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Screws, Bolts

Image Part Number Description / PDF Quantity Rfq
M0171-SS

M0171-SS

RAF

PANEL SCREW KNOB SLOTTED M3X0.5

1536
M0184-SS

M0184-SS

RAF

CAPTIVEPANELSCREWSTYLE2

436
M0216-SS

M0216-SS

RAF

8MM HD X 27MM X M4 THD

187
6903-SS

6903-SS

RAF

SHOULDER SCREW HEX #4-40

83
0116-SS-20

0116-SS-20

RAF

7/16HD X 11/16 X 8-32 THD

200
M0277-SS

M0277-SS

RAF

PANEL SCREW PAN SLOT M2.5X0.45

543
0101-SS-20

0101-SS-20

RAF

5/16HD X 23/32 X 4-40 THD

400
0167-SS

0167-SS

RAF

7/16HD X 1.00 X 10-32 THD

95
0847-SS

0847-SS

RAF

1/4HD X 5/8 X 8-32 THD

490
0367-SS

0367-SS

RAF

1/4HD X 3/8 X 4-40 THD

0
6936-SS

6936-SS

RAF

SHOULDER SCREW HEX #10-32

0
7104-SS

7104-SS

RAF

3/8HD X 7/16 TL X 6-32 THD

141
0823-SS

0823-SS

RAF

PANEL SCREW PAN SLOTTED #4-40

6
M0181-SS

M0181-SS

RAF

PANEL SCREW KNOB SLOTTED M3X0.5

328
0161-SS

0161-SS

RAF

7/16HD X 5/8 X 10-32 THD

220
6935-SS

6935-SS

RAF

SHOULDER SCREW HEX #10-32

0
M0312-SS

M0312-SS

RAF

6.4MM HD X 14.5MM X M4 THD

539
6908-SS

6908-SS

RAF

9/32HD X 0.1250 X 6-32 THD

200
M0351-SS

M0351-SS

RAF

6.4MM HD X 13.5MM X M3 THD

395
M0176-SS

M0176-SS

RAF

6.5MM HD X 19MM X M3 THD

499

Screws, Bolts

1. Overview

Screws and bolts are threaded fasteners designed to mechanically join materials. Defined by their helical threads and head configurations, these components enable removable or permanent assemblies in engineering applications. Their importance in modern technology stems from their ability to provide high clamping forces, ease of installation, and adaptability across industries ranging from aerospace to consumer electronics.

2. Main Types and Functional Classification

TypeFunctional CharacteristicsApplication Examples
Hex BoltHigh torque transmission, hexagonal head for wrenchingStructural steel connections in construction
Socket Head Cap ScrewInternal hex drive, cylindrical head for precise torqueMachinery assemblies requiring flush mounting
Self-Tapping ScrewDrills own thread in mating material during installationMetal sheet joining in HVAC systems
Carriage BoltDome head with square neck to prevent rotationWood-to-metal fastening in furniture
Anchor BoltExpandable end for concrete substrate anchoringFoundation connections in industrial equipment

3. Structure and Composition

Typical configurations include: - Head (hexagonal, cylindrical, or countersunk) - Bearing surface (under-head contact area) - Shank (unthreaded cylindrical section) - Threaded portion (metric or imperial pitch) - Point (tapered or blunt end) Materials range from carbon steel (grades 4.8-12.9) to stainless steel (A2/A4), titanium, and specialty alloys. Surface treatments include zinc plating, galvanization, and phosphate coatings.

4. Key Technical Parameters

ParameterSignificance
Tensile Strength (MPa)Determines maximum axial load capacity
Proof Load (MPa)Maximum stress before plastic deformation
Hardness (HV/HRC)Indicates wear resistance and brittleness
Thread Pitch (mm/TPI)Dictates engagement quality and assembly speed
Corrosion Resistance ClassMeasured by salt spray test hours (e.g., ISO 9227)

5. Application Fields

  • Automotive: Cylinder head bolts (torque-to-yield), wheel studs
  • Aerospace: NAS/AN standard fasteners in airframe assemblies
  • Construction: M20+ diameter bolts in steel bridges
  • Electronics: 0-80 UNF screws in circuit board mounting
  • Renewables: Wind turbine tower segment connections

6. Leading Manufacturers

ManufacturerKey Products
Hilti CorporationHIT-HY 150 MAX adhesive anchors
Bossard GroupDelta PT self-tapping screws for aluminum
Stanley Black & DeckerFASTORQ structural hex bolts
ARaymondPush-on quick-connect fasteners for automotive

7. Selection Guidelines

Key considerations:

  1. Material compatibility (e.g., stainless steel in marine environments)
  2. Load requirements (static vs. dynamic loading conditions)
  3. Environmental exposure (temperature range, chemical contact)
  4. Installation method (manual vs. automated torque-controlled tools)
  5. Cost optimization (balance between performance and budget)

Example: Selecting A4-70 stainless bolts for coastal infrastructure projects ensures seawater resistance while maintaining 700MPa tensile strength.

8. Industry Trends

Current developments include:

  • Hybrid composite fasteners for weight reduction in EVs
  • Smart bolts with embedded strain sensors (IoT integration)
  • Self-lubricating coatings reducing installation torque variability
  • Additive manufacturing of customized thread profiles
  • Sustainability initiatives: Recyclable alloy development and process energy reduction
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