Triumph Unit construction models, engine and frame number information 1950 on

Engine & frame numbers for Triumph twin and single cylinder unit construction classic Triumph motorcycles.

I have compiled a series of tables to show the generally accepted information on the engine and frame numbers for Triumph motorcycles. This table shows data quite a few models. They are generally known as the unit models.

Unit & Pre-unit Triumph models including Terrier, Tiger Cub, Twenty One, T100, T90, 3TA, 5TA, T110, Bonneville, TR5, TR6 & Others, 1950 on

Year(s) T15 Terrier / T20 Cub Unit 350/500cc Pre-unit 500/650cc Unit 500/650cc
1950 1001N to 1616ON
1951 101NA to 15808NA
1952 15809NA to 25000NA (then) 25000 to 32303 (no suffix)
1953 32304 to 44821 (no suffix)
1954 101 to 8517 44822 to 56699 ( no suffix)
1955 8518 to 17388 56700 to 70929 (no suffix)
1956 17389 to 26275 70930 to 82797 (then)0101 to 0944
1957 26276 to 35846 H101 to H760 0945 to 011165
1958 35847 to 45311 H761 to H5484 011166 to 020075
1959 45312 to 59359 H5485 to HI 1511 020076 to 029633
1960 59360 to 69516 H11512 to H18611 029634 to 030424 (Twin down tube frame)
1960 (then) D101 to D7726
1961 69517 to 81889 H18612 to H25251 D7727 to D15788
1962 81890 to 88346 H25252 to H27932 D15789 to D20308 (Unit construction engines)
1963 88347 to 94599 H27933 to H32464 DU101 to DU5824
1964 94600 to 99719 H32465 to H35986 DU5825 to DU13374
1965 99720 onwards H35987 to H40527 DU13375 to DU24874
1966 101 onwards (Now Bantam Cub – BSA) H40528 to H49832 DU24875 to DU44393
1967 H49833 to H57082 DU44394 to DU66245
1968 H57083 to H65572 DU66246 to DU85903
1969 H65573 to H67330 DU85904 to DU90282
1969 (then) XC06297to HC24527 mid-’69 number change (then) NC00100 to HC24346 mid-’69 number change
1970 HD27850 to KD60280 JD24848 to ND60540
1971 KE00001 to HE25250 NE01436 to HE30869
1972 JG32303 to GG59646
1973 JH15597 to DH31460 JHI5101 to GH36466
1974 HJ56408 to JJ58103 JJ58014 to NJ60061
1975 DK61000 to GK62248
1976 HN62501 to GN72283
1977 GP73000 to JP84931
1978 HX00100 to JXI0747
1979 HA11001 to PA24608
1979 XB24609 to 24790 XB date code used in error, should be XA XB24609 to XB24790
1980 PB25001 to KB275
1981 KDA28001 to DDA29427
1982 EDA30001 to BDA31693
1983 BEA33001 to AEA34389
1984 not available
1985 FN000002 to FN000191
1986 GN000192 to GN000788
1987 HN000789 to HN001176
1988 JN001177 to JN001258

NOTE: From 031701 (zero prefix added) October 10,1981 thru 032213 January 1, 1983 motorcycles for
U.S. market were prefixed ‘CM’ with no date code.
This was done to overcome some export restrictions. The dating could have caused problems at the time.

If you are looking for a Triumph part, it may be worth looking at this page for 1960’s models and this page for 1970’s bikes. If I have anything, that’s where it will be. You will need to look for the Triumph parts among the other early parts.

If you are looking to sell, or seeking a specific part, let me know here. I will do my best to help.