Stamped Casting / OEM Numbers: S600-27 27-RED SPB-27 500-27-R 900-27
Compatible Units: Keller, Acorn, Alenco, Ply Gem, Silver Line, and Simonton Tilt & Non-Tilt Single/Double-Hung Windows
Critical Dimensions & Spec: 27" metal tube length; 5/8" (9/16" nominal) outer diameter; Red nylon weight-range bushing (10–29 lbs sash weight)
Use this cross-reference table to confirm that the number stamped or printed on your original hardware or circuit board corresponds to SpecFoundry SKU SF-WIN-109:
| Stamped / OEM Part Number | Manufacturer / System Brand | Compatible Models & Years | SpecFoundry Replacement SKU |
|---|---|---|---|
S600-27 | Caldwell / AmesburyTruth | Keller, Acorn, Alenco, Ply Gem, Silver Line, and Simonton Tilt & Non-Tilt Single/Double-Hung Windows | Direct Match (SF-WIN-109) |
27-RED | Caldwell / AmesburyTruth | Keller, Acorn, Alenco, Ply Gem, Silver Line, and Simonton Tilt & Non-Tilt Single/Double-Hung Windows | Direct Match (SF-WIN-109) |
SPB-27 | Caldwell / AmesburyTruth | Keller, Acorn, Alenco, Ply Gem, Silver Line, and Simonton Tilt & Non-Tilt Single/Double-Hung Windows | Direct Match (SF-WIN-109) |
500-27-R | Caldwell / AmesburyTruth | Keller, Acorn, Alenco, Ply Gem, Silver Line, and Simonton Tilt & Non-Tilt Single/Double-Hung Windows | Direct Match (SF-WIN-109) |
900-27 | Caldwell / AmesburyTruth | Keller, Acorn, Alenco, Ply Gem, Silver Line, and Simonton Tilt & Non-Tilt Single/Double-Hung Windows | Direct Match (SF-WIN-109) |
Technicians and property owners typically replace S600-27 when experiencing one or more of the following failure modes:
Tilt sash inward and remove from frame. Unhook spiral balance foot from pivot shoe using a spiral balance tensioning tool, give 4–5 clockwise turns on the red-tip rod, and seat into shoe.
Related Technical Guide: Truth Hardware Casement Window Operator Stamped Casting Number Identification Guide →
On Caldwell / AmesburyTruth assemblies, look for the stamped or die-cast numbers (S600-27, 27-RED, SPB-27, 500-27-R, 900-27) on the underside of the metal housing, along the link arm, on the stainless hinge track, or printed on the circuit board/valve label. Note that casting numbers identify the housing casting, so always confirm critical dimensions (27" metal tube length; 5/8" (9/16" nominal) outer diameter; Red nylon weight-range bushing (10–29 lbs sash weight)) as well.
Yes. SF-WIN-109 is verified to match the mounting footprint, electrical/mechanical ratings, and dimensional envelope of Caldwell / AmesburyTruth S600-27, 27-RED, SPB-27, 500-27-R, 900-27 used on Keller, Acorn, Alenco, Ply Gem, Silver Line, and Simonton Tilt & Non-Tilt Single/Double-Hung Windows.
Before ordering, verify: (1) Stamped or OEM code matches one of S600-27, 27-RED, SPB-27, 500-27-R, 900-27; (2) Dimensional spec matches: 27" metal tube length; 5/8" (9/16" nominal) outer diameter; Red nylon weight-range bushing (10–29 lbs sash weight); and (3) Application matches: Keller, Acorn, Alenco, Ply Gem, Silver Line, and Simonton Tilt & Non-Tilt Single/Double-Hung Windows.
SF-WIN-109 ships within 1–2 business days from our US warehouse network. Flat-rate US Ground shipping is $8.95, or FREE on orders of $150+. You can check out online immediately via PayPal, Venmo, Credit/Debit Card, or request an Instant Card Payment Link / Net-30 Commercial PO Invoice.
Stamped / OEM: 45159 / 45160 / 30842 / 31876
Specs: Dual-arm sill mount; 3-7/8" & 4-3/4" mounting hole spacing; 11/32" spline; fits 24"–36" sash wi
In Stock · Ships 1–2 Days
Stamped / OEM: 50.00 / 50.50 / 45251 / 45252
Specs: 9-1/2" hardened steel arm; rear/sill 3-hole mount; 33% reduced crank torque gearing; Tango/Enco
In Stock · Ships 1–2 Days
Stamped / OEM: 03408 / 0C57 / 048290 / 048291
Specs: 9-1/2" center-to-center steel arm; 3-hole triangular sill flange; includes matching 03408 / 0C5
In Stock · Ships 1–2 Days
Stamped / OEM: 1361358 / 1361356 / 1361318 / 1361316
Specs: Split-arm linkage; 3/8" spline shaft; Stone/Terratone/White compatible; stamped 7198-17 on arm
In Stock · Ships 1–2 Days