Regulating Screw 662 - Tension Adjustment Screw for Singer 29K Shuttle Hook
Regulating Screw 662 - Tension Adjustment Screw for Singer 29K Shuttle Hook is backordered and will ship as soon as it is back in stock.
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Regulating Screw 662 - Tension Adjustment Screw for Singer 29K Shut...
Description
Description
Regulating Screw 662 - Shuttle Hook Tension Adjustment
Part Number: 662
Type: Precision metal tension adjustment screw
Sold: Individually (1 piece)
Related Parts: Works with Shuttle Hook Tension Spring #8611, fits Shuttle Hook #8603 (small bobbin)
Function and Purpose:
The Regulating Screw is a precision metal screw used to adjust the thread tension on the shuttle hook assembly of vintage industrial sewing machines. It is specifically designed to work in tandem with the Tension Spring (Part #8611) to control how much pressure is applied to the bobbin thread as it exits the shuttle, ensuring balanced stitch formation on leather and heavy materials.
Key Functions:
Tension Adjustment: By turning the screw, the operator increases or decreases the pressure the tension spring (#8611) exerts on the thread. This fine-tuning capability is essential for achieving proper upper and lower thread balance on leather goods and footwear.
Stitch Stability: Proper adjustment of this screw is essential to prevent skipped stitches or loose loops on the underside of heavy materials. Correct tension ensures professional-quality stitching on boots, bags, and leather repairs.
Serviceability: Because this screw is very small, it is frequently lost during cleaning or maintenance. Keeping spare screws on hand ensures you can quickly restore proper tension adjustment without downtime.
When to Replace:
Replace this screw if it becomes stripped, damaged, or lost during maintenance. A damaged screw cannot provide precise tension adjustment and may cause inconsistent stitch quality.
Compatible Singer Models:
Singer 29 Class: 29-1
Singer 29K Class: 29K71, 29K73, 29K171, 29K171A (machines using small bobbins/Shuttle Hook #8603)
Singer 29U Series: 29U171A, 29U173A
Other Applications: Variant 662S may be used for race cap springs on 15 Class machines
Professional Tip: After installing a new tension spring (#8611), adjust this screw carefully to achieve optimal bobbin thread tension. Start with a moderate setting and test on scrap leather, adjusting incrementally until stitches are balanced and secure.
Specifications
Specifications
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