The GRINNELL G-FIRE Figure 577 Grooved Rigid Couplings provide a rigid joint by firmly gripping along the full circumference of the pipe grooves.
Figure 577 couplings are a proven dependable method of joining pipe and are an economical alternative to welding, threading, or using flanges.
Figure 577 couplings are rated at pressures up to 350 psi (24, 1 bar) depending on pipe size and wall thickness when used in fire protection service applications

Approvals
UL and ULC Listed
FM Approved
VdS Approved
LPCB (Cert. Nos. 669a and 673a)
Refer to Table A for details.

Sizes
1 to 12 Inch (DN25 to DN300)

Housing
Ductile iron conforming to ASTM
A536, Grade 65-45-12

Finish
• Orange non-lead paint
• Red non-lead paint
• Hot-dipped, Galvanized conforming to ASTM A153

Bolts/Nuts
• ANSI:
Carbon Steel oval neck track head bolts are heat-treated and conform to the physical properties of ASTM A183 Grade 2 and SAE J429 Grade 5 with a minimum tensile strength of 110,000 psi.
Carbon Steel heavy hex nuts conform to the physical properties of ASTM A183 Grade 2 and SAE J995 Grade 5. Bolts and nuts are zincelectroplated conforming to ASTM B633.
Stainless Steel bolts and nuts are available upon request.

• Metric:
Carbon Steel oval neck track head bolts (Gold color coded) are heattreated and conform to the physical properties of ASTM F568M with a minimum tensile strength of 760 MPa.
Carbon Steel heavy hex nuts conform to the physical properties of ASTM A563M Class 9. Bolts and nuts are zinc-electroplated conforming to ASTM B633

Gaskets
• Pre-lubricated Grade “A” EPDM,
Violet color code,
-30°F to 150°F (-34°C to 66°C)
For dry and freezer systems, lubrication is required. Refer to Installation Manual IH-1000FP for details.
• Tri-Seal Grade “E” EPDM,
Green color code,
-30°F to 150°F (-34°C to 66°C)