PLOW BOLT

1. Industry Context

Plow bolts are specialized structural fasteners engineered for high-abrasion, flush-surface, heavy-load applications where protruding bolt heads are unacceptable.

Unlike conventional hex bolts, plow bolts are designed to:

• Maintain surface continuity
• Resist impact and sliding abrasion
• Provide high clamp force under cyclic loading
• Prevent material hang-up in moving assemblies

They are critical fastening solutions across industries involving:

Industry	Functional Requirement
Mining Equipment	Wear plate retention
Earthmoving Machinery	Blade and bucket attachment
Agriculture	Moldboard plows & cultivators
Railways	Track & wear plate fastening
Construction	Heavy steel contact surfaces
Shipbuilding	Abrasion-resistant deck fittings
Oil & Gas	Material handling systems
Power Plants	Conveyor & ash handling equipment

SM Fasteners manufactures plow bolts for global EPC and OEM applications, aligned with ISO 9001 quality systems and export-grade traceability.

2. Technical Definition

A Plow Bolt is a flat or countersunk head bolt with a square neck beneath the head designed to:

1. Seat flush with equipment surfaces.
2. Prevent rotation during tightening.
3. Transfer load into the parent material.

Key Geometry Elements

• Flat countersunk head (typically 82° or 90°)
• Square neck anti-rotation feature
• Partially or fully threaded shank
• Heavy-duty load transmission design

Functional Principle

The square neck embeds into a matching square hole, allowing tightening from one side — critical for confined industrial assemblies.

3. Functional Role in Assemblies

Plow bolts serve three primary engineering functions:

3.1 Flush Surface Retention

Prevents:

• Material buildup
• Mechanical interference
• Abrasive wear concentration

3.2 High Clamp Force Transfer

Provides stable preload maintaining contact pressure between:

• Wear plate → base structure
• Blade → moldboard
• Liner → chute wall

3.3 Impact Resistance

The countersunk head distributes impact loads into surrounding material rather than concentrating stresses.

4. Load Mechanics & Force Behavior

Plow bolts operate primarily under combined loading conditions.

Applied Loads

Load Type	Engineering Effect
Tensile	Preload generation
Shear	Sliding resistance
Impact	Shock load absorption
Fatigue	Cyclic equipment operation
Abrasion	Head surface wear

4.1 Preload Concept

Fastener performance depends on controlled elastic stretching.$$F_p = \frac{T}{K \times d}$$

Where:

• $F_p$​ = Preload force (N)
• $T$= Torque (Nm)
• $K$= Nut factor (≈0.18–0.22)
• $d$ = Nominal diameter (m)

Proper preload ensures:

• No joint separation
• Reduced fatigue stress
• Stable frictional resistance

4.2 Torque–Tension Relationship

Only ~10% of applied torque produces preload.

Energy Distribution	Percentage
Thread friction	40–50%
Under-head friction	40–45%
Useful clamping force	10–15%

SM Fasteners applies controlled lubrication and coating processes to stabilize torque coefficients.

4.3 Shear Load Transfer

Unlike shear pins, plow bolts rely on:

• Friction between plates
• Clamp force retention

Shear failure occurs when preload drops below design requirement.

4.4 Countersunk Head Stress Behavior

The head transfers compressive stresses radially.

Benefits:

• Reduced stress concentration
• Improved fatigue life
• Enhanced wear resistance

5. Joint Design Principles

5.1 Countersink Geometry Requirement

Incorrect countersink angles cause:

• Head cracking
• Uneven load distribution
• Premature loosening

Typical match:

Bolt Head	Countersink
82°	ANSI applications
90°	ISO/DIN equipment

5.2 Minimum Thread Engagement

Material	Engagement Length
Steel	1 × diameter
Cast Iron	1.5 × diameter
Aluminum	2 × diameter
Polymer / PEEK	2.5 × diameter

5.3 Preload Design Rule

Recommended preload:$$F_p = 70\% \text{ of proof load}$$

Ensures:

• Elastic operation
• No yielding
• Maximum fatigue resistance

5.4 Anti-Rotation Mechanics

Square neck prevents rotation by:

• Plastic deformation into mating hole
• Friction locking
• Mechanical interlock

Essential for single-side installation.

5.5 Failure Mechanisms

Fatigue Failure

Occurs under fluctuating loads.

Mitigation:

• Proper preload
• Rolled threads
• Surface finishing control

Shear Failure

Caused by insufficient clamp load.

Hydrogen Embrittlement

Risk in high-strength coated bolts.

SM Fasteners controls:

• Baking procedures
• Coating chemistry

Stress Corrosion Cracking

Relevant in:

• Offshore
• Chemical plants
• Sour service environments

NACE MR0175 compliant materials available.

5.6 Friction & Nut Factor Control

Factors influencing torque accuracy:

• Surface finish
• Coating type
• Lubrication
• Thread tolerance

Typical Nut Factor Values:

Condition	K Value
Dry	0.22
Zinc plated	0.20
Phosphate & oil	0.18
PTFE coated	0.15

5.7 Temperature Effects

Temperature influences preload retention.

Temperature	Effect
<150°C	Minimal loss
200–400°C	Relaxation begins
>450°C	Material selection critical

High-temperature alloys supplied by SM Fasteners include:

• Inconel
• Incoloy
• Hastelloy
• SMO 254

5.8 Role in Abrasion Engineering

Plow bolts are preferred where equipment surfaces must remain smooth:

Examples:

• Snow plows
• Dozer blades
• Conveyor liners
• Crusher wear plates

Flush installation prevents mechanical wear acceleration.

5.9 Engineering Selection Criteria

Parameter	Design Consideration
Load	Tensile + shear
Environment	Corrosion exposure
Temperature	Alloy selection
Maintenance access	One-side tightening
Wear level	Head hardness
Inspection requirement	Traceability level

5.10 Integration within SM Fasteners Quality Systems

Manufacturing and engineering design follow:

• ISO 9001 process control
• UKAF audited quality procedures
• Heat traceability systems
• Lot-level documentation

Ensuring procurement readiness for international projects.

6. Product Types & Engineering Variants

Plow bolts are manufactured in multiple configurations to address wear resistance, load transfer, and installation constraints across heavy industrial equipment.

SM Fasteners supplies standardized and custom-engineered variants meeting EPC and OEM specifications.

6.1 Standard Flat Head Plow Bolt

Primary Industrial Configuration

Characteristics

• Flat countersunk head
• Square neck anti-rotation
• Partial thread
• Flush seating capability

Typical Applications

• Dozer blades
• Agricultural plows
• Scraper equipment
• Rail wear plates

6.2 Dome Head Plow Bolt

Designed for applications where slight projection is acceptable but impact resistance is critical.

Features

• Rounded head geometry
• Reduced impact stress concentration
• Enhanced fatigue resistance

Used in:

• Conveyor systems
• Bulk material handling equipment
• Mining liners

6.3 Rib Neck Plow Bolt

Instead of square neck, ribs bite into softer substrates.

Advantages:

• Higher torque resistance
• Improved installation stability in mild steel
• Reduced hole deformation

6.4 Countersunk Heavy-Duty Mining Plow Bolt

Purpose-built for extreme abrasion.

Engineering Enhancements:

• Increased head thickness
• Induction-hardened head surface
• High-strength alloy steel grades

Used in:

• Crusher liners
• Bucket lips
• Dragline systems

6.5 Full Thread Plow Bolt

Provides:

• Adjustable clamping
• Thin material fastening
• Multi-layer assemblies

Preferred where grip length varies.

6.6 Custom Engineered Plow Bolts — SM Fasteners Capability

SM Fasteners supports engineered solutions including:

• Non-standard countersink angles
• Extra-long shank configurations
• Metric/Imperial hybrid designs
• Special head hardness requirements
• PEEK plow bolt variants for corrosion-critical applications

Custom development follows ISO 9001 controlled engineering workflow.

7. Dimensional Logic & Geometry Design

Plow bolt dimensions are governed by functional load transfer, not only thread size.

7.1 Key Geometric Parameters

Parameter	Engineering Purpose
Head Diameter	Load distribution
Head Angle	Flush seating
Neck Size	Anti-rotation
Grip Length	Clamp control
Thread Length	Nut engagement
Shank Diameter	Shear resistance

7.2 Countersunk Head Geometry

Standard countersink angles:

Standard	Angle
ANSI	82°
ISO/DIN	90°
Heavy equipment OEM	Custom 100°–120°

Incorrect angles create localized stresses leading to head failure.

8. Dimensional Specification Table

Metric Plow Bolt Dimensions (Typical Reference)

Size	Pitch (mm)	Head Dia (mm)	Head Height (mm)	Square Neck (mm)	Thread Length (mm)	Length Range (mm)
M10	1.5	22	6	10	26	30–120
M12	1.75	26	7	12	30	35–150
M16	2.0	34	9	16	38	40–200
M20	2.5	42	11	20	46	50–250
M24	3.0	50	13	24	54	60–300
M30	3.5	60	16	30	65	80–350

Dimensions aligned with heavy equipment manufacturing practices and SM Fasteners production standards.

9. Imperial Dimension Reference (UNC Series)

Size	Threads/Inch	Head Dia (in)	Neck (in)	Typical Length (in)
3/8″	16	0.87	0.375	1–4
1/2″	13	1.10	0.50	1.5–6
5/8″	11	1.35	0.625	2–8
3/4″	10	1.60	0.75	2–10
1″	8	2.00	1.00	3–12

10. Dimensional Design Engineering Principles

Head Diameter Selection

Larger heads:

• Reduce bearing pressure
• Improve fatigue performance
• Increase wear life

Grip Length Rule

$$Grip = Material\ Thickness – Washer\ Compression$$

Incorrect grip causes joint relaxation.

Square Neck Design Logic

The neck must resist torque without yielding.

Design condition:$$\tau = \frac{T}{rA}$$

Where torque-induced shear stress must remain below material yield strength.

11. Applicable International Standards

Plow bolts are often application-standardized rather than governed by a single universal specification.

SM Fasteners manufactures according to combinations of:

ISO Standards

Standard	Scope
ISO 898-1	Mechanical properties
ISO 965	Thread tolerances
ISO 261	Metric threads
ISO 4759	Fastener tolerances
ISO 3506	Stainless steel properties

ASTM Standards

Standard	Application
ASTM A307	General carbon steel
ASTM A325	Structural strength
ASTM A449	High-strength bolts
ASTM A193	High temperature service
ASTM F568M	Metric mechanical properties

DIN Standards

Standard	Scope
DIN 608	Similar carriage/plow configurations
DIN 7991	Countersunk geometry reference
DIN 267	Fastener materials
DIN EN ISO 10642	Countersunk fasteners

British Standards (BS)

Standard	Application
BS 3692	Metric precision fasteners
BS 4190	Imperial fasteners
BS 1768	Mechanical properties

12. Property Class & Strength Systems

Metric Property Classes

Class	Yield Strength (MPa)	Tensile Strength (MPa)
4.6	240	400
8.8	640	800
10.9	940	1040
12.9	1100	1220

ASTM Strength Equivalents

ASTM Grade	Approx Metric Equivalent
A307	Class 4.6
A325	Class 8.8
A449	Class 10.9
A193 B7	High-temperature equivalent

13. Thread Standards & Tolerances

Thread System Comparison

System	Standard	Application
Metric Coarse	ISO 261	Global equipment
Metric Fine	ISO 965	Vibration resistance
UNC	ASME B1.1	North America
UNF	ASME B1.1	High preload joints
BSW	BS 84	Legacy equipment
BSF	BS 84	Fine British threads

Typical Tolerance Classes

Thread	External	Internal
Metric	6g	6H
UNC	2A	2B
Precision	4g6g	4H

SM Fasteners maintains calibrated thread gauges per ISO 17025 traceability.

14. Interchangeability Considerations

Engineering verification required when substituting standards:

• Head angle differences
• Thread pitch mismatch
• Strength class equivalency
• Coating thickness impact

Incorrect interchangeability may cause:

• Improper seating
• Reduced preload
• Fatigue cracking

15. Weight Chart — SM Fasteners Reference Data

(Approximate values for procurement planning)

Size	Length (mm)	Weight/Pc (kg)	Weight/100 pcs (kg)
M10×40	0.045	4.5
M12×50	0.075	7.5
M16×60	0.145	14.5
M20×80	0.295	29.5
M24×100	0.520	52
M30×120	0.980	98

Weights aligned with SM Fasteners production datasets used for export packing calculations.

16. Engineering Selection Matrix

Requirement	Recommended Variant
Severe abrasion	Hardened head plow bolt
High tensile load	Class 10.9 / ASTM A449
Corrosive environment	Stainless / Duplex
Offshore	Super Duplex / Nickel alloys
Chemical exposure	Hastelloy / SMO 254
Electrical insulation	PEEK plow bolts

17. Integration with Global Procurement Practice

SM Fasteners supports:

• EPC-approved drawings
• Dimensional approval samples
• First article inspection
• Controlled revision documentation
• Lot traceability systems

Ensuring compatibility with international procurement and QA/QC workflows.

18. Material Grades & Engineering Selection Criteria

Material selection for plow bolts is governed by four primary engineering drivers:

1. Mechanical strength requirement
2. Abrasion and impact resistance
3. Environmental corrosion exposure
4. Operating temperature range

Because plow bolts operate in high-wear industrial environments, improper material selection is the most common root cause of premature fastener failure.

SM Fasteners manufactures plow bolts across the full industrial metallurgy spectrum to support global EPC and OEM requirements.

18.1 Carbon Steel Grades

Carbon steel remains the most widely specified material for earthmoving and construction applications.

Standard	Grade	Typical Use
ASTM A307	Grade A	General equipment
ASTM A325	Structural	Heavy assemblies
ISO 898	Class 8.8	Industrial machinery
ISO 898	Class 10.9	High load joints

Advantages

• High tensile strength
• Cost efficiency
• Excellent machinability

Limitations

• Requires coating for corrosion protection

18.2 Alloy Steel Grades

Used where high preload retention and fatigue resistance are critical.

Common grades supplied by SM Fasteners:

• ASTM A193 B7
• 4140 / 4340 Alloy Steel
• ISO Property Class 10.9 & 12.9

Applications:

• Mining equipment
• Crusher liners
• Heavy structural machinery

18.3 Stainless Steel Fasteners

For corrosion-critical installations.

Grade	Standard	Characteristics
A2-70	ISO 3506	General corrosion resistance
A4-80	ISO 3506	Marine environment
316L	ASTM A193 B8M	Chloride resistance

Advantages:

• Corrosion resistance
• Reduced maintenance
• Clean service compatibility

18.4 Duplex & Super Duplex Stainless Steel

Required for aggressive environments:

• Offshore platforms
• LNG terminals
• Chemical processing plants

Common grades:

• Duplex 2205
• Super Duplex 2507
• SMO 254

Benefits:

• High yield strength
• Chloride SCC resistance
• Long service life

18.5 Nickel Alloy Fasteners

SM Fasteners supports extreme service environments using advanced alloys:

Alloy	Service Capability
Inconel 625	High temperature oxidation
Incoloy 825	Acid environments
Hastelloy C276	Chemical resistance
Monel 400	Seawater exposure
Nickel 200	Caustic processing

18.6 PEEK Plow Bolts (Advanced Polymer Fasteners)

SM Fasteners manufactures PEEK (Polyether Ether Ketone) plow bolts for specialized applications.

Applications include:

• Electrical insulation assemblies
• Chemical reactors
• Semiconductor equipment
• Non-metallic conveyor systems

Properties:

• Continuous service temperature ≈ 260°C
• Chemical inertness
• Lightweight
• Non-magnetic

19. Material Comparison Table

Material	UTS (MPa)	Yield (MPa)	Corrosion Resistance	Temp Limit	Relative Cost	Typical Application
Carbon Steel 8.8	800	640	Low	300°C	Low	Construction
Alloy Steel 10.9	1040	940	Low	400°C	Medium	Mining
Stainless 304	700	450	Good	400°C	Medium	General industry
Stainless 316	800	600	Very Good	450°C	Medium	Marine
Duplex 2205	850	620	Excellent	300°C	High	Offshore
Super Duplex	950	750	Outstanding	300°C	High	LNG
Inconel 625	1000+	700	Exceptional	700°C	Very High	Power/LNG
PEEK	100	95	Excellent	260°C	High	Electrical/Chemical

20. Corrosion Resistance vs Environment

Environment	Carbon Steel	Stainless 304	316	Duplex	Nickel Alloy	PEEK
Atmosphere	Fair	Good	Excellent	Excellent	Excellent	Excellent
Seawater	Poor	Moderate	Good	Excellent	Excellent	Excellent
Acidic Media	Poor	Fair	Good	Excellent	Outstanding	Excellent
H₂S / Sour Service	Poor	Limited	Moderate	Excellent	Excellent	Excellent
Chemical Processing	Poor	Good	Excellent	Excellent	Outstanding	Excellent
Offshore Splash Zone	Poor	Moderate	Good	Excellent	Excellent	Excellent

Materials meeting NACE MR0175 / ISO 15156 requirements are available for sour service.

21. Mechanical Properties — Grade Wise

Property Class	Proof Load (MPa)	Tensile Strength (MPa)	Hardness (HRC)
4.6	225	400	12–22
8.8	600	800	22–32
10.9	830	1040	32–39
12.9	970	1220	39–44

Hardness control is critical to prevent hydrogen embrittlement.

22. Heat Treatment Processes

Heat treatment determines final mechanical performance.

SM Fasteners performs controlled processes under ISO 9001 procedures.

22.1 Normalizing

Purpose:

• Grain refinement
• Uniform microstructure

Used for medium carbon steels.

22.2 Quenching & Tempering

Primary treatment for high-strength plow bolts.

Process:

1. Austenitizing
2. Rapid quench
3. Controlled tempering

Results:

• High tensile strength
• Improved fatigue resistance
• Controlled hardness

22.3 Induction Head Hardening

Common for plow bolts exposed to abrasion.

Benefits:

• Hard wear-resistant head
• Tough ductile shank

Prevents brittle fracture.

22.4 Solution Annealing (Stainless/Duplex)

Ensures:

• Corrosion resistance
• Phase stability
• Removal of residual stress

22.5 Hydrogen Embrittlement Relief Baking

Mandatory for plated high-strength bolts.

Typical procedure:

• 190–220°C baking
• Within 4 hours after plating

23. End-to-End Manufacturing Workflow

SM Fasteners operates a controlled manufacturing sequence ensuring traceability and repeatability.

23.1 Raw Material Verification

Incoming material checks include:

• Mill Test Certificate verification (EN 10204 3.1)
• Chemical composition validation
• Positive Material Identification (PMI)
• Ultrasonic inspection (where required)

23.2 Forging Operations

Preferred process for plow bolts.

Advantages:

• Directional grain flow
• Higher fatigue strength
• Reduced machining waste

Steps:

1. Bar cutting
2. Heating
3. Hot forging of head
4. Square neck formation

23.3 Precision Machining

Applied for:

• Custom geometries
• Tight tolerances
• Specialty alloys

CNC machining ensures dimensional accuracy.

23.4 Thread Formation

Thread Rolling (Preferred)

• Cold work hardening
• Improved fatigue resistance
• Smooth surface finish

Thread Cutting

Used for:

• Large diameters
• Exotic alloys
• Low production quantities

23.5 Heat Treatment Execution

Controlled furnaces with:

• Temperature logging
• Batch traceability
• Hardness validation

23.6 Surface Preparation

Before coating:

• Shot blasting
• Pickling
• Degreasing
• Surface activation

Ensures coating adhesion.

24. Surface Finishing & Coating Technologies

Surface engineering extends service life and stabilizes torque values.

24.1 Surface Finish Comparison Table

Coating	Corrosion Resistance	Torque Stability	Temp Limit	Typical Use
Black Oxide	Low	Good	300°C	Indoor equipment
Zinc Plated	Moderate	Good	120°C	Construction
Hot Dip Galvanized	High	Variable	200°C	Outdoor structures
Mechanical Galvanized	High	Good	200°C	Structural
Phosphate & Oil	Moderate	Excellent	300°C	Mining
Dacromet / Geomet	Very High	Excellent	300°C	Automotive/OEM
PTFE Coated	Excellent	Outstanding	260°C	Chemical
Nickel Plating	High	Stable	400°C	Marine
PEEK Coating	Exceptional	Stable	260°C	Chemical plants

24.2 Coating Engineering Considerations

Critical factors:

• Coating thickness vs thread tolerance
• Friction coefficient control
• Galvanic compatibility
• Hydrogen embrittlement prevention

SM Fasteners maintains coating qualification records within ISO 9001 documentation systems.

24.3 Lubrication Control

Lubrication stabilizes preload accuracy.

Typical lubricants:

• Wax-based coatings
• Molybdenum disulfide
• PTFE dry film
• Graphite lubricants

25. Manufacturing Traceability System

Each SM Fasteners plow bolt batch maintains:

• Heat number traceability
• Manufacturing route records
• Heat treatment batch ID
• Inspection status identification

Ensuring audit readiness for:

• EPC projects
• Oil & Gas operators
• Third-party inspection agencies

25.1 Integrated Quality Management

Processes aligned with:

• ISO 9001 Quality Management
• UKAF certification requirements
• Controlled document revision
• Calibration traceability

26. Inspection & Quality Control Philosophy

Plow bolts are classified as safety-critical industrial fasteners in heavy equipment, mining, structural, and energy infrastructure. Failure may result in:

• Equipment shutdown
• Structural damage
• Safety hazards
• Production losses

SM Fasteners integrates inspection at every manufacturing stage, ensuring conformity to international standards and EPC procurement specifications.

27. Incoming Material Inspection

Verification Activities

Inspection	Method	Objective
Material Certification	EN 10204 3.1 MTC	Chemical compliance
Positive Material Identification	PMI (XRF/OES)	Alloy confirmation
Visual Inspection	Surface check	Defect detection
Ultrasonic Testing	UT	Internal flaw detection
Hardness Check	Rockwell/Brinell	Baseline properties

All raw material heats remain traceable through production.

28. In-Process Dimensional Inspection

Critical parameters monitored:

• Head diameter
• Countersink angle
• Square neck dimension
• Thread pitch accuracy
• Concentricity
• Length tolerance

Inspection equipment includes:

• Digital micrometers
• Optical profile projectors
• Thread plug & ring gauges
• Go/No-Go gauges calibrated under ISO systems

29. Mechanical Testing

Performed according to ISO, ASTM, and customer specifications.

Test	Standard	Purpose
Tensile Test	ISO 898-1	Strength verification
Proof Load Test	ASTM F606	Elastic limit confirmation
Hardness Test	ISO 6508	Heat treatment validation
Impact Test	ASTM E23	Toughness evaluation
Wedge Tensile Test	ISO 898	Head integrity

30. Non-Destructive Testing (NDT)

Required for critical EPC and Oil & Gas projects.

Method	Application
Magnetic Particle Inspection (MPI)	Surface crack detection
Dye Penetrant Testing (DPT)	Stainless alloys
Ultrasonic Testing (UT)	Internal defects
Eddy Current Testing	Surface integrity

31. Coating & Surface Verification

Quality checks include:

• Coating thickness measurement
• Adhesion testing
• Salt spray corrosion testing
• Friction coefficient validation

Typical salt spray benchmarks:

Coating	Corrosion Resistance
Zinc Plating	72–120 hrs
HDG	500+ hrs
Geomet/Dacromet	1000+ hrs
PTFE Systems	Chemical resistant

32. Final Inspection & Traceability

Each shipment undergoes final verification:

• Lot identification marking
• Visual inspection
• Packaging verification
• Documentation review

Traceability includes:

• Heat number
• Batch number
• Manufacturing route
• Inspection records

Integrated under ISO 9001 quality management.

33. Failure Mechanisms & Prevention

33.1 Fatigue Failure

Caused by fluctuating loads.

Mitigation:

• Controlled preload
• Rolled threads
• Smooth head seating

33.2 Shear Failure

Occurs when frictional clamp force is insufficient.

Prevention:

• Correct torque
• Adequate grip length

33.3 Hydrogen Embrittlement

Risk for high-strength plated bolts (>10.9).

SM Fasteners control measures:

• Low hydrogen plating chemistry
• Mandatory baking cycle

33.4 Stress Corrosion Cracking

Critical in chloride or H₂S environments.

Solution:

• Duplex stainless
• Nickel alloys
• NACE MR0175 compliance

34. Industrial Application Mapping

Construction & Structural Steel

• Bridge wear plates
• Heavy steel assemblies
• Earthmoving attachments

Requirements:

• High clamp force
• Galvanized protection

Oil & Gas Industry

Upstream

• Rig floor plates
• Drilling equipment liners

Midstream

• Conveyor systems
• Pipe handling equipment

Downstream

• Refinery material handling systems

Materials supplied:

• A193 B7
• Duplex
• Inconel
• SMO 254

Power Generation

• Coal handling plants
• Ash conveyors
• Turbine service platforms

High-temperature alloys available.

Petrochemical & Chemical Processing

Requires:

• Chemical resistance
• Anti-galling performance
• Controlled friction coatings

LNG & Offshore Installations

Challenges:

• Chloride exposure
• Salt spray
• Thermal cycling

Recommended materials:

• Super Duplex
• Nickel alloys
• PTFE-coated fasteners

Automotive & Heavy Equipment

• Dozer blades
• Excavator buckets
• Agricultural plows

Primary global usage sector for plow bolts.

Railways & Infrastructure

• Track wear components
• Maintenance equipment
• Snow removal systems

Shipbuilding & Marine Engineering

• Deck equipment
• Bulk handling systems
• Abrasion-prone structures

PEEK Plow Bolt Applications

• Electrical insulation panels
• Chemical reactors
• Semiconductor handling equipment
• Corrosion-free assemblies

35. Export Capability & Global Supply Readiness

SM Fasteners supplies plow bolts worldwide supporting EPC contractors and OEM manufacturers.

35.1 Industrial Packaging

Method	Purpose
VCI Packaging	Corrosion prevention
Thread Protectors	Damage prevention
Oil Wrapping	Marine transport
Heat Sealed Bags	Stainless alloys

35.2 Export Crating

• ISPM-15 compliant wooden crates
• Palletized loads
• Moisture barrier systems
• Container loading plans

35.3 Documentation Package

Provided per shipment:

• Mill Test Certificates (EN 10204 3.1 / 3.2)
• Heat Treatment Reports
• Coating Certificates
• Dimensional Inspection Reports
• NDT Reports
• Certificate of Conformity
• Packing List & Traceability Sheet

Fully aligned with international project procurement requirements.

MANDATORY ENGINEERING TABLES

36. Proof Load & Tensile Strength Table

Size	Property Class	Proof Load (kN)	Tensile Strength (kN)
M12	8.8	45	60
M16	8.8	83	104
M20	10.9	145	181
M24	10.9	210	262
M30	10.9	350	438

37. Tightening Torque Chart

(Approximate Engineering Values)

Size	Grade	Dry Torque (Nm)	Lubricated Torque (Nm)
M12	8.8	85	65
M16	8.8	210	160
M20	10.9	420	320
M24	10.9	720	540
M30	10.9	1450	1080

38. Preload Calculation — Worked Example

Given

• Bolt: M20 Class 10.9
• Torque = 420 Nm
• Nut Factor = 0.20

$$F = \frac{T}{K \times d}$$

$$F = \frac{420}{0.20 \times 0.020}$$

$$F = 105,000 \, N \approx 105 \, kN$$

Recommended preload ≈ 70% proof load → Safe elastic operation.

39. Thread Standards & Tolerance Table

Thread Type	Standard	Tolerance
Metric Coarse	ISO 261	6g/6H
Metric Fine	ISO 965	6g/6H
UNC	ASME B1.1	2A/2B
UNF	ASME B1.1	2A/2B
BSW	BS 84	Medium fit
BSF	BS 84	Fine fit

40. Surface Finish Performance Comparison

Finish	Corrosion Protection	Torque Consistency	Maintenance Need
Black Oxide	Low	High	High
Zinc	Moderate	Good	Medium
HDG	High	Variable	Low
Geomet	Very High	Excellent	Low
PTFE	Excellent	Outstanding	Minimal
Nickel	High	Stable	Low

41. Weight Chart — SM Fasteners Reference

Size	Length	Weight/Piece (kg)	Weight/100 pcs (kg)
M12×50	0.075	7.5
M16×60	0.145	14.5
M20×80	0.295	29.5
M24×100	0.520	52
M30×120	0.980	98

Used for logistics planning and container optimization.

42. Engineering Selection Workflow

Step 1 — Define Load

• Tensile
• Shear
• Impact

Step 2 — Environment

• Marine
• Chemical
• High temperature
• Sour service

Step 3 — Material Selection
Using material comparison tables.

Step 4 — Surface Engineering
Based on corrosion exposure.

Step 5 — Certification Level

• Standard industrial
• EPC project
• Third-party inspected

43. SM FASTENERS — ENGINEERING & GLOBAL SUPPLY POSITION

SM Fasteners demonstrates capability through:

• ISO 9001 certified manufacturing systems
• UKAF accredited quality procedures
• MSME registered industrial manufacturing base
• Advanced metallurgy capability including PEEK and Nickel alloys
• Full dimensional and mechanical inspection systems
• Custom fastener engineering and drawing development
• Export-ready packaging and documentation compliance

The organization supports global EPC contractors, OEM manufacturers, and industrial asset owners requiring technically compliant plow bolt solutions with verified quality assurance and reliable supply continuity.