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Hammond Manufacturing HP350 Conduit Seal Plug

The HP350 hole plug is designed for sealing unused conduit openings and knockout holes against dust, oil, and water. Available in steel and stainless steel, it fits 3.5-inch conduit and features an oil-resistant gasket for enhanced protection. The steel version is finished in gray, secured with a threaded stud and plated wing nut, while the stainless steel model has a brushed finish, also with a threaded stud and wing nut. These reliable plugs are suitable for industrial applications requiring durable and waterproof sealing solutions.

Authorized Distributors
Source:Newark
Part No:HP350
Stock:246
Inv Date:06-11-2026
Price: Unit price: $42.87
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Source:DigiKey
Part No:HP350
Stock:1
Inv Date:06-11-2026
Price: Unit price: $41.62
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Part No:HP350
Stock:1
Inv Date:06-12-2026
Price: Unit price: $41.62
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Part No:HP350
Stock:0
Inv Date:06-11-2026
Price: Unit price: $41.28
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Part No:HP350
Stock:0
Inv Date:06-11-2026
Price: Unit price: $44.97
Buy/RFQ:
Part No:HP350
Stock:0
Inv Date:06-11-2026
Price: Unit price: $44.97
Buy/RFQ:
Part No:HP350
Stock:162
Inv Date:06-11-2026
Price: Unit price: $32.94
Buy/RFQ:

Hammond Manufacturing HP350 Conduit Seal Plug Specifications:

  • Material: Steel, brushed stainless steel finish
  • Diameter: 4.12 inches (104.6 mm)
  • Max Hole Diameter: 4.62 inches (117.35 mm)
  • Secured with threaded stud size: 10-24 x 0.55 inches
  • Gasket: Oil resistant
  • Finish: Gray in steel, brushed in stainless steel
  • Application: Sealing conduit openings and knockout holes
  • Available sizes: Steel in 12 sizes, stainless steel in 8 sizes
  • Compatible with conduit or pushbutton openings
  • Designed for industrial sealing applications

Buy the Hammond 350 U+2013 Reliable Conduit Seal Plug for Industrial Applications

Secure reliable sealing for unused conduit openings with the Hammond HP350 conduit seal plug. Crafted from durable steel or stainless steel, it features an oil-resistant gasket and a threaded stud with wing nut for easy installation. Designed for 3.5-inch conduit, it effectively prevents dust, water, and oil ingress in industrial environments. Available in multiple sizes, this sealing solution ensures long-lasting protection for electrical and conduit systems. Order online today for superior performance and peace of mind in demanding settings.

Buy Hammond HP350 now and experience unmatched reliability and performance in industrial sealing solutions.

Frequently Asked Questions

Where can I buy Hammond Manufacturing HP350?

You can click on the BUY or RFQ button to purchase HP350 from an authorized Hammond Manufacturing distributor.

How do I troubleshoot issues or seek technical support for part HP350?

You can download the HP350 datasheet or visit the Hammond Manufacturing website for support.

Who is the manufacturer of HP350?

Hammond Manufacturing

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