Tension Assembly 44118=139738 for Singer 31, 331K Sewing Machine
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Please send your machine model, required gauge or size, quantity, and clear photos of the machine nameplate or existing components when available.
🌎 International customers are welcome.
We serve customers worldwide. Depending on product availability, orders may be sourced or fulfilled through our USA, Singapore, or international supply network.
Please include your destination country and postal code so we can review the most suitable shipping option.
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We serve customers worldwide. Depending on product availability, orders may be sourced or fulfilled through our USA, Singapore, or international supply network.
Please include your destination country and postal code so we can review the most suitable shipping option.
U.S. customers may also text the product link and photos to
+1 (770) 744-3831
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.
Most in-stock orders are processed within 3 business days, Monday through Friday. Special-order and non-stock items may require additional handling time
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.
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For urgent orders or shipping questions, please contact us before placing your order.
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 promptly. Please see our Return & Refund Policy for eligibility, notification requirements, and applicable return terms.
• Warranty does not cover damage caused by improper installation, misuse, normal wear, Return & Refund Policy modifications.
If you have any questions, our support team is happy to help before or after your purchase.