Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

OSG Spiral Flute Tap: #12-28 UNF, H3 / 2B-3B, 2 Flute - Spiral-Flute Taps for Steel & Stainless Steel
OSGSpiral-Flute Taps for Steel & Stainless Steel

OSG Spiral Flute Tap: #12-28 UNF, H3 / 2B-3B, 2 Flute

The OSG Spiral Flute Tap (#12-28 UNF, MPN 1650501508) is a spiral-flute tap for steel and stainless steel, featuring a H3 / 2B-3B tolerance, 2-flute design, and modified bottoming chamfer. 3G Electric interprets this…

SKU 3G-OTH-218701

Brand
OSG
Item
Spiral Flute Tap: #12-28 UNF, H3 / 2B-3B, 2 Flute
Category
Spiral-Flute Taps for Steel & Stainless Steel
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

OSG
Manufacturer Part Number
1650501508
Type
H3 / 2B-3B, Modified Bottoming Chamfer
Flute
2

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Spiral Flute Tap (#12-28 UNF, MPN 1650501508) is a spiral-flute tap for steel and stainless steel, featuring a H3 / 2B-3B tolerance, 2-flute design, and modified bottoming chamfer. 3G Electric interprets this demand and sources the genuine OSG product, backed by specialist expertise across 14 industrial departments.

Frequently Asked Questions

What is the OSG Spiral Flute Tap #12-28 UNF used for?

The OSG Spiral Flute Tap #12-28 UNF is designed for threading blind holes in steel and stainless steel. Its spiral flute design evacuates chips upward, preventing clogging, making it ideal for automotive, aerospace, and general manufacturing applications where clean, accurate threads are required.

What are the specifications of the OSG Spiral Flute Tap #12-28 UNF?

This OSG tap has a #12-28 UNF thread size, H3 / 2B-3B tolerance, 2 flutes, and a modified bottoming chamfer. The manufacturer part number is 1650501508. It is designed for threading steel and stainless steel, providing precise thread formation in blind-hole applications.

Where to buy the OSG Spiral Flute Tap #12-28 UNF worldwide?

You can source the OSG Spiral Flute Tap #12-28 UNF through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations, ensuring you receive genuine OSG tooling for your manufacturing operations.

How to select the correct OSG Spiral Flute Tap for steel?

Select an OSG spiral flute tap based on thread size, tolerance class, and material. For steel and stainless steel blind holes, use a tap with a modified bottoming chamfer and H3 / 2B-3B tolerance. Ensure the tap matches your hole depth and thread requirements for optimal chip evacuation and thread quality.

Used in

Common applications for OSG
Automotive engine block production — OSG micro drill bits for oil gallery and coolant passage drilling in cast iron
Medical device manufacturing — OSG micro drill bits for drilling bone screw pilot holes in stainless steel implants
Aerospace component machining — OSG micro drill bits for fastener holes in titanium alloy structural parts
Mold and die making — OSG micro drill bits for cooling channel drilling in hardened tool steel (HRC 45-50)
Electronics enclosure fabrication — OSG micro drill bits for precision holes in aluminum alloy housings (with appropriate coating selection)
General engineering job shops — OSG micro drill bits for small-diameter hole drilling in mild steel and alloy steel parts

OSG Products

3G Electric supplies OSG spiral-flute taps for steel & stainless steel. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
OSG Spiral Flute Tap: #12-24 UNC, H3 / 2B-3B, 2 Flute, Modified Bottoming Chamfer (MPN 1650501408)
OSG
OSG Spiral Flute Tap: #12-24 UNC, H3 / 2B-3B, 2 Flute, Modified Bottoming Chamfer (MPN 1650501408)
OSG Spiral Flute Tap: 1/4"-28 UNF, H3 / 2B-3B, 2 Flute, Modified Bottoming Chamfer (MPN 1650501908)
OSG
OSG Spiral Flute Tap: 1/4"-28 UNF, H3 / 2B-3B, 2 Flute, Modified Bottoming Chamfer (MPN 1650501908)
OSG Spiral Flute Tap: 1/4"-28 UNF, H4 / 2B-3B, 2 Flute, Modified Bottoming Chamfer (MPN 1650501808)
OSG
OSG Spiral Flute Tap: 1/4"-28 UNF, H4 / 2B-3B, 2 Flute, Modified Bottoming Chamfer (MPN 1650501808)
OSG Spiral Flute Tap: 5/16"-24 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1650502308)
OSG
OSG Spiral Flute Tap: 5/16"-24 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1650502308)
OSG Spiral Flute Tap: #10-32 UNF, H3 / 2B-3B, 2 Flute, Modified Bottoming Chamfer (MPN 1650501208)
OSG
OSG Spiral Flute Tap: #10-32 UNF, H3 / 2B-3B, 2 Flute, Modified Bottoming Chamfer (MPN 1650501208)
OSG Spiral Flute Tap: 3/8"-24 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1650502708)
OSG
OSG Spiral Flute Tap: 3/8"-24 UNF, H3 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1650502708)

More from OSG

View all OSG parts
Spiral-flute tap for threading blind holes in steel and stainless steel. Features 3 flutes, H7 / 2B-3B tolerance, and modified bottoming chamfer for threading close to hole bottom. Chip evacuation upward prevents clogging. Suitable for general machining applications requiring UNC threads
OSG
Spiral-flute tap for threading blind holes in steel and stainless steel. Features 3 flutes, H7 / 2B-3B tolerance, and modified bottoming chamfer for threading close to hole bottom. Chip evacuation upward prevents clogging. Suitable for general machining applications requiring UNC threads
Spiral-flute tap for threading blind holes in steel and stainless steel. Features a modified bottoming chamfer and 3 flutes for efficient chip evacuation. Tolerance H4 / 2B-3B. Manufacturer part number 1645056244
OSG
Spiral-flute tap for threading blind holes in steel and stainless steel. Features a modified bottoming chamfer and 3 flutes for efficient chip evacuation. Tolerance H4 / 2B-3B. Manufacturer part number 1645056244
Spiral-flute tap for threading blind holes in steel and stainless steel. The spiral flute design evacuates chips upward to prevent clogging. V coating and powdered metal construction provide wear resistance for production tapping. Thread size 7/16"-20 UNF, tolerance H5 / 2B-3B, bottoming chamfer, 3 flutes
OSG
Spiral-flute tap for threading blind holes in steel and stainless steel. The spiral flute design evacuates chips upward to prevent clogging. V coating and powdered metal construction provide wear resistance for production tapping. Thread size 7/16"-20 UNF, tolerance H5 / 2B-3B, bottoming chamfer, 3 flutes
Spiral-flute tap for threading steel and stainless steel. #8-32 UNC, H4 / 2B-3B tolerance, 2-flute design with bottoming chamfer. V-coated powdered metal construction. Suitable for blind-hole applications where chip evacuation upward is required
OSG
Spiral-flute tap for threading steel and stainless steel. #8-32 UNC, H4 / 2B-3B tolerance, 2-flute design with bottoming chamfer. V-coated powdered metal construction. Suitable for blind-hole applications where chip evacuation upward is required
Spiral-flute tap for threading blind holes in steel and stainless steel. The spiral flute lifts chips upward to prevent clogging, while the modified bottoming chamfer allows threading close to the hole bottom. Thread size 1/2"-13 UNC, H5 / 2B-3B tolerance, 3 flutes
OSG
Spiral-flute tap for threading blind holes in steel and stainless steel. The spiral flute lifts chips upward to prevent clogging, while the modified bottoming chamfer allows threading close to the hole bottom. Thread size 1/2"-13 UNC, H5 / 2B-3B tolerance, 3 flutes
Spiral-flute tap for threading blind holes in steel and stainless steel. Thread size 1/4"-28 UNF, tolerance H2 / 2B-3B, 3 flutes, modified bottoming chamfer. Chip evacuation upward prevents clogging, allowing threading close to hole bottom
OSG
Spiral-flute tap for threading blind holes in steel and stainless steel. Thread size 1/4"-28 UNF, tolerance H2 / 2B-3B, 3 flutes, modified bottoming chamfer. Chip evacuation upward prevents clogging, allowing threading close to hole bottom
Metric spiral-flute tap for threading blind holes in steel and stainless steel. M5x0.8 thread, D4 / 4H-6H tolerance, 3 flutes with modified bottoming chamfer. Spiral flute design evacuates chips upward, preventing clogging and ensuring clean threads in blind-hole applications
OSG
Metric spiral-flute tap for threading blind holes in steel and stainless steel. M5x0.8 thread, D4 / 4H-6H tolerance, 3 flutes with modified bottoming chamfer. Spiral flute design evacuates chips upward, preventing clogging and ensuring clean threads in blind-hole applications
Metric spiral-flute tap for threading blind holes in steel and stainless steel. Features a modified bottoming chamfer and 3 flutes to lift chips upward, preventing clogging. Tolerance class D3 / 4H-6H. Suitable for general manufacturing applications requiring precise M3x0.5 threads
OSG
Metric spiral-flute tap for threading blind holes in steel and stainless steel. Features a modified bottoming chamfer and 3 flutes to lift chips upward, preventing clogging. Tolerance class D3 / 4H-6H. Suitable for general manufacturing applications requiring precise M3x0.5 threads