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Truth Hardware Maxim 50.50 Dyad Split-Arm Casement Operator, Sill Mount, Right Hand (Link 31876) Engineering Diagram
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SPECFOUNDRY SKU: SF-WIN-102 · BRAND REF: Truth Hardware / AmesburyTruth

Truth Hardware Maxim 50.50 Dyad Split-Arm Casement Operator, Sill Mount, Right Hand (Link 31876)

Stamped Casting / OEM Numbers: 50.50 31876

Compatible Units: Right-hand sill-mount casement windows that originally used the Truth Maxim 50.50 Dyad operator (used 1999-2019 by Caradco, Crestline, Hurd, Lincoln, Vetter and Weathershield, per the supplier)

Critical Dimensions & Spec: Arm link 4-7/8" (123.8 mm), link hole centers 4-3/8" (111.1 mm); for 11" or 15" glass; operator only, no crank handle or screws

$59.99
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Pre-Order Dimensional Verification Checklist

OEM Cross-Reference & Stamped Casting Number Table

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-102:

Stamped / OEM Part Number Manufacturer / System Brand Compatible Models & Years SpecFoundry Replacement SKU
50.50Truth Hardware / AmesburyTruthRight-hand sill-mount casement windows that originally used the Truth Maxim 50.50 Dyad operator (used 1999-2019 by Caradco, Crestline, Hurd, Lincoln, Vetter and Weathershield, per the supplier)Direct Match (SF-WIN-102)
31876Truth Hardware / AmesburyTruthRight-hand sill-mount casement windows that originally used the Truth Maxim 50.50 Dyad operator (used 1999-2019 by Caradco, Crestline, Hurd, Lincoln, Vetter and Weathershield, per the supplier)Direct Match (SF-WIN-102)

Common Failure Symptoms Solved by SF-WIN-102

Technicians and property owners typically replace 50.50 when experiencing one or more of the following failure modes:

  • Crank turns but the window does not open or close
  • Stripped gear in the operator housing
  • Bent or broken split arm

Step-by-Step Dimensional Verification & Installation Notes

Open the sash, unclip the link from the sash bracket, remove the six sill screws, and swap the operator. Check that the link arm is stamped 31876 and that the window is right-hand before ordering. In-stock finishes at the supplier on 2026-10-30: Champagne stainless, Oil Rubbed Bronze stainless, Polished Brass E-Gard.

Frequently Asked Technical Questions (50.50)

Where is the casting or OEM part number (50.50 / 31876) stamped on this part?

On Truth Hardware / AmesburyTruth assemblies, look for the stamped or die-cast numbers (50.50, 31876) 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 (Arm link 4-7/8" (123.8 mm), link hole centers 4-3/8" (111.1 mm); for 11" or 15" glass; operator only, no crank handle or screws) as well.

Does SpecFoundry SKU SF-WIN-102 directly replace OEM part 50.50 (50.50, 31876)?

Check the part number and model before ordering. SF-WIN-102 is sold as Truth Hardware / AmesburyTruth 50.50, 31876 for Right-hand sill-mount casement windows that originally used the Truth Maxim 50.50 Dyad operator (used 1999-2019 by Caradco, Crestline, Hurd, Lincoln, Vetter and Weathershield, per the supplier). If you are unsure, email us a photo of the old part and the appliance or window label before you order.

What measurements should I verify before ordering SF-WIN-102?

Before ordering, verify: (1) Stamped or OEM code matches one of 50.50, 31876; (2) Dimensional spec matches: Arm link 4-7/8" (123.8 mm), link hole centers 4-3/8" (111.1 mm); for 11" or 15" glass; operator only, no crank handle or screws; and (3) Application matches: Right-hand sill-mount casement windows that originally used the Truth Maxim 50.50 Dyad operator (used 1999-2019 by Caradco, Crestline, Hurd, Lincoln, Vetter and Weathershield, per the supplier).

How fast does SF-WIN-102 ship and what payment methods are accepted?

SF-WIN-102 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.

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