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" revsionof already existing model 4081-3.  These revisions usually amounted to nothing more than a re-arrangement of the scales; the physical sizesof 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 imitationleather fiber case.  So, ignore the alphabetic prefixes and suffixes when looking for parts for you slide rule.  If yourrule 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.  Twenty-inch rules usually--but not always--use slightly different cursors from the corresponding ten-inch versions.

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.

Unfortunately we had had a rash of parts destroyed or lost using USPS 1st class, so now we have to send parts out using USPS small package with tracking in a 7x5 in bubble padded envelope. Shipping is $7 for fasteners and lens, and cursors USPS Ground. Use the PayPal button to order, with a description of what you need. Combine these items with one or more duplicate slide rule adoptions. Note: If the OEM glass lens or cursor blocks are shown as "N.A." (not available), we a variety of Replica Laser cut acrylic lens $5 blanks or $10 if I add the hairline or have too hand fabricate a lens.

• Small parts, like cursors and blocks: Unfortunately we had had a rash of parts destroyed or lost using USPS 1st class, so now we have to send parts out using USPS small package with tracking in a 7x5 in bubble padded envelope. Shipping is $7 for fasteners and lens, and cursors USPS Ground. Combine these items with one or more duplicate slide rule adoptions.
• For slide rules look at the Duplicates page. Click on the comparable image or its accession number to see the matching slide rule in the ISRM archives.
• The one selected and the one you will receive is a duplicate of this image, and in most cases is in better condition (exceptions noted).
• Description of NOS = New Old Stock or NIB = New In Box.
• If you desire an original manual (as available) include an extra $10. It may not be the exact model year.
• If you want a photo of your selected slide rule before ordering, send us an email or we can text it to your phone.
• When you make a PayPal donation, list the Accession #s of the items you want..
• For every $100 gifted select a $10 slide rule from the list to throw in the stack for free.
• A single slide rule costs $8 to ship. 5 slide rules cost $12. Shipping will be combined .Currently USPS is wanting $16 for a Priority Mail medium Flat Rate box. (holds up to 20 slide rules, without sleeves).
• Make a reasonable offer. Most suggested fees are based on averaging past ebay prices over the last two years..
• All proceeds go to supporting ISRM.
• You can deduct your monetary gift that is in excess above the recommended fee on your U.S. taxes.
• Satisfaction guaranteed.
  

The Secure Donations button allows you to direct your donation to the following ISRM programs.

• Slide Rule Sales/Adoption Fees
• Gift from Friends of the Museum
• Free File Downloads Gratuity
• Cash Gift - New ISRM Friend
• School Loaner Program Support

Use the secure button, and include a donation for shipping costs List the items by ISRM reference #. in the message to curator.