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Are 3/4" 16 UNF and 3/4" 16 UNF-2B the same thread #4443399
06/28/17 04:11 AM
06/28/17 04:11 AM
Joined: Oct 2015
Posts: 2,660
Balearic Islands , Spain
FordCapriDriver Offline OP
FordCapriDriver  Offline OP
Joined: Oct 2015
Posts: 2,660
Balearic Islands , Spain
?
Thinking of using either a Bosch, Mahle OC33 or OC42 in place of the Motorcraft EFL-90 ( 74HM 6714 AA ).


1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.
Re: Are 3/4" 16 UNF and 3/4" 16 UNF-2B the same thread [Re: FordCapriDriver] #4443410
06/28/17 04:54 AM
06/28/17 04:54 AM
Joined: Jul 2010
Posts: 18,715
PNW
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 18,715
PNW
Both are the same diameter and thread pitch. The "2B" specifies how tight the threads will fit together.

From the link: https://en.wikipedia.org/wiki/Unified_Thread_Standard

https://upload.wikimedia.org/wikipedia/commons/4/4b/ISO_and_UTS_Thread_Dimensions.svg

Tolerance classes
"A classification system exists for ease of manufacture and interchangeability of fabricated threaded items. Most (but certainly not all) threaded items are made to a classification standard called the Unified Screw Thread Standard Series. This system is analogous to the fits used with assembled parts.

Class 1 threads are loosely fitting threads intended for ease of assembly or use in a dirty environment.

Class 2 threads are the most common. They are designed to maximize strength considering typical machine shop capability and machine practice.

Class 3 threads are used for closer tolerances.

Class 4 thread fit are even tighter than a Class 3.

Class 5 fit is not a loose thread. It is a interference thread, used on items like spring shackles on an automobile.

The letter suffix "A" or "B" denotes whether the threads are external or internal, respectively. Classes 1A, 2A, 3A apply to external threads; Classes 1B, 2B, 3B apply to internal threads.

Thread class refers to the acceptable range of pitch diameter for any given thread. The pitch diameter is indicated as Dp in the figure shown above."


I'm assuming the 3/4" 16 UNF is a class 1B thread, since there's no designation at the end. A class 1 or class 2 internal thread on the filter base plate should fit fine on the filter mounting center spud.

Re: Are 3/4" 16 UNF and 3/4" 16 UNF-2B the same thread [Re: FordCapriDriver] #4443456
06/28/17 06:31 AM
06/28/17 06:31 AM
Joined: Oct 2015
Posts: 2,660
Balearic Islands , Spain
FordCapriDriver Offline OP
FordCapriDriver  Offline OP
Joined: Oct 2015
Posts: 2,660
Balearic Islands , Spain
Ok thanks.


1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.
Re: Are 3/4" 16 UNF and 3/4" 16 UNF-2B the same thread [Re: FordCapriDriver] #4443514
06/28/17 08:00 AM
06/28/17 08:00 AM
Joined: Feb 2014
Posts: 593
Margate England
Claud Offline
Claud  Offline
Joined: Feb 2014
Posts: 593
Margate England
I learned something new today. Thanks ZeeOSix.

Claud.

Re: Are 3/4" 16 UNF and 3/4" 16 UNF-2B the same thread [Re: FordCapriDriver] #4443989
06/28/17 02:39 PM
06/28/17 02:39 PM
Joined: Jul 2010
Posts: 18,715
PNW
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 18,715
PNW
Anytime ... glad to help out.

Re: Are 3/4" 16 UNF and 3/4" 16 UNF-2B the same thread [Re: FordCapriDriver] #4444651
06/29/17 08:41 AM
06/29/17 08:41 AM
Joined: Dec 2016
Posts: 6,241
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,241
Waco, TX
Most oil filters threads seem pretty "loose"...
but occasionally I run across some that are obviously a lot more snug.
I wonder if it's just poor machining/dull tooling more than anything, though.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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