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About Nuts, Materials, and Finishes
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Sanitary Low-Profile Cap Nuts

Certified by EHEDG (European Hygienic Engineering and Design Group) to meet sanitary design standards, these cap nuts fit into tight spaces to cover and seal exposed threads in your food processing facility. Also known as acorn nuts, they’re at least 20% shorter than standard cap nuts. Made from 316 stainless steel, these nuts won’t corrode from frequent washdowns with water or harsh cleaners. They are self-draining, meaning that they don’t have horizontal surfaces, so liquids and debris will drain off completely. They also have extremely smooth sides and rounded edges to eliminate crevices where bacteria could grow.
The silicone seal at the base of the nut keeps contaminants off the threads and prevents an unsanitary metal-to-metal connection. It’s made with metal and chemical additives, so you can find it with a metal detector or X-ray machine if it falls into your line. This helps you comply with Hazard Analysis and Critical Control Point (HACCP) programs to keep contaminated food from leaving your facility. The seal is also FDA compliant, so it’s safe for direct contact with food.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
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Size | Pitch | Dp. | Wd. | Ht. | Performance Properties | Specifications Met | Each | |
316 Stainless Steel—Silicone Rubber Seal | ||||||||
Inch | ||||||||
1/4"-20 | __ | 1/4" | 7/16" | 21/64" | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 00000 |
5/16"-18 | __ | 9/32" | 1/2" | 25/64" | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 0000 |
3/8"-16 | __ | 5/16" | 9/16" | 15/32" | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 0000 |
7/16"-14 | __ | 21/64" | 11/16" | 33/64" | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 00000 |
1/2"-13 | __ | 11/32" | 3/4" | 35/64" | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 00000 |
5/8"-11 | __ | 7/16" | 15/16" | 43/64" | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 00000 |
Metric | ||||||||
M6 | 1 mm | 5.5mm | 10mm | 8mm | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 00000 |
M8 | 1.25 mm | 6.5mm | 13mm | 10mm | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 00000 |
M10 | 1.5 mm | 8mm | 16mm | 12mm | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 00000 |
M12 | 1.75 mm | 9mm | 18mm | 14mm | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 00000 |
M16 | 2 mm | 10.5mm | 24mm | 17mm | Metal Detectable, X-Ray Detectable | EHEDG Certified, FDA Compliant 21 CFR 177.2600 | 000000000 | 00000 |
Stainless Steel Sealing Nuts

These nuts have good chemical resistance and may be mildly magnetic. They have a molded silicone seal that prevents leaks and seals out contaminants. They meet UL 50 for use on enclosures.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Max. Pressure | Seal Temp. Range, °F | Specifications Met | Each | |
18-8 Stainless Steel | |||||||
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6-32 | 5/16" | 9/64" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 00000 |
8-32 | 3/8" | 5/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
10-24 | 3/8" | 5/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
10-32 | 3/8" | 5/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
1/4"-20 | 7/16" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
1/4"-28 | 7/16" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
5/16"-18 | 1/2" | 17/64" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
5/16"-24 | 1/2" | 17/64" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
3/8"-16 | 9/16" | 21/64" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
3/8"-24 | 9/16" | 21/64" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
7/16"-20 | 11/16" | 3/8" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
1/2"-13 | 3/4" | 27/64" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
1/2"-20 | 3/4" | 27/64" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
5/8"-18 | 15/16" | 35/64" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
Brass Sealing Nuts

These nickel-plated brass sealing nuts have good resistance to chemicals and salt water. A nickel plating provides additional corrosion resistance and a decorative metallic finish. They have a silicone seal that prevents leaks and seals out contaminants. All meet UL 50 for use on enclosures. Nuts are nonmagnetic.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Max. Pressure | Seal Temp. Range, °F | Specifications Met | Each | |
Nickel-Plated Brass | |||||||
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6-32 | 1/2" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 00000 |
8-32 | 1/2" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
10-24 | 1/2" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
10-32 | 1/2" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
1/4"-20 | 5/8" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
1/4"-28 | 5/8" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
3/8"-16 | 5/8" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
3/8"-24 | 5/8" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |
1/2"-20 | 3/4" | 7/32" | 6,000 psi | -100° to 400° | UL 50 | 000000000 | 0000 |