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Cleveland #12-28 UNF spiral point tap, cobalt black oxide finish, 3 5/32 in overall length

Cleveland

Cleveland Spiral Point Tap #12-28 UNF 3 5/32 in Cobalt 96113

SKU CH-AFZF-23XYZ

Cuts #12-28 UNF threads in 3 5/32 in cobalt steel with 3 flutes and 75 % thread drill size 4.60 mm

  • Spiral point pushes chips ahead for smoother tapping
  • Cobalt steel with black oxide resists wear in tough materials
  • #12-28 UNF thread cuts fine-pitch holes accurately
  • 3 5/32 in overall length reaches deeper workpieces
  • Three flutes balance strength and chip clearance

Cleveland #12-28 UNF Spiral Point Tap

This Cleveland spiral point tap cuts internal threads in through-holes using a #12-28 UNF thread form. The cobalt construction with black oxide finish resists wear during repetitive tapping operations. Right-hand cutting direction suits standard fastening applications. Three flutes evacuate chips ahead of the cut for smoother thread formation.

Plug-chamfer design limits blind-hole use

The plug chamfer requires several threads of entry before full cutting depth engages, so it is not suited for blind holes that need threads close to the bottom. Chip ejection travels forward through the hole, meaning the workpiece must allow through-access or chips will pack the flutes. Thread limit 2B and class of fit 2B define the tolerance envelope this tap produces.

1 1/16 in thread length sets maximum depth

The 1 1/16 inch thread length determines the deepest continuous thread this tap can cut in a single pass. A 75 percent thread drill size of 4.60 mm is specified for the pilot hole. Overall length reaches 3 5/32 inches. Buyers needing deeper threads or a different thread form must select another tap.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 80% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND

Questions about this item

Should I choose the #12-28 UNF tap or a different thread size?

Choose the #12-28 UNF tap when the drawing or part specifies a number 12 diameter with 28 threads per inch. The 3 5/32 in overall length and 1 1/16 in thread length suit standard through-hole depths for this size.

What does the 75 percent thread drill size of 4.60 mm mean when I cut threads?

Drill the hole to 4.60 mm before tapping. This produces roughly 75 percent thread height, giving strong threads in most steels while reducing torque on the three-flute cobalt tap.

How does the 2B class of fit affect the threads I cut?

The 2B class of fit yields a standard commercial tolerance for unified fine threads. Parts made to this fit assemble freely with matching 2A external threads and gauge within the 2B pitch-diameter limits.

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