Screws, Bolts

Part Number	Description / PDF	Quantity
010440F175 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW 4-40 THR	1030
011032CD012 Richco, Inc. (Essentra Components)	BINDER COMBINATION SCREW 10-32 T	1000
010832PW062 Richco, Inc. (Essentra Components)	PAN PHILLIPS SCREW 8-32 THREAD 5	855
020440A056 Richco, Inc. (Essentra Components)	82 SLOTTED CSK SCREW 4-40 THR	0
50M060100P010 Richco, Inc. (Essentra Components)	PAN PHILLIPS SCREW, NATURAL, NYL	9958
010832B028 Richco, Inc. (Essentra Components)	BINDER SLOTTED SCREW 8-32 THRE	0
3404400075 Richco, Inc. (Essentra Components)	HEX SOCKET CAP SCREW, #4-40 THRE	4577
022520A100 Richco, Inc. (Essentra Components)	COUNTER SUNK SCREW, SLOTTED, 82	26900
011024B125 Richco, Inc. (Essentra Components)	BINDER SLOTTED SCREW 10-24 THREA	955
090832037TEG Richco, Inc. (Essentra Components)	SLOTTED THUMB SCREW 8-32 THREAD	995
010832B200 Richco, Inc. (Essentra Components)	BINDER SLOTTED SCREW 8-32 THRE	0
010256F009 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW 2-56 THR	4885
010440CD037 Richco, Inc. (Essentra Components)	BINDER COMBINATION SCREW 4-40 TH	11030
50M060100N035 Richco, Inc. (Essentra Components)	PAN SLOTTED SCREW, M6 X 1 THREAD	2000
50M030050G020 Richco, Inc. (Essentra Components)	FILLISTER PHILLIPS SCREW, M3 X .	1700
010256F028 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW 2-56 T	0
020632A025 Richco, Inc. (Essentra Components)	COUNTER SUNK SCREW, SLOTTED, 82	14420
010632H056 Richco, Inc. (Essentra Components)	HEX UNSLOTTED BOLT 6-32 THREAD 9	893
010348F075 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW 3-48 T	0
50M030050F016 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW, M3 X .5	1995

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

Type	Functional Characteristics	Application Examples
Hex Bolt	High torque transmission, hexagonal head for wrenching	Structural steel connections in construction
Socket Head Cap Screw	Internal hex drive, cylindrical head for precise torque	Machinery assemblies requiring flush mounting
Self-Tapping Screw	Drills own thread in mating material during installation	Metal sheet joining in HVAC systems
Carriage Bolt	Dome head with square neck to prevent rotation	Wood-to-metal fastening in furniture
Anchor Bolt	Expandable end for concrete substrate anchoring	Foundation 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

Parameter	Significance
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 Class	Measured 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

Manufacturer	Key Products
Hilti Corporation	HIT-HY 150 MAX adhesive anchors
Bossard Group	Delta PT self-tapping screws for aluminum
Stanley Black & Decker	FASTORQ structural hex bolts
ARaymond	Push-on quick-connect fasteners for automotive

7. Selection Guidelines

Key considerations:

Material compatibility (e.g., stainless steel in marine environments)
Load requirements (static vs. dynamic loading conditions)
Environmental exposure (temperature range, chemical contact)
Installation method (manual vs. automated torque-controlled tools)
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