Singer Class 66 Metal Bobbins 10-Pack - Part 172222/32522 - Fits 300+ Models: 66, 99, 201, 401, 403, 500, 503

Singer Class 66 Metal Bobbins - 10 Pack (Part 172222 / 32522)

The most popular vintage Singer bobbin - fits over 300 Singer sewing machine models! This 10-pack of genuine Class 66 metal bobbins (Part 172222, replaces original Singer part 32522) features the distinctive dome-shaped flange and drop-in design that Singer has used for decades. After 20 years in the vintage sewing machine parts business, we've tested bobbins from box stores, fabric shops, and multiple manufacturers - these are the bobbins that work best with vintage Singer machines.

⭐ 80+ Five-Star Reviews! Our customers love these bobbins for their quality, perfect fit, and reliable performance with vintage Singer machines.

Why These Bobbins Work Best:

After 20 years specializing in vintage sewing machine parts, we've learned that not all Class 66 bobbins are created equal. We've tested bobbins from big-box craft stores, fabric shops, and numerous manufacturers. These are the bobbins that consistently perform best with vintage Singer machines.

What our customers say:

• "I use some bobbins at the local big-name craft store that were supposed to fit my Singer 66, but wouldn't sit right in the bobbin case. These are a perfect match!" - Anissa S.
• "These are very high quality steel bobbins. The metal bobbins that came with my machine... over the years I've found you can not rely on many bobbins. Now I saw I have just enough." - Spencer B.
• "Just received my Singer 403A from a friend... perfect match!" - Marina H.
• "Worked perfectly with my 1920s Singer 99" - Austin O.

Key Features:

• 10-Pack Value - Get 10 metal bobbins for just $5.99 ($0.60 each!)
• Dome-Shaped Flange - Distinctive dome top distinguishes from flat-topped alternatives
• Drop-In / Top-Loading Design - Easy to load bobbin system
• Metal Construction - Durable steel for long-lasting performance
• Four Holes Each Side - One smaller drive hole plus three larger holes
• Works with Pin-Drive & Friction-Fit Winders - Universal compatibility
• Fits 300+ Singer Models - From vintage 66/99 to modern HD series
• 20 Years Proven Performance - Tested and trusted by vintage machine experts
• Part # 172222 / 32522 - Replaces original Singer part 32522

Precise Specifications:

Class 66 bobbins have specific dimensions that distinguish them from other bobbin types:

• Outside Diameter: 20.5mm (approximately 13/16")
• Height: 10.8mm (approximately 27/64")
• Axis Diameter: 6.2mm
• Flange Style: Dome-shaped (not flat)
• Hole Pattern: Four holes each side (8 total)
• Drive Hole: One smaller hole for bobbin winder pin
• Material: Quality steel metal
• Bobbin System: Drop-in / Top-loading ONLY

Dome-Shaped Flange - The Class 66 Signature:

The dome-shaped flange is what distinguishes Class 66 bobbins from flat-topped alternatives. This curved top edge is essential for proper fit and function in Singer drop-in bobbin cases. Using flat-topped bobbins in a machine designed for dome-shaped bobbins can cause tension problems and poor stitch quality.

Always verify your existing bobbins have the dome-shaped flange before ordering. If your current bobbins have a flat top edge, you need a different bobbin type.

Four-Hole Design with Drive Pin Compatibility:

These bobbins feature four holes on each side (8 holes total) with one smaller hole specifically for the bobbin winder drive system.

Two Types of Singer Bobbin Winders:

1. Pin-Drive Winders (Models 66, 99, 201, and many others):

• Small pin on bobbin winder shaft
• Pin engages the smaller drive hole in bobbin
• Positive mechanical drive for winding
• These bobbins work perfectly with pin-drive systems

2. Friction-Fit Winders (Model 401 and others):

• Wire spring in the winder shaft
• Spring holds bobbin on the winder
• Friction drives the bobbin to wind thread
• No pin needed - these bobbins work great with friction-fit systems too

Important Notes on Bobbin Winder Compatibility:

• Very Early Model 66: Some very early Model 66 machines may require slight enlargement of the drive hole. This is rare but worth noting for machines from the early 1900s.
• Worn Drive Pins: If your bobbin winder drive pin is worn or damaged (common on 100-year-old machines), the bobbin may not engage properly. This indicates the drive pin needs repair or replacement, not a bobbin issue. These bobbins work perfectly with properly functioning bobbin winders.

Drop-In / Top-Loading Bobbin System:

Class 66 bobbins are designed exclusively for Singer's drop-in (top-loading) bobbin system. This is the system where you drop the bobbin into a bobbin case that's built into the machine bed, then thread it through a slot.

IMPORTANT - Do NOT use with:

• ❌ Front-loading bobbin systems - Can cause mechanical damage
• ❌ Oscillating hook systems - Wrong bobbin type entirely
• ❌ Machines requiring plastic bobbins - Some modern machines with bobbin sensors need clear plastic bobbins
• ❌ Singer 221 Featherweight - Uses a different bobbin type (Class 15)

Always check your machine's manual to confirm it uses a drop-in bobbin system. If you're unsure, compare these specifications to your existing bobbins.

Why Metal Bobbins for Singer Machines:

Vintage Singer machines were engineered to use metal bobbins, and it's important to continue using metal rather than substituting plastic:

• Original Specification - Singer designed these machines for metal bobbins
• Proper Weight - Metal provides the correct weight for optimal tension
• Durability - Metal withstands decades of use without cracking or warping
• Smooth Operation - Metal provides smoother rotation in bobbin cases
• Heat Resistance - Won't deform from friction heat during extended sewing
• Precision Fit - Metal maintains dimensional accuracy over time
• Thread Protection - Smooth metal surface won't snag or fray thread
• Preserve Your Machine - Using correct bobbins helps maintain vintage machine performance

Extensive Singer Compatibility - 300+ Models:

Class 66 is the most widely used Singer bobbin, fitting over 300 Singer sewing machine models from vintage classics to modern machines. This includes:

Iconic Vintage Models:

66, 99, 201, 301, 401, 403, 404, 500, 503

IMPORTANT: Class 66 does NOT fit Singer 221 Featherweight. The Featherweight uses Class 15 bobbins, which are a different size.

Complete Model Compatibility List:

101-1, 1022, 1200-1, 1247, 1263, 1280, 1288, 1802, 1803, 1812, 185, 185J, 1852, 1853, 1862, 1872, 1873, 192, 192K, 201, 201-2, 201K1, 2210, 2112, 2302, 2303, 2304, 2315, 2330, 240, 2404, 241, 242, 2430, 2440, 247, 247AP, 248, 249, 2502, 2503, 2504, 2515, 252, 2530, 257, 258, 259, 263, 2712, 2722, 2724, 2730, 285, 288, 292, 2950, 3101, 3102, 3103, 3105, 327, 327K, 328K Style-O-Matic, 328, 329, 329K, 3314, 3317, 3343, 337, 338, 347, 348, 353, 354, 360, 362, 367, 368, 401, 401A, 403, 403A, 404, 404-1, 404-4, 404-5, 411G, 413, 413G, 413K, 413K13, 416, 416K, 417, 418, 431G, 4325, 4522, 4525, 4526, 4528, 4530, 4538, 4552, 4562, 457, 4572, 4610, 4620, 4622, 466, 476 Stylist, 476K Stylist, 477, 478, 4825, 4828, 4830, 500, 5017, 502, 5028, 503, 503A, 5040, 5050, 507, 509, 513, 514, 518, 522, 527, 533, 534, 538, 5417, 543, 5430, 547, 560, 5605, 5610, 563, 5705, 5710, 57815, 57817, 57820, 57825, 5802, 5805, 5806, 5808, 5810, 5812, 5814, 5816, 5817, 5818, 5820, 5825, 5830, 5838, 588, 5910, 5932, 6011, 6012, 6021, 6038, 609, 6102, 6104, 6105, 6106, 611, 6110, 6120, 6130, 6136, 6146, 6152, 6156, 6174, 6184, 6201, 6202, 6211, 6212, 6214, 6215, 6217, 6221, 6230, 6233, 6513, 6522, 6528, 6533, 6543, 6544, 6548, 66, 6606, 66-1, 66-16, 66-18, 6620, 66-3, 66-6, 66K, 6700 Series, 6704, 7004, 7015, 7021, 7025, 7028, 7033, 7035, 7101, 7102, 7104, 7105, 7106, 7108, 7110, 7136, 714, 717, 717E, 7174, 719, 7211, 7212, 724, 734, 774, 776, 8002, 8007, 8019, 8100, 8200, 8220, 833, 834, 844, 8500, 860, 8600, 8614, 8734, 8774, 8800, 9005, 9008, 9010, 9015, 9018, 9020, 9022, 9027, 9030, 9032, 9034, 9044, 9110, 9130, 9134, 9210, 93220, 9323, 9334, 935U, 9408, 9410, 9416, 9420, 9423, 9430, 9432, 9444, 9500, 9502, 9518, 9600, 9602, 9606, 9608, 9610, 9612, 9614, 9618, 99, 99K, 99-13, 99K26, 99K27, 99K28, 99-31, 9936, CM17, CG500, CG550, CG590, DL17, DX-14C, FM17, FM19, FM22, HD102, HD105, HD110

Always verify your specific Singer model uses Class 66 bobbins before purchasing. Check your machine's manual or compare these specifications (20.5mm diameter, 10.8mm height, dome-shaped flange) to your existing bobbins.

About Singer Class 66 Bobbins:

The Class 66 bobbin system was introduced by Singer with the iconic Model 66 and Model 99 sewing machines in the early 1900s. This drop-in bobbin design was revolutionary at the time, making bobbin changes much easier than the front-loading systems used previously.

Singer continued using the Class 66 bobbin across hundreds of models for over a century, from the classic black Model 66 of the 1910s-1920s, through the colorful mid-century models like the 401 and 500 series, all the way to modern machines like the HD102 and HD105. This makes Class 66 the most common vintage Singer bobbin type.

The distinctive dome-shaped flange and four-hole design became Singer's standard for drop-in bobbin machines, and these specifications remain consistent across all Class 66 compatible models.

Why Stock Extra Bobbins:

• Multiple Thread Colors - Keep different colors wound and ready for your projects
• Save Time - No need to unwind and rewind when changing thread colors
• Organize by Project - Wind bobbins for specific projects in advance
• Prevent Delays - Always have a backup when you're in the middle of a project
• Replace Worn Bobbins - Metal bobbins can develop burrs over time and should be replaced
• Vintage Machine Care - Keep your classic Singer running smoothly with quality parts
• Color Coordination - Match bobbin thread to your fabric colors
• Quilting Projects - Keep multiple bobbins wound for complex quilts
• Garment Sewing - Have bobbins ready for different garment pieces

Bobbin Care for Singer Machines:

• Wind evenly - Use your Singer's bobbin winder for smooth, even winding
• Don't overfill - Leave a small gap at the top to prevent jamming
• Check for burrs - Inspect metal bobbins regularly for rough edges that can snag thread
• Keep clean - Wipe off lint buildup periodically
• Store properly - Keep wound bobbins in a bobbin box to prevent thread tangling
• Match thread quality - Use quality thread appropriate for your machine
• Engage drive hole - For pin-drive winders, ensure pin engages the smaller hole
• Replace when damaged - Don't use bobbins with dents, burrs, or damage
• Verify dome shape - Ensure the dome-shaped flange isn't flattened or damaged
• Check bobbin case - Clean your bobbin case regularly for smooth bobbin rotation

Perfect For:

• Vintage Singer Owners - Quality bobbins for your classic 66, 99, 201, 301
• Singer 401/403/404 Owners - Perfect fit for these popular mid-century models
• Singer 500 Series Owners - Reliable bobbins for 500, 503, and related models
• Modern Singer HD Owners - Fits HD102, HD105, HD110 and other HD models
• Vintage Sewing Enthusiasts - Maintain your cherished vintage Singer
• Quilters - Keep multiple thread colors wound and ready
• Garment Sewers - Have bobbins ready for different fabric colors
• Multi-Project Sewers - Switch between projects without rewinding
• Singer Collectors - Proper parts for your vintage machine collection
• Sewing Machine Repair - Stock replacement bobbins for Singer service
• Gift Giving - Perfect for any Singer owner (except Featherweight - they need Class 15!)

Quality Replacement Bobbins:

These are quality replacement bobbins (aftermarket) that work as direct replacements for Singer part 172222 (replaces original Singer part 32522). They're manufactured to the exact Class 66 specifications (20.5mm diameter, 10.8mm height) with the proper dome-shaped flange and four-hole design to match the original equipment bobbins.

After 20 years in the vintage sewing machine parts business, we've tested countless Class 66 bobbins from various manufacturers. We've compared bobbins from big-box craft stores, fabric shops, and multiple suppliers. These are the bobbins that consistently perform best with vintage Singer machines.

Why choose these replacement bobbins? Many experienced Singer owners keep a supply of quality replacement bobbins for everyday sewing, reserving their original Singer bobbins as backups. These replacement bobbins offer excellent value while maintaining the quality and performance your Singer deserves.

Our customers agree - with over 80 five-star reviews, these bobbins have proven themselves in real-world use with hundreds of different Singer models from the 1910s through today.

10-Pack Convenience:

This product includes 10 metal Class 66 bobbins for just $5.99 - that's only $0.60 per bobbin! The 10-pack format provides exceptional value and gives you enough bobbins to keep multiple thread colors wound and ready for your Singer projects.

Most Singer owners keep 15-30 bobbins on hand - enough to have a variety of thread colors ready while maintaining a backup supply. With this 10-pack, you're well on your way to building a complete bobbin collection for your Singer machine.

What's Included:

10 metal Class 66 bobbins with dome-shaped flange and four-hole design (Part 172222, replaces Singer part 32522), compatible with over 300 Singer sewing machine models including 66, 99, 201, 301, 401, 403, 404, 500, 503, HD102, HD105, HD110, and hundreds more.

Quantity: 10 bobbins per pack
Part Number: 172222 (replaces Singer 32522)
Material: Quality steel metal
Outside Diameter: 20.5mm (approximately 13/16")
Height: 10.8mm (approximately 27/64")
Axis Diameter: 6.2mm
Flange Style: Dome-shaped (not flat)
Hole Pattern: Four holes each side (one smaller drive hole)
Bobbin System: Drop-in / Top-loading ONLY
Winder Compatibility: Pin-drive and friction-fit winders
Application: Singer sewing machines with drop-in bobbin system
Style: Quality replacement (aftermarket)
Compatibility: 300+ Singer models (NOT Featherweight 221)
Customer Rating: 80+ Five-Star Reviews
SKU: 172222-10ct

IMPORTANT COMPATIBILITY NOTES:

• ✓ For Singer drop-in (top-loading) bobbin systems ONLY
• ✓ Verify your machine uses Class 66 bobbins before ordering
• ✓ Check that your existing bobbins have dome-shaped flange (not flat)
• ✓ Measure existing bobbins: 20.5mm diameter, 10.8mm height
• ❌ Do NOT use with front-loading or oscillating hook systems
• ❌ Not for machines requiring plastic bobbins with sensors
  

Backed by 20 years of vintage sewing machine expertise and 80+ five-star customer reviews!