Screws, Bolts

Part Number	Description / PDF	Quantity
50M030050L010 Richco, Inc. (Essentra Components)	90 SLOTTED CSK SCREW, M3 X .5 TH	3000
50M030050K005 Richco, Inc. (Essentra Components)	HEX SLOTTED SCREW, M3 X .5 THREA	1925
50M040070F030 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW, M4 X .7	2000
3262511075 Richco, Inc. (Essentra Components)	SLOTTED HEX SCREW, 5/8-11 THREAD	250
50M100150J025 Richco, Inc. (Essentra Components)	HEX HEAD BOLT, NATURAL, NYLON 6/	4952
010440T062 Richco, Inc. (Essentra Components)	SET SCREW SOCKET HEAD 4-40 THREA	1000
50M050080D008 Richco, Inc. (Essentra Components)	CHEESE SLOTTED SCREW, M5 X .8 TH	2000
010832P100 Richco, Inc. (Essentra Components)	PAN SLOTTED MACHINE SCREW, NATUR	10010
011032H150 Richco, Inc. (Essentra Components)	HEX UNSLOTTED BOLT 10-32 THREAD	800
010832H075 Richco, Inc. (Essentra Components)	HEX UNSLOTTED BOLT 8-32 THREAD 3	750
3431218100 Richco, Inc. (Essentra Components)	SOCKET HEAD BOLT, NATURAL, NYLON	4950
010256CD100 Richco, Inc. (Essentra Components)	BINDER COMBINATION SCREW 2-56 TH	705
010832F018 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW 8-32 THR	1000
011032PW062 Richco, Inc. (Essentra Components)	PAN SLOTTED SCREW, NATURAL, NYLO	3906
50M060100R005 Richco, Inc. (Essentra Components)	SET SCREW, SLOTTED HEAD, M6 X 1	3500
010440T100 Richco, Inc. (Essentra Components)	SET SCREW SOCKET HEAD 4-40 THREA	1000
NSP-8-7-01 Richco, Inc. (Essentra Components)	MACHINE SCREW PAN PHILLIPS 8-32	9128
31025025 Richco, Inc. (Essentra Components)	SHOULDER SCREW, HEX SOCKET, #10-	500
3431218300 Richco, Inc. (Essentra Components)	HEX SOCKET CAP SCREW, 5/16-18 TH	500
3408320028 Richco, Inc. (Essentra Components)	HEX SOCKET CAP SCREW, #8-32 THRE	2000

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