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Brand: Victaulic
Victaulic Style 77 Standard Flexible Coupling
Description
Standard rigid-flexible grooved coupling for carbon steel pipe
The Victaulic Style 77 is a standard flexible grooved coupling that joins roll-grooved or cut-grooved carbon steel pipe, fittings and valves with a two-bolt housing and a pressure-responsive gasket. Because the joint is flexible, each coupling accepts pipe end separation, angular deflection and expansion or contraction, which reduces stress on equipment connections and removes the need for welding or flanging on many pipe runs. Grooved joints of this type are widely specified for chilled water, hot water, cooling water, compressed air and fire protection pipework in plants, buildings and utilities, where installation speed and a clean, no-hot-work joint matter.
The housing is ductile iron with an orange enamel finish as standard, and the gasket grade is chosen to suit the service. The coupling covers sizes from 3/4 in. to 24 in. (DN20 to DN600) and handles pressures from full vacuum up to 1000 psi (69 bar), depending on the size, pipe material and wall thickness.
Technical specifications
Values are from Victaulic publication 06.04 (Rev Y, updated 09/2026). Full size tables are in the attached PDF.
| Parameter | Specification |
|---|---|
| Type | Standard flexible coupling, Victaulic Original Groove System (OGS) |
| Sizes | 3/4 to 24 in. / DN20 to DN600 |
| Pipe material | Carbon steel; stainless steel pipe per Victaulic publications 17.09 and 17.01 |
| Pressure | Full vacuum (29.9 in Hg) up to 1000 psi / 6894 kPa / 69 bar, depending on size and pipe |
| Housing | Ductile iron, ASTM A536 Grade 65-45-12 |
| Housing coating | Orange enamel (standard); hot-dip galvanized and others optional |
| Gasket Grade E | EPDM, -30 to +230 F / -34 to +110 C; not for petroleum or steam service |
| Gasket Grade T | Nitrile, -20 to +180 F / -29 to +82 C; for petroleum products and oil vapor air |
| Bolts and nuts | Zinc-electroplated carbon steel oval-neck track bolts; 316 stainless steel optional (imperial sizes) |
| Pipe preparation | Cut or roll grooved to Victaulic OGS specification (publication 25.01) |
| Listings shown in leaflet | LPCB LPS 1219 (ref. 104-1a/04), EN 10311, CPR (EU) 305/2011 |
Dimensions and ratings
Selected sizes from the dimension table. Y is the housing length; the leaflet also gives X, Z, allowable pipe end separation and deflection for every size.
| Nominal size, in. / DN | Actual OD, in. / mm | Bolts | Bolt size, in. | Y, in. / mm | Weight, lb / kg |
|---|---|---|---|---|---|
| 3/4 / DN20 | 1.050 / 26.9 | 2 | 3/8 x 2 | 4.00 / 102 | 1.1 / 0.5 |
| 2 / DN50 | 2.375 / 60.3 | 2 | 1/2 x 2-1/2 | 5.88 / 150 | 2.6 / 1.2 |
| 3 / DN80 | 3.500 / 88.9 | 2 | 1/2 x 2-3/4 | 7.13 / 182 | 3.7 / 1.7 |
| 4 / DN100 | 4.500 / 114.3 | 2 | 5/8 x 3-1/4 | 8.88 / 226 | 6.7 / 3.0 |
| 6 / DN150 | 6.625 / 168.3 | 2 | 3/4 x 4-1/4 | 11.88 / 302 | 12.0 / 5.4 |
| 8 / DN200 | 8.625 / 219.1 | 2 | 7/8 x 5 | 14.75 / 374 | 20.8 / 9.4 |
| 12 / DN300 | 12.750 / 323.9 | 2 | 1 x 6-1/2 | 19.25 / 488 | 31.1 / 14.0 |
| 24 / DN600 | 24.000 / 609.6 | 2 | 1-1/8 x 4 | 31.00 / 788 | 89.6 / 40.5 |
Maximum working pressure by size group, based on standard-weight steel pipe, roll or cut grooved to Victaulic specification:
| Nominal size | Maximum working pressure, psi / kPa |
|---|---|
| 3/4 to 6 / DN20-DN150 | 1000 / 6895 |
| 8 to 12 / DN200-DN300 | 800 / 5516 |
| 14 to 22 / DN350-DN550 | 300 / 2068 |
| 24 / DN600 | 250 / 1724 |
Selection and installation notes
Confirm the pipe outside diameter and groove type, choose the gasket grade for the fluid and temperature, and check the working pressure for the pipe wall thickness in use. The leaflet gives allowable separation and deflection figures for standard roll-grooved pipe and notes that the figures should be reduced for design and installation purposes, by 50 % for 3/4 to 3-1/2 in. and 25 % for 4 in. and larger. Pipe larger than 14 in. in roll-groove systems is served by the Style W77 AGS coupling. For other grooved products see the Victaulic Style 107N coupling and the wider range under Pipes and Fittings.
Documents and quotation
The attached Victaulic publication 06.04 holds the full dimension, performance and gasket tables. For a quotation, send the pipe size and material, gasket grade, coating, bolt type and quantity.
Datasheets & Documents
- Datasheet Victaulic publication 06.04 Style 77 standard flexible coupling (Rev Y) Download
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About brand
Grooved pipe joining started with Victaulic in 1919, and the company, based in Easton, USA, still sets the reference for couplings that join pipe without welding or flanges. Seven Star LLC lists Victaulic couplings and butterfly valves, among them the Style 107N QuickVic rigid coupling, and supplies Victaulic couplings and fittings for mechanical, utility and process piping in Oman on inquiry.
Victaulic Style 107N QuickVic couplings
The Style 107N is a rigid coupling for roll-grooved or cut-grooved carbon steel and stainless steel pipe in sizes from 2 to 12 inches (DN 50 to DN 300). Victaulic rates it from full vacuum up to 750 psi (5171 kPa), but the working pressure of a given joint depends on pipe material, wall thickness and size. The housing has an angled bolt pad that makes the joint rigid, and a galvanized finish is optional.
Where Victaulic couplings are used and what to send
The manufacturer names HVAC, utility and process piping as the applications for this style. For an inquiry, send the style number, nominal size, pipe material and schedule, the fluid and temperature so the gasket grade can be checked, the housing finish and the quantity. GCC consultants often ask for the submittal sheet, which we provide from the manufacturer.
Browse Victaulic products by category: Pipes & Fittings.
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Frequently Asked Questions
What sizes does the Victaulic Style 77 cover?
Sizes from 3/4 in. to 24 in. (DN20 to DN600) for carbon steel pipe prepared to the Victaulic OGS groove specification.
What is the maximum working pressure?
Up to 1000 psi (69 bar) for sizes through 6 in., falling to 800 psi for 8 to 12 in., 300 psi for 14 to 22 in. and 250 psi for 24 in., based on standard-weight steel pipe.
Which gasket should I choose?
Grade E EPDM suits cold and hot water within -30 to +110 C but not petroleum or steam; Grade T nitrile suits petroleum products within -20 to +82 C.
Is the Style 77 rigid or flexible?
It is a flexible coupling that allows pipe end separation, angular deflection and expansion or contraction at each joint.
What material is the housing?
Ductile iron to ASTM A536 Grade 65-45-12, finished in orange enamel as standard, with galvanizing optional.
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