SCREWINDUSTRY.COM: Screws and Fastener Solutions

1. Products & Capabilities
2. Fastener Types

• General Types:
• Screws, Rivets, Bolts, Nuts, Pins
• Standards & Specials
• SEMS & Fasteners
• Self-Drilling & Self-Tapping
• Machine Screws
• Hex Lag Bolts
• Shoulder Bolts
• Carriage Bolts
• Socket Head Cap Screws
• Thumb Screws
• And more!
• Specific Fastener Types & Capabilities:
• Tri-Round (Taptite Equivalent)
• SEMS & Double SEMS
• Specials
• Hex Head Cap Screws
• Machine Screws
• Double Ended Studs
• Socket Head Cap Screws
• “T” Bolts
• Multi-Die Parts

1. SEMS Screw Capabilities

• “Pre-assembled fasteners with a free-spinning washer”
• Types:
• Conical
• Double Washer
• Terminal
• External Tooth
• Internal Tooth
• Square Dome
• Custom SEMS

1. Thread Types

• Coarse & Fine Threads
• Thread Cutting
• Thread Tapping
• High-Low Threads
• MAThread (Licensed)

1. Headers

• Single Die:
• 3/16′′ Single
• 1/4″ L/S Single
• 5/16′′ Single
• 3/8′′ Single
• 1/2′′ Single
• Multi-Die

1. Rollers

• Types:
• SEMS
• “0”
• 10′′
• “20”
• ′′30″
• Double Washer SEMS
• Hand Feeds

1. Plant Information

• Headers
• Single-Die Headers: 3/16 National, 3/16 High-Pro, 1/8 National, 1/4 Chun Zu, 1/4 Long Stroke, 5/16 Header, 3/8 Header, 1/2 Header, Okuma, Sakamura
• Multi-Blow Headers: PF 630, PF 860, Chun Zu
• Rollers
• Straight Rollers: 0-400 Hartford, 10-300 Hartford, 10-400 Hartford, 0 Waterbury Hand-Fed
• SEMS Rollers: 10-300 Hartford, 0 Waterbury, 00 Waterbury, 10 Small-Dial Waterbury, 0-400 Hartford, Double Washer Waterbury

1. Manufacturing Capabilities

• Specifications:
• M2 to M12 up to 155MM Long
• #2 to 21′′ up to 6′′ Long
• Heading – Single & Multi-Die
• Rolling – Straight, SEMS, Double Washer, Hand-feed
• MAThread Licensed
• Import Program

1. In-House Engineering

• Application Problem Solving:
• Bolt Loosening
• Cam Out
• Strip Out
• Thread Forming
• Fit/Clamping
• Proposal Drawings
• Sample Runs
• Plating Recommendations:
• Color
• Salt Spray

1. Processes
2. Manufacturing Processes

• Trim
• Mill Slot
• Shank Slot
• Screw Machine
• Shave
• Pointing
• Drill & Tap
• Broaching

1. Heat Treating

• What is it? Controlled heating and cooling to alter the physical and mechanical properties of steel.
• Characteristics: Tensile Strength, Ductility, Wear Resistance
• Types:
• Case Hardening (Carbonitriding):
• Used for: Thread Cutting/Forming
• Core Hardness: HRC 28-36
• Case Hardness: HRC 45 MIN
• Neutral Hardening (Grades & Class):
• Used for: Machine Screws & Bolts
• Uniform hardness throughout the part
• Hardness: HRC 28-36
• Process Steps:

1. Hardening: Heat to 1600°F-1675°F
2. Soaking: Maintain temperature for a specific period
3. Quenching: Rapid cooling for a hard, brittle structure
4. Tempering: Reheat to 550°F – 1000°F for durability and desired hardness

• Testing: Micro Hardness Tester, Rockwell Hardness Tester

1. Plating & Finishing

• What is it? Surface treatment to protect and enhance steel parts.
• Characteristics: Corrosion Resistance, Torque Control, Appearance (Shiny/Flat), Color
• Types:
• Electro: Zinc, Cadmium, Nickel
• Dip & Spin: Magni, Geomet, Dorken, Black Oxide, Zinc Iron, and more!
• Specific Finish Options:
• Zinc Electro-Plate (Zn): Shiny, silver, bulk application, post-finish colors. Concern: Hydrogen Embrittlement
• Black Oxide (Black Ox, P): Matte black, corrosion resistance, reduced friction.
• Passivation: Cleans the surface, uniform appearance, corrosion resistance.
• Trivalent Chromium & Nickel: Shiny, decorative, corrosion resistance, increased hardness. Concerns: Environmental & health, expensive.
• Dip & Spin Coating: Flat appearance, bulk application, many colors, high corrosion resistance (1000+ hrs). Concerns: Recess fill, gaging issues, washer sticking.
• Salt-Spray Hours: Various options available for white and red rust resistance.

1. Other Secondary Operations

• Drilling
• Tapping
• Bending
• Broaching
• Shaving
• Grinding
• Captivating
• Burnishing
• Grooving
• Head Painting
• Induction Hardening
• Poly Packaging & Kitting
• Stamping
• Pointing
• Nylon and Adhesive Patches

III. Materials

• Copper
• Steel
• Bronze
• Stainless
• Aluminum
• Brass
• Titanium
• Steel Types: 1022, 10B21, 4037
• Stainless Steel Types: 302, 316, 410, 430, A270, A286
• Other Materials: Brass, Aluminum, Copper, Bronze, Nylon

1. Material Grades

• SAE Grade: 2, 5, 5.1, 8 (Lap Free Threads)
• Metric Grade: 4.8, 8.8, 9.8, 10.9, 12.9 (Lap Free Threads)

1. Engineering Details
2. Cold-Heading Basics

1. Cutoff: Wire is fed and cut to length.
2. Blank Die: Cut piece is forced into the die.
3. 1st Blow: Initial head formation.
4. 2nd Blow: Further head formation.
5. 3rd Blow: Shoulder and drive formation.
6. Ejection: Finished blank is ejected.
• High-speed process (hundreds of pieces per minute)

1. Thread Rolling Basics

1. Blanks Loading: Blanks are loaded and oriented.
2. Washer Loading (SEMS): Washers are loaded and oriented separately.
3. Rolling: Flat roll dies form threads via high-speed compression.
4. Ejection: Threaded fasteners are ejected.
• Cold-rolled threads are stronger than cut threads due to better grain flow.

1. Lap-Free Threads

• Importance: Proper alignment prevents laps in threads, ensuring stronger fasteners.

1. MAThread

• Eliminates cross-threading
• Corrects off-angle installations
• Forces alignment
• Available in any material, size, head style, or drive

1. High-Low Threads

• Applications: Particle Board, Wood, Plastics
• Advantages:
• Reduced cracking in plastic bosses
• Increased pull-out strength
• Can be combined with SEMS washers
• 30-degree high thread = Lower drive torque
• Any head style or drive

1. Screw Types & Point Styles

• Thread Cutting Screws: Used when chips are acceptable, eliminates separate tapping.
• Tri-Roundular Thread-Forming Screws: Saves assembly costs, eliminates tapping, low drive torque, self-locking, no chips.
• Self-Drilling Screws: Eliminates pre-drilling, ensures correct hole size, quick assembly.
• Self-Piercing Screws: Pierces and forms threads, used for sheet metal and wood.
• Other Point Styles: Cone, Cup (various types), Oval, Flat, Rolled, Pinch, Nail, Half-Dog. Each serves a specific purpose (e.g., permanent setting, quick assembly, frequent relocation).

1. Screw Thread Terminology

• Pitch
• Thread Angle
• Depth
• Helix Angle
• Root
• Crest
• Minor Dia
• Pitch Dia.
• Major Dia

1. Quality Control
2. Processes & Monitoring

• Improve Efficiencies, Reduce PPM
• Engineering Analysis
• Assurance, Optimal Brand
• Verification
• Guaranty
• Price
• Decrease Lead-Time
• Requirements
• Quality
• Warranty, Customers
• Merchandise, Design, Inspection
• Success
• Zero Defects, Improvement, Satisfaction, Testing
• Management Control
• Process Monitors
• Run-Up Detectors

1. Inspections & Certifications

• First Article Inspections/ISIR
• Lot Completion Inspections
• Secondary Process Inspections
• Final Product Inspections
• Statistical Process Control
• Customer Satisfaction
• Standard Efficiency
• Reliability Process
• Quality Control: Criteria, Check, Guarantee

1. Lot Traceability

• Raw Material to Completed Product
• PPAP’s
• Full Certifications

1. Testing

• Mechanical Testing
• Drive Torque
• Ductility
• Rockwell Hardness
• Hydrogen Embrittlement
• Hardness Testing

1. Certifications

• ISO 9001:2015: Quality Management System Certificate
  ISO 14001:2015: Environmental Management System Certificate
  ISO 45001:2018: Occupational Health and Safety Management System Certificate
  ISO 27701:2019: Privacy Information Management System Certificate
  ISO 10002:2018: Customer Satisfaction Management System Certificate
  AS9100D: Quality Management System (QMS) for Aerospace Industry

1. Specific Inspection Procedures

• Heading Inspections: First Piece, In-Process, Lot Completion
• Rolling Inspections: First Piece, In-Process, Lot Completion
• Secondary Process Inspections: Each Process, Each Lot
• Final Inspections: Each Lot

1. Grain Flow Analysis

• How to Check: Cut blank in half, clean in acid, view under a microscope.
• Why Check: Proper grain flow ensures better ductility and reduces the likelihood of failure.

1. Custom Import Services

• Products: Screws, Bolts, Washers, Nuts
• Expertise:
• Experienced Importers
• Global Supply Chain (Audited, Monitored, Scored)
• Blanket Releases
• Accredited Custom Ordering Quantities
• Blended Supply

1. Additional Imported Products

• Steel Channel
• Forgings
• Castings
• Stampings
• Custom Assemblies
• Rubber Products
• Quick Release Pins
• Assembly Pins
• Wire Forms
• Rubber Hose Assemblies
• Brass Nut Assemblies
• Machine Screw Products
• Chains
• Gears

VII. Partnership & Support

• Import Program
• Fast Quotes
• Improved without Break-In Charges
• Short Lead Time
• In-House Design
• Engineering Support
• Help with Application Issues
• Plant Visits
• Credit Terms
• Smart Cert
• Blanket Orders (One year from the time of the first release)
• Made in Turkey

VIII. The SCREWINDUSTRY.COM Difference

• Fastener Design Assistance
• Application Review
• Redesign of Current Screw Machine Parts to Cold Headed Parts
• Alternative Assembly Methods
• Installation, Warranty & Application Issues
• Consolidation/Risk Management Efforts
• Training
• Failure Analysis