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Legacy Member
Firing pin thread size
Does anyone know the thread size of the No4 firing pin and cocking piece?
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07-30-2024 06:44 AM
# ADS
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Advisory Panel
Originally Posted by
scharfschutzen63
the thread size of the No4 firing pin and cocking piece
Post number 16 in our threads here...read "Both SMLE and No4 are .250" diameter and have "fine" threads. HOWEVER: SMLE thread is 1/4" x30 TPI "Enfield Special"; No4 is 1/4" x 26."
https://www.milsurps.com/showthread.php?t=53185
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The Following 3 Members Say Thank You to browningautorifle For This Useful Post:
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Legacy Member
The No4 Striker is a standard 1/4" BSF thread with 26 tpi
Mine are not the best, but they are not too bad. I can think of lots of Enfields I'd rather have but instead of constantly striving for more, sometimes it's good to be satisfied with what one has...
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Advisory Panel
In Bubba's world that's an interference fit. 
“There are invisible rulers who control the destinies of millions. It is not generally realized to what extent the words and actions of our most influential public men are dictated by shrewd persons operating behind the scenes.”
Edward Bernays, 1928
Much changes, much remains the same.
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Thank You to Surpmil For This Useful Post:
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Legacy Member
The thread is just a pert of the story with the striker / cocking piece assembly
The tolerances on the smooth parallel internal and external mating surfaces FORWARD of the threads are,effectively ZERO.
The thread draws the striker into the cocking piece where it is retained by the locking screw.
The parallel surfaces are an interference fit. NEVER fool around with either surface. If you get ANY lateral / radial movement between the striker and the cocking piece, replace one or both if necessary..
This strict alignment and rigidity are ESSENTIAL for correct operation of the trigger system and the manual safety.
Despite the "wise words" in some "aftermarket "manuals" stripping the striker / cocking piece is ABSOLUTELY NOT "routine" user maintenance. A REAL armourer might do it of the if the striker spring force falls below spec or if there is a possibility of internal rust, (battlefield pickups or beach landing training), but not otherwise.
Lee Enfields are NOT "shake and bake" equipment.
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To add to Bruce's comments that are spot on, a loose cocking piece/striker assembly can also be soft soldered as a legit, sanctioned repair.
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