Relay Box Attachment Screw sizes?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by wlai, Feb 14, 2020.

  1. wlai

    wlai Junior Member

    Joined:
    Sep 22, 2007
    28
    3
    0
    Location:
    Pacific NW USA
    Vehicle:
    2008 Prius
    Model:
    Touring
    Sorry I looked but couldn't find a thread on this nor via Google.

    In changing my spark plugs I lost one of the two screws that attaches the Relay Box in the engine bay to the firewall area. I found the Relay Box but it doesn't specify the screw's spec:

    Relay Box - Toyota (82742-47020) | Toyota Parts

    [​IMG]

    It's a 10mm head but I can't find the thread spec. Anyone knows what's the TPI and size etc?

    Thanks.
     
  2. SFO

    SFO Senior Member

    Joined:
    Feb 7, 2017
    2,217
    2,502
    0
    Location:
    Northern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    Your profile makes no mention where on this planet you're at, which might allow for more concise advice.

    Take the one bolt and visit a hardware store (cheaper than a dealer), find the proper size diameter and length, then marry the two bolts together to see if the thread pitch matches. If too confusing or unsure, hand it to a hardware jockey and they'll match it for you.

    If the silver color is a turnoff, take a black marker and touch up.both bolts so they match.
     
    #2 SFO, Feb 14, 2020
    Last edited: Feb 14, 2020
    Raytheeagle, wlai and Georgina Rudkus like this.
  3. Georgina Rudkus

    Georgina Rudkus Senior Member

    Joined:
    Sep 15, 2018
    736
    551
    0
    Location:
    Taylors, SC
    Vehicle:
    2012 Prius v wagon
    Model:
    Two
    Most likely M6x1.0 with a 10mm hex. Most all lightweight components use this size on Toyotas.
     
    Mendel Leisk, wlai and SFO like this.
  4. MickyMatter

    MickyMatter Active Member

    Joined:
    Mar 2, 2015
    194
    125
    0
    Location:
    Germany
    Vehicle:
    2008 Prius
    Model:
    II
    I don't know.
    But if it's a standardized metric screw, the thread must be an ISO M6×1. This means a thread with a nominal (outer) diameter "d" of 6 mm and a thread pitch "P" of 1 mm.
    Usually such screws have a wrench size of 10 mm. serveimage.jpg

    SM-G950F ?
     
    wlai and SFO like this.
  5. Georgina Rudkus

    Georgina Rudkus Senior Member

    Joined:
    Sep 15, 2018
    736
    551
    0
    Location:
    Taylors, SC
    Vehicle:
    2012 Prius v wagon
    Model:
    Two
    Toyota uses only fasteners compliant with the J.I.S. or Japan Industrial standard.

    It happens that the threads and head sizes are the same as the DIN or Deutsches Institut für Normung e.V , which has been incorporated into the ISO or International Standards Organization.
     
    wlai and SFO like this.
  6. Georgina Rudkus

    Georgina Rudkus Senior Member

    Joined:
    Sep 15, 2018
    736
    551
    0
    Location:
    Taylors, SC
    Vehicle:
    2012 Prius v wagon
    Model:
    Two
    I have seen small quantities of the particular flange bolts in the small specialty fasteners drawers at local Home Depots.
     
    Mendel Leisk and wlai like this.
  7. SFO

    SFO Senior Member

    Joined:
    Feb 7, 2017
    2,217
    2,502
    0
    Location:
    Northern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    Yeah, some stores (maybe ACE stores) even carry metric sizes colored in black now.
     
    Raytheeagle, wlai and Georgina Rudkus like this.
  8. TMR-JWAP

    TMR-JWAP Senior Member

    Joined:
    Aug 12, 2016
    2,648
    3,125
    0
    Location:
    Columbia, SC
    Vehicle:
    2007 Prius
    Model:
    Touring
    I can't imagine why people think that we Prius owners are a bunch of dorks. jeez....

    It's just a common M6 with a captured flat washer if you want to find an identical match. About 14mm length from the seating side of the washer to end of threads.

    So much BS for a simple answer.

    And I'll add more nerdiness...

    torque value is 8.4 N*m or 74 in-lb

    or for a normal person...snug it up...
     
    #8 TMR-JWAP, Feb 14, 2020
    Last edited: Feb 14, 2020
  9. Georgina Rudkus

    Georgina Rudkus Senior Member

    Joined:
    Sep 15, 2018
    736
    551
    0
    Location:
    Taylors, SC
    Vehicle:
    2012 Prius v wagon
    Model:
    Two
    Standard M6 bolts come in 8,10,12,16,20, 25,30, 35 and so on lengths.

    14mm is not a standard length.

    I know, because over the years in fastening sourcing for manufacturing, I have made company purchases of millions of bolts.
     
  10. TMR-JWAP

    TMR-JWAP Senior Member

    Joined:
    Aug 12, 2016
    2,648
    3,125
    0
    Location:
    Columbia, SC
    Vehicle:
    2007 Prius
    Model:
    Touring

    Thank you for proving my point. And I've probably personally installed a hundred thousand, I've ordered hundreds and hundreds of tons of wire, but guess what, it all means nothing..no one gaf. I'm fairly certain bolt length is measured from under the head to the end of the threads. Also pretty sure I said it was about 14mm from the seating surface of the flat washer to the end of the threads. Isn't that what he would need if just buying a flanged bolt? Do I need to remove a bolt from my car and post a photo of the bolt with a set of calipers on it?

    Quit trying to make everything rocket science, he just needs approximate dimensions so he can buy a stinkin' bolt.
     
  11. Georgina Rudkus

    Georgina Rudkus Senior Member

    Joined:
    Sep 15, 2018
    736
    551
    0
    Location:
    Taylors, SC
    Vehicle:
    2012 Prius v wagon
    Model:
    Two
    As a matter of fact, I am a rocket scientist. I wish everyone as careful and particular as rocket scientist worked on my car rather than some ill trained YAHOO who overtightens simple things as an oil drain plug.
     
    wlai likes this.
  12. TMR-JWAP

    TMR-JWAP Senior Member

    Joined:
    Aug 12, 2016
    2,648
    3,125
    0
    Location:
    Columbia, SC
    Vehicle:
    2007 Prius
    Model:
    Touring
    Yeah, you've mentioned that a few times. Did you think it was coincidence I used that phrase? If everyone as careful and particular as rocket scientist worked on my car it would probably never get out of your driveway.
     
  13. Georgina Rudkus

    Georgina Rudkus Senior Member

    Joined:
    Sep 15, 2018
    736
    551
    0
    Location:
    Taylors, SC
    Vehicle:
    2012 Prius v wagon
    Model:
    Two
    Correct! Some of them should NEVER leave the driveway.
     
  14. eljefino

    eljefino Junior Member

    Joined:
    Dec 9, 2018
    30
    17
    0
    Location:
    Maine
    Vehicle:
    2006 Prius
    Model:
    Two
    In a pinch you can run a ziptie through the missing fastener's holes. It'll keep that relay box from rattling as much and stressing the remaining bolt-- or, more accurately, the plastic tab that surrounds it.
     
Loading...