NTMODS®
316L Stainless Steel Case
316L Marine-Grade Steel + AR-Coated Reinforced K1 Crystal
This is a full structural upgrade, not a cosmetic add-on.
Instead of resin and acrylic, this case is CNC-machined from solid 316L marine-grade stainless steel and fitted with an anti-reflective reinforced K1 crystal.
The steel is low-carbon, corrosion resistant, and hypoallergenic, built to handle sweat, salt, and long-term daily wear without degrading.
The AR-coated K1 crystal offers very high scratch resistance, strong impact durability, and improved clarity under direct light.
316L Steel is the industry standard used across most high-end watch brands.
How It Works
Add to Cart.
A required installation form will appear:
Checkout as usual.
If you are ordering this with a Custom Build and select Install it, I will professionally install the part before shipping your watch (no extra fee).
If you select Ship separately, you will receive the part individually for DIY installation.
If you are purchasing this part only, simply choose Ship separately.
Material & Construction
• CNC-machined from solid 316L marine-grade stainless steel
• Low-carbon composition for corrosion resistance
• Hypoallergenic, skin-safe contact surface
• Anti-reflective reinforced K1 crystal
• Increased rigidity for a noticeably heavier, more substantial wrist feel
• 18mm strap / adapters compatible
Colors & Finishes
Diamond* option - features 5A-grade cubic zirconia stones set into the bezel
Silver – Natural brushed 316L finish
Gold & Black – Ion-Bond PVD coated
Ion-Bond PVD is not paint and not standard plating.
• Molecularly bonded to the steel surface
• Far stronger than paint or basic plating
• Even, uniform surface tone
• Significantly more wear-resistant
• Color stable over time
This is the same coating process used in high-end watch manufacturing.
Installation (DIY Friendly)
Included:
• 1× precision rubber gasket
• 2× 18mm steel lugs
• 5× stainless steel screws
TIPS for best results:
• Use a hand screwdriver when installing the backplate to protect threads
• Gently clean any minor CNC residue inside screw holes before installing screws
• Tighten evenly to maintain gasket seal
When combined with the NTMODS® 316L stainless steel backplate, sealing integrity is further improved due to matched tolerances and gasket compression.
Hydromod safe
The reinforced crystal and rigid stainless structure resist flex under pressure, making them far more stable for oil-filled builds than resin cases.
Proper installation and sealing are required for any pressure-based modification.
Compatibility Notes
Perfect Fit - No Modification Required
Casio AE1200 / Module 3299
Casio AE1300 / Module 3426
Casio WS1600 / Module 3556
Fits - Faceplate modification required. Stock backplates are not compatible.
Module fitment is precise. Faceplate and backplate alignment is accurate when compatible models are used.
Important Notes
This listing includes the case, rubber gasket, lugs, and screws only. Any other components are sold separately.
Minor internal machining marks inside screw channels may be present and are a normal result of CNC manufacturing. They do not affect structural integrity or performance.
Compatibility Disclaimer:
This part is engineered to fit original stock Casio components as well as NTMODS® parts when used with the compatible models listed above.
I cannot guarantee fitment, alignment, or water resistance performance when using cases, faceplates, backplates, bracelets, or components from other manufacturers.
Compatibility issues caused by third-party parts are not my responsibility.
NTMODS®
316L Stainless Steel Case
316L Marine-Grade Steel + AR-Coated Reinforced K1 Crystal
This is a full structural upgrade, not a cosmetic add-on.
Instead of resin and acrylic, this case is CNC-machined from solid 316L marine-grade stainless steel and fitted with an anti-reflective reinforced K1 crystal.
The steel is low-carbon, corrosion resistant, and hypoallergenic, built to handle sweat, salt, and long-term daily wear without degrading.
The AR-coated K1 crystal offers very high scratch resistance, strong impact durability, and improved clarity under direct light.
316L Steel is the industry standard used across most high-end watch brands.
How It Works
Add to Cart.
A required installation form will appear:
Checkout as usual.
If you are ordering this with a Custom Build and select Install it, I will professionally install the part before shipping your watch (no extra fee).
If you select Ship separately, you will receive the part individually for DIY installation.
If you are purchasing this part only, simply choose Ship separately.
Material & Construction
• CNC-machined from solid 316L marine-grade stainless steel
• Low-carbon composition for corrosion resistance
• Hypoallergenic, skin-safe contact surface
• Anti-reflective reinforced K1 crystal
• Increased rigidity for a noticeably heavier, more substantial wrist feel
• 18mm strap / adapters compatible
Colors & Finishes
Diamond* option - features 5A-grade cubic zirconia stones set into the bezel
Silver – Natural brushed 316L finish
Gold & Black – Ion-Bond PVD coated
Ion-Bond PVD is not paint and not standard plating.
• Molecularly bonded to the steel surface
• Far stronger than paint or basic plating
• Even, uniform surface tone
• Significantly more wear-resistant
• Color stable over time
This is the same coating process used in high-end watch manufacturing.
Installation (DIY Friendly)
Included:
• 1× precision rubber gasket
• 2× 18mm steel lugs
• 5× stainless steel screws
TIPS for best results:
• Use a hand screwdriver when installing the backplate to protect threads
• Gently clean any minor CNC residue inside screw holes before installing screws
• Tighten evenly to maintain gasket seal
When combined with the NTMODS® 316L stainless steel backplate, sealing integrity is further improved due to matched tolerances and gasket compression.
Hydromod safe
The reinforced crystal and rigid stainless structure resist flex under pressure, making them far more stable for oil-filled builds than resin cases.
Proper installation and sealing are required for any pressure-based modification.
Compatibility Notes
Perfect Fit - No Modification Required
Casio AE1200 / Module 3299
Casio AE1300 / Module 3426
Casio WS1600 / Module 3556
Fits - Faceplate modification required. Stock backplates are not compatible.
Module fitment is precise. Faceplate and backplate alignment is accurate when compatible models are used.
Important Notes
This listing includes the case, rubber gasket, lugs, and screws only. Any other components are sold separately.
Minor internal machining marks inside screw channels may be present and are a normal result of CNC manufacturing. They do not affect structural integrity or performance.
Compatibility Disclaimer:
This part is engineered to fit original stock Casio components as well as NTMODS® parts when used with the compatible models listed above.
I cannot guarantee fitment, alignment, or water resistance performance when using cases, faceplates, backplates, bracelets, or components from other manufacturers.
Compatibility issues caused by third-party parts are not my responsibility.
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