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Screws, Bolts

Image Part Number Description / PDF Quantity Rfq
021032A025

021032A025

Richco, Inc. (Essentra Components)

82 SLOTTED CSK SCREW 10-32 THREA

1000
50M020040N025

50M020040N025

Richco, Inc. (Essentra Components)

PAN SLOTTED SCREW, M2 X .4 THREA

1905
012520WF037

012520WF037

Richco, Inc. (Essentra Components)

FILLISTER PHILLIPS SCREW 1/4-20

0
010632X075

010632X075

Richco, Inc. (Essentra Components)

HEX SLOTTED HEAD BOLT, NATURAL,

5998
010632S050

010632S050

Richco, Inc. (Essentra Components)

SET SCREW SLOTTED HEAD 6-32 THRE

940
010832CD018

010832CD018

Richco, Inc. (Essentra Components)

BINDER COMBINATION SCREW 8-32

0
50M035060H025

50M035060H025

Richco, Inc. (Essentra Components)

90 SLOTTED CSK SCREW, M3.5 X .6

2000
011032F106

011032F106

Richco, Inc. (Essentra Components)

FILLISTER SLOTTED SCREW 10-32

0
010632B015

010632B015

Richco, Inc. (Essentra Components)

BINDER SLOTTED SCREW 6-32 THRE

0
012520F175

012520F175

Richco, Inc. (Essentra Components)

FILLISTER SLOTTED SCREW 1/4-20

0
NSS-4-7-01

NSS-4-7-01

Richco, Inc. (Essentra Components)

MACH SCREW PAN HEAD SLOTTED 4-40

6315
50M060100H016

50M060100H016

Richco, Inc. (Essentra Components)

90 SLOTTED CSK SCREW, M6 X 1 THR

4984
50M040070R006

50M040070R006

Richco, Inc. (Essentra Components)

SET SCREW, SLOTTED HEAD, M4 X .7

4630
020440A137

020440A137

Richco, Inc. (Essentra Components)

82 SLOTTED CSK SCREW 4-40 THR

0
010832B125

010832B125

Richco, Inc. (Essentra Components)

BINDER SLOTTED SCREW 8-32 THREAD

975
011032P175

011032P175

Richco, Inc. (Essentra Components)

PAN SLOTTED SCREW 10-32 THREAD 1

1000
010256H075

010256H075

Richco, Inc. (Essentra Components)

HEX UNSLOTTED BOLT 2-56 THREAD 3

1965
010440S018

010440S018

Richco, Inc. (Essentra Components)

SET SCREW SLOTTED HEAD 4-40 THRE

1000
0137516EYEB100

0137516EYEB100

Richco, Inc. (Essentra Components)

EYE BOLT 3/8-16 THREAD 3/4 ID 7/

500
0325020250B

0325020250B

Richco, Inc. (Essentra Components)

UNSLOTTED HEX BOLT, 1/4-20 THREA

500

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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