1 | 000000000 | 000000 |
180 | Partially Threaded | 108 | Coarse | 72 | 48 | 36 | 170,000 | DIN 912 | 1 | 000000000 | 00000 |
200 | Partially Threaded | 108 | Coarse | 72 | 48 | 36 | 170,000 | DIN 912 | 1 | 000000000 | 00000 |
260 | Partially Threaded | 108 | Coarse | 72 | 48 | 36 | 170,000 | DIN 912 | 1 | 000000000 | 000000 |
300 | Partially Threaded | 108 | Coarse | 72 | 48 | 36 | 170,000 | DIN 912 | 1 | 000000000 | 000000 |
Metric Fine-Thread Medium-Strength Steel Hex Nuts—Class 8

Class 8 nuts are comparable in strength to Class 8.8 bolts and are suitable for fastening most machinery and equipment.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—Class 8 | |||||||
M48 | 3 | 75 | 38 | DIN 934 | 1 | 000000000 | 000000 |
Metric Medium-Strength Steel Hex Nuts—Class 8

Class 8 nuts are comparable in strength to Class 8.8 bolts and are suitable for fastening most machinery and equipment.
Zinc-plated and yellow zinc-plated steel nuts resist corrosion in wet environments.
Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.
For technical drawings and 3-D models, click on a part number.
Metric Low-Strength Steel Hex Nuts

About half the strength of medium-strength steel nuts, these nuts are for light duty fastening applications, such as securing access panels.
Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.
For technical drawings and 3-D models, click on a part number.
Metric High-Strength Steel Hex Nuts—Class 10

About 25% stronger than medium-strength steel nuts, these nuts are comparable in strength to Class 10.9 bolts.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—Class 10 | |||||||
M48 | 5 | 75 | 38 | DIN 934 | 1 | 000000000 | 000000 |
Metric Extreme-Strength Steel Hex Nuts—Class 12

Class 12 nuts are comparable in strength to Class 12.9 bolts. They're about 20% stronger than high-strength steel nuts and often used in heavy machinery, such as earth-moving equipment.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—Class 12 | |||||||
M48 | 5 | 75 | 38 | DIN 934 | 1 | 000000000 | 000000 |
Metric 18-8 Stainless Steel Hex Nuts

These nuts have good chemical resistance and may be mildly magnetic. Metric 18-8 stainless steel is also known as A2 stainless steel.
Black-oxide stainless steel nuts have a dark surface color.
For technical drawings and 3-D models, click on a part number.
Metric Super-Corrosion-Resistant 316 Stainless Steel Hex Nuts

These nuts have excellent chemical resistance and can be used in saltwater environments. They may be mildly magnetic. They're also known as A4 stainless steel.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
316 Stainless Steel | |||||||
M48 | 5 | 75 | 38 | DIN 934 | 1 | 000000000 | 000000 |
Metric Fine-Thread Medium-Strength Steel Thin Hex Nuts


These nuts are half the height of standard hex nuts, and have closely spaced threads to prevent loosening from vibration. They are not compatible with coarse threads. Use them to fasten most machinery and equipment.
Also known as jam nuts, they can be used in place of standard nuts when height clearances are tight, or threaded together to form a locknut. When fastening threaded rod, you can use two nuts to create a point for tightening the rod into place with a wrench. These nuts have less tensile strength than a standard hex nut when used alone.
All meet ISO or DIN standards for dimensions and material composition to ensure compatibility with other products and tools. DIN 936 and DIN 439B standards are no longer active, but they are commonly referenced globally.
Steel nuts without a plating are best for dry environments, since exposure to moisture and chemicals will cause them to rust.
For technical drawings and 3-D models, click on a part number.
Metric Medium-Strength Steel Thin Hex Nuts

Half as thick as regular hex nuts, these metric nuts fit into spaces with low height clearances. They’re a good choice for fastening most machinery and equipment. Also known as jam nuts, they can be threaded together to form a locknut that won’t move or loosen due to vibration. When fastening threaded rod, you can use two nuts to create a point for tightening the rod with a wrench. These nuts have less tensile strength than a standard hex nut when used alone. Made of steel, they’re best for dry environments, since moisture and chemicals will cause them to rust.
Zinc- and zinc yellow-chromate plated steel nuts resist corrosion in wet environments.
DIN 936 nuts are sometimes taller and wider than ISO 4035 nuts. Although it’s no longer active, DIN 936 is still a commonly referenced standard for material and dimensional compatibility.
ISO 4035 (formerly DIN 439B) nuts are chamfered, so their edges are less sharp than DIN 936 nuts. This new ISO standard is functionally the same as the DIN standard it replaced, with slightly different tolerances for width.
For technical drawings and 3-D models, click on a part number.
Metric Extreme-Strength Steel Heavy Hex Nuts—Grade 2H


About 10% wider and taller than standard hex nuts, these metric-sized heavy hex nuts distribute the load over a large area. Grade 2H nuts are comparable in strength to Class 12.9 bolts. They're about 20% stronger than high-strength steel nuts and are used in heavy machinery, such as earth-moving equipment.
Fine threads are closely spaced to prevent loosening from vibration.
For technical drawings and 3-D models, click on a part number.
Metric Medium-Strength Steel Nylon-Insert Locknuts—Class 8

Made from medium-strength steel with a nylon insert, these Class 8 metric locknuts are strong enough to use on most machinery and equipment that’s prone to vibration and temperature changes. The nylon insert also won’t damage the threads on your bolt. All are reusable, but their holding power lessens with each use. Pair them with compatible Class 8.8 metric bolts.
Most of these locknuts meet ISO 7040 or ISO 10511 (formerly DIN 982 or DIN 985), which are international standards for dimensions. The ISO standards are functionally equivalent to the DIN standards with slight differences in width, height, or tolerances.
Zinc- and zinc yellow-chromate plated steel locknuts are a good option in dry environments. The zinc plating prevents the steel from corroding until the plating wears away.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | ||||||||
M48 | 5 | 75 | 48 | 220° | DIN 985, ISO 10511 | 1 | 000000000 | 000000 |
Metric Fine-Thread Medium-Strength Steel Nylon-Insert Locknuts—Class 8

Get a grip on metric bolts exposed to vibration, wear, and changes in temperature. These metric locknuts have a nylon insert that holds onto bolts without damaging their threads. They have fine-pitch threads, which are closer together than coarse-pitch threads and less likely to loosen from vibration. Fine threads and coarse threads are not compatible. These locknuts are reusable but lose holding power with each use.
Made of Class 8 steel, these nuts are strong enough for use with most machinery and equipment. A zinc plating prevents rust in wet and damp areas. Combine them with Class 8.8 metric bolts, which are comparable in strength.
These locknuts meet the dimensional and material standards of DIN and ISO that make sure they're compatible with other parts and tools. Although DIN 982 and 985 are no longer active standards, they’re still a common reference point for designers. With only slight differences in tolerance, ISO 7040 and 10511 have replaced the inactive DIN standards.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | ||||||||
M48 | 3 | 75 | 48 | 220° | ISO 10511, DIN 985 | 1 | 000000000 | 000000 |
Metric Medium-Strength Steel Locknuts for use with Cotter Pins—Class 8


Often referred to as castle nuts, secure these by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included.
Steel locknuts are best for dry environments, since moisture will cause them to rust. They are weldable and can be painted or finished.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | For Cotter Pin Dia., mm | Min. Slot Wd., mm | Min. Slot Dp., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—Class 8 | ||||||||||
M48 | 5 | 75 | 50 | 8 | 9 | 12 | DIN 935 | 1 | 000000000 | 000000 |
Metric Medium-Strength Steel Threaded Rods—Grade B7

Made of Grade B7 steel, the tensile strength of these threaded rods is one and a half times higher than low-strength steel threaded rods. They also meet the pressure and temperature requirements of ASTM A193 and are often used to secure pressure tanks, valves, and flanges.
For technical drawings and 3-D models, click on a part number.
Medium-Strength Steel Threaded Rods—Class 8.8

An economical alternative to Grade B7 and Grade B16 threaded rods, these metric Class 8.8 rods are suitable for fastening most machinery and equipment.
Zinc-plated steel threaded rods resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Metric High-Strength Steel Threaded Rods—Class 10.9

These Class 10.9 steel threaded rods are about 25% stronger than medium-strength steel rods.
For technical drawings and 3-D models, click on a part number.
Metric 18-8 Stainless Steel Threaded Rods

These 18-8 stainless steel threaded rods have good chemical resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
Lg. | Thread Pitch, mm | Tensile Strength, psi | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||
---|---|---|---|---|---|---|---|
M48 | |||||||
1 m | 5 | 70,000 | Not Rated | DIN 976 | 1 | 000000000 | 0000000 |
Metric Threaded on Both Ends Studs

Also known as setup studs, these studs withstand sideways forces better than fully threaded studs because they have an unthreaded middle that is stronger than the treaded ends. The unthreaded middle also makes more contact with unthreaded holes, which creates better alignment than a fully threaded stud.
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.
Thread | Zinc-Plated Carbon Steel | ||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Spacing | OD | Wd., mm | Insert Max. Temp., °F | Each | |
Chamfered Face | |||||||
M48 | 1.5 | Extra Fine | 64mm | 13.5 | 210° | 0000000 | 000000 |
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 | |||||||
M48 | 1.5 | Extra Fine | 75 | 13 | DIN 1816 | 0000000 | 000000 |
Eyebolts—For Lifting

Also known as machinery eyebolts.
Zinc-plated steel eyebolts offer good corrosion resistance.
Note: Capacities listed are for vertical lifting only. Eyebolts with shoulder can be used for angular lifting up to 45°, but the capacities will be significantly reduced. For angular lifting, we recommend Hoist Rings.
Warning: Never use to lift people or items over people.
For technical drawings and 3-D models, click on a part number.
Rotating Eyebolts—For Lifting

Unlike conventional eyebolts, you can rotate the eye 360° to match the angle of your load.
Powder-coated steel eyebolts are impact resistant, but less corrosion resistant than stainless steel eyebolts. They include a removable key for tightening the bolt.
Note: Capacities listed are for vertical lifting only. Eyebolts with shoulder can be used for angular lifting up to 45°, but the capacities will be significantly reduced. For angular lifting, we recommend Hoist Rings.
Warning: Never use to lift people or items over people.
For technical drawings and 3-D models, click on a part number.

Thread | With Shoulder | ||||||||
---|---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Lg., mm | Shank Lg., mm | Overall Lg., mm | Eye Dia., mm | Vertical Capacity, lbs. | Color | Each | |
Powder-Coated Steel | |||||||||
M48 | 5 | 72 | 72 | 252 | 96 | 26,450 | Pink | 00000000 | 0000000 |
Hoist Rings—For Lifting



Designed for angular lifting, hoist rings resist stresses that would bend or break an eyebolt. They have a lifting ring that pivots 180° front to back and a base that swivels 360° to compensate for pitch, roll, and sway when lifting heavy or unbalanced loads. Install the base of the hoist ring flush to the mounting surface and tighten to the recommended torque that is stamped on the ring. Torque wrenches are sold separately.
Machined hoist rings have a smooth finish to protect slings and hooks from damage and excess wear during lifting.
Black-oxide steel hoist rings have mild corrosion resistance.
Hoist rings that are CE marked meet European safety standards.
Note: Capacities listed are for vertical lifting only. As the lift angle changes from vertical, the amount of weight the hoist ring can lift is significantly reduced. For example, when lifting a 1,000 lb. load at a 45° angle, you must choose a hoist ring with a capacity of at least 1,400 lbs. Do not use at an angle less than 30°.
Warning: Never use to lift people or items over people.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Pitch, mm | Thread Lg., mm | Inside Wd., mm | Overall Ht., mm | Vertical Capacity, lbs. | Movement | Specifications Met | Each | |
Machined Black-Oxide Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
M48 | 5 | 79 | 114 | 396 | 29,750 | 180° Pivot and 360° Swivel | ASME B30.26, CE Marked, MIL-STD-1365, MIL-STD-209 | 00000000 | 0000000 |
Swivel-Under-Load Hoist Rings—For Lifting



The ball bearing on these hoist rings makes it easy to rotate your load even after it’s suspended. For unbalanced or heavy loads, the base also swivels to compensate for pitch, roll, and sway. Their lifting ring pivots 180° front to back. Ideal for angular lifting, these hoist rings withstand stresses that bend or break eyebolts.
Install the base of these hoist rings flush to your mounting surface. Use a torque wrench to tighten to the recommended torque stamped on the ring.
Note: Capacities listed are for vertical lifting only. As the lift angle changes from vertical, the amount of weight the hoist ring can lift is significantly reduced. For example, when lifting a 1,000 lb. load at a 45° angle, you must choose a hoist ring with a capacity of at least 1,400 lbs. Do not use at an angle less than 30°.
Warning: Never use to lift people or items over people.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Pitch, mm | Thread Lg., mm | Inside Wd., mm | Overall Ht., mm | Vertical Capacity, lbs. | Movement | Specifications Met | Each | |
Yellow Powder-Coated Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
M48 | 5 | 72 | 70 | 342 | 31,740 | 180° Pivot and 360° Swivel | ASME B30.26, CE Marked | 0000000 | 0000000 |
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.
For technical drawings and 3-D models, click on a part number.

Base | Fully Threaded | |||||||
---|---|---|---|---|---|---|---|---|
Thread Size | Thread Pitch, mm | For Slot Wd., mm | Ht., mm | Wd., mm | O'all Ht., mm | Specifications Met | Each | |
Black-Oxide Steel | ||||||||
M48 | 5 | 54 | 34 | 85 | 70 | DIN 508 | 000000000 | 0000000 |