MIL-DTL-1222
Studs & Bolts
Mumbai · India
Why Studs, Bolts, and Cap Screws Share One Specification
Most fastener specifications on our site are organized around a single fastener type — hex bolts under FF-B-588, nuts under FF-N-836, cap screws under FF-S-107. MIL-DTL-1222 takes a different organizing principle: it groups several related fastener types — double-end studs, bolts, hex cap screws, and socket set screws — together under one specification because what actually needs standardizing across a critical government assembly isn’t the head shape, it’s the alloy steel or corrosion-resistant material grade and the mechanical property requirements those grades carry.
That grouping makes sense once you consider how these parts actually get used together — a critical joint might use a stud threaded into a tapped hole, secured with a cap screw elsewhere in the same housing, and a socket set screw locking a shaft component nearby, all needing the identical alloy grade and corrosion resistance for a consistent, traceable material story across the whole assembly. One specification covering all of them removes any ambiguity about whether the material requirement is actually equivalent across different fastener shapes.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our MIL-DTL-1222 range draws on our existing deep stud bolt manufacturing capability, verified by mechanical and dimensional testing under our ISO 9001:2015 quality system.
Where This Specification Genuinely Applies
Consistent Material Grade Across Types
Studs, bolts, and cap screws in the same assembly share the identical alloy or corrosion-resistant grade requirement.
Unambiguous Government Specification
Removes ambiguity in federal purchase orders needing a defined material grade across a mixed fastener assembly.
Full Traceability Across a Kit
Simplifies documentation when multiple fastener types in one kit need to trace to a common material specification.
Verified Mechanical & Corrosion Properties
Batch tensile and corrosion-resistance testing confirms genuine grade compliance, not just correct dimensions.
MIL-DTL-1222 Fastener Type Options
Double-End Studs
Threaded both ends, one end for permanent installation into a tapped hole, the other for a nut connection.
Hex Head Bolts
Standard hex head bolts for general assembly under the same alloy or corrosion-resistant material grade.
Hex & Socket Head Cap Screws
Precision cap screws for tensioned machine-part joints requiring the specified alloy grade.
Socket Set Screws
Headless, point-driven fasteners for shaft-locking applications built to the same material specification.
Alloy Steel vs Corrosion-Resistant Steel
Confirming the correct material class for the actual service environment avoids specifying a fastener that corrodes or underperforms. This table is the quick reference we use with buyers before quoting.
| Aspect | Alloy Steel Class | Corrosion-Resistant Class |
|---|---|---|
| Typical Material | Heat-treated alloy steel | 300-series stainless / CRES alloy |
| Corrosion Resistance | Requires coating for exposure | Inherent corrosion resistance |
| Typical Strength | Generally higher tensile grade | Good strength, corrosion priority |
| Best Suited For | High-load, controlled environment | Marine, chemical, or humid exposure |
MIL-DTL-1222 Specification Details
Materials We Manufacture In
- Alloy Steel Heat Treated Grade
- Corrosion-Resistant Steel 300 Series CRES
- Finish Cadmium / Zinc-Nickel / Passivated
- Coating Per Environment Requirement
How These Fasteners Are Made
- Process Hot Forged / Machined
- Heat Treatment Per Grade Requirement
- Testing Tensile / Corrosion Resistance
- Quality Batch Sampled
Available Dimensions
- Nominal Size 1/4″ – 2″ (Inch Series)
- Metric Equivalent Available to Drawing
- Type Stud / Bolt / Cap Screw / Set Screw
- Custom Sizes On Request
Application Areas
Wherever a government or defense assembly needs consistent material traceability across multiple fastener types.
Defense & Military Equipment
consistent material grades
Naval & Marine Equipment
across a mixed fastener kit
Government Infrastructure Projects
federal facility construction
Machine & Equipment Assembly
shaft-locking hardware
Aerospace Ground Support Equipment
ground equipment assembly
Rail & Transit Equipment
authority procurement
Pressure Vessel & Piping Assembly
for critical joints
General Federal Contract Hardware
federally specified projects
Standard Export Documentation
Prepared as standard practice for every MIL-DTL-1222 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 specification in full.
Tensile & Corrosion Test Records
Batch-level testing confirming genuine grade compliance for the ordered material class.
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
ASTM A193 B7 / B7M / B6 Stud Bolts
Our detailed alloy steel stud bolt grade guide, closely aligned with MIL-DTL-1222’s alloy steel class.
View ASTM A193 Guide →FF-B-588 Hex Bolts
Our commercial hex bolt specification for general-purpose, non-critical assembly needs.
View FF-B-588 →FF-S-92 Set Screws
Our commercial set screw specification for general-purpose shaft-locking applications.
View FF-S-92 →Fasteners Manufacturer & Exporter to the USA
Our broader capability manufacturing to ASTM/ASME and US federal/military standards.
View USA Export Guide →Need Consistent Material
Grade Across a Mixed Fastener Kit?
Tell us your material class requirement and the fastener types involved — we’ll confirm specification match and quote across studs, bolts, cap screws, and set screws together. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in