Countersink

General info, Q&A.

Moderators: scr8p, klavy69

Post Reply
User avatar
Grizzly.RC10
Approved Member
Posts: 106
Joined: Wed Aug 04, 2010 10:39 am
Location: Aussurucq - France
Been thanked: 10 times

Countersink

Post by Grizzly.RC10 »

What countersink use for 4/40 and 8/32 Associated Screw ?
Thanks

User avatar
GoMachV
Approved Member
Posts: 11156
Joined: Sun Apr 29, 2012 10:31 pm
Location: Twin Falls, ID
Has thanked: 743 times
Been thanked: 2146 times

Re: Countersink

Post by GoMachV »

4-40 is 82*
8-32 is 100*
It's time to stand up to the bully. Support the companies that support the industry, not the ones that tear it down. Say no to Traxxas
Factory Works website

User avatar
Grizzly.RC10
Approved Member
Posts: 106
Joined: Wed Aug 04, 2010 10:39 am
Location: Aussurucq - France
Been thanked: 10 times

Re: Countersink

Post by Grizzly.RC10 »

gomachv wrote:4-40 is 82*
8-32 is 100*
Ok for the angle but what diameter size 1/4, 3/8 ? (for exemple ,i founded : 3/8" 100 DEGREE 6 FLUTE CARBIDE COUNTERSINK )
Thanks

User avatar
jwscab
Super Member
Posts: 6479
Joined: Wed Jan 28, 2009 9:42 am
Location: Chalfont, PA
Has thanked: 10 times
Been thanked: 434 times

Re: Countersink

Post by jwscab »

Diameter is not important as long as it's wider than the screw head. 3/8" will work fine for either.

Chewbacca
Approved Member
Posts: 510
Joined: Sat Jun 24, 2006 6:41 am
Location: Herrenberg, Germany
Has thanked: 20 times
Been thanked: 48 times

Re: Countersink

Post by Chewbacca »

Arrrgghhh,

this is SO frustrating!! I was aware that the 8-32s are 100°, but I assumed they all were 100° or the rest at least 90°.

That's what happens when your head is metric I guess. :roll:

At least Home Depot has 82° in stock.... I just received my 100° yesterday
*** POWDER - KING ***

User avatar
jwscab
Super Member
Posts: 6479
Joined: Wed Jan 28, 2009 9:42 am
Location: Chalfont, PA
Has thanked: 10 times
Been thanked: 434 times

Re: Countersink

Post by jwscab »

you'll find that the 100 degree #4 screws fit beautifully in the chassis bottom, almost like they were countersunk for 100 degree screws. I'm pretty sure they were, and associated used 82 degree screws by default. either that or the countersinks were not sunk enough to allow 82 to be flush.

I have a bunch of aircraft stainless 100 degrees I use for most builds using rc10 gold/black pan, and most graphite as well. I hate how the stock 82 don't sit flush (and rust)

Chewbacca
Approved Member
Posts: 510
Joined: Sat Jun 24, 2006 6:41 am
Location: Herrenberg, Germany
Has thanked: 20 times
Been thanked: 48 times

Re: Countersink

Post by Chewbacca »

Yes, but since I converted a graphite chassis to mid motor, I need both countersink drill bits, 100° and 82°. Thinks would have been simpler iff all used the same angle.

I assume that the original tub chassis is too thin for the 8-32 screws to have a 82° or 90° countersink. The flatter 100° does not have this problem.

At least I'll have the correct bit to make all screws sit flush now.
*** POWDER - KING ***

User avatar
mk-Zero
Business Member
Posts: 1678
Joined: Fri Jan 03, 2014 2:14 pm
Location: Orange, CA
Has thanked: 4 times
Been thanked: 19 times

Re: Countersink

Post by mk-Zero »

Yeah, I always assumed they used the 100-degree 8-32's because the chassis material was too thin for more "normal" countersink angles as well.

User avatar
jwscab
Super Member
Posts: 6479
Joined: Wed Jan 28, 2009 9:42 am
Location: Chalfont, PA
Has thanked: 10 times
Been thanked: 434 times

Re: Countersink

Post by jwscab »

Generally, only metric have 90 degree heads.

Post Reply

Create an account or sign in to join the discussion

You need to be a member in order to post a reply

Create an account

Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute

Register

Sign in

  • Similar Topics
    Replies
    Views
    Last post
  • countersink bits
    by m_vice » » in Off-Topic / Chit-Chat
    10 Replies
    975 Views
    Last post by YZ-10
  • Countersink washer size?
    by limestang » » in RC10 Buggy Forum
    3 Replies
    538 Views
    Last post by DaveM

Return to “Temple's RC10 Tech Forum”

Who is online

Users browsing this forum: No User AvatarGoogle Adsense [Bot] and 12 guests