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
Ashcroft 4 1/2 inch black phenolic vacuum gauge with white dial and glass lens

Ashcroft

Ashcroft 451279 Process Vacuum Gauge 30 Hg 4 1/2 in

SKU CH-2K2J-3WNWQ

Measures vacuum to 30 Hg with ±0.5 % accuracy on a 4 1/2 in phenolic case

  • Color/FinishBlack
  • TypeElectronic
  • +/- 0.5 % accuracy for reliable vacuum readings
  • 4 1/2 in dial gives clear, easy-to-read scale
  • 30 Hg range covers full vacuum measurement needs
  • 1/2 in NPT male connection fits standard process piping
  • Phenolic case with glass lens resists harsh environments

Ashcroft 451279 Process Vacuum Gauge

The Ashcroft 451279 is a process vacuum gauge designed for measuring negative pressure in industrial and laboratory settings. It features a 4 1/2 inch nominal dial size with a white face and black phenolic case. The unit offers an accuracy of +/- 0.5 percent across its range.

30 to 0 Hg Measurement Range

This gauge covers a primary pressure range of 30 to 0 Hg, providing clear vacuum readings for evacuation and process monitoring tasks. The 1/2 inch male NPT bottom connection allows direct installation into standard piping. It is not field fillable and lacks vibration dampening features.

Dry Operation With Glass Lens

The instrument operates as a dry gauge without liquid dampening, relying on a glass lens for durability and readability. Its phenolic case carries no IP or NEMA rating, limiting use to protected indoor environments. The bolt circle diameter measures 5.375 inches for panel mounting options.

Highlights

  • +/- 0.5 % accuracy for reliable vacuum readings
  • 4 1/2 in dial gives clear, easy-to-read scale
  • 30 Hg range covers full vacuum measurement needs
  • 1/2 in NPT male connection fits standard process piping
  • Phenolic case with glass lens resists harsh environments

Specifications

BrandASHCROFT
Color/FinishBlack
TypeElectronic

Questions about this item

Will the 1/2 in NPT bottom connection on the Ashcroft 451279 fit my existing pipework without adapters?

The gauge has a 1/2 in male NPT bottom connection; if your pipework uses the same thread it will mate directly, otherwise a suitable adapter is required.

How can I verify the +/- 0.5 percent accuracy of the 30 to 0 Hg range after installation?

Apply a calibrated vacuum source at several points across the 30 to 0 Hg scale and confirm the pointer reads within half a percent of full scale at each point.

Does the phenolic case with glass lens and 5.375 in bolt circle come complete, or must I buy mounting hardware separately?

The gauge includes the case, glass lens and dial; bolts or a mounting bracket for the 5.375 in bolt circle are not included and must be sourced separately.

Also in this aisle

People compared these

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