Screws, Bolts

Part Number	Description / PDF	Quantity
31037062 Richco, Inc. (Essentra Components)	SHOULDER SCREW, HEX SOCKET, 5/16	500
010440R056 Richco, Inc. (Essentra Components)	ROUND SLOTTED SCREW 4-40 THREAD	1000
50M060100D060 Richco, Inc. (Essentra Components)	CHEESE SLOTTED SCREW, M6 X 1 THR	1500
3437516100 Richco, Inc. (Essentra Components)	HEX SOCKET CAP SCREW, 3/8-16 THR	500
091024125T Richco, Inc. (Essentra Components)	KNURLED THUMB SCREW 10-24 THREAD	985
010440CD118 Richco, Inc. (Essentra Components)	BINDER COMBINATION SCREW 4-40 TH	975
010440F025PC Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW 4-40 T	0
50M030050M006 Richco, Inc. (Essentra Components)	90 PHILLIPS CSK SCREW, M3 X .5 T	1982
50M040070D008 Richco, Inc. (Essentra Components)	CHEESE HEAD SLOTTED SCREW, NATUR	14521
50M025045F006 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW, M2.5 X	1182
012520WF025 Richco, Inc. (Essentra Components)	FILLISTER PHILLIPS SCREW 1/4-20	0
010348F037 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW 3-48 T	0
50M060100P070 Richco, Inc. (Essentra Components)	PAN PHILLIPS SCREW, M6 X 1 THREA	974
NSP-6-2-01 Richco, Inc. (Essentra Components)	MACHINE SCREW PAN PHILLIPS 6-32	1592
011024F062 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW 10-24	0
091032025TEG Richco, Inc. (Essentra Components)	SLOTTED THUMB SCREW 10-32 THREAD	1000
50M035060D035 Richco, Inc. (Essentra Components)	CHEESE SLOTTED SCREW, M3.5 X .6	1950
021024A025 Richco, Inc. (Essentra Components)	82 SLOTTED CSK SCREW 10-24 THREA	1000
0131218EYEB100 Richco, Inc. (Essentra Components)	EYE BOLT 5/16-18 THREAD 5/8 ID 7	500
50M030050K030 Richco, Inc. (Essentra Components)	HEX SLOTTED SCREW, M3 X .5 THREA	1900

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