Singer Apollo Bobbin Case #421326

Description

Singer Apollo Bobbin Case #421326 is a top-drop, “Apollo-type” bobbin case designed as a direct replacement for Singer sewing machines that use the Apollo/Class 66 bobbin system. This bobbin case securely holds the bobbin, maintains lower-thread tension, and ensures smooth, even stitching performance.

The case includes a tension adjustment screw on the side — giving you the ability to fine-tune lower-thread tension based on thread type and fabric, which helps avoid skipped stitches, thread loops, or uneven stitching.

Made for reliability and consistent performance, this replacement bobbin case is essential when the original becomes worn, cracked, or fails to hold proper tension. It restores proper stitch formation and thread delivery, helping revive older machines or maintain frequent-use machines in optimal working condition.

Compatibility

Part Number: 421326 (also cross-referenced as 421325 / 421325-002 / 421326-901 in some catalogs)

Compatible With: A large range of Singer home-sewing machines that use the Apollo/Class 66 bobbin system. This includes (but is not limited to):

• Basic and mid-level models (e.g. 1022, 1100, 1247, 1250HD, 1263, 1280, 1288, etc.)

• Older and “budget” Singer lines (e.g. 247AP, 288, 353, 354, 502, 507, 509, 510, 513, 514, 518, 522, 527, 530, 533, 534, 538, 560, etc.)

• Many standard domestic machines across varied model numbers — hundreds are listed in supplier compatibility catalogs.

Bobbins: Works with the corresponding bobbins made for the Apollo/Class 66 system — for best results, use correct bobbins to avoid poor tension or stitching issues.

Key Features & Benefits

• Top-drop (drop-in) bobbin case — easy to load and remove.

• Side-mounted tension adjustment screw for fine tuning lower-thread tension.

• Restores proper bobbin thread control for even, balanced stitching.

• Compatible with a broad array of Singer home sewing machines using Apollo/Class 66 system.

• Durable construction suitable for everyday sewing tasks — from lightweight fabrics to heavier materials.

Ideal Use Cases

• Replacement for worn, cracked, or missing Apollo/Class 66 bobbin cases.

• Restoring stitch quality and tension on older Singer machines.

• Routine maintenance to ensure consistent stitch formation.

• Sewing projects requiring reliable lower-thread tension — garment sewing, quilting, alterations, etc.