We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black compound pressure gauge 4-1/2 inch dial white face glass lens bottom connection

Ashcroft

Ashcroft 451259SD04LV/150# Compound Gauge 30 Hg 150 psi 4-1/2In measurement tool

SKU CH-2NQ6-W4D38

Compound gauge measures vacuum to 30 Hg and pressure to 150 psi with ±0.5% accuracy on a 4½-inch dial

  • Color/FinishBlack
  • TypeElectronic
  • ±0.5 % accuracy for precise process readings
  • 30 Hg to 150 psi compound range covers vacuum and pressure
  • 4 1/2 in dial gives clear, easy-to-read scale
  • PBT case resists chemicals and harsh environments
  • 1/2 in NPT male bottom connection for direct mounting

Ashcroft 4-1/2 inch Process Gauge

The Ashcroft 451259SD04LV/150# is a new process compound gauge built for technicians who need to read both vacuum and positive pressure on a single instrument. Its 4-1/2 inch white dial spans 30 inches of mercury vacuum through 0 to 150 psi with a stated accuracy of plus or minus 0.5 percent. The black polybutylene terephthalate case and glass lens suit industrial and automotive test environments where durability matters.

Fixed Bottom-Mount NPT Connection

The gauge comes with a male 1/2 inch NPT process connection fixed at the bottom of the case, so the installer must provide matching female pipe threads and sufficient clearance for a straight-on installation. No field-fill option, dampening fluid or vibration-resistant movement is included, meaning the unit arrives dry and relies on the rigidity of the piping for stability.

Polybutylene Terephthalate Case With Glass Lens

The black PBT case resists common oils and solvents while the glass lens protects the dial from scratches and chemical splash. Because the case carries no IP or NEMA rating, the gauge should be mounted where it is shielded from direct wash-down or prolonged immersion. The bottom connection orientation keeps the face upright on horizontal pipe runs, simplifying daily reading.

Highlights

  • ±0.5 % accuracy for precise process readings
  • 30 Hg to 150 psi compound range covers vacuum and pressure
  • 4 1/2 in dial gives clear, easy-to-read scale
  • PBT case resists chemicals and harsh environments
  • 1/2 in NPT male bottom connection for direct mounting

Specifications

BrandASHCROFT
Color/FinishBlack
TypeElectronic

Questions about this item

How often will the 4-1/2 inch dial gauge need recalibration given its +/- 0.5 percent accuracy rating?

The gauge maintains its +/- 0.5 percent accuracy under normal use; recalibration intervals depend on your application and any industry standards you follow, not on a fixed schedule from the manufacturer.

Will the polybutylene terephthalate case or glass lens degrade first when the gauge runs continuously at 150 psi?

The PBT case and glass lens are both rated for the full 30 Hg to 150 psi range; neither component has a published service-life limit under sustained pressure, so neither is identified as the first wear point.

Does the bottom-mounted 1/2 inch NPT connection transmit noticeable vibration or heat to the panel during all-day operation?

The gauge has no vibration resistance or dampening feature, so mechanical vibration can transfer through the 1/2 inch NPT male connection; the dry case design means no fluid heating occurs during continuous use.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.