The EPDM Rubber Sealing Washer is a critical sealing component in the Fin Neck Bolt Kit for FRP and steel storage tanks. Positioned between

the bolt head and the tank panel, it creates a watertight seal at every bolt hole — preventing leakage of water, chemicals, liquid fertilizer

and other stored media.

Supplied as part of the complete Fin Neck Bolt Kit, or availableseparately for replacement and maintenance orders.

✓ EPDM / NBR rubber 

— proven sealing performance in water and chemical environments

✓ Resistant to UV, ozone and temperature extremes (-40°C ~ +80°C)

✓ Available in Black and White

✓ Compatible with 1/2" UNC and M12 / M16 fin neck bolt systems

✓ Unit weight only 0.15 kg per 1,000 pcs

— lightweight, easy to handle in bulk

【Why the Sealing Washer Matters】

✓ Creates a watertight seal at every bolt hole 

— prevents tank leakage

✓ Compensates for minor surface irregularities in FRP and steel panels

✓ Absorbs vibration and thermal expansion 

— reduces bolt loosening over time

✓ EPDM grade suitable for potable water, wastewater and chemical storage

✓ NBR grade available for oil and fuel storage tank applications

【Applicable Tank Types】

✓ FRP water storage tanks 

— primary sealing at every panel joint bolt

✓ Grain silos 

— prevents moisture ingress through bolt holes

✓ Petrochemical storage tanks 

— NBR grade for oil and chemical resistance

✓ Liquid fertilizer tanks 

— EPDM grade compatible with fertilizer media

✓ Biogas digesters 

— gas-tight sealing at panel connections

Ordering Information:

Rubber Sealing Washers are available:

→ As part of the complete Fin Neck Bolt Kit (recommended)

→ Separately in bulk for maintenance and replacement orders

Minimum order and pricing on request.

Response within 24 hours. In-stock items ship within 1 week.

To enquire, please provide:

- Required quantity

- Material preference (EPDM for water/chemical tanks, NBR for oil tanks)

- Color preference (Black or White)

- Compatible bolt size (1/2" UNC or M12/M16)

→ [Contact Us for Pricing]

Related Products:

• 1/2" UNC Fin Neck Bolt Kit

  — complete 5-piece kit including Rubber Washer

• M12 / M16 Fin Neck Bolt Kit

  — metric complete kit including Rubber Washer

• Plastic Cap

  — PA66 protective cap for bolt and nut end

• Steel Washer

  — load distribution washer for panel assembly

• Hex Nut

  — compatible heavy hex nut for tank bolt systems

Related Pages:

• Quality & Testing 

  — in-house laboratory and test standards

• Quality Certificate

  — ISO 9001:2015 certification

• Contact Us

  — quote and sample request within 24 hours