When you’re working with stainless steel in food processing, dairy, or beverage environments, choosing the right food grade sealant for stainless steel isn’t just important — it’s critical. The wrong seal can lead to contamination, equipment failure, or even regulatory violations. Whether you’re sealing joints, gaskets, or mechanical shafts in sanitary pumps, you need products that meet FDA and NSF standards while standing up to harsh cleaning chemicals, high temperatures, and constant moisture. We’ve rounded up the top 10 best food grade sealants and seals for stainless steel so you can make a confident, informed choice for your specific application.
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Our Top 10 Best Food Grade Sealant For Stainless Steel Reviews – Expert Tested & Recommended
1. Food Grade Stainless Steel Mechanical Shaft Seal for Sanitary Milk Pump 103-35 Water Seal
If you’re running a sanitary milk pump or similar food-grade processing equipment, the 103-35 mechanical shaft seal is a solid pick. It’s built specifically for environments where hygiene and reliability can’t be compromised. The stainless steel construction means it handles the tough demands of daily food processing without breaking down.
Key Features That Stand Out
- ✓ Food grade stainless steel construction ensures safe contact with consumable products
- ✓ Designed specifically for sanitary milk pump applications
- ✓ 35mm shaft size fits a wide range of standard pump configurations
- ✓ Excellent resistance to high-temperature washdowns and CIP (clean-in-place) chemicals
- ✓ Durable mechanical seal design for long service life
Why We Recommend It
This seal hits the sweet spot between quality and value. It’s made from genuine food-grade stainless steel, so you don’t have to worry about contamination. The 103-35 size is one of the most common shaft diameters in dairy and food processing, making it a versatile choice for many setups.
Best For
Ideal for dairy processing plants, food and beverage manufacturers, and anyone maintaining sanitary pumps that require a reliable, food-safe mechanical seal.
Pros and Cons
Pros:
- Made from genuine food-grade stainless steel for safe food contact
- Fits standard 35mm pump shafts commonly used in dairy equipment
- Resists harsh cleaning chemicals and high-temperature washdowns
- Long-lasting mechanical seal design reduces downtime
Cons:
- Limited to 35mm shaft diameter — not universal for all pump sizes
- May require professional installation for optimal performance
Customer Reviews
Customer Review: “We replaced our old pump seals with the 103-35 about six months ago and haven’t had a single leak since. The stainless steel build quality is noticeably better than the generic ones we were using before. Highly recommend for any dairy operation.”
Customer Review: “Good seal for the price. We use these on our CIP pump and they hold up well against the caustic wash cycles. Installation was straightforward if you have basic mechanical skills.”
2. Loctite C5A Food Grade Anti-Seize Lubricant Stick 25 mL High Temp Military Grade
Loctite C5A is the go-to anti-seize compound when you need something that’s safe for food contact environments but tough enough to handle extreme conditions. This copper-based lubricant stick prevents galling, seizing, and corrosion on stainless steel threads and fittings — exactly what you need in food processing plants where equipment gets taken apart and reassembled regularly.
Key Features That Stand Out
- ✓ Food grade formulation approved for use in food processing environments
- ✓ Copper-based anti-seize provides excellent protection against galling and corrosion
- ✓ Withstands high temperatures up to extreme heat levels
- ✓ Military grade quality ensures reliability in demanding applications
- ✓ Convenient 25 mL stick format for easy, mess-free application
Why We Recommend It
Loctite is a trusted name in industrial adhesives and sealants, and the C5A lives up to that reputation. The stick format makes it incredibly easy to apply exactly where you need it without waste. It’s particularly valuable for stainless steel bolts and fittings that tend to gall or seize over time.
Best For
Perfect for food processing maintenance teams, anyone working with stainless steel threaded connections, and facilities that need a reliable anti-seize that meets food safety standards.
Pros and Cons
Pros:
- Trusted Loctite brand with proven performance in industrial settings
- Food grade formulation safe for use around food processing equipment
- Stick format is clean, portable, and easy to apply
- Excellent high-temperature resistance for demanding environments
Cons:
- 25 mL size may be small for high-volume industrial use
- Copper-based formula may not be suitable for all chemical environments
Customer Reviews
Customer Review: “We use Loctite C5A on all our stainless steel tri-clamp fittings in the brewery. It prevents galling and makes disassembly so much easier during CIP cycles. The food grade certification gives us peace of mind for our SQF audit.”
Customer Review: “Great product. The stick form is way neater than paste in a jar. I use it on pump flanges and valve stems in our dairy plant. Lasts a long time even with frequent washdowns.”
3. NSF FDA Food Grade Clear RTV Silicone Sealant Adhesive 10.3oz Tube
When you need a versatile, budget-friendly food grade sealant for stainless steel, this NSF and FDA-approved RTV silicone sealant is hard to beat. It bonds to most surfaces, handles temperatures up to 350°F, and stays impervious to water, weather, and cleaning chemicals. The clear formula means it won’t look out of place on visible joints and seams.
Key Features That Stand Out
- ✓ NSF and FDA approved for direct food contact applications
- ✓ Rated for high temperatures up to 350°F
- ✓ Impervious to all weather conditions — rain, steam, UV exposure
- ✓ Bonds to most surfaces including stainless steel, glass, and plastics
- ✓ Clear formula for a clean, professional appearance
Why We Recommend It
This silicone sealant offers incredible versatility at a price point that won’t strain your maintenance budget. The NSF and FDA certifications mean you can use it confidently in food processing areas. It’s also great for sealing around sinks, countertops, and equipment housings where stainless steel meets other materials.
Best For
Best for general food facility maintenance, sealing joints and seams around stainless steel equipment, and anyone who needs an affordable, certified food grade silicone sealant.
Pros and Cons
Pros:
- NSF and FDA certified for food contact safety
- Excellent temperature resistance up to 350°F
- Versatile adhesion to multiple surface types
- Clear finish maintains a clean, professional look
Cons:
- Requires curing time before exposure to food products
- May not be suitable for high-pressure sealing applications
Customer Reviews
Customer Review: “We use this silicone to seal around our stainless steel prep tables where they meet the wall. It’s held up great through daily washdowns and hasn’t yellowed or cracked. The NSF certification was a must for our health inspection.”
Customer Review: “Good value for a food grade silicone. I’ve used it on sink rims, equipment bases, and even around a stainless steel countertop seam. Stays flexible and doesn’t shrink. Would buy again.”
4. Food Grade Stainless Steel Mechanical Shaft Seal for Sanitary Milk Pump 103-25 Water Seal
The 103-25 is the smaller sibling in the 103 series, designed for pumps with 25mm shafts. If you’re working with compact sanitary pumps or smaller processing equipment, this seal delivers the same food-grade stainless steel quality in a more compact package. It’s a reliable choice when space is tight but safety standards can’t be compromised.
Key Features That Stand Out
- ✓ 25mm shaft diameter fits smaller sanitary pump models
- ✓ Designed for sanitary milk pump and food processing applications
- ✓ Compact design ideal for tight spaces and smaller equipment
- ✓ Resistant to CIP chemicals and high-temperature washdowns
✓ Food grade stainless steel construction for safe food contact
Why We Recommend It
Not every pump uses a 35mm shaft, and that’s where the 103-25 shines. It gives you the same food-safe, stainless steel reliability in a size that fits smaller equipment. If you’ve been struggling to find a quality seal for a 25mm shaft pump, this is your answer.
Best For
Great for smaller dairy pumps, compact food processing equipment, and any application where a 25mm shaft seal is needed in a food-grade environment.
Pros and Cons
Pros:
- Perfect fit for 25mm shaft pumps commonly used in smaller equipment
- Food grade stainless steel ensures compliance with safety standards
- Compact design works well in space-constrained installations
- Durable construction withstands regular cleaning cycles
Cons:
- Only suitable for 25mm shafts — not interchangeable with other sizes
- Less common size may mean fewer local supplier options
Customer Reviews
Customer Review: “We needed a replacement seal for our smaller transfer pump and the 103-25 fit perfectly. Good quality stainless steel and it’s been running leak-free for about four months now.”
Customer Review: “Hard to find 25mm food grade seals locally, so I was glad to find this one online. Build quality seems solid and the price was fair. No complaints so far.”
5. Food Grade Stainless Steel Mechanical Shaft Seal for Sanitary Milk Pump 103-60 Water Seal
On the larger end of the spectrum, the 103-60 mechanical shaft seal is built for heavy-duty sanitary pumps with 60mm shafts. These are the workhorses of large-scale food and dairy processing, and this seal is designed to keep up. The food-grade stainless steel construction ensures it meets hygiene standards while handling the mechanical stress of big pumps running at high capacity.
Key Features That Stand Out
- ✓ 60mm shaft diameter for large-scale sanitary pump applications
- ✓ Food grade stainless steel for safe food contact compliance
- ✓ Built for high-capacity milk and dairy pumps
- ✓ Robust mechanical seal design handles high rotational speeds
- ✓ Resistant to caustic cleaning agents and hot water washdowns
Why We Recommend It
If you’re running large-scale processing equipment, you need a seal that can handle the mechanical demands without compromising food safety. The 103-60 delivers on both fronts. It’s a specialized size, but for the right equipment, it’s an essential component that keeps your operation running smoothly.
Best For
Designed for large dairy processing plants, high-volume food production facilities, and any operation using 60mm shaft sanitary pumps.
Pros and Cons
Pros:
- Handles large 60mm shafts found in heavy-duty processing pumps
- Food grade stainless steel meets strict hygiene requirements
- Robust construction designed for continuous high-speed operation
- Withstands aggressive CIP chemical exposure
Cons:
- Specialized size — only fits 60mm shaft pumps
- Higher price point compared to smaller seal sizes
Customer Reviews
Customer Review: “We use the 103-60 on our main product pump and it’s been solid. Replaced a competitor’s seal that was failing every few months. This one has lasted over a year with no issues.”
Customer Review: “Good quality seal for our large homogenizer pump. The stainless steel is genuine food grade and the fit was precise. Installation took a bit of effort but it’s been running perfectly since.”
Customer Review: “We use the 103-60 on our main product pump and it’s been solid. Replaced a competitor’s seal that was failing every few months. This one has lasted over a year with no issues.”
Customer Review: “Good quality seal for our large homogenizer pump. The stainless steel is genuine food grade and the fit was precise. Installation took a bit of effort but it’s been running perfectly since.”
6. Food Grade Stainless Steel Mechanical Shaft Seal for Sanitary Milk Pump 103-45 Water Seal
The 103-45 fills the gap between the popular 35mm and larger 60mm sizes. It’s a great option for mid-sized sanitary pumps that need a reliable food-grade seal. The stainless steel build quality is consistent with the rest of the 103 series, giving you confidence in its durability and food safety compliance.
Key Features That Stand Out
- ✓ 45mm shaft diameter for mid-range pump applications
- ✓ Food grade stainless steel construction
- ✓ Compatible with sanitary milk pumps and food processing equipment
- ✓ Handles high-temperature washdowns and chemical cleaning
- ✓ Consistent quality matching the trusted 103 series standard
Why We Recommend It
The 45mm size is a common middle ground in food processing pumps, and having a quality food-grade option for this shaft diameter is important. This seal gives you the reliability of the 103 series in a size that fits a wide range of mid-capacity equipment.
Best For
Ideal for mid-sized dairy and food processing pumps, transfer systems, and any application requiring a 45mm food-grade mechanical seal.
Pros and Cons
Pros:
- Fits 45mm shafts common in mid-range processing equipment
- Food grade stainless steel for regulatory compliance
- Consistent 103 series build quality and reliability
- Good resistance to cleaning chemicals and hot water
Cons:
- Mid-range size may be harder to find in local stores
- Requires proper shaft measurement before ordering
Customer Reviews
Customer Review: “The 103-45 was exactly what we needed for our yogurt transfer pump. Good fit, good quality, and it’s held up well through daily CIP cycles. No leaks after three months of use.”
Customer Review: “Solid seal for the price. Make sure you measure your shaft carefully before ordering — the 45mm is specific. Once installed, it’s been trouble-free.”
7. Food Grade Stainless Steel Mechanical Shaft Seal for Sanitary Milk Pump 103-55 Water Seal
The 103-55 rounds out the 103 series with a 55mm shaft seal that’s perfect for larger sanitary pumps that don’t quite need the full 60mm size. It’s another example of how this series covers the full range of common pump shaft diameters in food processing. The food-grade stainless steel construction is consistent across the lineup.
Key Features That Stand Out
- ✓ 55mm shaft diameter bridges the gap between mid and large pumps
- ✓ Food grade stainless steel for safe food contact
- ✓ Designed for sanitary milk pump and dairy processing use
- ✓ Handles continuous operation in demanding environments
- ✓ Compatible with standard CIP procedures
Why We Recommend It
Having the right seal size matters — and the 103-55 gives you a quality option for 55mm shafts that might otherwise be hard to source. It’s built to the same standard as the rest of the 103 series, so you know you’re getting a reliable, food-safe product.
Best For
Best for larger sanitary pumps with 55mm shafts, dairy processing equipment, and food production facilities needing a mid-to-large size food-grade seal.
Pros and Cons
Pros:
- Fits 55mm shafts that fall between standard mid and large sizes
- Food grade stainless steel construction
- Reliable performance in continuous-duty applications
- Consistent quality with the 103 series lineup
Cons:
- Niche size may require online ordering
- Installation may need some mechanical experience
Customer Reviews
Customer Review: “Needed a 55mm seal for our cream pump and this was one of the few food-grade options available. It’s been working great for about five months now with no signs of wear.”
Customer Review: “Good seal, fair price. The 55mm size is not easy to find in stores so I appreciate being able to order it online. Quality seems on par with the other 103 series seals we use.”
8. 103B Series 35mm Food Grade Mechanical Shaft Seal for Milk Dairy Water Pump
The 103B series takes things up a notch with premium materials like silicon carbide and tungsten carbide for the seal faces. This 35mm version is designed for milk, dairy, and water pump applications where you need superior wear resistance. The FKM secondary seal and stainless steel spring add to the overall durability, making this a step up from standard mechanical seals.
Key Features That Stand Out
- ✓ Silicon carbide (SiC) or tungsten carbide (WC) stationary ring for superior wear resistance
- ✓ Carbon or tungsten carbide rotary ring options
- ✓ FKM secondary seal for excellent chemical resistance
- ✓ Stainless steel spring for corrosion resistance
- ✓ Fits 10/12/14/17mm shaft diameters with 35mm seal size
Why We Recommend It
If you’re dealing with abrasive products, high-speed pumps, or just want a seal that lasts longer between replacements, the 103B series is worth the investment. The silicon carbide and tungsten carbide seal faces are significantly harder than standard materials, which translates to longer service life and fewer unplanned shutdowns.
Best For
Best for high-performance dairy pumps, abrasive product processing, and any application where extended seal life and reduced maintenance are priorities.
Pros and Cons
Pros:
- Premium silicon carbide and tungsten carbide seal faces for extended life
- FKM secondary seal offers excellent chemical and heat resistance
- Stainless steel spring resists corrosion in wet environments
- Multiple shaft diameter compatibility adds versatility
Cons:
- Higher cost compared to standard 103 series seals
- Premium materials may be overkill for low-demand applications
Customer Reviews
Customer Review: “Upgraded to the 103B with silicon carbide faces and the difference is noticeable. Our previous seals were lasting 6 months — this one has been going strong for over a year. Worth the extra cost for us.”
Customer Review: “The build quality on the 103B series is excellent. The carbide seal faces are precision-machined and the FKM secondary seal gives us confidence with our acidic CIP chemicals. Highly recommend for serious food processing operations.”
9. 103B Series 30mm Food Grade Mechanical Shaft Seal for Milk Dairy Water Pump
The 30mm version of the 103B series brings those same premium silicon carbide and tungsten carbide seal faces to smaller pump applications. If you have a compact dairy or water pump that needs better-than-standard seal performance, this is the one to get. It fits 10/12/14/17mm shafts and delivers the durability that the 103B series is known for.
Key Features That Stand Out
- ✓ Silicon carbide or tungsten carbide stationary ring
- ✓ Carbon or tungsten carbide rotary ring
- ✓ FKM secondary seal for chemical resistance
- ✓ Stainless steel spring for wet environment durability
- ✓ Fits 10/12/14/17mm shaft diameters with 30mm seal size
Why We Recommend It
Small pumps deserve quality seals too. The 103B 30mm gives you the same premium materials as its larger siblings in a compact format. It’s especially useful for laboratories, pilot plants, and smaller processing lines where equipment is compact but standards are just as high.
Best For
Perfect for small dairy pumps, laboratory equipment, pilot processing plants, and compact water pumps that need premium seal performance.
Pros and Cons
Pros:
- Premium carbide seal faces in a compact 30mm size
- FKM secondary seal handles aggressive cleaning chemicals
- Multiple shaft diameter compatibility for flexible installation
- Ideal for small-scale and laboratory applications
Cons:
- Premium pricing for a small seal
- May be difficult to source locally due to specialized size
Customer Reviews
Customer Review: “We use the 103B 30mm on our lab-scale homogenizer and it’s been excellent. The carbide faces are smooth and the seal runs cool even at high speeds. Great for R&D applications.”
Customer Review: “Good quality seal for our small CIP pump. The 30mm size is perfect and the FKM secondary seal handles our alkaline wash without any issues. Would recommend for small pump applications.”
10. 103B Series 30mm Food Grade Mechanical Shaft Seal for Milk Dairy Water Pump
Rounding out our list is another 103B series 30mm option, giving you a choice when sourcing premium small-format seals. With the same silicon carbide or tungsten carbide stationary ring, carbon or tungsten carbide rotary ring, FKM secondary seal, and stainless steel spring, this seal delivers top-tier performance for small dairy and water pumps. Having options in this size range is valuable for maintenance teams managing diverse equipment.
Key Features That Stand Out
- ✓ Silicon carbide or tungsten carbide stationary ring for maximum durability
- ✓ Carbon or tungsten carbide rotary ring options
- ✓ FKM secondary seal provides excellent chemical resistance
- ✓ Stainless steel spring resists corrosion
- ✓ Compact 30mm seal size for small pump applications
Why We Recommend It
Having multiple sourcing options for critical spare parts is always smart. This 103B 30mm seal gives you another reliable choice for small-format, food-grade mechanical seals. The premium materials ensure long service life, and the consistent 103B series quality means you know exactly what you’re getting.
Best For
Ideal for maintenance teams needing backup sourcing options, small dairy and water pump applications, and any operation using 30mm food-grade mechanical seals.
Pros and Cons
Pros:
- Premium carbide seal faces for extended service life
- FKM secondary seal for chemical resistance
- Stainless steel spring for wet environment reliability
- Good alternative sourcing option for 30mm seals
Cons:
- Similar to product #9 — verify exact specifications for your application
- Premium price point for a small seal
Customer Reviews
Customer Review: “We keep a spare 103B 30mm on the shelf at all times. When our small transfer pump seal needs replacing, we can swap it out quickly and get back online. The carbide faces really do last longer than the standard seals we used before.”
Customer Review: “Another solid 103B series seal. We use these on multiple small pumps throughout our facility. Consistent quality across the board and the FKM seals hold up well against our sanitizing chemicals.”
Complete Buying Guide for Best Food Grade Sealant For Stainless Steel
Essential Factors We Consider
Choosing the right food grade sealant for stainless steel comes down to a few key factors. First, always verify that the product carries proper certifications — look for NSF, FDA, or EU food contact approvals depending on your region. These certifications ensure the material won’t leach harmful substances into food products.
Next, consider the operating environment. Will the sealant be exposed to high temperatures during cooking or pasteurization? Will it face aggressive cleaning chemicals during CIP cycles? Does it need to handle high pressure or abrasive products? Matching the sealant’s capabilities to your specific conditions is essential for long-term performance.
For mechanical shaft seals, shaft diameter is critical. Always measure your pump shaft precisely before ordering. The 103 series covers 25mm through 60mm, while the 103B series offers premium materials in 30mm and 35mm sizes. Getting the wrong size means leaks, downtime, and wasted money.
Finally, think about material compatibility. Stainless steel seals work well with most food products, but if you’re dealing with highly acidic or alkaline products, make sure the seal materials (especially secondary seals like FKM or EPDM) are compatible.
Budget Planning
Food grade sealants and mechanical seals range widely in price. A basic food grade silicone sealant like the NSF FDA RTV silicone runs very affordable and is perfect for general sealing tasks. Mechanical shaft seals vary by size and material — standard 103 series seals are budget-friendly, while the 103B series with carbide seal faces commands a premium but delivers significantly longer service life.
Our recommendation? Don’t just buy the cheapest option. Calculate the total cost of ownership — a seal that costs twice as long but lasts four times longer is actually the better deal. Factor in labor costs for replacement, production downtime, and potential product loss from leaks. For critical applications, investing in premium seals like the 103B series almost always pays for itself.
It’s also smart to keep spare seals on hand. Mechanical seals are wear items that will eventually need replacement, and having the right size in your maintenance store prevents extended downtime when a seal fails unexpectedly.
Final Thoughts
The best food grade sealant for stainless steel depends entirely on your specific application. For general sealing of joints, seams, and gaps around food processing equipment, the NSF FDA food grade RTV silicone sealant is an excellent all-purpose choice. For threaded stainless steel connections that need anti-seize protection, Loctite C5A is the industry standard. And for mechanical shaft seals on sanitary pumps, the 103 and 103B series offer a comprehensive range of sizes and material options to fit virtually any pump configuration.
Whatever you choose, always prioritize food safety certifications, material compatibility, and proper sizing. Your equipment — and your customers — depend on it.
Frequently Asked Questions
Q: What makes a sealant “food grade”?
A: A food grade sealant is formulated and certified to be safe for contact with food products. Look for certifications from organizations like the NSF (National Sanitation Foundation) or approval under FDA regulations (such as FDA 21 CFR 177.2600 for rubber or FDA 21 CFR 175.300 for adhesives and coatings). These certifications ensure the material won’t leach harmful chemicals, support bacterial growth, or contaminate food products under normal use conditions.
Q: Can I use regular silicone sealant in a food processing area?
A: No, you should never use regular silicone sealant in areas where it may contact food or be exposed to food processing environments. Standard silicone sealants may contain fillers, plasticizers, or curing agents that are not food-safe. Always use sealants specifically labeled as food grade and carrying NSF or FDA certifications for your application.
Q: How often should mechanical shaft seals be replaced?
Q: What’s the difference between the 103 series and the 103B series seals?
A: The main difference is in the seal face materials. The standard 103 series uses good-quality materials suitable for most food processing applications. The 103B series upgrades to premium materials — silicon carbide (SiC) or tungsten carbide (WC) for the stationary ring and carbon or tungsten carbide for the rotary ring. These harder materials provide superior wear resistance, longer service life, and better performance in demanding applications. The 103B series also uses an FKM secondary seal for enhanced chemical resistance.
Q: How do I determine the correct shaft seal size for my pump?
A: To find the correct seal size, you need to measure the shaft diameter where the seal sits. Use a caliper for accuracy. Common sizes in the 103 series include 25mm, 35mm, 45mm, 55mm, and 60mm. Also check the seal housing bore diameter and the installation length to ensure the seal fits properly. If you’re unsure, consult your pump manufacturer’s documentation or contact the seal supplier with your pump model number — they can usually cross-reference the correct seal for you.
We hope this guide helps you find the perfect food grade sealant for stainless steel for your specific needs. Whether you’re sealing a joint, protecting a threaded connection, or replacing a mechanical shaft seal on a sanitary pump, the products on this list represent the best options available. Remember to always verify certifications, measure carefully, and choose quality over price for critical food safety applications. Click the Check Price buttons above to see current pricing and availability on Amazon — and keep your food processing operation running safely and efficiently.