Tension Assembly 44118=139738 for Singer 31, 331K Sewing Machine
Regular price
$6.90 USD
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Tension Assembly (Part #44118 / 139738) – For Singer 31 & 331K
Achieve flawless stitch consistency with the Tension Assembly (Part #44118 / 139738). This complete upper tension unit is precision-engineered for Singer 31 and 331K industrial machines. As the "brain" of your thread delivery system, this assembly regulates the flow of the upper thread, ensuring perfectly balanced stitches across a wide variety of fabric weights and industrial applications.
Key Performance Features
Complete Professional Unit: Includes the tension post, discs, beehive spring, check spring, and thumb nut—everything required for a full system overhaul.
Precision-Ground Tension Discs: Features ultra-smooth, mirror-polished discs that provide even pressure on the thread, preventing erratic tension spikes and thread shredding.
Responsive Check Spring: Equipped with a high-resilience spring (43946/8511) to control thread slack during the needle's descent, ensuring crisp loop formation.
Micro-Adjustable Control: The fine-thread thumb nut allows for granular adjustments, making it easy to switch between lightweight synthetics and heavy-duty bonded threads.
Industrial Grade Build: Constructed from hardened steel and corrosion-resistant alloys to withstand the high-speed friction and heat of continuous industrial use.
Orders are typically processed within 1–3 business days.
We ship from our Georgia, USA warehouse. If an item is temporarily unavailable in the U.S., we source it through our global supplier network and will notify you of the estimated lead time.
Free shipping is available on U.S. orders over $99.
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We stand behind the quality of the products we sell.
• Genuine OEM parts are covered by the manufacturer's warranty where applicable.
• Aftermarket and generic parts are covered against manufacturing defects.
• If you receive a damaged, defective, or incorrect item, please contact us within 30 days of delivery.
• Warranty does not cover damage caused by improper installation, misuse, normal wear, or modifications.
If you have any questions, our support team is happy to help before or after your purchase.