Please login or register.
Login with username, password and session length

Capital Area Cobra Club

August 31, 2014, 12:14:19 AM
Pages: [1] 2   Go Down

Author Topic: USS vs SAE?  (Read 10608 times)

0 Members and 1 Guest are viewing this topic.

Offline Scott Harrison

  • "Elder", "Pappy", " We do not stop playing because we grow old, we grow old because we stop playing!"― Benjamin Franklin
  • Approval Moderator
  • Member
  • ****
  • Posts: 11651
  • "Growing old is mandatory, growing up is optional"
    • Great Falls, VA
    • Cobra Inc.

USS vs SAE?
« on: January 30, 2005, 08:50:26 PM »
OK engineers, what is the difference between USS & SAE bolt threads? I'm looking to replace some thread restorers.

I am looking for the the US "coarse" thread, size 7/16"-14. When I located the tools, I see either USS or SAE listed in the tool catalogue for 7/16" size bolts. Is the USS the "coarse" thread and the SAE  the "fine" thread or vice versa?
CSX 4100

Offline Rob Burton

  • Huggy
  • Contributing Member
  • Member
  • ****
  • Posts: 3779

USS vs SAE?
« Reply #1 on: January 30, 2005, 09:16:17 PM »
Scott,
  You're really testing my memory from when I was a Nuclear Machinst's Mate in the Navy (circa 1981), but if I remember correctly they go as follows:

USS= United States Standard (developed by the Navy)
SAE= Society of Automotive Engineers

but then you have

UNC = Unified National Course Thread

and

UNF = Unified National Fine Thread

I thought we were on this Unified Screw Thread Standard

Except for ISO = International Standards Organization (Metric)


Best that I remember, they only use the USS and SAE standards for washers anymore, then it's just large diameter vs. small diameter.

I am remembering all of this 25 years later, so it may not be all there.


Rob :D
"Huggy"

http:/www.rehobothproperties.com

Replicas are the highest form of flattery!!

Offline bill3422

  • Bill Patterson
  • Contributing Member
  • Member
  • ****
  • Posts: 609

USS vs SAE?
« Reply #2 on: January 30, 2005, 10:10:50 PM »
According to the Sears Catalog 17/16 - 14 is "NC" National Course (USS) thread.
Bill Patterson

Mk IV -Setup for 302, Complete IRS
347 Stroker - AFR Heads -Mass-Flo - T5
Duel Roll bar
Halibrand 17" Wheels
Power Steering Rack & Offset Alum Bushings - Breeze
Hydroboost brakes - Forte's Parts

Offline Scott Harrison

  • "Elder", "Pappy", " We do not stop playing because we grow old, we grow old because we stop playing!"― Benjamin Franklin
  • Approval Moderator
  • Member
  • ****
  • Posts: 11651
  • "Growing old is mandatory, growing up is optional"
    • Great Falls, VA
    • Cobra Inc.

USS vs SAE?
« Reply #3 on: January 30, 2005, 10:15:23 PM »
Huggy, Thanks for the acronym definitions...now, can you answer my question?  :wink:

Thanks Bill :)
CSX 4100

Offline rick myers

  • Contributing Member
  • Member
  • ****
  • Posts: 19

Threads
« Reply #4 on: January 31, 2005, 01:25:25 AM »
USS is coarse thread and SAE is fine thread.
         Rick Myers

Offline InProcess

  • Ken Caniglia
  • Contributing Member
  • Member
  • ****
  • Posts: 2545
    • Waldorf, MD
    • Ken C's Lone Star

USS vs SAE?
« Reply #5 on: January 31, 2005, 09:38:57 AM »
Would agree with Rick about threads, however not sur eif strength is different as well.  Ie SAE are harder than USS.  Not sure if this is true thought.

393 ci SBF Lone Star

Offline StephenP

  • Stephen Price
  • Contributing Member
  • Member
  • ****
  • Posts: 2215
    • Adelphi, MD

USS vs SAE?
« Reply #6 on: January 31, 2005, 03:39:25 PM »
Sorry I have to disagree - not positive but circa 1968 as a steam turbine kind of guy- USS is a wider washer than SAE.  So I had to run down a reference,  from the Bolt Depot:

(  http://www.boltdepot.com/fastener-information/Abbreviations.aspx )

USS Pattern (washers). These washers have a larger outside diameter than SAE pattern washers, Also used to indicate US Course Thread

Yes I buy from them - good prices on small stainless stuff.
D.B. does that mean "No Sweat"
FFR4247K 5.0 EFI, T-5, 3.08

Offline Wade Chamberlain

  • The Beaver
  • Contributing Member
  • Member
  • ****
  • Posts: 8507

USS vs SAE?
« Reply #7 on: January 31, 2005, 04:01:41 PM »
what Rick said...

USS = coarse
SAE = fine

Wade Chamberlain

Offline tfarhood

  • The Farhood family
  • Contributing Member
  • Member
  • ****
  • Posts: 618

USS vs SAE?
« Reply #8 on: January 31, 2005, 05:50:28 PM »
Hey Scott, just buy a complete set of everything and then you'll have the one you need (and you'll have the one I need next time also :wink: ).

Scott tuned my carb!

Offline SchmidtAl

  • Captain Crunch
  • Contributing Member
  • Member
  • ****
  • Posts: 2568
    • Lake Ridge, VA

USS vs SAE?
« Reply #9 on: January 31, 2005, 05:52:09 PM »
See Wile E, wasn't this easier than just looking at the thread count?
 8)
CC
Cap'n Crunch aka "Al-Paca"

Offline Wade Chamberlain

  • The Beaver
  • Contributing Member
  • Member
  • ****
  • Posts: 8507

USS vs SAE?
« Reply #10 on: January 31, 2005, 06:59:26 PM »
Wile E - shortcut is right, just buy the 1020 piece set.  Don't forget metric and british threads.  Oh, and get the left handed ones too.  And bottoming taps.   8)  :lol:

Wade Chamberlain

Offline StephenP

  • Stephen Price
  • Contributing Member
  • Member
  • ****
  • Posts: 2215
    • Adelphi, MD

USS vs SAE?
« Reply #11 on: January 31, 2005, 08:00:14 PM »
Wait - be sure to add the male thread chasers as well - got to clean up them bolt holes before the new bolts are used. :D
D.B. does that mean "No Sweat"
FFR4247K 5.0 EFI, T-5, 3.08

Offline Scott Harrison

  • "Elder", "Pappy", " We do not stop playing because we grow old, we grow old because we stop playing!"― Benjamin Franklin
  • Approval Moderator
  • Member
  • ****
  • Posts: 11651
  • "Growing old is mandatory, growing up is optional"
    • Great Falls, VA
    • Cobra Inc.

USS vs SAE?
« Reply #12 on: February 01, 2005, 11:24:47 AM »
Wow, a 1020 piece set....Where can I get that! :lol:

Actually I have a set...
 
but two of the male thread restorers were broken by someone  :? (who works in my garage alot and is a lot stronger than me). Of course the two broken ones are the ones I use the most. I find these work much better than regular taps/dies for cleaning up a parts for assembly.

Ok, so now I learned some more good info:
USS= Coarse threads & have wider washers
SAE= Fine threads

OK, one more question. I assume both types of fasteners available in grade 5 and grade 8. So, assuming the same grade, which is stronger: coarse or fine? Why?
CSX 4100

Offline kellerscobra

  • Greg Keller AKA K-Mart
  • Contributing Member
  • Member
  • ****
  • Posts: 1511
    • Sterling, VA
    • Right Lane Motorsports

USS vs SAE?
« Reply #13 on: February 01, 2005, 11:37:13 AM »
Quote
OK, one more question. I assume both types of fasteners available in grade 5 and grade 8. So, assuming the same grade, which is stronger: coarse or fine? Why?


I would guess that a bolt with fine threads would have more gripping strength, since there are more threads "engaged".  The strength of the bolt would be determined by the grade.
Greg Keller
FFR 2957

RedRicer

Offline SchmidtAl

  • Captain Crunch
  • Contributing Member
  • Member
  • ****
  • Posts: 2568
    • Lake Ridge, VA

USS vs SAE?
« Reply #14 on: February 01, 2005, 08:22:50 PM »
Fine threads are stronger, not as deep I believe. You obviously didn't read the thread in 2002 where Wade calculated the breaking strength of the bolts on my clutch slave cylinder, he calculated for both coarse and fine threads. Fine threads were stonger. Maybe Tinky will bring it to the top for you.
 8)
CC
Cap'n Crunch aka "Al-Paca"
Pages: [1] 2   Go Up