Go Green and Save Green!

When selecting finishes, select the RoHS compliant finishes. They are better for the environment and less expensive!


Quarter Turn - SU-2300 Line

U. S. A. Flag
Manufactured in
the United States of America!

On-Line Product Selector
to assist in selecting
DFCI Fasteners
(your browser must support JavaScript)

SU-2300 Product Picture

SU-2300 Line Fasteners are designed for aircraft use and are specified on external access panels and internal equipment.

They are also specified on demanding non-aircraft applications, where their special qualities of vibration endurance and limited sheet separation under overload are needed, or where an enclosed or floating receptacle is required.

SU-2300 Line Fasteners are approved under MIL-F-5591C* for all sizes, sizes 2, 5, and 7, all stud types, types 1, 2, and 3, Class A floating and Class B rigid receptacles, and for the installation holes and stud retainers covered by styles 1 and 2.

SU-2300 Line studs are made of a higher-tensile alloy steel than ST-1200 Line studs. Also, they are available in .030" increments which reduces the extent of sheet separation in case of tensile overload.

SU-2300 Line Fasteners are offered in three sizes:

Stud Size Head Diameter Shank Diameter Clamping Tension
inch mm inch mm
35 3/8 9.53 7/32 5.56 15 lb
5 9/16 14.29 5/16 7.95 35 lb
6 5/8 15.88 3/8 9.53 50 lb

Standard Materials: Hardened carbon steel studs, carbon steel wings


Zinc Trivalent Clear .0003 thick. Trivalent Chromate Clear with Sealer (RoHS Compliant)
Specification(s): ASTM-B-633, Type III, SC 2, Clear
Suffix: -Z3CT

The above mentioned finish will be supplied as the standard finish upon depletion of existing stock which are finished as follows:

Cadmium Electroplated .0003 thick, Clear Chromate (Obsolete)
Specification(s): QQ-P-416, TYPE I, CLASS 2, CLEAR
Suffix: -C3C

Selection Procedure

  • Select the appropriate fastener size using this performance table:
    Size AN 7 5 2
    Size DFCI 6 5 35
    Locking Torque - Minimum (in-lb) 7.5 5.0 3.5
    Locking Torque - Maximum (in-lb) 18 12 8
    Initial Tension Minimum (lb) 50 35 15
    Tension & Shear - Rated (lb) 700 500 200
    Tension & Shear - Plus 50% (lb) 1050 750 300
    Locking Stop Strength (in-lb) 80 60 30
    Endurance (Cycles) 40,000 25,000 5,000
  • Select a stud head style: Oval (2xx1), Flush (2xx6), or Oval Wing (2xx1-W)
  • Select a stud retainer: There are 4 types of retainers available in the SU-2300 Line:
Half Grommet
Solid. Retains when flattened.
Snap Ring
Split ring installs fast and takes little space.
Retaining Spring
  Holds the stud in the locking position for alignment with the receptacle.
Full Grommets
(1271, 1276)
Sizes 5 and 6 Prevents panel hole wear, protects the panel finish, and reduces stud play.
  • Determine the total thickness of the material to be fastened: Assuming the stud and receptacle are in a locked position, determine the distance between the level of the stud head contact with the top of the panel in which it is retained (on a flush head, this will be the top of the head), and the level of receptacle contact with the underside of the material on which it is mounted. Usually this distance is simply the combined thickness of the stud panel and receptacle support material, but gaskets or standoffs between the panel and support can also add space. Material between the stud head and the top of the panel, such as a full grommet, must also be counted, as must paint thickness applied to every intervening surface. Do not count the stud retainer thickness on the panel underside which enters the support hole.
  • Determine the correct stud length for the total thickness of material to be fastened, using the table on the stud page (Size 35, Size 5, Size 6).
  • Choose either a rigid or a floating receptacle. SU-2300 Line receptacles are enclosed to protect the parts, prevent the loss of plating chips and to provide a smooth stud entry. Type "2xx0-18" is used for rigid mounting and type "2xx0-18F" provides a floating feature to compensate for misalignment.

* Meets the design, physical and performance requirement of MIL-F-5591C. However, full mechanical properties testing may not be performed on each production lot.