Custom Fasteners

Precision CNC Machined Custom Fasteners

Custom and standard fasteners manufactured to AS9100D aerospace standards. From precision bolts and screws to complex studs, nuts, and specialty fasteners, we deliver components meeting ANSI, DIN, ISO, and military specifications with tight thread tolerances, controlled head dimensions, and complete material traceability for critical aerospace, defence, and industrial assembly applications.

2A/3A
Thread Classes
±0.01mm
Dimensional Tolerance
M2-M64
Thread Range
AS9100D
Quality Assured

Custom Fastener Manufacturing

Our precision CNC turning and machining capabilities deliver custom fasteners with exceptional accuracy when standard off-the-shelf components won't meet your requirements. Whether you need non-standard thread sizes, special head configurations, exotic materials, or unique lengths, we manufacture fasteners to exact specifications with tight thread tolerances and controlled dimensional accuracy.

From miniature aerospace fasteners to large industrial bolts, we work with a comprehensive range of materials including alloy steels, stainless steels, titanium, and specialty alloys. Complete heat treatment, thread rolling, and surface coating services ensure your fasteners meet the most demanding strength, corrosion resistance, and assembly requirements with full traceability and certification.

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Key Applications

Aerospace Assemblies

Engine mounting bolts, structural fasteners, panel screws

Defence Systems

High-strength bolts, specialty studs, security fasteners

Oil & Gas Equipment

Pressure vessel bolts, flange studs, subsea fasteners

Industrial Machinery

Machine screws, custom studs, special nuts, threaded rods

Types of Custom Fasteners We Manufacture

Comprehensive range for critical assembly applications

Precision Bolts

Custom bolts with controlled head and shank dimensions.

  • Hex head, socket head, button head
  • Metric and imperial threads
  • Custom lengths and diameters
  • Non-standard thread pitches

Custom Screws

Machine screws, cap screws, and set screws to specification.

  • Socket cap screws (SHCS)
  • Button head cap screws (BHCS)
  • Flat head, pan head, truss head
  • Set screws with cup/cone/flat points

Threaded Studs

Double-ended studs for flange and equipment mounting.

  • Full thread or partial thread
  • Continuous thread studs
  • Tap end and nut end studs
  • Custom lengths and materials

Custom Nuts

Precision nuts with controlled thread and across-flats dimensions.

  • Hex nuts, square nuts, wing nuts
  • Nylon insert lock nuts (Nyloc)
  • Castle nuts with cotter pin holes
  • Thin nuts, jam nuts, coupling nuts

Shoulder Screws

Precision shoulder screws with ground shoulder diameter.

  • Precision ground shoulders
  • Socket head or low head
  • Custom shoulder diameters
  • Hardened to HRC 50-55

Dowel Screws

Double-ended wood screws for joining applications.

  • Machine thread one end
  • Wood thread other end
  • Custom length combinations
  • Stainless or plated steel

Specialty Fasteners

Custom engineered fasteners for unique requirements.

  • Security screws (tamper-resistant)
  • Captive screws and panel fasteners
  • Thumb screws and knurled screws
  • Multi-diameter fasteners

Eye Bolts & Hooks

Lifting and attachment bolts with formed or welded eyes.

  • Straight eye bolts
  • Shoulder eye bolts
  • Load-rated designs
  • Custom eye orientations

Threaded Rods

Continuous thread rods for structural and hanging applications.

  • Full thread continuous rod
  • Custom cut lengths
  • Metric and imperial threads
  • Stainless, zinc, or plain finish

Head Styles & Drive Types

Multiple configurations for every assembly requirement

Head Styles

Hex Head

Standard hex bolts, heavy hex

Socket Head

Cap screws, low profile heads

Button Head

Rounded dome head, aesthetic

Flat/Countersunk

Flush mounting, 82° or 100°

Pan Head

Low profile, large bearing area

Truss Head

Extra-wide head, thin materials

Flange Head

Integrated washer, load distribution

Low Head

Minimal protrusion, tight spaces

Drive Types

Hex Socket

Allen key, high torque capacity

Phillips

Cross recess, common standard

Torx/Star

6-point star, cam-out resistant

Slotted

Single slot, traditional

Pozidriv

Improved Phillips design

Square/Robertson

Square recess, positive drive

Torx Plus

Enhanced torx, higher torque

Security Drives

Tamper-resistant, pin variants

Materials for Custom Fasteners

High-performance materials for strength and corrosion resistance

Carbon & Alloy Steel

  • SAE Grade 2: Low carbon, general purpose
  • SAE Grade 5: Medium carbon, heat treated
  • SAE Grade 8: Alloy steel, high strength
  • 4140/4340: Chromoly alloy steel
  • 8620: Case hardening grade

Benefits: High tensile strength, heat treatable, economical

Stainless Steel

  • 18-8 (304): General corrosion resistance
  • 316: Marine grade, chemical resistant
  • 410: Martensitic, heat treatable
  • 17-4 PH: Precipitation hardening
  • A2/A4: Metric stainless grades

Benefits: Excellent corrosion resistance, cleanable, food-safe

Titanium Alloys

  • Grade 2: Commercially pure titanium
  • Grade 5 (Ti-6Al-4V): Aerospace standard
  • Grade 23: Medical/aerospace grade
  • Grade 9: Tube and fastener grade
  • Beta-C: High strength alloy

Benefits: High strength-to-weight, corrosion resistance, non-magnetic

Specialty Alloys

  • Inconel 718: High temperature nickel alloy
  • Monel K-500: Marine/chemical service
  • Hastelloy C-276: Extreme corrosion resistance
  • Aluminum 7075-T6: Lightweight aerospace
  • Brass/Bronze: Electrical, decorative

Benefits: Extreme environments, specialized performance

Thread Standards & Specifications

Manufacturing to international thread standards

Metric (ISO)

  • • ISO 724 metric threads
  • • M2 to M64 sizes
  • • Coarse pitch (1.0-6.0mm)
  • • Fine pitch options
  • • 6g/6h tolerance classes
  • • Left or right hand

Unified (ANSI)

  • • UNC (coarse) threads
  • • UNF (fine) threads
  • • UNEF (extra fine)
  • • #0-80 to 4" diameter
  • • 2A/2B or 3A/3B class
  • • ANSI B1.1 standard

British Standards

  • • BSW (Whitworth)
  • • BSF (Fine)
  • • BSP pipe threads
  • • BA (British Association)
  • • BS 3643 standard
  • • Legacy equipment

Special Threads

  • • NPT/NPTF pipe threads
  • • ACME trapezoidal
  • • Buttress threads
  • • Multi-start threads
  • • Custom pitch/diameter
  • • Left-hand threads

Manufacturing Capabilities

Advanced processes for precision fastener production

CNC Turning

Swiss-type and multi-axis turning for complex fasteners

Thread Rolling

Cold-formed threads for superior strength and fatigue resistance

Thread Cutting

Single-point threading and die cutting for custom pitches

Heat Treatment

Through hardening, case hardening, and tempering services

Surface Coating

Zinc plating, passivation, and specialty coatings

Head Forming

Cold heading and machined head configurations

Secondary Ops

Drilling, slotting, knurling, and custom features

Quality Control

Thread gauging, dimensional inspection, and testing

Surface Finishes & Coatings

Corrosion protection and appearance options

Zinc Plating

Clear, yellow, or black chromate for corrosion protection

Cadmium Plating

Aerospace applications, superior corrosion resistance

Black Oxide

Minimal dimensional change, matte black finish

Passivation

Stainless steel chemical treatment per ASTM A967

Electroless Nickel

Uniform coating, excellent wear and corrosion resistance

Zinc-Nickel

Automotive grade, 1000+ hour salt spray resistance

Phosphate

Oil retention, lubricity, corrosion protection

PTFE/Teflon

Dry film lubricant, chemical resistance

Quality Control & Testing

Comprehensive inspection ensuring precision and performance

Thread Verification

Complete thread inspection and gauging.

  • Thread plug/ring gauges
  • Thread pitch verification
  • Major/minor diameter measurement
  • Thread class confirmation (2A/3A)

Dimensional Control

Precise measurement of all critical dimensions.

  • Length measurement
  • Head dimensions (across flats/corners)
  • Shank diameter verification
  • CMM inspection available

Mechanical Testing

Verification of strength and performance.

  • Tensile strength testing
  • Proof load verification
  • Hardness testing (Rockwell/Vickers)
  • Torque-tension relationship

Material Verification

Complete material traceability and certification.

  • Material test reports (MTR)
  • XRF alloy verification
  • Chemical composition analysis
  • Heat lot traceability

Coating Quality

Surface finish and coating verification.

  • Coating thickness measurement
  • Adhesion testing
  • Salt spray testing
  • Visual inspection per AQL

Documentation

Complete quality documentation package.

  • AS9102 First Article Inspection
  • Certificate of Conformance
  • Material certifications
  • Test reports and data

AS9100D Certified Fastener Manufacturing

Every custom fastener is manufactured under our AS9100D certified quality system, ensuring aerospace-grade precision with complete traceability, rigorous thread inspection, and verified mechanical properties.

AS9100D Certified
ISO 9001:2015
Full Traceability

Industries We Serve

Custom fasteners for critical assembly applications

Aerospace

Engine bolts, structural fasteners, panel screws

Defence

Weapon systems, vehicle assembly, armor mounting

Oil & Gas

Pressure vessel bolts, flange studs, subsea equipment

Industrial

Machine assembly, equipment mounting, maintenance

Marine

Deck hardware, engine room, saltwater-resistant fasteners

Automotive

Engine assembly, chassis, suspension components

Construction

Structural bolts, anchor bolts, heavy equipment

Medical

Surgical instruments, diagnostic equipment, cleanroom

Frequently Asked Questions

Common questions about custom fastener manufacturing

What is your minimum order quantity for custom fasteners?

We have no strict minimum order quantity for custom fasteners. We can efficiently produce single prototypes for development work or production volumes in the thousands. Setup costs are distributed across the order, so larger quantities offer better per-piece pricing, but we're happy to support your requirements whether you need 10 pieces or 10,000.

Can you manufacture fasteners to military or aerospace specifications?

Yes, we manufacture fasteners to military specifications (MS, NAS, AN) and aerospace standards. We can provide complete documentation including AS9102 First Article Inspection Reports, material certifications with full traceability, mechanical test data, and coating certifications. Our AS9100D certification ensures we meet aerospace quality requirements with proper documentation and control throughout manufacturing.

What thread tolerances can you achieve?

We routinely achieve 2A/2B thread class for general applications and 3A/3B for precision requirements. Metric threads are typically manufactured to 6g/6h tolerance class. Thread rolling produces superior strength and surface finish compared to cut threads. We verify all threads with calibrated plug/ring gauges and can provide thread inspection reports showing major diameter, minor diameter, and pitch diameter measurements.

Do you provide heat treatment and plating services?

Yes, we provide complete heat treatment services including through hardening, case hardening, and tempering to achieve specific strength grades (Grade 5, Grade 8, etc.). Surface treatments include zinc plating (clear, yellow, or black chromate), cadmium plating for aerospace, black oxide, passivation for stainless steel, and specialty coatings like PTFE or electroless nickel. All treatments include certifications and test documentation.

Can you match existing fasteners or reverse-engineer replacements?

Yes, we can reverse-engineer replacement fasteners from samples. Send us the existing fastener and we'll measure thread pitch, diameter, length, head style, material, and any special features. We can then manufacture exact replacements or improved designs with better materials or coatings. For critical applications, we recommend providing original specifications if available to ensure proper strength grades and certifications.

What is the typical lead time for custom fasteners?

Lead times vary based on complexity, quantity, material, and finishing requirements. Simple custom fasteners from stock materials typically take 2-3 weeks. Fasteners requiring special materials, heat treatment, or plating may take 3-4 weeks. Complex multi-diameter or specialty fasteners may require 4-6 weeks. High-volume production orders are quoted based on quantity. Rush services available for urgent requirements.

What file formats do you accept for custom fastener drawings?

We accept PDF, DWG, DXF, STEP, IGES, and most common CAD formats. Even hand sketches with critical dimensions clearly marked are acceptable. At minimum, we need thread specification (M8x1.25, 1/4-20 UNC, etc.), length, head style, and material. If you don't have drawings, we can work with you to define the fastener specifications based on your application requirements.

Do you provide material certifications and test reports?

Yes, all custom fasteners include material test reports (MTR) with full traceability to heat lot. For aerospace applications, we provide AS9102 First Article Inspection Reports, Certificate of Conformance (C of C), mechanical test data (tensile strength, proof load, hardness), coating certifications, and any additional testing required by your specifications. All documentation includes batch/lot traceability for complete accountability.

Get a Quote for Your Custom Fasteners

Upload your fastener specifications or drawings for a detailed quote. Our engineering team will review your requirements and recommend optimal materials, thread specifications, and surface treatments to meet your assembly needs.