Truss nut stripped: what replacement nut should I get?

Discussion in 'Hardware, Setup & Repair [BG]' started by joelb79, Jul 25, 2013.

  1. joelb79


    Mar 22, 2006
    Lansing, Michigan
    I was turning the correct sized wrench for my MIM Standard Jazz V bass today and boom.. it stripped out. Now the wrench just spins in the hole. I'm convinced I can back it out but it wont tighten anymore. No good...

    What replacement nut should I purchase? This is a "do-able" job correct? Bass has no other issues other than the stripped nut.

    It seems I've ordered the wrong nuts before and they are hard to size.

    This nut?

    Genuine Fender Mexican truss rod nut with Allen head. For guitar and bass. 3/16".


    Genuine Fender large diameter rod truss rod nut. 5/16". As used on the Deluxe Zone bass and Standard Jazz bass V.
  2. wcoffey81


    Feb 3, 2012
    S/E Michigan
    if you take it to Elderly would they be able to tell you which one it has?
  3. soflbass


    Mar 2, 2013
    S Florida
    What size Allen key did you use on the original? My MIM bass 4 string uses a 3/16", which is the first part you posted. The larger part you posted uses a 5/16" Allen key.
  4. hdracer


    Feb 15, 2009
    Elk River, MN.
    5/16" ???
    That's a HUGE allen wrench
  5. P Town

    P Town

    Dec 7, 2011
    I was surprised to find that my 2004? MIM Deluxe Jazz truss rod took a 3/16, and not metric hex wrench.

    I recommend that you use only USA, (or German, or Swiss) made hex wrenches.

    It would be a shame to cause damage to an instrument by using a cheap Chinese tool.
  6. soflbass


    Mar 2, 2013
    S Florida
    Believe it or not, some fenders had this size.
  7. hdracer


    Feb 15, 2009
    Elk River, MN.
    Gibson uses a 5/16 hex NUT
    Fender uses socket head nuts.
    A socket head screw that could accept a 5/16 allen wrench would have to be about 1/2" diameter.

    Look at this photo to see the size

  8. fourstringdrums

    fourstringdrums Decidedly Indecisive Supporting Member

    Oct 20, 2002
  9. hdracer


    Feb 15, 2009
    Elk River, MN.
    I have owned Standard (MIM) and Highway One's

    They had 5mm nuts

    I think it's a miss print.
    If you have a Allen wrench set, look at a 5/16 allen wrench and see what I mean
  10. fourstringdrums

    fourstringdrums Decidedly Indecisive Supporting Member

    Oct 20, 2002
    Then it's 3/16". I'd go with the mexican nut since you have a mexican bass.

    If that was 3/16" then you have your answer. You can just back it off all the way and thread the new nut on.
  11. hdracer


    Feb 15, 2009
    Elk River, MN.
    If it is MIM it should use a 5 mm wrench. That's why it stripped.

    3/16= .1875
    5mm= .1969
  12. fourstringdrums

    fourstringdrums Decidedly Indecisive Supporting Member

    Oct 20, 2002
    I'm not saying your wrong, but is every site that says that a MIM nut is 3/16" wrong?
  13. hdracer


    Feb 15, 2009
    Elk River, MN.
    It's close, try a 5mm Allen in it.
    3/16 is a little sloppy
    5mm= honeymoon fit
    Danpirvine likes this.
  14. I bought a MIM Jazz V with a truss rod nut cracked in the corners so it slipped. I used an "easy out" (screw extractor) with a 1/4" drive socket, ratchet, and extension to back out the old nut and it backed right out. I ordered the Mexican truss rod nut which was correct, but one (came in a 2 pack) wasn't threaded deep enough and the other wasn't threaded at all. When I called the parts place, they offered to refund my money, but that wouldn't fix my neck. I took the nuts to a friend who is a machinist who found the size of the threads and tapped both nuts and they worked perfect. If your new nut bottoms out, take it off and put washers on the rod under the nut and you'll have more adjustment. I've seen several of these basses for sale with a "broken truss rod", Probably because it bottomed out and the owner horsed the nut until it broke or slipped. Actually it's an easy and inexpensive fix if you have any mechanical inclination. It's not rocket science.
  15. soflbass


    Mar 2, 2013
    S Florida
    I can understand the confusion, cause I am confused as well.
    On basspartresources, they show 2 sizes: one Mexican truss rod nut 3/16" and one called truss rod nut large rod which they label as 5/16". The fender site also lists it as 5/16". Maybe its a misprint or maybe its the OD of the nut. I've never owned a jazz v so I am not sure what size Allen key it takes. Above, someone mentioned that its 5mm metric. The OP has also not mentioned what size Allen key he used on the original. My 4 string uses a 3/16".
  16. hdracer


    Feb 15, 2009
    Elk River, MN.
    I just grabbed a 2006 MIM fretless Jazz neck I have.

    I removed the nut using a 5mm allen wrench. If it was 3/16 a 5mm would not fit (see above)
    I measured the od of the nut with a Starrett micrometer. It measures .3119

    5/16= .3125

    They must mean OD of the nut.

    As I said, a 3/16 wrench will fit in a 5mm hole but it will eventually round it out.

    I have seen nuts with a bur on top, making it hard to fit a 5mm wrench in. When I put a 3/16 in it it went in tight but once seated it felt loose. I have had to tap a 5mm in to break the bur but after that the 5mm always went in and I have never rounded out a nut.
    RSBBass likes this.
  17. soflbass


    Mar 2, 2013
    S Florida
    Good info hdracer. Maybe they used 2 different allen key sizes on the MIM basses? Ive always used the 3/16" on my MIM nut because the spec sheet says so:
    Model Name: FSR Standard Precision Bass ® (Natural)
    Model Number: 013-0150-(521)
    Series: Standard Series
    Body: Ash
    Neck: Maple
    Fingerboard: Rosewood (9.5” Radius/241 mm)
    No. of Frets: 20 Medium Jumbo Frets
    Scale Length: 34” (864 mm)
    Width @ Nut: 1.625” (41 mm)
    Hardware: Chrome
    Machine Heads: Standard
    Bridge: Standard Vintage Style
    Pickguard: 3-Ply White Pearloid
    Pickups: Standard Precision Bass Split Single-Coil (Mid)
    Pickup Switching: N/A
    Controls: Volume,
    Colors: (521) Natural,
    (Polyester Finish)
    Strings: Super Bass 7250ML, NPS, p/n 073-7250-005.
    Gauges: .045, .065, .080, .100.
    Unique Features: "New" Knurled Chrome P Bass ® Knobs
    Source: Mexico
    Accessories: None
    U.S. MSRP: $641.99
    COMMENTS: Limited Run of 250 Units for Guitar Center
    WRENCH SIZES: Truss Rod 3/16" p/n 0038467000,
    Saddle Height 1/16" p/n 0021109000
  18. joelb79


    Mar 22, 2006
    Lansing, Michigan
    I've been using a 3/16" hex wrench. That 5mm thing is golden that should save this from happening in the future! 3/16 Nut it is thanks everybody for the replies!

    Model Name: Standard Jazz Bass® V (Five String), Rosewood Fingerboard, Black, 3-Ply Parchment Pickguard, No Bag
    Model Number: 0146600506
    Series: Standard
    MSRP: $899.99
    Color: Black
    Body Material: Alder
    Body Shape: Jazz Bass®
    Body Finish: Polyester
    Neck Shape: Modern "C"
    Number of Frets: 20
    Fret Size: Medium Jumbo
    Position Inlays: White Dot
    Fingerboard: Rosewood
    Fingerboard Radius: 9.5" (241 mm)
    Neck Material: Maple
    Neck Finish: Tinted Satin Urethane
    Nut Width: 1.875" (47.6 mm)
    Scale Length: 34" (864 mm)
    Neck Plate: 4-Bolt Standard
    Truss Rod Nut: 3/16" Hex Adjustment
  19. soflbass


    Mar 2, 2013
    S Florida
    Next time I adjust my truss rod, I'll be trying a 5 mm allen key. Good to know.

    Whenever I need to tighten, I always remove much of the truss tension using the bend method, so there is not much force on the truss nut and it turns easily. Never had a nut strip on me.
    T. Brookins likes this.
  20. walterw

    walterw Supportive Fender Commercial User

    Feb 20, 2009

    it's 3/16" for mexi and american standard basses, and has been for decades now!

    5mm won't fit.