Spherical Firewall Fitting - Ss Ttp 6100

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The 6100 series firewall fitting is all steel and requires only one hole in the firewall. It has a inch steel ball with a swivel angle up to 15 to 25 degrees from straight. It is held onto the firewall with one inch steel nut.

Assembly weighs only .7oz (.04lb).

Ball hole sizes available are .125, .188, .218, .240, .250 and .260.

Meets FAR 23.1191 and AC 20.135 requirements.

Order example: TTP-6100-125 (.125 ball hole size)
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I like these because they only take a single 5/8 hole in firewall. The forward hexes / nuts get safety wired Had to remove the silicone sleeves on the control cable to thread the 0.240 inch cable through the hole. No big deal.

Final A Verified Purchase


October 17, 2023

This fitting will not lock cable in place at firewall,otherwise a good fitting.

Tom B
February 7, 2017


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What size hole has to be drilled in the firewall to get the tachometer ferrule cap through to the tachometer? I will be using the .260 ball for the tach cable.

Drill a 5/8" for installation.

Q: Is the ball split in to two halves? The picture shows a split on exposed end. That would allow for assembly point at main diameter of cable. My cables have fittings at the ends of a larger O.D.

Yes, the center ball the grips the outer housing of the cable is split in two pieces to allow cables with threaded ends to be used.

Q: what size whole is drilled in firewall when using this clamp with a .125 cable?

Part # 05-06929 requires a .625 hole in the firewall.

Q: Is the fitting aluminium or steel?

These are steel.

Q: Whats the difference between the 6000 and 7000 series?

The 6000 series fitting is smaller and has a steel grommet that is 1/2 inch diameter. It can accommodate a cable up to .260 inches and only needs one hole that is .625 diameter in the firewall to mount. The 7000 series has a steel grommet that is 1 inch in diameter. It can accommodate a cable up to .750 diameter. It needs three holes in the firewall to mount, one that is 1.125 inches in diameter and two small holes to clear an 8-32 screw.

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