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Decoding LR Fastener Part Numbers

Modern LR part numbers for fasteners fall into a pattern which may be decoded to find a detail description for the partů

The list below represents the detail as best I can find out, of how the Land Rover part numbering system details nuts, bolts and washers. If you find any errors, exceptions, or have any additions please let me know

e.g. P/No. BT606101L Description : GearBox Bolt

Part TypeThreadSizeLengthFinish Unknown






BT = Bolt6 = UNFIn 16ths of an inch for imperial sizes.x 1/8 inch for imperial.0 = Bare or Natural
BX = Bolt (H.T.)5 = UNC

Reads directly for metric sizes (e.g. 06 = M6)

x 1mm for metric, except Bolts are x5mm

1 = Zinc Passivated
SX = Screw (H.T.)

4 = Whitworth

2 = Nickel / Chrome (external use)

SH = Screw

1 = Metric

3 = Nickel Chrome (internal use)
FS = Screw, Flange Head

4 = Black (internal use)
WL = Washer, Spring

5 = Black (external use)
WA = Washer, Plain

6 = Black Phosphate for controlled torque
WC = Washer, Plain

7 = Zinc (severe environment)
WM = Washer, Spring

8 = Black stainless
NT = Nut, Thin

NH = Nut, Hex

FN = Nut, Flanged

NZ = Nut, Nyloc

FX = Nut, Flanged

FX Details unknown - Jam Nut for Exhausts?, Metric??
NY = Nut, Nyloc, Flanged?
TE = Stud, Threaded, UNF at one end.

TE5 are UNC/UNF, TE6 are UNF/UNF, TE1 unknown
TD = Stud, Threaded

TD Details unknown, works with FX nuts

Thanks to JonU for thieving this info for his website. I liked his formatting better than mine so I stole it and put it back on here

From Martin Robey Engineering Ltd. it appears that this list can now be extended. The numbering scheme is the general British Leyland system, and more information is available here