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Uncoated M8x1.00 straight flute hand tap with four flutes and plug chamfer

Helicoil

Helicoil 5484-8 M8x1.00 Straight Flute Hand Tap Plug Uncoated 4 Flutes

SKU CH-HF6E-947K7

Cuts M8x1.00 internal threads in existing holes with a 32.00 mm cutting length and 74.00 mm overall length using four straight flutes and a plug chamfer

  • Product typeHole, Drill, Bore & Wire Gauges
  • M8x1.00 metric fine thread fits precise holes
  • Plug chamfer starts threads easily in through-holes
  • Four flutes clear chips for smoother cutting
  • High-speed steel construction resists wear during use
  • 00 mm overall length reaches deeper holes

Thread Repair Tap for M8x1.00 Holes

The Helicoil 5484-8 is a straight-flute hand tap designed to cut internal threads for M8x1.00 metric fine screw-thread inserts. It suits technicians and mechanics performing thread repair or creating new tapped holes in metal components. The uncoated high-speed steel construction provides a cost-effective option for general-purpose workshop use.

Sustained Cutting Behaviour

With four straight flutes and a plug chamfer, the tap evacuates chips forward during continuous rotation. The 32.00 mm thread length and 74.00 mm overall length allow deep engagement without frequent withdrawal. High-speed steel retains hardness during extended hand-tapping sessions, reducing the risk of edge breakdown compared to carbon steel alternatives.

D9 Thread Limit Determines Fit

The tap is manufactured to a D9 thread limit, which controls the pitch diameter tolerance of the cut thread. This single specification decides whether the resulting hole will accept a standard Helicoil insert with the correct interference fit. Verify the D9 requirement against the insert manufacturer's data before purchase.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $42.99
Pricier than about 70% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameHelicoil
Product typeHole, Drill, Bore & Wire Gauges

Questions about this item

How much heat or power does the 5484-8 tap generate during all-day threading?

Hand taps like the 5484-8 produce no measurable heat or power draw; cutting force depends on material and lubrication, not the tool itself.

What tap wrench or holder do I need for the 74.00 mm overall length and 4-flute shank?

Use a standard M8 metric tap wrench that fits the 4-flute square drive; the 74.00 mm length works with common adjustable T-handle or ratchet holders.

Will the D9 thread limit and 32.00 mm thread length cut correctly in an existing M8x1.00 hole?

Yes, the D9 limit and 32.00 mm thread length are made for M8x1.00 fine-pitch holes; match the drill size and use cutting oil for clean threads.

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