Cartridge Seal

SMSC 1SV ANSI cartridge mechanical seal 1 to 2-7/8 inch SMSC 1SV Large ANSI cartridge mechanical seal 3 to 4 inch – stationary multi-spring SiC/SiC FKM

SMSC 1SV — Single Cartridge Mechanical Seal (ANSI)

Item #N/A

SMSC 1SV — Single Cartridge Mechanical Seal (ANSI)

Our SMSC 1SV cartridge mechanical seal is a single cartridge seal built on an ANSI footprint, assembled in-house using high-quality components sourced domestically and internationally. It’s designed to deliver reliable performance and strong value across demanding industrial services, while staying easy to maintain and simple to stock.

Choose size from dropdown menu above: 1″ to 2-7/8″

At a glance:

Style: Single cartridge, stationary design (excellent for high-speed applications)
Sizes: 1″ to 2-7/8″ (ANSI) (For larger sizes, see our SMSC 1SV Large 3″–4″)
Flush: 1 × 3/8″ NPT flush port standard for enhanced cooling and longer seal life
Axial length: Short inboard length to simplify installation and reduce overhang
Standard materials: Silicon carbide / silicon carbide (SiC/SiC) faces, FKM, 304 stainless steel

Check out Seal House Cartridge Seal Installation Guide for installation guidance.

Why it lasts:

Monolithic seal faces maximize face stability in higher pressure / higher temperature duty to extend service life
Large-area seal-face drive helps minimize face damage in stop/start and viscous services
Slotted anti-rotation gland with a wider rounded slot improves durability under frequent cycling
Hydraulically balanced faces reduce heat generation and power consumption
Non-shaft-fretting sleeve elastomer plus positive set-screw drive protect the shaft and ensure secure torque transmission
Multiple springs provide even face loading with maximum axial movement compensation

Need help sizing or selecting materials? Contact us with your pump model and service details—we’ll spec the best 1SV build for your duty.

Explore our full line up of Shaft Seals

Looking for more? Shop Pump Repair Kits, Gaskets, OEM Seals & more

Weight	4 lbs
Dimensions	12 × 10 × 6 in
Model NO.	SMSC 1SV __
Standard	ANSI, 1”-2-7/8”
Style	Single cartridge mechanical seal, Multi spring with flush
Material	Silicon carbide/Silicon carbide, FKM, 304 stainless steal

SMSC 1SV — Single Cartridge Mechanical Seal (Large 3″–4″)

Item #N/A

SMSC 1SV — Single Cartridge Mechanical Seal (Large 3″–4″)

The SMSC 1SV Large cartridge mechanical seal is our ANSI-style single cartridge seal for big-bore pump services from 3″ to 4″. It’s a stationary, multi-spring cartridge mechanical seal with a standard 3/8″ NPT flush port, built to deliver reliable performance in higher pressure / higher temperature applications and tough industrial duty cycles.

Choose size from dropdown menu above: 3″- 4″

At a glance

Style: Single cartridge mechanical seal, stationary design (excellent for high speed)
Sizes available: 3″, 3-1/4″, 3-1/2″, 3-3/4″, 4″
Flush: 1 × 3/8″ NPT flush port standard (improves cooling and extends seal life)
Materials: Silicon carbide / silicon carbide (SiC/SiC) faces, FKM, 304 stainless steel
Balance/Drive: Hydraulically balanced faces, positive set-screw drive, non-shaft-fretting sleeve elastomer

Check out Seal House Cartridge Seal Installation Guide for installation guidance.

Why it lasts

Monolithic seal faces increase face stability in high-pressure/high-temperature duty
Large-area face drive helps reduce face damage in stop/start and viscous services
Slotted anti-rotation gland improves durability under frequent cycling
Multiple springs provide uniform face loading and strong axial movement compensation

Typical uses

Large-frame ANSI pumps in chemical processing, power, pulp & paper, water/wastewater, mining, and general industrial services—especially where higher pressure/temperature, viscosity, or frequent starts/stops are expected.

Need help selecting the correct size or confirming fit? Contact us with your pump model and service details and we’ll help spec the best 1SV Large build for your application.

Need help sizing or selecting materials? Contact us with your pump model and service details—we’ll spec the best 1SV Large build for your duty.

Explore our full line up of Shaft Seals

Looking for more? Shop Pump Repair Kits, Gaskets, OEM Seals & more

Weight	4 lbs
Dimensions	12 × 10 × 6 in
Model NO.	SMSC 1SV __
Style	Single cartridge mechanical seal, Multi spring with flush
Material	Silicon carbide/Silicon carbide, FKM, 304 stainless steal