Howmet Fastening Systems
Howmet Fastening Systems
Phone: Sales +1 800 992 4444
Technical Support +1 310 784 6409
Email: HFSTechSupport@howmet.com
Website: www.hfs.howmet.com
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MATERIAL: Non magnetic, heat and corrosion resistant steel ( A286.) per AMS-5525, 5735 or 5737

FINISH : Silver Plate, AMS 2410.

PERFORMANCE : Torque per NASM 25027.

THREADS: In accordance with AS-8879 before lubrication.

MARKING: Only ø - 3 and - 4 : SD + letter C on the area indicated on the drawing.

APPLICATION : Type DA, DB and DC parts are particularly suited for use in applications involving installations in thin Aluminum or soft steel sheets or plates having small mounting areas making the use of a miniature fixed type nut desireable. The adaptability of two shaft lengths to many sheet thicknesses is worth of note since it minimizes nut stocking requirements for numerous applications.

MOUNTING RECOMMENDATIONS
  • Respect carefully the installation hole diameter tolerance.
  • The nut and installation hole diameter axis must be perpendicular to the sheet surface.
Unit of Measure

Specifications

A ±0,10

 N/A 0.391 Inch

C ±.002

 N/A 0.316 Inch

D - MAX

 N/A 0.260 Inch

D - MIN

 N/A 0.255 Inch

F ±.003

 N/A 0.040 Inch

G - REF

 N/A 0.297 Inch

H - MAX

 N/A 0.224 Inch

M - REF

 N/A 0.040 Inch

V ±.005

 N/A 0.040 Inch

Q - Hole Diameter

 N/A 0.311-0.313 Inch

R

 N/A 0.419 Inch

S +.000 / -.002

 N/A 0.308 Inch

T

 N/A 0.391 Inch

U +.003 / -.000

 N/A 0.307 Inch

Approx. Weight

 N/A 0.230 lb/100

Thread Type

 N/A Unified

Configuration 1

 N/A Clinch

Configuration 2

 N/A Fixed

Lock

 N/A Crimp Lock

Simplified Material

 N/A CRES

Strength

 N/A 125KSI - 900Mpa

Temperature

 N/A 800°F - 425°C

Thread

 N/A 0.2500-28 UNJF-3B