Multiquip 939654 Screw Shc M12-1.75X30Mm 12.9 Np

The Multiquip 939654 Screw Shc M12-1.75X30Mm 12.9 Np is a genuine OEM fastener designed for the STXDF super-sized hydrostatic ride-on power trowel series. As a direct Multiquip OEM part, 939654 is manufactured to the exact material grade and dimensional specification required for this application — Class 12.9 alloy steel with a M12-1.75 thread pitch and 30mm length. This screw is a direct replacement for the original hardware on STXDF equipment, ensuring correct torque retention and structural integrity at the installation point. Sourcing the correct fastener grade matters in high-vibration trowel applications, and 939654 delivers the rated tensile and proof load values the machine demands.

Key Features

• Class 12.9 High-Tensile Alloy Steel — The 12.9 grade rating means this screw delivers exceptional tensile strength, making it suited to the high-stress, high-vibration fastening points found on ride-on trowel powertrains and blade assemblies.
• Exact M12-1.75 x 30mm Specification — Correct thread pitch and length ensure full thread engagement and proper clamping load at the installation point — no shimming, substitution, or thread chasing required.
• Genuine Multiquip OEM Part — Supplied direct from the Multiquip OEM parts network, so the material grade, surface treatment, and dimensional tolerances match what left the factory on your STXDF machine.
• Built for STXDF Ride-On Trowels — Confirmed fitment for the STXDF super-sized dual-fuel hydrostatic ride-on trowel series, so you can order with confidence using part number 939654.
• Maintains Fastener Torque Integrity — A worn, stripped, or incorrect-grade screw in a high-vibration trowel application can cause joint loosening, component shift, and accelerated wear on surrounding hardware. The correct OEM fastener holds rated clamp load through extended operation.
• Safety-Critical Fastener Application — On ride-on power trowels, fastener failure at key structural or drivetrain points is a safety concern. Using the correct Class 12.9 OEM specification screw supports safe machine operation and operator protection.

A socket head cap screw of this specification serves as a high-strength structural fastener at a critical bolted joint on the machine — typically used where compact installation space demands a hex socket drive and where elevated clamping force is required. The Class 12.9 designation indicates a proof load and tensile strength significantly higher than standard hardware store fasteners, which is why substituting a lower-grade screw in this position can lead to joint failure, loosening under vibration, or damage to mating components. When this screw wears, corrodes, or is replaced with an incorrect grade, the integrity of the bolted connection is compromised, which can cause misalignment or mechanical failure in the assembly it secures.

For fitment questions or to confirm compatibility with your specific STXDF unit, contact the DHS Equipment parts team for assistance.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

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Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.