This is an O.S. #7 Glow Plug. Recently developed to focus on easier running at low and medium speeds, this plug is a slightly hotter heat range than the O.S. #8 plug. This plug is ideal for helicopter engines with superior performance around hovering RPM range, which is critical for smooth and powerful 3D and F3C type flight. Also great all around plug for most 2-stroke standard plug airplane, helicopter and car engines.
| Model | Heat Range | Description |
| No.6 | Hot | Formerly known as the OS A3 plug. This hot plug will provide a more stable idle and crisp acceleration when compared to a cold plug. This plug is recommended for low nitro content fuels and .12 class engines. |
| No.7 | Medium Hot | Slightly “hotter” than the #8 and ideal for the constant “on/off” throttle action in 1/10 and 1/8 scale racing. |
| No.8 | Medium | A medium heat range plug for 1/8 scale racing and most .12-21 car, boat and truck engines. |
| No.10 | Cold | Formerly known as the OS A5 plug. This is now rated as a cold plug and is recommended for high nitro content fuel. This cold plug will produce the most power, but will provide a less stable idle and a narrow tuning window |
This product was added to our catalog on November 19, 2009
- O.S. Engines 55 HZ-H
Christoforos Marinou Verified Owner Sunday, Mar 15 2020 (about 5 years ago) O.S. No.7 Short Body Standard Glow Plug “Medium Hot” Very good glow plug for low & high rpms. Also grade idle in my engine. I use it in my savage with 5.9 engine & power master 25% fuel. Engine works 100-110c with body shell & many time to play. Exterior temperature in my place was 20c. Better from os no.8 in that engine. 1 customer found this review helpful. VM Verified Owner Thursday, Jul 12 2012 (about 13 years ago) O.S. No.7 Short Body Standard Glow Plug “Medium Hot” Excellent with 16% nitro on hot weather with GX-21 1 customer found this review helpful. HUNTER DURST Tuesday, May 14 2024 (about a year ago) O.S. No.7 Short Body Standard Glow Plug “Medium Hot” Really good plugs I run them in my SH.18 holds a tune very well and run 220-240 degrees on a warm day very nice. Bought a bulk pack of these just to have. Michael Gonzales Verified Owner Wednesday, Jan 25 2023 (about 2 years ago) O.S. No.7 Short Body Standard Glow Plug “Medium Hot” Exactly as described and fast shipping as always!Great product!O.S is where it’s at! Anonymous Verified Owner Saturday, Sep 24 2011 (about 14 years ago) O.S. No.7 Short Body Standard Glow Plug “Medium Hot” I have been using these plugs in my SH.28 and works fine. Holds idle well good power range too. I cant tell the difference from the No:8 and this except the price.. 0 of 2 customers found this review helpful. View all reviews
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