THE SLIDE RULE TRADING CO., Paul Ross
Parts for Keuffel and Esser Slide Rules

Model Numbers: Keuffel & Esser slide rule model numbers often have alphabetic prefixes and suffixes.  For example "N4081-3" indicates a "new" revsion of already existing model 4081-3.  These revisions usually amounted to nothing more than a re-arrangement of the scales; the physical sizes of models with and without the "N" are absolutely identical.  Any case or cursor that fits a model without the "N" will also fit the model with the "N."  The "N" was usually dropped after couple of years when people had gotten used to the new scale arrangement.
    The suffix indicated what kind of case the rule came in.  4081-3S (and N4081-3S) came in a sewn leather case.  4081-3F came in an imitation leather fiber case.  So, ignore the alphabetic prefixes and suffixes when looking for parts for you slide rule; if your rule is marked "N4093-3F," just look for model 4093-3.
    The -1 or -3 or -5 in the model number does make a difference.  "-1" indicated a "five-inch" rule; "-3" a ten-inch rule and "-5" a 20-incher.  Longer rules were usually--but not always--thicker; different lengths usually require different cursors.

Quantities are limited (sometimes only one).  USED ITEMS HAVE BEEN CLEANED AND RECONDITIONED.  If what you need is not available check back later; maybe we'll find one somewhere.  Email us if you need something not on this list or if you're not sure what you need.
 Fits  Item Part No. Price
4158, 68-1892, K-12 Prep  Complete Cursor. Pic
M6
$15 New
4097, 4097B, 4097C, 4097D, 4098  Complete Cursor. Pic
N2
Not available
4056, 4058, N4058W Complete Cursor. Pic
M2
$25 Used
4181-1(C), E4181J, 68-1261, 68-1282, 68-1287  Complete Cursor.  Pic
 XW
$50 New
Cursor Window Only. Pic
12W
$14 New
1-1/8" wide, Closed Body:  4035, 4041, 4045, 4051, 4053-2, 4053-3, 4053-5, 4054, 4055, 4094, 4100, 4101, 4143, 4165, 68-1486,  68-1607, 68-1612, 68-1617, 68-1622, 68-1775.  Cursors for these rules also fit the rules in the next group below but are wider.  Window is 2.5 cm (about 1 inch) from left to right. Complete Cursor. Pic
EL
$35 Used
Complete cursor for rules with K scale (3 cycles) on bottom edge.
EL-B
Not availalbe
Cursor Window Only. Pic
4L
$14 Used
1-1/8" wide, Closed Body:  4045, 4051, 4054, 4055, 4094, 4096(Metal), 4100, 4101, 4143, 4165, 4045S, 4051S, 4053-2, 4053-3, 4053-5, 4168, 4168C, 9068, 10000, 10002, N4035, N4041, N4094, N4100, N4101.  Fits rules in preceding group but cursor is narrower.  Window is 1.8 cm (about  23/32 inches) from left to right. Complete Cursor
VW
$30 Used
Cursor Window Only 
10W
$16 New
All duplex rules Cursor Screw. Pic
-
$2  Used
Body/Stator Screw. Pic
-
$5  Used
10-inch:  4041, 4100, 4100S  with frameless cursor Cursor Window (frameless)
3
$16 New 
10-inch:  4061, 4065, 4071, 4095 with frameless cursor  Cursor Window (frameless).  Pic
5
$16 New
5-inch duplex:  4088-1, N4135S, 4095-1 with frameless cursor Cursor Window (frameless)
8
$16 New
1-3/16" x 1/4" duplex rules including  4088-2, 4088-3, 4095-3 Complete Cursor. Pic
GL
$40 Used
Cursor Window Only. Pic
6L
$16 Used
$20 New
1-5/16" x 1/4" duplex rules including 4070-3, 4071-3, 4139, 68-1254, 68-1259, 68-1460, 68-1465, 68-1497, 68-1502. Complete Cursor. Pic
PL
$40 Used
Cursor Window Only. Pic 9L $16 New
Metal cursor frame. 9F $7  Used
1-5/8" x 3/16" duplex rules including 4181-3, E4181, N9081-3.  See last entry below for windows and frames. Complete Cursor.   Pic
RW
$40 Used
1-5/8" x 1/4" duplex rules including  4080-3, E4081, 4081-3, 4082-3, 4083-3, 4088-5, 4090-3, 4091-3, 4092-3, 4092-5 after 1930, 4093-3, 4095-5, 4102, 4128, 4142, 4160.   See second entry below for windows and frames. Complete Cursor. Pic
IL
$40 Used
1-5/8" x 5/16" duplex rules including 4080-5, 4081-5, 4083-5, 4088-5, 4092-5 before 1930, 4093-5.   See entry below for windows and frames. Complete Cursor.  Pic
IaL
Not Available
All 1-5/8"-wide duplex rules using RW, IL, or IaL cursors. Cursor Window Only.  Pic
7L
$16 Used
Metal Cursor Frame. Pic
7F
Not Available
5-inch  All-Plastic Decilon 5 Complete Cursor. Pic 68-2104 $60 New
Window.  Pic 68-2170 $16 new
10-inch  All-Plastic Decilon 10 Complete Cursor.  Pic 68-2105 $55 New
Window. Pic 68-2171 $16 New
4045, 4051, 4053-2, 4053-3, 4053-5,  4054, 4055, 4088-2, 4088-3, 4094, 4095, 4095-3, 4096(Metal), 4100, 4101, 4143, 4150-1, 4153-1, 4161-1, 4161-3, 4165, N4035, N4041, N4053-2, N4053-3,, N4053-5,  N4094, N4100, N4101, N4133, 68-1486, 68-1576, 68-1581, 68-1586, 68-1607, 68-1612, 68-1617, 68-1622, 68-1643, 68-1648, 68-1775, 68-1786, 68-1791 Clip-On Magnifier. Pic 4185-B $75 new
$50 used

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