The Truth Hardware (AmesburyTruth) 15 Series EntryGard is a left-hand dual arm casement window operator with a 4-7/16" (112.7 mm) link arm. Its patented dual arm action pushes the sash open while pulling the hinge side toward the open position, so casement windows of many sizes and weights — including those with insulated and double-insulated glass — crank open with very little effort. Typical operating torque is under one foot-pound to swing a 60 lb sash a full 90°. Often called a window crank, opener, winder, or mechanism.

The operator base is high-pressure die-cast zinc with a hardened steel drive worm and gears, protected by Truth's E-Gard multi-stage coating — tested at roughly three times the corrosion resistance of common zinc-plated finishes. It comes in two link offset configurations: link offset - up (model 15.10) and link offset - down (model 15.73). Both pair with Truth 14 Series casement hinges, and the same operator can also run an awning window when mounted on the side jamb with the recommended awning hinge. Handing is determined by the hinge side when the window is viewed from the exterior — this is the left-hand version.

Specifications

• Part numbers: 15.10.00.201 (link offset - up) 
• Series: Truth 15 Series EntryGard
• Handing: Left hand (hinge on the left when viewed from the exterior)
• Link arm: 4-7/16" (112.7 mm)
• Window width: 20"–32" (508–813 mm)
• Window height: up to 60" (1,524 mm)
• Maximum sash weight: 60 lbs (27 kg)
• Material: High-pressure die-cast zinc base; hardened steel drive worm and gears
• Finish: E-Gard electrostatic coating (chip, scratch, and corrosion resistant)
• Compatible hinges: Truth 14 Series casement hinges (see the application table in the spec sheet); not for use with butt hinges or 4-bar hinges except the Truth 34.81
• Crank handle, cover, track, and stud bracket: sold separately (e.g., Truth 11454 Contour handle, 10341 EntryGard snap-on cover)
• Mounting: five #8 Phillips flat head screws (sold separately; type determined by profile material)

Commonly (but not always) stamped "31538" on the arm; may also be marked "20544", "20810", "30470", "30841", "30842", or "31539".