FF-N-836
Hex Nuts
Mumbai · India
What FF-N-836 Actually Covers
Every screw, cap screw, and set screw specification we manufacture solves half of a fastening problem — the other half is the nut it threads into, and FF-N-836 is where that half gets specified. Like FF-W-100 does for flat washers, FF-N-836 structures each nut around type (the general form — hex, hex jam, hex slotted, or hex cap), grade (the material it’s made from), and finish, giving a federal purchase order the same unambiguous reference structure it has for washers, letting a buyer specify a nut precisely without a supplier substituting something materially different.
That structure matters because “just send a hex nut” leaves real room for confusion — a hex jam nut is deliberately thinner and meant for locking against another nut, not for carrying full clamping load on its own; a hex slotted nut exists specifically to accept a cotter pin through a matching drilled bolt for positive anti-rotation; a hex cap nut closes over the bolt end entirely for a finished, weather-sealed look. Specifying the type correctly is exactly the kind of detail FF-N-836 exists to remove ambiguity around.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our hex nut range is manufactured across type, grade, and finish combinations most commonly specified, verified by mechanical and dimensional testing under our ISO 9001:2015 quality system.
Where FF-N-836 Genuinely Applies
Unambiguous Government Specification
Type/grade/finish structure removes ambiguity in federal purchase orders needing a defined nut standard.
Correctly Matched to Bolt Grade
Nut grade selected to correctly pair with the bolt or screw’s property class and load requirement.
Broad Material Coverage
Carbon steel, stainless steel, and brass options across all four core nut types.
Verified Thread & Proof Load
Batch thread gauge and proof load testing confirms genuine strength grade, not just correct outer dimensions.
FF-N-836 Type Options Explained
Standard Hex Nut
The general-purpose full-height hex nut, sized for full clamping load capacity on its own.
Hex Jam Nut
Thinner than a standard hex nut, designed to jam against a full nut for locking, not carry full load alone.
Hex Slotted (Castellated) Nut
Slots cut into the top face to accept a cotter pin through a matching drilled bolt for positive anti-rotation.
Hex Cap (Acorn) Nut
Domed closed top that fully covers the bolt end, for a finished appearance and basic weather protection.
Nut Type Selection Guide
The right nut type depends on whether the joint needs full clamping load, locking, anti-rotation, or a finished appearance. This table is the quick reference we use with buyers before quoting.
| Requirement | Correct Type | Key Function |
|---|---|---|
| General Full-Strength Joint | Hex Nut | Full clamping load capacity |
| Locking Against Another Nut | Hex Jam Nut | Thin profile, jams against a full nut |
| Positive Anti-Rotation with Cotter Pin | Hex Slotted Nut | Slotted top accepts a cotter pin |
| Finished, Covered Bolt End | Hex Cap Nut | Domed closed top, weather protection |
FF-N-836 Specification Details
Materials We Manufacture In
- Carbon Steel Plain / Zinc Plated
- Stainless Steel 304 / 316
- Brass Decorative / Electrical Use
- Finish Plain / Zinc / Black Oxide
How Hex Nuts Are Made
- Process Hot Forged / Cold Formed
- Thread Tapped to Class 2B
- Testing Proof Load / Thread Gauge
- Quality Batch Sampled
Available Dimensions
- Nominal Size #4 – 1.5″ (Inch Series)
- Metric Equivalent Available to Drawing
- Type Hex / Jam / Slotted / Cap
- Matching Standard ASME B18.2.2
Application Areas
Wherever a government or defense-adjacent purchase order references the specification directly.
Defense & Military Equipment
hardware requirements
Government Infrastructure Projects
federal facility construction
Automotive & Suspension Assembly
cotter pin retention
Naval & Marine Equipment
procurement contracts
Electrical & Signal Equipment
electrical applications
General Federal Contract Supply
the spec is explicitly named
Rail & Transit Equipment
authority procurement
General Government-Contract Hardware
federally specified projects
Standard Export Documentation
Prepared as standard practice for every FF-N-836 hex nut shipment.
Mill Test Certificate (MTC)
Heat number, chemical composition, and mechanical property verification for every lot.
Certificate of Conformance
Confirms the shipment matches the purchase order type/grade/finish specification in full.
Proof Load Test Records
Batch-level testing confirming the nut holds its rated proof load without thread failure.
Certificate of Origin (COO)
Confirms India as country of manufacture for destination customs purposes.
NABL Accredited Test Reports
Independent mechanical and dimensional testing available on request for critical applications.
Commercial Invoice & Packing List
Itemized value, Incoterm, and detailed carton/weight breakdown for customs clearance.
Internationally Recognised Standards Coverage
Related Fastener Grades & Materials
FF-W-100 Flat Washers
The companion flat washer federal specification, structured the same way by type, grade, and finish.
View FF-W-100 →FF-S-107 Cap Screws
Precision cap screws that pair with FF-N-836 nuts in tensioned bolted joints.
View FF-S-107 →High Tensile Bolts Specifications
Matching bolt property classes to pair correctly with the right FF-N-836 nut grade.
View High Tensile Specs →Fasteners Manufacturer & Exporter to the USA
Our broader capability manufacturing to ASTM/ASME and US federal standards.
View USA Export Guide →Need the Exact
Type, Grade & Finish?
Send us your FF-N-836 designation — type, grade, and size — and we’ll confirm specification match, lead time, and documentation before you order. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in