Before you start

DISCLAIMER:
DON'T BE A WOUNDER

This tool is provided for guidance only. Bundle diameters are geometric estimates from published wire dimensions, so you are responsible for verifying fit against real parts and the applicable standards for your application.

Full Boost Consulting Ltd accept no liability for any loss, damage, injury, or cost arising from the use of this tool or reliance on its outputs.

FULL BOOST Bundle Sizer

Stop wounding / start boosting

Bundle cores i Add your wires Pick a spec (55M or 55A), a gauge, and how many of that wire are in the bundle. 55M covers 24-30 AWG; 55A covers 8-30. Below 22 AWG, only 55A is available.
Packed bundle i How this is drawn Each circle is a wire at its finished OD (conductor + insulation) from the TE control drawing. Wires are packed tight and an enclosing circle is drawn around them. Slide-on is how much wider the sleeve is than the bundle before shrinking (ratio of expanded sleeve to bare bundle OD). Bundle / expanded is what percentage of the expanded sleeve the bundle fills. The tool uses 80% as a default maximum, to leave room to slide the sleeving over the bundle.
Bare bundle Ø
-
-
wires
-
CSAmm²
-
fill
DR-25
Add a wire spec above to pack the bundle.
fullboostconsulting.com

Reference & method notes

Geometry only. Each wire is drawn at its finished outer diameter (conductor plus insulation) taken from TE Connectivity control drawings. 55A (55A0111 / M22759/32, tin-coated copper, ETFE, 150°C) and 55M (55M0414, silver-plated alloy, ETFE, 200°C). Wires are packed by a deterministic nearest-fit routine and the bundle diameter is the smallest circle that encloses every wire. Real looms settle differently under tension and tape, so treat this as a tidy-pack estimate, not a guaranteed dimension.

Sleeving uses TE DR-25 (2:1 heat-shrink). A size is recommended that slides over the bare bundle and recovers tight onto it. Sleeved Ø is the bundle plus the size's recovered wall.

Slide-on is how much wider the sleeve is than the bundle before shrinking (ratio of expanded sleeve to bare bundle OD); more makes it easier to fit. It is also quoted as a radial clearance in mm per side.

Bundle / expanded is what percentage of the expanded sleeve the bundle fills. The tool caps this at 80% by default, to leave room to slide the sleeving over the bundle.

Recovery is how far through its shrink range the sleeve travels to grip the bundle: 100% means it recovers fully onto the bundle (bundle at the recovered ID), less means it grips before fully recovering.

Fill is the summed wire OD area divided by the enclosing-circle area. It's a rough measure of how tightly the bundle packs.

Sources: finished-wire diameters from TE Connectivity control drawings (55A0111, 55M0414); DR-25 expanded/recovered diameters and wall thicknesses from the TE DR-25 heat-shrink tubing catalog (1654025).

Disclaimer - don't be a wounder. This tool is provided for guidance only. Bundle diameters are geometric estimates from published wire dimensions, so you are responsible for verifying fit against real parts and the applicable standards for your application. Full Boost Consulting Ltd accept no liability for any loss, damage, injury, or cost arising from the use of this tool or reliance on its outputs.

Built by Full Boost Consulting Ltd

Used it, then built it? Send us a screenshot of the tool (bundle cores and packed bundle), along with the actual measured diameter of your finished bundle. Every real data point helps us improve.

Like the tool? Spotted an issue? Want one built for you, or your team? Get in touch - we'd love to hear from you.

And if it saved you some time, buy us a brew