Truth Hardware Casement Window Operator Identification Guide: Stamped Casting Numbers (30842, 31876, 45159, 15.18, 20755) to Exact Replacement SKU
Why searching the number stamped on your broken casement crank arm (like 30842, 31876, or 20755) often brings up the wrong part — and how to match your casting mark and arm measurements to the exact replacement operator in 60 seconds.
1. Why Stamped Casting Numbers (30842, 31876, 20755) Are Not Catalog Part Numbers
When a casement window crank strips its internal gear teeth or shears a link arm on a Marvin, Andersen, Pella, Caradco, Hurd, Norco, or Jeld-Wen window, homeowners and glaziers flip the operator over and find a 5-digit number die-cast into the zinc housing or stamped into the steel link arm — most commonly 30842, 31876, 20755, 31260, or 7198-17.
On Truth Hardware (AmesburyTruth) components, those 5-digit numbers are raw foundry mold/casting identifiers for a single sub-component (such as the bottom gear housing cover or the detached link arm), NOT the complete operator assembly SKU. Below is the verified engineering cross-reference table mapping every common Truth, Andersen, Marvin, and Pella casting mark to the complete replacement assembly.
2. Master Casting Mark to Exact Replacement SKU Cross-Reference Table
| Stamped / Casting Number on Old Part | Where It Is Stamped | OEM Series & Critical Measurement | Exact Replacement SpecFoundry SKU | Order |
|---|---|---|---|---|
30842 / 31876 / 20755 / 15.18 / 45159 / 45160 |
Underside of zinc sill housing (30842) or link arm (31876) | Truth EntryGard 15-Series & Encore Dual-Arm Operator; 3-7/8" & 4-3/4" hole spacing | SF-WIN-101 (Truth 45159 / 15.18 Dual-Arm) | |
50.00 / 50.50 / 45251 / 45252 / 31260 |
Top of sealed gear housing under snap-off cover | Truth Maxim & Encore Single-Arm Tangential Operator; 9-1/2" arm, 3-hole mount | SF-WIN-102 (Truth 50.50 / 45251 Maxim/Encore) | |
03408 / 0C57 / 048290 / 048291 |
Stamped on steel operator arm & interior jamb lock body | Pella Architect, Designer & ProLine 9-1/2" Single-Arm Operator & Lock Spec | SF-WIN-103 (Pella 03408 / 048290) | |
1361358 / 1361356 / 1361318 / 7198-17 |
Stamped on lower split-arm knuckle linkage | Andersen Perma-Shield Split-Arm Casement Operator (1982–1995), 3/8" spline | SF-WIN-104 (Andersen 1361358 Split-Arm) | |
10899098 / 10500662 / 45181 / 11860220 |
Baseplate casting on Marvin Ultimate & Integrity units | Marvin Ultimate Casement Operator & Sequential Multi-Point Gear Box | SF-WIN-108 (Marvin 10899098 / 10500662) | |
31761 / 11576 / 36-083 / 14.05 |
Stamped on 10" stainless steel sill track & brass shoe link | Truth 14-Series 10-Inch Heavy-Duty Stainless 4-Bar Hinge Pair | SF-WIN-105 (Truth 31761 10" Hinge Pair) | |
14.75 / 14.80 / 31331 / 36-048 |
Stamped on 14-3/4" stainless concealed casement hinge track | Truth Maxim 14.75" Rear-Mount Concealed Casement Hinge Pair | SF-WIN-110 (Truth 14.75 Maxim Hinge Pair) | |
14.18 / 14.90 / 82-265 / 2022-M |
Stamped on 11-3/4" stainless mortise lock faceplate | AmesburyTruth Dual-Hook 2-Point Mortise Patio Door Lock Body (11" hole spacing) | SF-WIN-107 (AmesburyTruth 14.18 / 82-265) |
3. How to Determine Left-Hand (LH) vs. Right-Hand (RH) on Truth & Andersen Operators
- Truth Hardware Rule (Interior View): Stand inside the home looking at the closed window. Whichever side the lock is on (opposite the hinges) determines Truth handing — OR look at the side of the operator where the worm-gear crank input shaft sits.
- Andersen Perma-Shield Rule (Exterior View): Stand outside looking at the window. If the hinges are on the left side, Andersen designates it a Left-Hand (LH) unit (
1361358/1361356). - Pro Tip: Include your stamped number or handing note in the checkout box and our fulfillment desk verifies exact handing before dispatch.
4. Why You Should Inspect the 4-Bar Hinges When an Operator Strips
Over 70% of stripped Truth 30842 / 45159 and Maxim 50.50 casement operators fail because the bottom stainless casement hinge shoe (31761 or 14.75) is packed with drywall dust or corrosion, forcing the crank gear to carry 3x normal torque. Always clean and lubricate the sill hinge track with dry PTFE spray when installing a new operator.