The
Apprentices Association,
Royal
Small Arms Factory, Enfield.
Threads
used on Lee-Enfield Rifles
Threads used on rifles from the Lee-Metford up to the SMLE Mark 5, conform
to the Enfield Thread Standard. This was a standard set by the Royal Small
Arms Factory, due to the fact that no other standards existed. Another
contributory factor was that the threads had been "inherited" from
previous models of rifle, probably dating back to the Pattern '53..
The table has omissions, more work has yet to be done. I am working in
conjunction with the MoD Pattern Room, Leeds, UK. who are carrying out
separate, but related work. When completed the final "output"
should be of use to all "Enfield enthusiasts".
The "Enfield Thread Form" appears not to be consistent, varying
between different examples of threads per inch. The forms have been established
as far as possible. This work was carried out by the MoD Pattern Room. At the
moment there is no intention of publishing the forms, at least not until they
have been established beyond reasonable doubt.
Not all the threads shown below are "Enfield". With the SMLE
Mark VI, came the use of "British Association" threads or BA as
they are known. Although now obsolete, tooling for BA threads can still be obtained. Some
threads on Enfield rifles are in fact Whitworth form, ie. BSW and BSF.
I am indebted to Ian Skennerton, who gave permission to use the component
references from his "Small Arms Identification Series".
There are bound to be errors in this data, users do so on their own
responsibility.
Components shown for Rifles No5 and No8 are those that differ from Rifle
No4
The Association motto: Ex Tenebris per Ignem ad Lumen - "From
darkness, through the fire, into the light". A representation on the
process of learning. From the darkness of ignorance, through the fire of
education, into the light of knowledge.
"Enfieldlock"
Contact me
|
Amended 11 July 2004
Carbine,
Magazine Lee Enfield
|
Component
|
SAIS
Ref
|
Thread used
|
Remaks
|
Screw,
swivel piling
|
D59
|
|
MLM
Rifle, Marks I & I*
For sling swivel moved to lower band
|
Screw,
cover breech bolt
|
C11
|
.084dia
x 57tpi
|
Mark
I & I*
|
Screw,
band lower
|
D23
|
.181dia
x 26-1/3tpi
|
MLM
Carbine.
MLE Carbine, all marks.
|
Screw,
cover backsight
|
D28
|
|
Wood
Screws
Long and short, 1 off each.
MLM Carbine.
MLE Carbine, all marks.
|
Screw,
cap nose
|
D26
|
.1875dia
x 33tpi
|
MLM
Carbine.
MLE Carbine, all marks.
|
Martini-Henry/Enfield
(All models)
|
Screw
Sight Bed
|
N/A
|
.144dia
x 37tpi
|
|
Screw
Keeper Stop Nut
|
N/A
|
.114dia
x 49tpi
|
|
Screw
Nose Cap
|
N/A
|
.1875dia
x 33tpi
|
|
Screw
Swivel Nose Cap
|
N/A
|
.181dia
x 26-1/3tpi
|
|
Screw
Sight Cap
|
N/A
|
.084dia
x 57tpi
|
|
Screw
Spring Sight
|
N/A
|
.144dia
x 37tpi
|
|
Rifle
Magazine Lee Enfield
|
Screw,
cap nose
|
D21
|
.1875dia
x 33tpi
|
MLM
Rifle, all marks.
MLE Rifle, all marks.
CLLE.
|
Screw,
guard trigger front
|
D48
|
.25dia
x 30tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Screw,
dial sight
|
D56
|
.181dia
x 26-1/3tpi
|
MLM
Rifle, all marks.
MLE Rifle, all marks.
CLLE.
|
Screw,
dial sight pivot
|
D58
|
.1656dia
x 37tpi
|
MLM
Rifle, all marks.
MLE Rifle, all marks.
CLLE.
|
Screw,
strap butt plate
|
D84
|
.1656dia
x 37tpi
|
Smaller
size, early ones brass.
MLM Rifle, Marks II & II*.
MLE Rifle, all marks.
CLLE.
|
Screw,
band lower
|
D05
|
.181dia
x 26-1/3tpi
|
MLM
Rifle, Mark II & II*.
MLE Rifle, all marks.
CLLE.
|
Screw,
extractor
|
C20
|
.126dia
x 42tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Screw,
cap backsight
|
B23
|
.084dia
x 57tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Screw,
spring backsight
|
B13
|
.144dia
x 37tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Screw,
sear
|
A22
|
.1745dia
x 50tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Screw,
aperture sight
|
A19
|
.1656dia
x 37tpi
|
MLM
Rifle, all marks.
MLE Rifle, all marks.
CLLE.
|
Screw,
spring sight aperture
|
A18
|
.1656dia
x 37tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle, all marks.
CLLE.
|
Screw,
ejector
|
A15
|
.1656dia
x 37tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Screw,
cut-off
|
A13
|
.114dia
x 49tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Screw,
keeper striker
|
C26
|
.126dia
x 42tpi
|
MLM
Rifle Mar II* & Carbine.
MLE Rifle & Carbine, all marks.
CLLE.
For cocking piece with safety catch,1/16" shorter than for Mk1*
|
Bolt,
stock #1
|
D71
|
7/16"
BSW (14tpi)
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Bolt,
stock #2
|
D72
|
7/16"
BSW (14tpi)
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE. Squared end.
|
Screw,
spring trap butt-plate
|
D81
|
.1656dia
x 37tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Screw,
plate butt
|
D83
|
|
1.5-in
x 18 gauge wood screw. Countersunk-raised head.
MLM Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Screw,
trigger guard back
|
D49
|
.144dia
x 37tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Screw,
swivel piling
|
D60
|
.181dia
x 26-1/3tpi
|
MLM
Rifle, Marks II & II*.
MLE Rifle, all marks.
CLLE.
|
Striker
|
C23
|
.25dia
x 30tpi
|
Also
LMR II*, LER I &I* and all Carbines
|
Screw,
bed backsight
|
B11
|
.144dia
x 37tpi
|
MLM
Rifle & Carbine, all marks.
MLE Rifle & Carbine, all marks.
CLLE.
|
Rifle
Magazine Lee Metford
|
Screw,
head breech bolt
|
C16
|
.25dia
x 30tpi
|
Mark
I & I*
|
Screw,
spring cut-off
|
A10
|
.1656dia
x 37tpi
|
Mark
I & I*
|
Striker
|
C22
|
.25dia
x 30tpi
|
Marks
I, I* & II
|
Screw,
keeper striker
|
C25
|
.126dia
x 42tpi
|
Mark
I, I* & II
|
Screw,
swivel trigger guard
|
D40
|
.114dia
x 49tpi
|
MLM
Rifle, Mark I & I*
|
Screw,
band lower
|
D19
|
|
MLM
Rifle Mark I & I* & Carbine.
MLE Carbine.
|
Screw,
band upper
|
D13
|
|
MLM
Rifle, Mark I & I*
|
Rifle
No 1 Mark 1
|
Screw
windage backsight Mk1
|
N/A
|
.125dia
x 20tpi double start
|
|
Screw
Charger Retaining
|
N/A
|
.126dia
x 42tpi
|
Also
.1745dia x 50tpi for earlier models
|
Screw,
backsight bed
|
N/A
|
|
2
off. Not listed in SAIS.
|
Screw,
Backsight Protector, Top
|
N/A
|
096dia
x 56tpi
|
|
Screw,
Backsight Protector, Side
|
N/A
|
096dia
x 56tpi
|
|
Rifle
No 1 Mark 5
|
Screw
Stop Slider Backsight
|
N/A
|
.096dia
x 56tpi
|
|
Screw
Upper band
|
N/A
|
.1875dia
x 33tpi
|
Repro
versions can use 2BA or 4.5m (non preferred thread)
|
Rifle
No 1 Mark III & III*
|
Screw,
cap, nose, front
|
B15
|
.1875dia
x 33tpi
|
Later
examples have larger head and wider slot.
|
Screw,
extractor retaining
|
A45
|
.126dia
x 42tpi
|
|
Striker
|
A49
|
.25dia
x 30tpi
|
Whitworth
form?
|
Screw,
striker retaining
|
A50
|
.144dia
x 37tpi
|
Two
types:
- Domed, wide slot
- Flat head, narrow slot.
|
Screw,
guard, trigger, back
|
B27
|
.144dia
x 37tpi
|
Also
longer version for attaching aperture sights. Commercial sources.
|
Screw,
cap, nose, back
|
B14
|
.1875dia
x 33tpi
|
|
Screw,
piling swivel
|
B17
|
.1875dia
x 33tpi
|
|
Screw,
butt-trap spring
|
B49
|
.1656dia
x 37tpi
|
|
Screw,
cap, handguard, front
|
B20
|
.096dia
x 56tpi
|
|
Screw,
bayonet grip
|
C09
|
.1656dia
x 37tpi
|
Later
spares use 3BA
|
Screw,
backsight protector
|
B33
|
.1875dia
x 33tpi
|
Counter
sunk m/c screw
|
Screw,
cut-off
|
A36
|
.114dia
x 49tpi
|
All
marks bar MarkIII*
|
Screw,
trigger guard, front
|
B28
|
.25dia
x 30tpi
|
|
Screw,
outer band
|
B11
|
.1875dia
x 33tpi
|
|
Screw
Windage Backsight No1
|
N/A
|
.17dia
x 46dia
|
On
Mk III only and some re-worked III*.
|
Screw,
sear
|
A39
|
.1745dia
x 50tpi
|
|
Screw,
ejector
|
A37
|
.1656dia
x 37tpi
|
2
lengths - .205 (obsolescent), .23 current
|
Screw,
catch,slide,backsight
|
A20
|
.1875dia
x 33tpi
|
|
Bolt
Bayonet Patt 1907
|
C4
|
.181dia
x 26-1/3tpi
|
|
Screw,
dial sight fixing
|
NA
|
.181dia
x 26-1/3tpi
|
Different
ot P14
|
Screw,
sling swivel rear
|
B43
|
.1875dia
x 33tpi
|
|
Bolt,
Stock
|
B36
|
7/16"
BSW (14tpi)
|
|
Bolt
Head
|
A47
|
.4175dia
x 20tpi
|
75-78deg,
incl flank angle. Enfield form.
|
Screw,
cap, backsght
|
A13
|
.1656dia
x 37tpi
|
|
Screw,
back sight spring
|
A25
|
.144dia
x 37tpi
|
|
Screw,
inner band
|
A03
|
.1875dia
x 33tpi
|
|
Screw,
safety catch spring
|
A33
|
.1656dia
x 37tpi
|
|
Rifle No1 Mark 6 |
Screw,
Cut-off
|
N/A
|
4BA
|
Differs from previous marks.
|
Rifle
No 3 (P14)
|
Screw,
axis
|
D09
|
.096dia
x 56tpi
|
1.18
o/all length
|
Screw,
nose cap
|
C05
|
.1656dia
x 37tpi
|
|
Screw,
axis, backsight
|
A07
|
.096dia
x 56tpi
|
|
Screw,
stop backsight
|
A13
|
.084dia
x 57tpi
|
|
Screw,
backsight spring
|
A15
|
.144dia
x 37tpi
|
|
Screw,
catch bolt locking
|
B05
|
.12dia
x 48tpi*
|
|
Screw,
axis
|
B14
|
.126dia
x 42tpi
|
|
Screw,
front band
|
C03
|
.1875dia
x 33tpi
|
Common
to SMLE
|
Screw,
dial sight fixing
|
C30
|
.1656dia
x 37tpi
|
Different
to SMLE
|
Screw,
piling swivel
|
C07
|
.1875dia
x 33tpi
|
|
Screw,
back, trigger guard
|
C15
|
.25dia
x 30tpi
|
|
Screw,
front, trigger guard
|
C16
|
.25dia
x 30tpi
|
|
Screw,
volley dial sight
|
C30
|
.1656dia
x 37tpi
|
|
Screw,
fine adjustment.
|
D07
|
.088dia
x 36tpi*
|
|
Screw,
stop sight
|
D15
|
.084dia
x 57tpi
|
|
Screw,
back sight leaf
|
D17
|
.144dia
x 37tpi
|
2.0
o/all length
|
Screw,
catch bolt locking
|
D22
|
.12dia
x 48tpi*
|
As
per B5
|
Screw,
butt-trap spring
|
C38
|
.1656dia
x 37tpi
|
|
Rifle
No 4 Mark 1, 2, 1/2
|
Screw,
blade foresight
|
B07
|
|
|
Screw,
guard trigger back
|
E26
|
4BA
|
Also
for Rifle No 5
|
Bolt
head
|
C27-30
|
.4375dia
x 20tpi
|
Also
for Rifle No 5
|
Screw,
foresight guard
|
E15
|
4BA
|
|
Screw,
band
|
A50
|
2BA
|
|
Bolt,
stock
|
D09
|
7/16"
BSW (14tpi)
|
Also
for Rifle No 5
|
Screw,
swivel butt
|
D12
|
2BA
|
|
Screw,
guard trigger front
|
E27
|
1/4"
BSF (26tpi)
|
Also
for Rifle No 5
|
Screw,
catch magazine
|
E24
|
4BA
|
Also
for Rifle No 5
|
Striker
|
A49
|
1/4"
BSF (26tpi)
|
|
Screw,
striker retaining
|
C15
|
4BA
|
Also
for Rifle No 5
|
Screw,
extractor retaining
|
C14
|
5BA
|
Also
for Rifle No 5
|
Screw,
swivel, front
|
A41
|
2BA
|
Also
for Rifle No 5
Also for SMLE
|
Screw, ejector
|
E25
|
3BA
|
Also
for Rifle No 5
Long version available for securing target aperture sights. AJ Parker product.
|
Screw,
spring bolt locking
|
E29
|
3BA
|
Also
for Rifle No 5.
|
Rifle
No 5 Mark 1
|
Screw,
retaining butt-cap
|
B03
|
4BA
|
|
Bolt,
stock
|
E08
|
7/16"
BSW
|
Lightened
version, interchangeable with No4
|
Screw,
bayonet grip
|
F13
|
3BA
|
|
Screw adjusting, backsight
|
A07
|
|
Unique
to the No5, according to SAIS.
|
Rifle
No 8 Mark 1 |
Nut,
Trigger setting
|
N/A
|
|
|
Screw,
Clamping, Foresight
|
N/A
|
6BA
|
|
Screw,
Locking, Pull-off
|
N/A
|
|
|
Screw,
Pressure setting
|
N/A
|
|
|
Screw,
Trigger setting
|
N/A
|
|
|
Screws,
Butt plate (2)
|
N/A
|
|
Wood
screws
|
Screws,
Catch, Bolt head, Retaining plate (2)
|
N/A
|
|
|
|