Basically stated, in most cases, if the drawing states mils8879 you are now to refer to saeas8879 for current specification details. I cant seem to find any stock bolts that use this thread. Example, with mil s8879 prior to the addition of solid film lubricant where applicable. General specification for mil s7742 revision d current see the following.
We are faa certified and a department of defense contractor with over 25 years experience with mil spec coatings. The basic thread profile data used in those calculations should also be specific to the unj thread form table 1, pages 16 and 17, of mil s8879 for threads per mil s8879. Threads, before lubrication, are per mil s8879 for class 3b threads, and mil s7742 for, lubrication per mil s7742. Unj thread profile inch screw threads north american tool a.
August 12, 1997 without designating a replacement document. Department of defense dod organizations may only use mils8879 for reprocurement of previously designed items. As stated in my original post, were this truly a 1. Sae as8879 was introduced to provide an alternative to the inactive government specification mils8879 for screw threads unj profile, inches. Mil s8879 was primarily thought of and used for aerospace. At sizes larger than 6 you need to define the diameter and the pitch. In november 1976, the istc was terminated, and the general services. Mil s7742 rev d 25jul1991 mil s7742 rev d amendment 1 02sep1992 general specification for screw threads, standard, optimum selected series summary of how mil s7742 relates to thread gages. C screw threads, controlled radius root with increased minor diameter, general specification for from sai. Per sae as8879, unj thread profiles are not interchangeable with metric. Mil s7742 screw threads, standard, optimum selected series. The faa, on february 26, 1999, issued ac 2141 to address problems stemming from the dod inactivating mil s8879c notice 2. This standard was approved by the commissioner, federal supply service, general services administration, for the use of all federal agencies.
Floating nut plate 2 lug fbl100214 fbl10015 series. Threads per mil s8879 except in locking area and prior to lubrication. Mils8879 screw threads, controlled radius root with. Mils8879 canceled superseded by saeas8879 the gage. Controlled root radius with increased minor diameter. The document instance shall conform to iso 8879, the. Mils8879 was primarily thought of and used for aerospace fastener and threaded. Threads per mils8879 jseries spacecraft engineering. Threads, before lubrication, are per mil s8879 for class 3b threads, and mil s7742 for, nondry lubricant wax type soluble in the cleaner specified in nasm25027. Ra, sealing surfaces 63 microinches ra and as shown per ansiasme b46.
Fedstdh28 screwthread standards for federal services. The standards for a unj screw thread mils8879, as 8879 and iso 3161 are one of the. Cage code 83324 rosan fairchild fastener division, 3 west harvard street, santa ana, ca 92704 2 rf9500504 series rosan part number sae ident number tube od ref a thread mil s8879 class3b b thread mil s8879 class3a. General specification for ss by mil s8879a standard by military specifications and standards, 09211960. Antiseize compund per mil a907 is added to internal thread. Locking torque per nasm25027 as applicable, nondry lubricant wax type soluble in the cleaner specified in nasm25027. Commerce had developed and published nbs handbook h28, screwthread standards for federal services. The sign is written, which looks like a percent sign % with an extra zero in the divisor. Mil s8879c general specification for screw threads with controlled radius root and increased minor diameter dated 25 july 1991, and amendment 1 dated 2 september 1992 are hereby canceled. Department of defense dod organizations may only use mils 8879 for reprocurement of previously designed items.
The dimensional inspection methods for thread characteristics are outlined in asme b1. Coverage includes applicable documents, miniature thread designation, basic thread data, pitch diameter, taper, incomplete threads, lead threads, runout, surface roughness, responsibility for inspection, lot quantities, and inspection methods. Mils8879 cancelled by dod greenslade and company, inc. Basically stated, in most cases, if the drawing states mil s8879 you are now to refer to saeas8879 for current specification details. Where i work, we call out mil standard threads per mils8879. Nominal size thread pitch in threads per inch thread form thread class direction multiple of. Complete document screw threads, controlled radius root with increased minor diameter, general specification for includes all amendments and changes through cancellation notice 3, february 24, 2003. The best choice of inspection technique depends on. The most simple statement is that saeas8879 has replaced mil s8879.
Covers requirements for selected series of unified and unified miniature screw threads and gaging practice to determine conformance. Unj thread profile inch screw threads north american. The sae had issued aerospace standard as8879 revision a as a possible replacement for mil s8879c, but the. It was derived from a military specification mil s8879. Mil spec hardware specification supplier mil spec hardware, aerospace fasteners. Mils8879 also only describes 3a3b class for any threads. The status of mil s7742 is considered inactive by the department of defense. This sae aerospace standard as specifies the characteristics of the unj profile inch series of screw threads, to include a mandatory controlled radius of 0. Mil s8879 screw threads, controlled radius root with increased minor diameter, general specification for superseded by sae as8879. Where i work, we call out mil standard threads per mil s8879. Mils7742 screw threads, standard, optimum selected. Part numbers sps part numbers consist of the following, nasm25027. Per mil should not be confused with parts per million ppm.
Cold working screws may not be capable of meeting permeability and strength requirements simultaneously. Mil s8879 notice 3 dated 24 february 2003 states that military specification. Glf fastener distributorsupplies mil spec hardware and mil spec fasteners to the navy and department of defense including mil spec screws and mil spec bolts and aerospace fasteners. Nasm25027 mil s8879 mil prf46010 pennengineering lubricant nasm25027 national aerospace standards mil s8879 a m5 selflocking nut a380 text. A per mille from latin per mille, in each thousand, also spelled per mil, per mill, permil, permill, or permille is a sign indicating parts per thousand. When specified, screws shall have a magnetic permeability of less than 2. Code states that the authority for development of federal standards for procurement purposes rests with the general services administration gsa. This document specifies three systems for verification of thread characteristics to ensure dimensional conformance. Beneficial comments recommendations, addition, deletions and pertinent data which may be of use in improving this document should be. Mil s8879, the resultant thread geometry is interchangeable with the thread form in as8879. Ansiasme sae as8879 formerly mils8879 and in ansiasme b1. Mils7742d metalworking mechanical engineering scribd. This military standard is approved for use by all departments and agencies of the department.