Screws, Bolts

Part Number	Description / PDF	Quantity
PSMS 008 0050 PH B&F Fastener Supply	SHT METAL SCREW PAN PHILLIPS #8	2720
6X3/4 HHSMS B&F Fastener Supply	SHEET METAL SCREW HEX SLOTTED #6	1800
NY PMS 832 0025 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 8-32	2600
NY PMS 632 0100 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 6-32	9400
HMSSS 104 0200 B&F Fastener Supply	MACH SCREW HEX #10-24	840
PMSSS 256 0050 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 2-56	2700
PMSSS 632 0050 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 6-32	9671
NY PMS 832 0075 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 8-32	360
HHSS 025 0150 20 B&F Fastener Supply	CAP SCREW HEX 1/4"-20	0
PMS 632 0025 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 6-32	48575
HMSSS 104 0125 B&F Fastener Supply	MACH SCREW HEX #10-24	720
HMSSS 832 0125 B&F Fastener Supply	MACH SCREW HEX #8-32	50
PMSSS 102 0050 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 10-32	7000
PMSSS 832 0075 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 8-32	2500
4X3/8 HHSMS B&F Fastener Supply	SHEET METAL SCREW HEX SLOTTED #4	2100
NY PMS 832 0038 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 8-32	100
HHSS 050 0100 13 B&F Fastener Supply	CAP SCREW HEX 1/2"-13	990
PMSSS 256 0025 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 2-56	10800
PMS 632 0044 SL B&F Fastener Supply	MACH SCREW PAN HEAD SLOTTED 6-32	19700
PMSSS 440 0031 PH B&F Fastener Supply	MACHINE SCREW PAN PHILLIPS 4-40	3800

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