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The Threads used for Lee-Enfield Rifles

With acknowledgement to, and as listed by, the Apprentices Association of the Royal Small Arms Factory originally at Enfield Lock

Ex Tenebris per Ignem ad Lumen

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

 

 

 

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