Screws, Bolts

Part Number	Description / PDF	Quantity
NSP-4-4-01 Richco, Inc. (Essentra Components)	MACHINE SCREW PAN PHILLIPS 4-40	0
0101024EYEB100 Richco, Inc. (Essentra Components)	EYE BOLT 10-24 THREAD 3/8 ID 7/8	500
3408320075 Richco, Inc. (Essentra Components)	HEX SOCKET CAP SCREW, #8-32 THRE	4000
50M050080P015 Richco, Inc. (Essentra Components)	PAN PHILLIPS SCREW, M5 X .8 THRE	1990
012520R050 Richco, Inc. (Essentra Components)	ROUND SLOTTED SCREW, NATURAL, NY	13710
010256P012 Richco, Inc. (Essentra Components)	PAN SLOTTED SCREW 2-56 THREAD 1/	896
012520WF250 Richco, Inc. (Essentra Components)	FILLISTER PHILLIPS SCREW 1/4-20	0
50M050080H020 Richco, Inc. (Essentra Components)	90 SLOTTED CSK SCREW, M5 X .8 TH	2975
50M080125F020 Richco, Inc. (Essentra Components)	FILLISTER SLOTTED SCREW, M8 X 1.	500
0337516150B Richco, Inc. (Essentra Components)	UNSLOTTED HEX BOLT 3/8-16 THREAD	500
50M040070T008 Richco, Inc. (Essentra Components)	SLOTTED THUMB SCREW, M4 X .7 THR	1975
092520100TB Richco, Inc. (Essentra Components)	KNURLED THUMB SCREW 1/4-20 THREA	328
020440B018 Richco, Inc. (Essentra Components)	100 SLOTTED CSK SCREW 4-40 THREA	950
010440P043 Richco, Inc. (Essentra Components)	PAN SLOTTED SCREW 4-40 THREAD 7/	1000
50M020040N016 Richco, Inc. (Essentra Components)	PAN SLOTTED SCREW, M2 X .4 THREA	1680
3425280025 Richco, Inc. (Essentra Components)	HEX SOCKET CAP SCREW, 1/4-28 THR	4998
0337516125FXM225 Richco, Inc. (Essentra Components)	HEX FLANGE BOLT 3/8-16 THREAD 1	470
0337516125B Richco, Inc. (Essentra Components)	UNSLOTTED HEX BOLT 3/8-16 THREAD	1000
50M020040G004 Richco, Inc. (Essentra Components)	FILLISTER PHILLIPS SCREW, M2 X .	6621
010440H050 Richco, Inc. (Essentra Components)	HEX UNSLOTTED BOLT 4-40 THREAD 1	975

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