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Aluminium threaded flange with four bolt holes

Zoro Select

Zoro Select Flange Aluminum Threaded 3 7/8 in 453

SKU CH-5R37-SJTZV

Aluminium flange with ¾ inch NPT threads, 3 7/8 inch diameter and four bolt holes rated to 125 psi at 72 °F

  • Aluminium construction resists corrosion for longer service life
  • 6063 alloy provides strength with light weight for easier handling
  • Class 125 rating supports 125 psi at 72 °F for reliable water-line performance
  • Four bolt holes on a 2 3/4 in circle simplify alignment during installation
  • Threaded FNPT connection fits Schedule 40 pipe without welding

Industrial Flange for Schedule 40 Piping

This Zoro Select aluminum flange connects to 3/4 inch nominal pipe with female NPT threads. The 6063 alloy body meets Class 125 specifications for standard industrial plumbing. Four bolt holes on a 2 3/4 inch circle secure the joint in water, air or steam lines.

Threaded Connection and Bolt Pattern

The flanged-by-FNPT design lets you join threaded pipe directly to a flat mating surface without welding. A 7/16 inch thickness and 5/8 inch bolt holes accept standard hardware for a leak-tight seal. The 3 7/8 inch outside diameter matches common Schedule 40 flange dimensions.

Pressure and Temperature Headroom

Rated for 125 psi at 72 degrees F and 185 psi maximum steam pressure, the fitting handles typical low-pressure process lines. Operating range spans 0 to 270 degrees F, so it suits chilled water, hot water and saturated steam. Not suited for high-pressure hydraulic systems or cryogenic service.

How it compares

Measured against everything we stock in Garden Hoses & Pipe Tubing, at today’s prices. Recalculated every night.

Price $27.99
Pricier than about 61% of the 973 comparable items (median $21.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

Will the 6063 aluminum flange need replacement due to corrosion under normal water service?

The 6063 aluminum construction resists corrosion in typical plumbing environments; lifespan depends on water chemistry and operating conditions rather than a fixed schedule.

What pressure limit is reached first when the system runs continuously at elevated temperature?

The 125 psi maximum operating pressure at 72°F is the primary limit; it decreases as temperature rises toward the 270°F maximum.

How much heat does the flange radiate during all-day operation near its 270°F rating?

Aluminum conducts heat efficiently, so the flange surface will approach the fluid temperature; insulation is recommended for personnel protection at high temperatures.

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