Covers requirements for selected series of unified and unified miniature screw threads and gaging practice to determine conformance. The sae had issued aerospace standard as8879 revision a as a possible replacement for mil s8879c, but the. Per mil should not be confused with parts per million ppm. 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.
The dimensional inspection methods for thread characteristics are outlined in asme b1. In november 1976, the istc was terminated, and the general services. Unj thread profile inch screw threads north american. Mil s7742 screw threads, standard, optimum selected series.
Floating nut plate 2 lug fbl100214 fbl10015 series. Antiseize compund per mil a907 is added to internal thread. 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. At sizes larger than 6 you need to define the diameter and the pitch. 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. Basically stated, in most cases, if the drawing states mils8879 you are now to refer to saeas8879 for current specification details. Mils8879 cancelled by dod greenslade and company, inc. Code states that the authority for development of federal standards for procurement purposes rests with the general services administration gsa. The standards for a unj screw thread mils8879, as 8879 and iso 3161 are one of the. Basically stated, in most cases, if the drawing states mil s8879 you are now to refer to saeas8879 for current specification details. Mils8879 also only describes 3a3b class for any threads. Unj thread profile inch screw threads north american tool a. Ms2107508 ms21073 ms21075 nutplate series components datasheet pdf data sheet free from datasheet data sheet search for integrated circuits ic, semiconductors and other electronic components such as resistors, capacitors, transistors and diodes.
We are faa certified and a department of defense contractor with over 25 years experience with mil spec coatings. Mils8879 was primarily thought of and used for aerospace fastener and threaded. This military standard is approved for use by all departments and agencies of the department. The document instance shall conform to iso 8879, the. C screw threads, controlled radius root with increased minor diameter, general specification for from sai. August 12, 1997 without designating a replacement document. Mils8879 screw threads, controlled radius root with. Mil s8879 revision c as8879 latest revision mil s8879c other thread as8879 category 1 latest revision mil s8879c safety critical thread as8879 category 2 latest revision if a contract stipulates a specific version of a document other than the above, that is the version one has to use. This standard was approved by the commissioner, federal supply service, general services administration, for the use of all federal agencies. General specification for ss by mil s8879a standard by military specifications and standards, 09211960.
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. Commerce had developed and published nbs handbook h28, screwthread standards for federal services. Department of defense dod organizations may only use mils8879 for reprocurement of previously designed items. Mils7742d metalworking mechanical engineering scribd. 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. Threads per mils8879 jseries spacecraft engineering. 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. Mils8879 canceled superseded by saeas8879 the gage. I cant seem to find any stock bolts that use this thread. General specification for mil s7742 revision d current see the following. When specified, screws shall have a magnetic permeability of less than 2. Nasm25027 mil s8879 mil prf46010 pennengineering lubricant nasm25027 national aerospace standards mil s8879 a m5 selflocking nut a380 text.
The faa, on february 26, 1999, issued ac 2141 to address problems stemming from the dod inactivating mil s8879c notice 2. 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 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. Mils7742 screw threads, standard, optimum selected.
The best choice of inspection technique depends on. Mil spec hardware specification supplier mil spec hardware, aerospace fasteners. Threads per mil s8879 except in locking area and prior to lubrication. Beneficial comments recommendations, addition, deletions and pertinent data which may be of use in improving this document should be. Mil s8879 screw threads, controlled radius root with increased minor diameter, general specification for superseded by sae as8879. Part numbers sps part numbers consist of the following, nasm25027. Where i work, we call out mil standard threads per mils8879. Sae as8879 was introduced to provide an alternative to the inactive government specification mils8879 for screw threads unj profile, inches.
The sign is written, which looks like a percent sign % with an extra zero in the divisor. 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. Mil s8879 notice 3 dated 24 february 2003 states that military specification. Threads, before lubrication, are per mil s8879 for class 3b threads, and mil s7742 for, lubrication per mil s7742. Nominal size thread pitch in threads per inch thread form thread class direction multiple of. Cold working screws may not be capable of meeting permeability and strength requirements simultaneously. The status of mil s7742 is considered inactive by the department of defense.
The most simple statement is that saeas8879 has replaced mil s8879. It was derived from a military specification mil s8879. This document specifies three systems for verification of thread characteristics to ensure dimensional conformance. Mil s8879 was primarily thought of and used for aerospace. Example, with mil s8879 prior to the addition of solid film lubricant where applicable. Locking torque per nasm25027 as applicable, nondry lubricant wax type soluble in the cleaner specified in nasm25027. I have a copy of mil s8879, but the port callout for as5202 calls out a thread per as8879.
Ansiasme sae as8879 formerly mils8879 and in ansiasme b1. Per sae as8879, unj thread profiles are not interchangeable with metric. Fedstdh28 screwthread standards for federal services. 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. Controlled root radius with increased minor diameter. As stated in my original post, were this truly a 1. Where i work, we call out mil standard threads per mil s8879. Mil s8879, the resultant thread geometry is interchangeable with the thread form in as8879. Department of defense dod organizations may only use mils 8879 for reprocurement of previously designed items. Ra, sealing surfaces 63 microinches ra and as shown per ansiasme b46.
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