VTN28 Hygienic Design Nut
Technical Drawing & Dimensions
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Part Series d3 t
mind1 h SR R SW VTN28 M4 6 11 9.5 7 25 7 VTN28 M5 6 12 10.5 8 25 8 VTN28 M6 7.5 14 12.22 9 25 10 VTN28 M8 9.5 18 14.5 11 35 13 VTN28 M10 12 21 17.92 13 50 16 VTN28 M12 14.5 25 21 15 50 18 VTN28 M14 15.5 28 23.5 20 70 21 VTN28 M16 17 32 26 26 70 24
Technical Data
| Item | Specification |
|---|---|
| Nut body | AISI 316L stainless steel / EN 1.4404 |
| Certification | 3-A certified |
| Surface finish | Matte or polished, Ra < 0.8 µm |
| HNBR sealing ring | Blue, FDA-compliant material, 85 ±5 Shore A, -25 °C to +150 °C |
| EPDM sealing ring | Blue, FDA-compliant material, 85 ±5 Shore A, -40 °C to +120 °C |
FDA compliance applies to the sealing-ring material, not to the complete nut or installed assembly.
Key Features of Hygienic Design Nuts
· Hygienic geometry designed to eliminate dirt and bacteria accumulation
· Smooth external surfaces for easy cleaning and washdown
· Corrosion-resistant stainless steel construction
· Suitable for CIP (Clean-in-Place) and SIP environments
· High mechanical strength for industrial fastening applications
· Compatible with hygienic bolts and sealing systems
· Optional mirror polished surface for improved cleanability
· Designed for repeated assembly and disassembly
Metal-to-Metal and Seal-Free Options
Through our discussions with pharmaceutical equipment manufacturers, we have found that elastomer seals are unsuitable for some high-temperature sterilization and cleaning processes. However, these applications may still require sealing at the fastening point.
Hygienic nut with a metal-to-metal seal: This option uses a metal-to-metal sealing design and requires the sealing contact surface to be precisely finished to Ra < 0.8 µm.
Hygienic nut without a seal: This option is available for applications where sealing is not required.
Applications
Hygienic stainless steel nuts are widely used in:
· Food processing machinery
· Dairy production systems
· Beverage filling and packaging lines
· Pharmaceutical manufacturing equipment
· Biotech and cleanroom systems
· Industrial washdown and hygiene-critical environments
Frequently Asked Questions
What is the difference between HNBR and EPDM seals?
Based on our market observations, HNBR seals are common in food-processing equipment and EPDM seals in pharmaceutical equipment. For other applications, contact us to confirm the suitable material.