Quick Change Self Locking Drill Bits 5D 8D

RONGKE is a China manufacturer offering the Quick Change Self Locking Drill Bits 5D 8D for buyers who need to confirm the difference in usable drilling depth between 5D and 8D. The 5D and 8D self-locking drills extend the same replaceable-tip system to deeper holes. The choice between them is driven by effective hole depth and chip travel distance, rather than a different tip-replacement principle.

How the Assembly Works

Choosing 5D or 8D changes the available drilling depth within the TD system. The longer chip path calls for a review of the entry arrangement and coolant access rather than a different replacement-tip principle.

Key Facts at a Glance

Four Checks Before Ordering

Choose 5D or 8D by actual depth

For the Ø20–20.90 mm group, TD05 lists 103 mm effective depth and TD08 lists 163 mm. Use the shorter version where it covers the feature.

Review entry alignment for the longer body

Check assembled runout and the entry strategy before using the 8D version. The longer reach needs its own setup review rather than inheriting the 5D setup unchanged.

Maintain the self-locking tip pairing

Both depth options retain the TDPA system. Confirm the same diameter-group seating and matched wrench before transferring a tip between compatible bodies.

Plan the longer chip path

Review chip exit space and coolant continuity through the assembled body. Compare the available machine supply with the actual hole depth and workpiece material.

Application Fit

Choose the Quick Change Self Locking Drill Bits 5D 8D when the job calls for the difference in usable drilling depth between 5D and 8D. The 5D and 8D self-locking bodies serve progressively deeper features within the same tip system. Compare effective depth, chip travel and working projection when selecting between them.

Selection guide — 5D vs 8D self-locking: the Ø20 mm group increases effective depth from 103 to 163 mm and overall length from 187.6 to 247.6 mm. The TDPA replacement principle remains the same.

FAQ

1. Q: How do 5D and 8D differ at the same diameter?

A: At the cited Ø20 mm group, effective depth is 103 mm for 5D and 163 mm for 8D; overall length also increases.

2. Q: Can I use an 8D body without reviewing the entry setup?

A: Review entry alignment, assembled runout and any guidance needed for the longer configuration before use.

3. Q: Does moving from 5D to 8D require an unrelated tip system?

A: No. Both use the TDPA family, but the diameter-group seat and wrench must still match.

4. Q: What changes in process planning when moving from 5D to 8D?

A: The longer chip path and working projection need review alongside the entry setup and actual coolant connection.

Inspection and Supply Details

Production & inspection

For this order, inspection should address 5D/8D length identification, locking-tip seating and runout at the intended longer projection. Add the required tolerances to the purchase drawing before agreeing an acceptance record.

Quotation Checklist

RONGKE handles supplier enquiries for the Quick Change Self Locking Drill Bits 5D 8D through factory quotation review. Include the drawing details that establish the difference in usable drilling depth between 5D and 8D.