Why 4 interlock corners instead of 2 along the long edges?

Answer: Three-layer stacking sends shear through all four corners; with 2 on the long edges the short-side diagonal stretches first and the ≤1.6 mm line fails, so 4 symmetric corners let any split be logged.

Are the 25% rate and the ≤1.6 mm deviation the same?

Answer: No. The 25% rate is strip height loss once shut, while ≤1.6 mm is the difference between two mouth diagonals after 3 layers for 48 h; one governs seepage, the other shape drift.

Why 1.2 m water depth for 30 min?

Answer: That band sits in the same log as the 1.2 m drop recheck, mouth down; the seal is checked against the IP67 method, with no certificate number or test grade.

Why rerun 3500 cycles after hardware replacement?

Answer: A new catch travel shifts pressing force across the four rim edges, and a 3.2 N·m torque set off lets one edge seat early; only after 3500 cycles does the reserve spread show whether the face is back to 25%.

Can 96 h salt spray data stand in for a sealing pass?

Answer: No. Salt spray reflects hardware surface only; judgement still rests on rim parallelism, 460 N catch force and 1.2 m immersion, and appearance logs do not replace the face recheck.

Water-Resistant Military Transport Case

Quick answer: A Water-Resistant Military Transport Case ties 4 interlock corners to a 25% gasket reserve, capping lid diagonal at 1.6 mm after 3 layers for 48 h.

Stacking interlock-corner shear of a Water-Resistant Military Transport Case
Lid gasket strip and compression reserve
Diagonal deviation after three-layer stacking
Leak reading under water immersion
Sealing face recheck after hardware replacement
FAQ

1. Stacking interlock-corner shear of a Water-Resistant Military Transport Case

A Water-Resistant Military Transport Case starts its dimension chain at the 4 interlock corners of the lid. Outer 700×500×310 mm, inner cavity 630×435×240 mm, wall 4.8 mm, empty shell 9.0 kg and design load 19 kg: the corners form bosses and matching recesses between stacked shells, sending the upper load into corner shear planes rather than leaving the lid to bend alone.

The boss root joins the lid ribs as one piece, and the recess wall holds the 4.8 mm without local thinning. A Water-Resistant Military Transport Case sets the 4 corners symmetrically; stacking runs 3 layers for 48 h on a static rig, the diagonal read after unloading and rebound, not at the loaded peak.

Stacking layers	Hold time	Corner shear recheck
1 layer	48 h	Datum reading
2 layers	48 h	No corner slip
3 layers	48 h	Diagonal ≤1.6 mm
3 layers retest	48 h	Four-corner split log

2. Lid gasket strip and compression reserve

A 25% compression rate on the lid strip is the first dimension that keeps water out of a Water-Resistant Military Transport Case. When shut, 4 catches each give 460 N to press the lid onto the mouth step, squeezing the strip to three quarters of its free height; the reserve absorbs lid warp after stacking. Below 20% the mouth seeps, above 30% catch travel is used up.

Water-Resistant Military Transport Case injection moulding hall with silver ducts, yellow pipe supports, a white control cabinet, hopper and raw material sacks on yellow floor

Strip section follows the step width, and the bonded joint must not lift at the corners. The rim and step face of a Water-Resistant Military Transport Case stay parallel under 4 evenly spaced catches; each 460 N decays across 3500 open-close cycles, and once low the 25% rate drops and immersion readings lose meaning.

Interlock feature	Build method	Recheck item
Lid corner bosses	Seat into lower recesses	No whitening on shear face
Base corner recesses	4.8 mm wall kept	Flatness of shear face
Corner blend radii	Moulded in one shot	No stress cracking
Mouth step face	Rim pressed parallel	25% compression rate

3. Diagonal deviation after three-layer stacking

A mouth diagonal deviation of ≤1.6 mm after 3 layers for 48 h is where a Water-Resistant Military Transport Case accepts corners and lid stiffness together. The length difference of the two diagonals is read on a scribed datum at room temperature after unloading; for a 630×435×240 mm cavity the datum comes from the long and short edges.

Drops at 1.2 m add a recheck: lid shut, 4 catches locked, six faces once each, then another 48 h on the rig. A Water-Resistant Military Transport Case bands the readings so an over-line part returns to boss and rib forming instead of passing by tighter catches.

Deviation value	Stacking condition	Judgement
0.8 mm	3 layers / 48 h	Pass
1.2 mm	3 layers / 48 h	Pass
1.6 mm	3 layers / 48 h	Boundary
1.8 mm	3 layers / 48 h	Reject
2.0 mm	3 layers / 48 h	Lid rework

4. Leak reading under water immersion

Immersion runs at 1.2 m for 30 min, with the seal checked against the IP67 method and no certificate number claimed. A Water-Resistant Military Transport Case is shut with 4 catches locked, mouth down; after the hold the lid is opened for water marks, beads or damp lines on the step and inner strip, shell side only.

Water-Resistant Military Transport Case four small closed shells in orange khaki olive and black on a light wood table, one black nameplate

A second immersion follows the 1.2 m drop, since corner shear can push the diagonal past ≤1.6 mm and relieve the strip locally. A Water-Resistant Military Transport Case logs a room-temperature part and a dropped part at the same depth for the same 30 min; any seepage sends the batch back to a sealing-face recheck.

5. Sealing face recheck after hardware replacement

Four catches at 460 N each and a hinge torque of 3.2 N·m are fixed when hardware on a Water-Resistant Military Transport Case is refitted. After 96 h salt spray a new catch has a different lock travel, and torque set high or low lets one rim edge reach the step first, turning 25% into one side on target; 3500 empty open-close cycles run before the four-edge reserve is measured.

The recheck has three steps: rim-to-step parallelism, corner locking force, then one immersion at 1.2 m for 30 min. A Water-Resistant Military Transport Case states no model or clause number here; the four-edge reserve spread, post-drop diagonal and immersion result must all return to their lines. Surface condition after 96 h salt spray is appearance only. JUNZHIJIA keeps hinge torque and catch force in one table for such batches.

Conclusion

A Water-Resistant Military Transport Case closes 4 interlock-corner shear loads, a 25% gasket rate and a ≤1.6 mm mouth diagonal after 3 layers for 48 h into one acceptance chain, finished by immersion at 1.2 m for 30 min. Four catches at 460 N, a 3.2 N·m hinge torque and a 3500-cycle refit recheck bring the sealing face back to its line after hardware work; records checked against the IP67 method and 96 h salt spray cover shell, lid and insert alone.