Log in
Search
Latest topics
» Broken ebay S/W SB-Xby roddie Today at 5:38 pm
» Free Flight Radio Assist
by rdw777 Today at 3:07 pm
» How's the weather?
by roddie Today at 12:46 pm
» music vids.. some of your favorites
by HalfaDave Today at 11:48 am
» More Fun with the Scanner: My May '67 Issue of Model Airplane News: "The Demoiselle"
by rsv1cox Yesterday at 3:31 pm
» Still MORE Scanning: Dale Kirn's "290-Special" in M.A.N. June,1967
by 944_Jim Yesterday at 10:35 am
» **VOTE-ON-THE-NEXT-COX-ENGINE-OF-THE-MONTH** (December 2024)
by MauricioB Yesterday at 4:04 am
» EXTREMELY RARE COX THIMBLE DROME PROTOTYPE "BLACK WIDOW" GAS MODEL AIRPLANE
by a betancourt Tue Dec 10, 2024 2:44 pm
» Really Nice Free Flight Video
by akjgardner Tue Dec 10, 2024 10:36 am
» ebay Top Flight Nobler. Oh well......
by Ken Cook Mon Dec 09, 2024 4:08 am
» Cox control line three line throttle
by 049kid Sun Dec 08, 2024 11:35 am
» "Cox Flying School" in M.A.N. May, 1967
by Kim Sun Dec 08, 2024 6:54 am
Cox Engine of The Month
Cox Engine screw chart
Page 1 of 1
Cox Engine screw chart
Note that this reference doesn't include some engines. The LENGTH-specifications for propeller-screws, may or may-not allow for an OEM spinner.
The ADMIN. may want to move this to appear in the INFO section.. but would it be searchable there?
EDIT: (11/10/2024) Note that the proper LENGTH for the Babe Bee 2-56 fuel tank screws (4) is 11/16" The Golden Bee/Black Widow (8cc fuel tank) uses the 15/16" length screws (4)
The ADMIN. may want to move this to appear in the INFO section.. but would it be searchable there?
EDIT: (11/10/2024) Note that the proper LENGTH for the Babe Bee 2-56 fuel tank screws (4) is 11/16" The Golden Bee/Black Widow (8cc fuel tank) uses the 15/16" length screws (4)
Last edited by roddie on Sun Nov 10, 2024 1:27 am; edited 1 time in total
Re: Cox Engine screw chart
Thanks for the comprehensive list Roddie.
I am encouraging Bernie and Matt to sell the socket head screws as replacement for the round head propeller screws for 049 and smaller size engines. Matt already sells them though, included with the 09 spinner only.
Round head screws are rather short lived. I am not sure how common the socket head screws of these sizes with Whitworth threads in US DIY and hardware shops are..they seem to be unobtainiums outside the US, at least in metric screw environments.
I am encouraging Bernie and Matt to sell the socket head screws as replacement for the round head propeller screws for 049 and smaller size engines. Matt already sells them though, included with the 09 spinner only.
Round head screws are rather short lived. I am not sure how common the socket head screws of these sizes with Whitworth threads in US DIY and hardware shops are..they seem to be unobtainiums outside the US, at least in metric screw environments.
balogh- Top Poster
-
Posts : 4975
Join date : 2011-11-06
Age : 66
Location : Budapest Hungary
Re: Cox Engine screw chart
We used to sell the socket head prop screws for about two years. Unfortunately, they were very poor sellers. We purchased two different lengths in black oxided steel as well as stainless steel in what we believed to be 3-months quantities (50 short / 550 long).
When we finally ran out about two years later, we did not replenish stock. This compares to about 4,000 - 5,000 slot round head ones sold in the same period.
However, we could offer them again in "long" black oxide; the short ones only sold 50 in two years and the SS sold 200 in two years. In the absence of a SS version, we should sell more black ones.
When we finally ran out about two years later, we did not replenish stock. This compares to about 4,000 - 5,000 slot round head ones sold in the same period.
However, we could offer them again in "long" black oxide; the short ones only sold 50 in two years and the SS sold 200 in two years. In the absence of a SS version, we should sell more black ones.
Re: Cox Engine screw chart
Thanks Bernie. I for one would certainly buy them. With the shoulder having no threads right under the head it would perfectly fit in the aluminum spinner thus eliminating vibration.
balogh- Top Poster
-
Posts : 4975
Join date : 2011-11-06
Age : 66
Location : Budapest Hungary
Re: Cox Engine screw chart
balogh wrote:Thanks for the comprehensive list Roddie.
I am encouraging Bernie and Matt to sell the socket head screws as replacement for the round head propeller screws for 049 and smaller size engines. Matt already sells them though, included with the 09 spinner only.
Round head screws are rather short lived. I am not sure how common the socket head screws of these sizes with Whitworth threads in US DIY and hardware shops are..they seem to be unobtainiums outside the US, at least in metric screw environments.
This guy claims to ship worldwide, I got 100 a while back. I can send you a few dozen if you like.
https://www.ebay.com/itm/5-40-x-1-Socket-Head-Cap-Screws-Allen-Hex-Bolts-Stainless-Steel-Qty-100-/263167561935
crankbndr- Top Poster
- Posts : 3112
Join date : 2011-12-10
Location : Homestead FL
Re: Cox Engine screw chart
crankbndr wrote:
This guy claims to ship worldwide, I got 100 a while back. I can send you a few dozen if you like.
https://www.ebay.com/itm/5-40-x-1-Socket-Head-Cap-Screws-Allen-Hex-Bolts-Stainless-Steel-Qty-100-/263167561935
Thanks for the link, he really sells them in 100 lots, which is too many for me. Instead, I would opt for your offer, I sent you a pm.
Thanks again, András.
Last edited by balogh on Fri Jan 24, 2020 8:25 am; edited 1 time in total
balogh- Top Poster
-
Posts : 4975
Join date : 2011-11-06
Age : 66
Location : Budapest Hungary
Re: Cox Engine screw chart
Something like this might be a good option. Not sure if the size you want is available. Looks like these are mainly metric
Personally, I wouldn't prefer the standard cap screw for a prop with a spinner as it spoils the appearance of the spinner's rounded profile. The point of having a spinner is to give a sleek appearance.
The screw that I pictured, if available, would overcome my concerns and I may use them in preference to the slot-head screws
Personally, I wouldn't prefer the standard cap screw for a prop with a spinner as it spoils the appearance of the spinner's rounded profile. The point of having a spinner is to give a sleek appearance.
The screw that I pictured, if available, would overcome my concerns and I may use them in preference to the slot-head screws
Oldenginerod- Top Poster
- Posts : 4022
Join date : 2012-06-15
Age : 62
Location : Drouin, Victoria
Re: Cox Engine screw chart
Thanks, Rod, I agree with your note on aesthetics, the cap type screw head follows the aluminum spinner contour better than the socket head. But the slit head of cap type screws is anything but lasting with the normal screwdriver tip, at least in my experience.
Unfortunately Whitworth thread screws are not easy to find in my area.
Unfortunately Whitworth thread screws are not easy to find in my area.
balogh- Top Poster
-
Posts : 4975
Join date : 2011-11-06
Age : 66
Location : Budapest Hungary
Re: Cox Engine screw chart
balogh wrote:
Unfortunately Whitworth thread screws are not easy to find in my area.
Just one correction, Cox engines do not use Whitworth threads, rather, S.A.E. or Imperial.
https://en.wikipedia.org/wiki/British_Standard_Whitworth
Oldenginerod- Top Poster
- Posts : 4022
Join date : 2012-06-15
Age : 62
Location : Drouin, Victoria
Re: Cox Engine screw chart
I think the screw chart is a good idea , and with a little more research could be completed Medallions ,TDs all ! , space Bugs ,.09 , 15 s lets see there has got to bee more But a good start to the most used !!
getback- Top Poster
-
Posts : 10472
Join date : 2013-01-18
Age : 67
Location : julian , NC
Re: Cox Engine screw chart
Our screw listings generally show application / size / thread, etc and the info can be copied from there: https://coxengines.ca/fasteners/
Last edited by Cox International on Fri Jan 24, 2020 8:26 pm; edited 1 time in total (Reason for editing : Typos :))
Re: Cox Engine screw chart
All the screws used by COX engines are classified as SAE Course Thread.
There are many US companies that will sell in 100 or 50 unit lots and several that will sell standard thread socket or button head screws by the unit.
Bolt Depot is one. A 100 pack of 5-40's is $4.96; by the unit, the screws are $.08 each. An example order would be 100 each of 5-40 x 3/4", 4-40 x 3/4" and 2-56 x 3/4". Shipping is $4.95 for a total of 18.51. Easy peasy -- and never buy another screw.
A 3/4" 5-40 will bottom out in the crankshaft of every 1/2A engine I own. Actually, they have to be ground down a bit, so I bought a 100 pack of 3/4" screws with the intent of cutting them to whatever custom length I needed. Screws can always be cut to an appropriate length and bulk packs are the most economical in the long run. OTOH, should you need only a few of each thread and length, per unit cost may be the better option.
But, the above is just an example of mix and match --- the base shipping stays the same for a pot full of screws. When buying, be sure to add in whatever you may need since shipping is usually the big cost for small orders.
There are many US companies that will sell in 100 or 50 unit lots and several that will sell standard thread socket or button head screws by the unit.
Bolt Depot is one. A 100 pack of 5-40's is $4.96; by the unit, the screws are $.08 each. An example order would be 100 each of 5-40 x 3/4", 4-40 x 3/4" and 2-56 x 3/4". Shipping is $4.95 for a total of 18.51. Easy peasy -- and never buy another screw.
A 3/4" 5-40 will bottom out in the crankshaft of every 1/2A engine I own. Actually, they have to be ground down a bit, so I bought a 100 pack of 3/4" screws with the intent of cutting them to whatever custom length I needed. Screws can always be cut to an appropriate length and bulk packs are the most economical in the long run. OTOH, should you need only a few of each thread and length, per unit cost may be the better option.
But, the above is just an example of mix and match --- the base shipping stays the same for a pot full of screws. When buying, be sure to add in whatever you may need since shipping is usually the big cost for small orders.
Re: Cox Engine screw chart
Thanks Andrew. I think tthe 1 inch long is for aluminum spinner that takes up some of the screw length so it will not bottom out.
balogh- Top Poster
-
Posts : 4975
Join date : 2011-11-06
Age : 66
Location : Budapest Hungary
Re: Cox Engine screw chart
Admin may want to move (or just delete it) this table into the Info section for future reference. Since there had been some discussion concerning screw threads, type and sizes, I've attached a table that lays out typical sizes and thread pitch. This is likely old hat for most of you, but it does list it in one place.
Re: Cox Engine screw chart
You can also find a Cox screw chart on a site that we host. Just click on "Technical Info" once on the site: https://coxengines.ca/cox/www.mh-aerotools.de/airfoils/cox_frameset.htm
Similar topics
» on Medallion .051 Piston and cylinder
» Engine comparison chart
» Can we get some help designing our Cox Engine Troubleshooting Chart?
» engine wanted - twin screw Thermal Hopper
» TD .049/Medallion .049 differences
» Engine comparison chart
» Can we get some help designing our Cox Engine Troubleshooting Chart?
» engine wanted - twin screw Thermal Hopper
» TD .049/Medallion .049 differences
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum