An Anvil International Company

Product Overview

Our constant supports are the industry standard, providing reliable service for both big and small projects.

The exclusive geometric design of Anvil Model R Constant Support Hanger assures perfectly constant support through the entire deflection of the pipe load. This counter-balancing of the load and spring moments about the main pivot is obtained by the use of carefully designed compression type load springs, lever, and spring tension rods.

Finish: Standard finish; painted with semi gloss primer. Corrosion resistant; galvanized with coated coil or painted with CZ11 and coated coil.

Recommended Service: When piping stress is critical and pipe is subject to vertical movement in excess of 1⁄2" due to thermal expansion, and also at locations where it is necessary to avoid any transfer of stress from support or onto critical terminals or connecting equipment.

Approvals: WW-H-171E (Types 52, 58 and 59), ANSI/MSS SP-69 and MSS SP-58 (Types 54, 55 and 56).


  • Because of exclusive geometric design, mathematically perfect constancy of support is maintained throughout the full range of load adjustment.
  • Compactness – design provides smaller and more versatile units.
  • Increased load and travel capacity.
  • Each hanger is individually calibrated before shipment to support the exact load specified.
  • All model R constant supports have a wide range of load adjustability. No less than 10% of this adjustability is provided either side of the calibrated load.
  • White button marked “C” denotes cold setting of hanger; red button marked “H” denotes hot or operating setting.
  • Field load adjustment is made by turning the single load adjustment bolt.
  • Covered spring provides protection and good appearance.
  • J-rod swings at least 4° from vertical.
  • Non-resonant to all vertical vibrations.

Size Range: Anvil Model R constant support hangers are made in two basic designs, 80- V (vertical design) and 81-H (horizontal design). Combined, the 80-V and 81-H constant supports are made in nine different frame sizes and 110 spring sizes to accommodate travels from 1 1⁄2" to 20" and loads from 27 lbs to 87,500 lbs.

Specification Sheets

Constant Support Installation Instructions Constant Support Installation Instructions (9 MB)

Constant Support Sizing Tutorial Constant Support Sizing Tutorial (433 KB)

Constant Support Ordering Checklist Constant Support Ordering Checklist (69 KB)

Constant Supports Fig. 80-V Constant Supports Fig. 80-V (929 KB)

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Anvil Constant Support Load Tables Anvil Constant Support Load Tables (0 )

Constant Support Fig 81H Type F Installation Instructions Constant Support Fig 81H Type F Installation Instructions (3 MB)

Constant Supports Fig. 81-H Constant Supports Fig. 81-H (782 KB)

Constant Support Metric Sizing Tables Constant Support Metric Sizing Tables (6 MB)