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343 MP35N Lee Plug®

This member of our classic Lee Plug® family is made from MP35N, a NACE-compliant nickel-cobalt alloy that provides excellent corrosion resistance for harsh-duty applications found in the oil and gas industry. Lee plugs continue to be the simplest, most successful method for sealing cross-drilled holes. Upon installation of the pin, controlled expansion causes the lands and grooves of the plug to “bite” into the surrounding material, forming independent seals and retaining rings. Sizes range from 0.093 to 0.343 inches.

Key Product Facts
  • Plug Diameter:0.343 inches
  • Max. Sealable Passageway Diameter:0.312 inches
  • Proof Pressure:30,000 psi
  • Plug Material:MP35N
  • Housing Material:Inconel, MP35N, or Stainless Steel

Product Information

General Performance

30,000 psi Proof Pressure

Pin MP35N Chemistry per AMS 5844 and heat treat per NACE MR0175 Wax
Plug MP35N Chemistry per AMS 5844 and heat treat per NACE MR0175 -
Electrical Operation

For dimensions, please refer to the Part Numbers & Specifications tab.

Part Numbers & Specifications

This table below contains the part numbers and technical specifications for this product. If you have specific questions, need a quote, or would like to request a handbook or drawing, click the red request button in the column on the far right.

Image Specifications
Dimensional View
Installation Hole Details
Part Numbers & Specifications
Part Number Size D Max. D Min. C Nom. M Nom. K Nom. L Nom. A Min. N Dia. Ref. W Min. Ream Dia. Request Information
PLGA3431350A Long 0.3437 0.3428 0.5 0.41 0.309 0.334 0.437 0.312 0.06 0.3437-0.3442 Request
All dimensions are in inches. This information is for reference only.

Installation & Accessories

Replacement Parts & Accessories
Part Number Description
CUTA34320203A Installation Tool Set
CUTA3430113B Extraction Tool Set
CUTA3431103A Gauge

CAD Envelopes

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From plugs to solenoid valves, there’s a vast array of products that The Lee Company can offer. If you’d like to discuss the best solution for your specific application or to learn more about our capabilities, use-cases, or quality standards, contact your local Lee sales engineer.