Heat Shrink 3-Way Boot
Cross-linked polyolefin boot seals a three-way branch on a cable harness, dielectric strength ≥20 kV/mm and tensile strength ≥15MPa, flame retardant.
- ISO 4589
- IEC 60243
- ASTM D2671
Choose a size
Selection Chart
- H
- Diameter of the body (large) end
- J, K, L, N
- Diameters of the neck, finger or branch ends
- s (min)
- As supplied, minimum
- f (max)
- After free recovery, maximum
- P, R, S, T, U
- Lengths, as marked on the drawing
- HW, JW
- Wall thickness
| Gala code | Hs(min) | Hf(max) | Js/Ks/Ls(min) | Jf/Kf/Lf(max) | HW(±20%) | JW(±20%) | P(±10%) | R(±10%) | S(±10%) | T(±10%) | U(±10%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| GH3B-0407 | 13.20 | 6.60 | 6.60 | 3.60 | 1.52 | 1.02 | 46.20 | 25.40 | 20.80 | 30.50 | 15.70 |
| GH3B-0713 | 26.90 | 13.20 | 13.20 | 6.90 | 2.54 | 1.52 | 93.20 | 50.30 | 42.90 | 57.20 | 33.00 |
| GH3B-0713L | 26.90 | 13.20 | 13.20 | 6.90 | 3.05 | 1.70 | 135.10 | 73.70 | 61.50 | 88.90 | 45.70 |
| GH3B-1019 | 38.60 | 18.80 | 19.30 | 9.70 | 3.05 | 1.78 | 135.10 | 73.70 | 61.50 | 88.90 | 45.70 |
| GH3B-1225 | 55.60 | 25.40 | 26.90 | 12.40 | 4.57 | 3.05 | 192.00 | 103.10 | 88.90 | 121.90 | 71.10 |
| GH3B-2754 | 91.40 | 54.60 | 45.70 | 27.40 | 7.11 | 4.57 | 390.40 | 211.10 | 179.30 | 254.00 | 127.00 |
All dimensions are in mm. s: as supplied; f: after free recovery. Source: GALA Heat Shrink Boots catalogue, Issue 2, April 2026.
Material properties
Technical Specification
| Technical Specification | ||
|---|---|---|
| Property | Standard Value | Test Standard |
| Oxygen Index | ≥28% | ISO 4589 |
| Dielectric Strength | ≥20kV/mm | IEC 60243 |
| Physical Properties | ||
| Tensile Strength | ≥15MPa | ASTM-D-2671 |
| Elongation at Break | ≥500% | ASTM-D-2671 |
| Hardness (Shore A) | 90±2 | ISO 868 |
| Elongation at break after ageing (130 °C, 168h) | ≥400% | ASTM-D-2671 |
| Heat Shock (200 °C, 4h) | No dripping, flowing or cracking | UL 224 |
| Low temperature flexibility | -55 °C | ISO 974 |
| Solvent Resistance (23 °C, 24h) | ||
| Gasoline | ||
| Tensile strength | ≥11Mpa | ASTM-D-2671 |
| Elongation at break | ≥400% | ASTM-D-2671 |
| Diesel Oil | ||
| Tensile Strength | ≥10Mpa | ASTM-D-2671 |
| Elongation at break | ≥350% | ASTM-D-2671 |
| Acid & Alkali | ||
| Tensile Strength | ≥12Mpa | ASTM-D-2671 |
| Elongation at break | ≥400% | ASTM-D-2671 |
Dimensions & Drawings
This boot seals and strain-relieves the point a cable harness splits into three branches, in semi-rigid flame-retarded polyolefin.
Covered on this page
- Heat Shrink 3 Way Boot
Features & Benefits
- Semi-rigid, flame-retarded polyolefin, standard colour black
- Available with or without adhesive lining
- Dielectric strength ≥20 kV/mm (IEC 60243)
- Tensile strength ≥15MPa, elongation at break ≥500% (ASTM D2671)
- Hardness 90±2 Shore A (ISO 868)
- Heat shock 200°C/4h: no dripping, flowing or cracking (UL 224)
- Low-temperature flexibility to -55°C (ISO 974)
- Oxygen index ≥28% (ISO 4589)
- Elongation at break after ageing at 130°C for 168 hours ≥400% (ASTM D2671)
- Solvent resistance at 23°C for 24 hours: gasoline ≥11MPa, diesel oil ≥10MPa, acid and alkali ≥12MPa tensile strength (ASTM D2671)
- Provides mechanical protection, strain relief and complete environmental sealing on cable harness assemblies
- Size GHS3-N-407
Applications
- Three-way cable harness branch-out sealing
- Military-specification wire harness assemblies
Standards & Compliance
- ISO 4589
- IEC 60243
- ASTM D2671
- ISO 868
- UL 224
- ISO 974
FAQs
Frequently Asked Questions
What is the Heat Shrink 3-Way Boot used for?
It is used for:
- Three-way cable harness branch-out sealing
- Military-specification wire harness assemblies
How do I choose the right size?
A heat-shrink part is chosen by two diameters. As supplied (Hs (min)) it must open wider than the largest thing it has to slide over; after shrinking (Hf (max)) it must close smaller than the smallest thing it has to grip. Measure both on your cable or busbar and pick the first code in the selection chart that satisfies both.
How is it installed?
Clean and degrease the surface, position the part, then shrink it with a gas torch or a hot-air gun: keep the heat moving round it with a smooth, brushing motion so it recovers evenly without scorching. The instruction sheet in each kit gives the full sequence step by step, including where to start shrinking.
Which standards and test methods are quoted for it?
These, with the values in the Technical Specification on this page:
- ISO 4589
- IEC 60243
- ASTM D2671
- ISO 868
- UL 224
- ISO 974
Can I get a quote, a sample or a size that is not listed?
Send your cable details, quantity and application with the "Request a Quote or Sample" form at the foot of this page. For a size or variant that is not in the chart, describe what you need there, or use Technical support at the top of the page, and the technical team will confirm what can be supplied.
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ISO 9001:2015
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