Spring-Fast Military: NASM22529/1 Series

Cage Code: 0HES0

The MIL SPEC Series per NASM22529/1 has the lowest profile of any wire protection grommet edging available.
Its steel substrate is encapsulated with lubricious fusion bonded epoxy for superior abrasion and chemical resistance.
It has enhanced grip strength and is 2 axis conformable.

Key Benefits

  • Superior performance: encapsulated stainless steel core: outperforms plastic grommets.
  • Snap on installation lowers costs 49% vs. grommets with glue.  Watch the 4 min. video below.
  • Improves efficiency 9.5x – due to fewer steps in workflow.
  • U.S. Defense Dept. FAA Acceptable: NASM22529/1 and National Stock Number: Federal Supply Code 5325.

Grommet Differentiation Table (GDT)

Grommet SeriesCastle GeometryFlexibilityPolymer CoatingExtra Cushion100% TPE EncapsulationHigh HeatMil SpecApplication MethodNotes
NASM22529/1Alternating2 axisYesNoNo285°F/140°CYesSnap on/No adhesiveNo cure time delay
MS21266 Nylon Opposing2 axisNAYes NA257°F/125°CYesAdhesive Required8-24hr cure time delay
MS21266 Teflon Opposing2 axisNAYes NA527°F/275°CYesAdhesive Required8-24hr cure time delay


  • Military use and in service worldwide on helicopters, military transports, tactical equipment and C4 Electronics
  • Aerospace use on business jets and general aviation aircraft and related avionics and electronic systems
  • Straight edges, cutouts, access panels and knockouts
  • Small radii inside or outside corners


The old nylon grommet with glue is old, inefficient and costly.  DTi has a better way.

  • Epoxy encapsulated stainless steel substrate.
  • Snaps on fast with finger pressure
  • Installs continuously with two axis conformity
  • Self locking with strong retention – no adhesives
  • Simpler install: no adhesive, fixturing, curing, clean up or OSHA concerns, reduces installed costs
  • Maintenance is far easier due to its ease of application and removal
  • Customization available

Key Specifications

  • Resistant to hydrocarbons, immersion, salt spray, shock and vibration
  • Operating Temperature Heat continuous to -40°F to 285°F (-40°C to 140°C)
  • UL94 V-0 Flammability Rating
  • High Shock and Vibration Resistance to rms G 41.7
  • 8 sizes to fit edge thicknesses: 0.025” to 0.26” (0.6 mm to 6.6 mm)
  • Available in custom cut lengths & factory pre-cut reels of 25 ft. (7.6 m), 100 ft. (30.5 m) or 500 ft. (152 m)
  • Tools available: Installation roller, full by-pass shears, castle removal, measuring scale,
  • go / no-go sizing gauge, cutter cart


Spring-Fast® Product ConfigurationsM22529/1M22529/2
Axis Conformity22
Vicat Softening Point per ASTM D01525 Rate BN/ACushion: Thermoplastic Elastomer
Per ASTM D1525 Rate B, ISO306
230°F (110°C)
Operating Temperature Range285°F (140°C)185°F (85°C)
-40°F (-40°)
Dielectric Strength:
Volts 60 Hz per NASM22529, Section 3.2.1
SubstrateType 304 Stainless Steel
Taber Abrasion ResistanceSubstrate Finish: Epoxy
Per ASTM D 1044
1 kg load, C17 Wheel
8 mg loss 5000 cycles
TPE Cushion: Per D1044
1 kg load, C17 Wheel
25 mg loss 1000 cycles
FinishCoating: Thermosetting Epoxy, Color: Lime Green per FED-STD 595, Color Number 14533
Salt Spray Hours500
ASTM B117, MIL-STD-202, Method 301
ImmersionPer NASM22529 and Skydrol Compatible
Random Shock & VibrationMIL-STD-1344, Method 2005.1 Test Condition VI, Letter J
Duration 8 hours longitudinal and 8 hours perpendicular, rms G 41.7
FlammabilityUL94V-0 - File No. E113553 NZMT2
MIL-STD-202F, Method 111A
FAR 25.853
Telcordia GR63 Core
Fabrication OptionsReels: 25' (7.6m) & 100' (30.5m)
10 pack: ten 12.75" (32.4cm) strips
Custom cut lengths (see table below)
Federal Supply Class 5325 National Stock Numbers
NATO Part Numbers
Click here for DTi's Cross Reference Chart for National Stock Numbers & NATO Part Numbers

Custom Cut Lengths

Nominal Hole DiameterCut LengthsNumber of Castles