Standards
MIL-I-81765A, SAE AS81765/1 and the tests on a boot datasheet
Fourteen rows on a straight-boot sheet, and exactly one of them names a military specification.
One row of fourteen carries the military specification
The straight and right-angle sheets publish fourteen properties. Thirteen sit against an ASTM method. The fourteenth sits against MIL-I-81765A and covers resistance to chemicals, solvents, oils and lubricants.
Its value is the word Good. There is no retention percentage, no soak time and no fluid list beside it. If your drawing needs a measured figure after immersion, that figure is not on these sheets.
The row runs across eight sheets here, covering the GHSB straight, GHRB right angle and GHYB Y geometries, lipped and unlipped. It is on neither the two-way nor the three-way sheet. Both of those open by calling the material conforming to stringent military specifications, then name no military standard in the table underneath. Those two answer fluids with numbers instead, so a line asking for MIL-I-81765A on a two-way outlet boot asks for something the published sheet does not state.
A slash sheet is one detail inside a specification
SAE AS81765/1 is a slash sheet. The parent document holds the general requirements; the number after the slash fixes one detail specification within it, with its own configuration and its own qualification tests.
A type test runs on samples of one geometry and qualifies that geometry. It does not travel across to a different outlet count, size or lining, however alike the part codes look.
Three sheets here print the type-test line: Straight Type, Right Angle Type, and Issue 2 of the Y Type sheet dated August 2024. No size list is printed beside it on any of them. So a defence or aerospace drawing citing the slash sheet cites a test on a shape, not an approval covering a chart, and the difference surfaces at inspection.
Every method named on a boot sheet
- ASTM D412
- Tension testing for vulcanised rubber and thermoplastic elastomers. It carries the headline 9.5 N/mm² minimum tensile and 250% minimum elongation on the straight, right angle and Y sheets.
- ASTM D638
- Tensile properties of plastics. It carries only the post-ageing elongation of 200% minimum, one row under a post-ageing tensile that carries D412.
- ASTM D570
- Water absorption, 0.5% maximum. The only moisture figure these sheets publish; there is no ingress rating on a harness boot.
- ASTM D2671
- Test methods for heat-shrinkable tubing, and the workhorse of the pack. Five rows on the straight, right angle and Y sheets: thermal ageing at 175°C for 168 hours, low-temperature flexibility, heat shock, flammability and corrosion resistance. Nine rows on the two-way and three-way sheets, including the headline tensile and every solvent figure.
- ASTM D149
- Dielectric strength, 10 kV/mm minimum on the straight, right angle and Y sheets.
- ASTM D257
- Volume resistivity, 1 × 10¹² ohm.cm minimum on the harness boots. This row says what a part is for, not how well it does it.
- ASTM G-21
- Fungus resistance on synthetic polymers. Reported as no growth.
- ISO 4589
- Oxygen index, ≥28% on the two-way and three-way sheets. Air holds about 21% oxygen, so the material needs a richer atmosphere than the one around it to keep burning unaided.
- ISO 868
- Shore A hardness, 90±2. The scale ends at 100, so that sits near the top of it and matches the sheets calling the material semi-rigid.
- ISO 974
- Low-temperature flexibility, -55°C on the two-way and three-way sheets. The other three report no cracking with no temperature beside it, which is a result without a condition.
- IEC 60243
- Dielectric strength, ≥20 kV/mm on the two-way and three-way sheets. A second method for the same property inside one family.
- UL 224
- Heat shock, 200°C for four hours with no dripping, flowing or cracking. The other family runs hotter and shorter, 250°C for 30 minutes, against D2671.
- IEC 216
- Thermal endurance. It carries the -40°C to +110°C continuous limit on the breakout sheets and appears on no harness boot sheet.
- ASTM D2303
- Inclined-plane tracking and erosion. No failure to 3.25 kV for twenty minutes on the anti-tracking breakout, and absent from every boot sheet here.
- MIL-I-81765A
- One row: chemicals, solvents, oils and lubricants, rated Good. No revision letter and no test group is quoted beside it.
- SAE AS81765/1
- The slash sheet the type test is run against, on three of the ten sheets.
The sheet the military row sits on
| Property | Typical value | Method |
|---|---|---|
| Tensile strength | 9.5 N/mm² (min.) | ASTM D412 |
| Ultimate elongation | 250% (min.) | ASTM D412 |
| Water absorption | 0.5% (max.) | ASTM D570 |
| Thermal ageing | 175°C for 168 hrs | ASTM D2671 |
| Tensile strength, aged | 8.5 N/mm² (min.) | ASTM D412 |
| Ultimate elongation, aged | 200% (min.) | ASTM D638 |
| Low temperature flexibility | No cracking | ASTM D2671 |
| Heat shock, 250°C for 30 min. | No cracking or dripping | ASTM D2671 |
| Flammability | Self extinguishing | ASTM D2671 |
| Dielectric strength | 10 kV/mm (min.) | ASTM D149 |
| Volume resistivity | 1 × 10¹² ohm.cm (min.) | ASTM D257 |
| Corrosion resistance | Non corrosive | ASTM D2671 |
| Resistance to chemicals, solvents, oils and lubricants | Good | MIL-I-81765A |
| Fungus resistance | No growth | ASTM G-21 |
As published on the straight-type, right-angle-type and Y-type boot sheets. The two aged rows are the ones printed directly under thermal ageing. Source: the manufacturer's straight-type boot datasheet.
Which sheet carries what
| Datasheet | Part codes | MIL-I-81765A row | Type-test line | Issue and date |
|---|---|---|---|---|
| Boots - Straight Type | GHSB-111, GHSB-714, GHSB 202-4 | Yes | Yes | Not printed |
| Straight Boot | GHSB-111, GHSB-714, GHSB 202-4 | Yes | Not in the text | Not printed |
| Straight Boot - Lipped | GHSB 111, GHSB 714, GHSB 202-4 | Yes | Not in the text | Issue 2, Aug. 2024 |
| Boots - Right Angle Type | GHRB-111, GHRB-151 | Yes | Yes | Not printed |
| Right Angle Boot | GHRB-111, GHRB-151 | Yes | Not in the text | Not printed |
| Right Angle Boot - Lipped | GHRB-111, GHRB-151 | Yes | Not in the text | Issue 2, Sept. 2024 |
| Boots - Y Type | GHYB-381-1 | Yes | Not in the text | Not printed |
| Boot - Y Type | GHYB-381-1 | Yes | Yes | Issue 2, Aug. 2024 |
| 2 Way Boot | GHS2-N-306, GHS2-N-612, GHS2-N-1218 | None | None | Issue 1, Sep. 2024 |
| 3 Way Boot | GHS3-N-407 | None | None | Issue 1, Sep. 2024 |
Read off the ten harness-boot datasheets this site works from. "Not in the text" means the line is absent from that sheet as extracted. That is a question worth putting to the manufacturer, not a finding against the part.
The type-test line is not on every issue of the same boot
Two sheets cover the straight boot. Both carry the same fourteen-row table and the same GHSB selection chart. One prints the SAE AS81765/1 type-test line and one does not. The same split runs through the right-angle pair and the Y pair. Whichever issue reaches you decides what your file says, while the part on the shelf is unchanged. Where the slash sheet is a contract condition, a written confirmation naming the part code and the sheet issue is worth more than the PDF attached to a quotation.
Three tensile figures for one family, and none of them wrong
The straight, right angle and Y sheets publish 9.5 N/mm² minimum with 250% elongation, by the rubber and elastomer tension method. The two-way and three-way sheets publish ≥15 MPa with ≥500%, by the heat-shrinkable tubing method. The manufacturer's own web page for the right-angle boot publishes a third pair, 12 N/mm² minimum and 350% minimum, by the plastics tension method.
No arithmetic joins them. A dumb-bell cut to a rubber method and a specimen prepared under a tubing method are two different things being pulled, on two different materials. A tensile number with no method beside it is not a specification.
The two dielectric strength figures behave the same way. Each standard fixes its own specimen, electrodes and voltage ramp, so 10 kV/mm and ≥20 kV/mm are outputs of a procedure rather than readings of one property. The larger one is not the better boot.
Resistivity is the row that sorts the family
ASTM D257 is where a part declares its job. The harness boots read 1 × 10¹² ohm.cm minimum. The low-voltage and anti-tracking breakouts read 1 × 10¹⁴ ohm.cm minimum. The semi-conductive breakout reads 1 × 10⁷ ohm.cm minimum, seven orders lower, because it rebuilds a screen rather than insulating.
Same test, same units, opposite intent. Two parts can share an enquiry and a dielectric strength while doing opposite jobs, which is why the words matter before the numbers do.
Four figures no harness boot sheet here publishes
There is no continuous service temperature. There is no thermal-endurance row. There is no tracking or erosion result. There is no revision letter beside MIL-I-81765A and no statement of which test group was applied. The 120°C shrink figure is a process temperature, and the heat-shock results are survival tests on a sample. Neither is a service rating. All four are worth requesting from the manufacturer by name before a drawing quotes one.
What a certificate is, and what it is not
ISO 9001, ISO 14001 and ISO 45001 certify a management system at a company. They describe how work is controlled, not how a part behaves, and no part code appears on any of them.
A test report is narrower and more useful. The CPRI certificate covers 33 kV heat-shrink joints and terminations and dates from August 2012. The ERDA report covers the busbar sleeve. Each names one thing that was tested, which is what makes it evidence.
A UL file number is the most checkable of the set, because anyone can look it up. E328538 covers the heat-shrink tubes and E335936 the Busboot and Bustube shrouds. Neither file is listed against a harness boot code.
A utility approval is bounded by voltage and by the utility issuing it: MSEDCL approved the range to 11 kV in 2015 and 11 kV to 33 kV in 2016. The RoHS and REACH marks on several of these sheets are different again, declaring substance content against a regulation rather than reporting a test.
The line on a drawing that returns comparable quotes
- The part code, not the shape
- GHSB-714 rather than straight boot. Outlet count and exit angle are settled by the connector long before a diameter is.
- The property, the figure and the method
- Volume resistivity 1 × 10¹² ohm.cm minimum to ASTM D257 is answerable. Good electrical properties is not.
- The sheet you are quoting
- Issue number and date where the sheet carries one. Five of these ten do, and their tables are not identical to the five that do not.
- The fluids, not the word
- Gasoline, diesel oil, acid or alkali, with the soak time and temperature you need them held at. MIL-I-81765A alone returns a rating of Good.
- Both ends of the fit
- The a minimum it passes over and the b maximum it closes onto, in that order. The boot size chart works both ends together.
- What this site never quotes
- No price, lead time, stock position or delivery date appears anywhere here. Those come from the manufacturer, through the enquiry route.
What buyers ask about the paperwork
Does MIL-I-81765A make this a military part?
Is there a military grade of heat shrink boot you can order?
Are the two-way and three-way boots military specification?
Does SAE AS81765/1 cover the whole GHSB and GHRB range?
Which certificates name a specific product?
What is the operating temperature of a harness boot?
One part code, one property, one issue number
The paperwork question is almost always narrower than the enquiry carrying it. A part code, the property with its method beside it, and the issue of the sheet it came from settle it in one exchange.