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MS-25171/ A-A 59178 - Electrical Terminal Boot

Silicone Rubber Terminal Boot for Electrical Connections

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C & M Rubber Co. manufactures four sizes of electrical terminal boot used in products requiring a shock /physical protective cover for electrical terminal posts. Originally designed for use in the aerospace market, the parts have proven to be an effective off-the-shelf solution for electrical connector protection in many other electrical applications such as marine battery terminal covers, hot tub electrical terminal covers, telephone switches to name a few.

Using rubber silicone Class II, 50 Duro (Shore A) per MIL-R-5847, the parts are transfer molded on a 75 ton hydraulic press. They are then batch processed in a cryogenic deflashing system where low temperatures cause the flash to become brittle and break away cleanly, which effectively maintains part integrity and critical tolerances. Using a batch process is very cost efficient and ensures consistent quality, lot to lot. Visual in-process inspections are used to ensure production meets Mil-spec AA-59178 (superseded MS-25171) standards.

These terminal boots tolerate temperatures from -85 to 401°F and are resistant to deterioration from exposure. C & M Rubber manufactures these terminal boots in four standard sizes and certifies them to AA-59178-1, -2, -3, and -4 standards (detailed below). They can be specified in a variety of colors and manufactured to order within 3-30 days, depending on quantity and schedule requirements. For more information on these rubber silicone terminal boots, contact us today.

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MS-25171 Electrical Terminal Boot

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Multi-Cavity Transfer Molding Project Highlights

Product Name Electrical Terminal Boot - MS-25171 & AA-59178
Product Description These Electrical Terminal Boots are used to protect and house electrical terminals.
Capabilities Applied/Processes
Multi-Cavity Transfer Molding
Cryogenic De-Flashing
Equipment Used to Manufacture Part 75 ton Hydraulic Press
Overall Part Dimensions

F - Diameter: 0.16"
Nearest AWG Gauge: 6
Conductor Diameter: 0.1620"
Turns of Wire per Inch: 6.17
Copper Resistance: 1.296 Omega/km

F - Diameter: 0.31"
Nearest AWG Gauge: 1
Conductor Diameter: 0.2893"
Turns of Wire per Inch: 3.46
Copper Resistance: 0.4066 Omega/km

F - Diameter: 0.43"
Nearest AWG Gauge: 000
Conductor Diameter: 0.4096"
Turns of Wire per Inch: 2.44
Copper Resistance: 0.2028 Omega/km

F - Diameter: 0.56"
Nearest AWG Gauge: 0000
Conductor Diameter: 0.4600"
Turns of Wire per Inch: 2.17
Copper Resistance: 0.1608 Omega/km

Tightest Tolerances Certified to new AA-59178 and outdated MS-25171 Spec
Material Used Rubber Silicone Class II, 50 Duro (Shore A) per MIL-R-5847
Material Finish Colors
In process testing/inspection performed Visual in process
Inspected individually twice
Features Withstand temps from -85 to 401°F
Resistant to deterioration by weathering
Industry for Use Electrical
Volume 500,000 plus
Delivery/Turnaround Time Manufactured To Order - 3 days to 30 days ARO
Delivery Location Worldwide
Standards Met Customer Specifications, 2D CAD Drawing
A-A-59178 Commercial Item Description (CID)

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