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4‑Inch 3‑Knuckle Double‑Washers Stainless‑Steel Fire‑Rated Butt Door Hinge
- Product Information
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SS039 4‑Inch 3‑Knuckle Double‑Washers Stainless‑Steel Fire‑Rated Butt Door Hinge
SS039 4‑inch 3‑knuckle double‑washers butt door hinge manufactured by WINGTEC. Robust 3‑knuckle construction with double‑washer internal structure for durable wear‑resistant performance. Material optional in 201 / 304 / 316 stainless‑steel grades for different anti‑corrosion requirements. Available dimensions:4.0"x3.0"x3.0mm,4.0"x3.5"x2.0mm. Multiple hole‑template selections including template, zig‑zag left / right / symmetrical patterns; various pin‑tip options: fixed pin, loose pin, non‑rising removable pin, non‑removable pin, flat / ball / rivet / crown tip. Full‑mortise butt mounting, reversible non‑handed for left‑hand and right‑hand door installation. Long‑term internal lubrication ensures smooth and silent door opening‑closing. Wide range of decorative finish options. UL‑Listed UL10C 3‑Hour fire‑rated(UL File No.R42033), complies with EN1935 and conforms to NFPA80 fire‑door standards. Full matching mounting‑screw accessories are supplied. Suitable for wooden, metal and steel interior‑outer fire‑rated door assemblies, widely used for education, healthcare, hospitality, government and office building hardware projects. Monthly production capacity reaches 200000 units for B2B wholesale architectural tender projects.
Product Specification
Technical Parameter
| Specification | Parameter |
|---|---|
| Product Type | UL‑Listed 4‑Inch 3‑Knuckle Double‑Washers Stainless‑Steel Full‑Mortise Butt Door Hinge, UL File No.R42033 |
| Operation | Double‑washers wear‑resistant long‑lubrication quiet swing,3‑knuckle robust construction, multi‑pin & multi‑tip optional, template / zig‑zag hole‑pattern options, full‑mortise butt installation, reversible non‑handed left‑right fit, UL‑Listed UL10C(UL File No.R42033) & EN1935 fire‑safety certified, meets NFPA80 |
| Material | 201/304/316 optional stainless‑steel hinge leaf,3‑knuckle housing, double‑washers wear‑resistant internal assembly, multiple decorative surface treatments |
| Core Functions | 3‑knuckle double‑washers wear‑resistant structure, long‑term lubricated smooth swing, reversible non‑handed mounting, multi‑finish / pin / tip / hole‑pattern choices,3‑hour fire‑rated, durable for interior‑outer door traffic |
| Application | Wooden / Metal / Steel Interior‑Outer Fire‑Rated Door Assemblies, education, healthcare, hospitality, government and office building hardware tender projects |
| Production Capacity | 200000 Units / Month |
| MOQ | 500 Pairs |
| Sample Time | 5‑7 Working Days |
| Lead Time | 30‑35 Days |
| Packing | 1 Pair / White Box / Color Box / Blister Card, Standard Export Carton |
Application Scenarios
Multi‑Material Fire‑Door Installations
SS039 4‑inch 3‑knuckle double‑washers butt hinge adopts solid 3‑knuckle plus double‑washer wear‑resistant internal construction. Multiple stainless‑steel grades deliver adjustable anti‑rust performance for indoor and outdoor environments. Long‑term lubricated double‑washer assembly guarantees stable smooth and silent swing under regular daily usage. Two mainstream dimension specifications and diverse hole‑template options fit various wooden / metal / steel door‑frame cut‑out requirements. Flexible pin and tip selections satisfy on‑site installation demands. Reversible non‑handed design reduces SKU inventory burden for large‑volume tender orders. UL‑Listed UL10C(UL File No.R42033) and EN1935 certifications satisfy international fire‑safety building‑code standards for double‑washer butt‑hinge assemblies.
Institutional Facilities New‑Build & Renovation
This 4‑inch 3‑knuckle double‑washers stainless‑steel butt hinge works excellently on wooden, metal and steel interior‑outer fire‑rated door‑sets. Widely selected for education campus, healthcare hospital, hospitality hotel, government and office facility new‑construction and retrofit renovation hardware assignments. Abundant decorative finish selections match diverse building interior‑exterior decoration styles.
Architectural Hardware Tender Specification Projects
Full matching mounting‑screw accessories included. Full‑mortise butt mounting with reversible non‑handed configuration. Rich dimension, hole‑pattern, pin‑tip and finish selections available. UL compliance datasheet, EN test documentation, installation drawings and compliance papers can be supplied for tender‑submission for institutional fire‑safety building‑projects, UL certification under file R42033.
Product Characteristics
Durable 3‑knuckle hinge housing, optional 201/304/316 stainless‑steel leaf, built‑in double‑washers wear‑resistant assembly; long‑term lubricated smooth quiet swing for interior‑outer fire‑rated door‑operation
Two available dimension options:4.0"x3.0"x3.0mm and 4.0"x3.5"x2.0mm; supports template and zig‑zag multi‑direction hole‑patterns for wood / hollow‑metal door frames
Classic full‑mortise butt‑hinge installation, true reversible non‑handed left‑right universal fit; abundant pin‑type, tip‑style, hole‑template and decorative‑finish selections
UL‑Listed UL10C 3‑Hour fire‑rated(UL File No.R42033), complies with EN1935, conforms to NFPA80 fire‑door standards for 3‑knuckle double‑washers butt‑hinge hardware
Full‑mortise butt‑type mounting; wear‑resistance optimized for wooden, metal, steel interior‑outer fire‑rated door assemblies
Complete matching mounting‑screw accessories supplied; monthly capacity 200000 units for B2B wholesale double‑washers butt‑hinge bulk tender‑orders
Warranty & Customization
Standard quality warranty against manufacturing defects of stainless‑steel hinge‑leaf,3‑knuckle housing and internal double‑washers wear‑resistant components for interior‑outer fire‑door usage
Bulk wholesale supply for architectural‑construction and institutional fire‑safety‑door tender‑projects; custom finish, custom‑pin‑style, tip‑style and hole‑pattern variant options are available
2D installation drawing, performance datasheet and UL‑compliance statement documentation available for tender‑submission documentation, UL File R42033
Frequently Asked Questions
What certifications does SS039 double‑washers butt hinge hold?
SS039 is UL‑Listed UL10C 3‑Hour fire‑rated(UL File No.R42033), complies with EN1935 and conforms to NFPA80 fire‑door requirements for 4‑inch 3‑knuckle double‑washers stainless‑steel butt‑hinge hardware.
What is the advantage of double‑washers hinge structure?
SS039 adopts double‑washers internal structure to improve wear‑resistance and keep long‑term lubrication performance, maintaining smooth and silent door swing under long‑time frequent opening‑closing cycles. Two dimension variants are offered to match different door thickness requirements.
Can SS039 change hole‑pattern, pin and tip styles?
Yes, multiple hole‑patterns(template / zig‑zag left‑right‑symmetrical), pin styles and tip styles are optional. Reversible non‑handed for left‑hand / right‑hand full‑mortise‑door installation. Installation must follow local fire‑code for fire‑door assemblies.
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