BATTELLE - MMPDS-16 CHAPTER 8
MMPDS-16 - Metallic Materials Properties Development and Standardization
|Publication Date:||1 July 2021|
INTRODUCTION AND FASTERNER INDEXES
- Five categories of mechanical fasteners are presently contained in this Handbook, generically defined as follows:
Solid Rivets - Solid rivets are defined as one piece fasteners installed by mechanically upsetting one end.
Blind Fasteners - Blind fasteners are usually multiple piece devices that can be installed in a joint which is accessible from one side only. When a blind fastener is being installed, a self-contained mechanical, chemical, or other feature forms an upset on its inaccessible or blind side. These fasteners must be destroyed to be removed. This fastener category includes such fasteners as blind rivets, blind bolts, etc.
Swaged Collar Fasteners - Swaged collar fasteners are multiple piece fasteners, usually consisting of a solid pin and a malleable collar which is swaged or formed onto the pin to clamp the joint. This fastener usually is permanently installed. This fastener class includes such fasteners as "Hi-Shear" rivets, "Lockbolts", and "Cherrybucks".
Threaded Fasteners - Fasteners in this category are considered to be any threaded part (or parts) that after assembly in a joint can be easily removed without damage to the fastener or to the material being joined. This classification includes bolts, screws, and a wide assortment of proprietary fasteners.
Special Fasteners - As the name implies, this category of fastener is less commonly used in primary aircraft structure than the four categories listed above. Examples of such fastening systems are sleeves, inserts, panel fasteners, etc.
In the following 3-digit sections, descriptive information is presented relative to the establishment of design allowables in joints containing these four categories of fasteners. Following each such section are the various tables of joint allowables or associated information for computing joint allowables as described.
Tables 8.1.1(a) through 8.1.1(e) are fastener indexes that list the joint allowables tables for each fastener category. These indexes are provided to make it easier to locate the allowables table for a given fastener and sheet material combination. Each of the indexes generally is similarly structured in the following manner. The left-hand column describes the fastener by referring to the NASM part number or to a vendor part number when the fastener is not covered by either series. The second column contains the table number for the allowables table for each fastener. The fastener column has been so arranged that when protruding head and countersunk head fasteners are included in a given fastener index table, the protruding head tables appear first in the second column. The third column identifies generally the base material of the fastener. Generic terms usually are used, such as steel, aluminum, titanium, etc. The fourth column identifies the specific sheet or plate material.
Table 8.1.1(f) lists fastener tables which have not been confirmed. The reason and date for removal of this data is indicated. Table 8.1.1(g) lists other alloys, not included in the Table 8.1.1(f), that have become obsolete. Table 8.1.7 contains a list of fastener tables and additional information that was removed per the Sunset Clause (Section 18.104.22.168).
It is recommended that Section 9.7 be reviewed in its entirety since it contains detailed information on the generation and analysis of joint data that results in the joint allowables tables contained in this section.