Delron Inserts400 SF Series – Snap-In, Floating Nut
Style Selection
All styles feature a .031 inch minimum radial float.
Table 1
| Size | Thread Size Per MIL-S-8879 | A Head Dia. | B Flange Dia. | C Hole Dia. |
| 440 | .1120-40 UNJC-3B | .531 | .489 | .323 |
| 632 | .1380-32 UNJC-3B | .531 | .489 | .323 |
| 832 | .1640-32 UNJC-3B | .593 | .551 | .323 |
| 1032 | .1900-32 UNJF-3B | .593 | .511 | .323 |
| 428 | .2500-28 UNJF-3B | .718 | .676 | .437 |
| 524 | .3125-24 UNJF-3B | .843 | .801 | .437 |
| 624 | .3750-24 UNJF-3B | .968 | .926 | .515 |
Part Number Selection
Consult Rosán for availability of optional materials, finishes and sizes.
Example:
Materials and Finishes:
Body: 2024-T4 or T351 Aluminum Alloy per QQ-A-225/6; Alodine per MIL-C-5541.
Cap: Brass, Cadmium plated, or Aluminum, Anodized at manufacturer’s option.
T-Nut: Options listed in Part Number Selection.
Notes:
1.Burrs permissible at knurled areas and underside of head around potting slots.
2.Tolerances, unless otherwise specified: .xxx ± .010; Angles ± 2°.
Typical Assembly
Typical Series 400 SF Snap-In, Floating Nut Insert installed in honeycomb sandwich panel. Insert is held in place by a
cured epoxy compound.
Note: For installation and tooling information, see pages 44 and 45.
Length Dash Number Selection
Select Length Dash Number from Table 2 based on the minimum full thread length required by the application. Insert
length “L” must be a minimum of .040″ less than depth of panel core (See Fig. 1).
Examples:
1. Requirements: 632 Size Non-Locking Thread, Carbon Steel, Slotted Head, Minimum Full Thread Length of .250 for a
panel with a skin thickness of .044, and an overall panel thickness of .650. From table
select: Length/-10 Skin /-4 P/N = 493 SF 632-10-4
2. Requirements: 428 Size Crimp Lock Thread, 303 CRES, Non-Slotted Head, Minimum Full Thread Length of .475 for a panel
with skin thickness of .035, and an overall panel thickness of .765. From table
select: Length /-12 Skin /-4 P/N = 465 SF 428-12-3NS
Fig. 1
Minimum clearance is required between bottom of insert and inside panel skin for proper epoxy bonding around buttom of
insert.
Table 2
| Length Dash Number | L | Thread Size | ||||||
| 440 | 632 | 832 | 1032 | 428 | 524 | 624 | ||
| -06* | .335 | .292 | .292 | .292 | .292 | – | – | – |
| -07 | .395 | .224 | .276 | .328 | .350 | .350 | .350 | .350 |
| -08 | .455 | .224 | .276 | .328 | .380 | .410 | .410 | .410 |
| -10 | .565 | .224 | .276 | .328 | .380 | .500 | .520 | .520 |
| -12 | .690 | .224 | .276 | .328 | .380 | .500 | .625 | .645 |
| -14 | .812 | .224 | .276 | .328 | .380 | .500 | .625 | .750 |
| -16 | .935 | .224 | .276 | .328 | .380 | .500 | .625 | .750 |
*Available in -1, -2 and -3 skin thicknesses only.
Table 3
| Skin Dash Number | T |
| -1 | .010-.019 |
| -2 | .020-.029 |
| -3 | .030-.039 |
| -4 | .040-.049 |
| -5 | .050-.059 |
| -6 | .060-.069 |
