SAE J429 Grade 8 Bolts Aspects
Mortec At A Glance
Established
Since 2012 • 14+ yrs experience
Manufacturing Units
2 in-house units • Taloja & Mazgaon
Stockyard Area
8,850+ sq.ft • Ready-stock inventory
Certifications
ISO 9001:2015 • GST, IEC & MSME
Clientele
100+ clients • India & export markets
Export Reach
15+ countries • GCC, Africa & Americas
Testing Offered
Proof load, hardness & PMI • MTC EN 10204 3.1 & 3.2
Shipment Documents
Invoice, Packing List • COO, COI, MTC & BL
Table of Content
Strict QA Approved SAE Grade 8 Studs And Screw Manufacturer in India, Refer Torque Chart
When joints face shock, vibration or sustained loads, under-grading becomes costly. Fabricators across South Africa, UAE, Canada and GCC choose SAE J429 Grade 8 Bolts. Our Grade 8 bolts, studs and screws receive heat treatment. Each bolt is quenched, tempered and proof-load tested before dispatch. Ex-stock sizes from 1/4" through 1-1/2" ship within 24-48 hours. This helps breakdown orders avoid costly and unexpected production shutdowns.
Every Grade 8 batch achieves Rockwell C33-C39 core hardness requirements. We chemically check each batch against SAE J429 requirements. Every shipment includes EN 10204 3.1 documentation for complete traceability. Third-party witnessed 3.2 testing is also available upon request. As direct manufacturers, we confirm bolt specifications before your purchase order. Our grade desk verifies threads, head styles and finishes beforehand.
SAE J429 Grade 8 Bolts Specification
Request a direct manufacturer quote with original MTCs. Ex-stock Grade 8 sizes available from our Mumbai unit.
Grade 8 Bolt Head Styles & Drive
- Hex, Heavy Hex, Square heads
- Socket cap & sems on request
SAE J429 Gr 8 Screw Governing Dimensional Standards
- ASME B18.2.1 (Hex Bolts)
- ASME B18.2.6, ASME B18.3
J429 Grade 8 Studs Recommended Nut & Washer
- SAE J995 Grade 8 hex nut
- F436 hardened flat washer
SAE J429 Grade 8 Bolts Testing Methods Offered
- Proof load & core hardness
- PMI verification on request
Zinc Plated Grade 8 Sems Packaging & Export Pack
- Poly bins, export cartons
- Silica-gel moisture protection
Gr 8 Machine Screws Compliance For Buyer Geography
- RoHS & REACH SVHC statement
- Certificate of Origin for GCC/Africa customs
Medium Carbon Steel Grade 8 Bolts Manufacturing Standards
Every Grade 8 Bolt we head and thread is checked against these governing codes before dispatch.
Torque Chart of SAE J429 Grade 8 Hex Bolts
Suggested UNC torque values: K = 0.20 (plain), K = 0.10 (lubricated). Confirm torque for actual joint conditions.
| Bolt Size | TPI | Proof Load (lb) | Clamp Load (lb) | Torque Plain | Torque Lubricated |
|---|---|---|---|---|---|
| 1/4 | 20 | 3,800 | 2,850 | 12 | 6 |
| 5/16 | 18 | 6,300 | 4,725 | 25 | 12 |
| 3/8 | 16 | 9,300 | 6,975 | 44 | 22 |
| 7/16 | 14 | 12,750 | 9,563 | 70 | 35 |
| 1/2 | 13 | 17,050 | 12,788 | 107 | 53 |
| 9/16 | 12 | 21,850 | 16,388 | 154 | 77 |
| 5/8 | 11 | 27,100 | 20,325 | 212 | 106 |
| 3/4 | 10 | 40,100 | 30,075 | 376 | 188 |
| 7/8 | 9 | 55,450 | 41,588 | 606 | 303 |
| 1 | 8 | 72,700 | 54,525 | 909 | 454 |
| 1-1/8 | 7 | 91,550 | 68,663 | 1,287 | 644 |
| 1-1/4 | 7 | 120,000 | 90,000 | 1,875 | 938 |
| 1-3/8 | 6 | 138,600 | 103,950 | 2,382 | 1,191 |
| 1-1/2 | 6 | 168,600 | 126,450 | 3,161 | 1,581 |
SAE J429 Grade 8 Bolts Manufacturer In India Since 2012
Send size, thread and quantity – our plant confirms ex-stock and mill-order lead times within hours.
Common Types of SAE Grade 8 Bolts
Trusted SAE J429 Grade 8 Bolts Supplier in India, with ex-stock availability in popular sizes and head styles.
SAE J429 Grade 8 Hex Bolt
ASME B18.2.1 • 1/4″–1-1/2″- Six-flat head for fast wrenching
- Most-ordered Grade 8 form
J429 Grade 8 Studs
Double-End • Custom Length- Threaded full length or partial
- Used with two Grade 8 nuts
SAE J429 Gr 8 Heavy Hex Bolt
ASME B18.2.6- Larger bearing surface, deeper head
- Preferred for structural joints
Gr 8 Machine Screws
ASME B18.3- Internal drive for flush fitment
- Common in machine assemblies
Zinc Plated Grade 8 Sems
Captive Washer- Washer pre-assembled to shank
- Cuts assembly-line handling time
Medium Carbon Steel Grade 8 U-Bolt
Round Bend • Custom Gap- Clamps pipe, axle & leaf-spring loads
- Supplied with matching nuts
Buy Industry-Tested Medium Carbon Steel Gr 8 Sems And Hex Bolts At Wholesale Rates, See Yield Strength
Mechanical Properties of Medium Carbon Steel Grade 8 Bolts
SAE J429 Gr 8 Fasteners Chemical Composition
Equivalent of Zinc Plated Grade 8 Sems
ASTM / SAE (USA)
- SAE J429 Grade 8
- ASTM A354 Grade BD (over 1-1/2″)
- Nut: SAE J995 Grade 8
ISO / Metric (Europe)
- ISO 898-1 Property Class 10.9
- Comparable tensile tier, not dimensionally interchangeable
Southern Africa
- SANS 1700 fastener series (dimensional cross-check)
- Specified alongside SAE J429 on import orders
GCC / Middle East
- Specified directly as SAE J429 Grade 8
- Class 10.9 accepted as an alternate on EPC BOQs
Your SAE J429 Grade 8 Bolts Partner Across GCC, Africa & Europe
Ex-stock inventory and mill-order dispatch to buyers across these regions.
Dubai, UAE
Dammam, KSA
Istanbul, Turkey
Kampala, UgandaDurban, S. Africa
United Kingdom
Italy
Germany
NetherlandsDimensions of SAE J429 Gr 8 Heavy Hex Bolt
Hex head dimensions per ASME B18.2.1 – body diameter and width across flats govern the socket or wrench size needed on site.
| Nominal Size | Body Dia. Max | Body Dia. Min | Width Across Flats |
|---|---|---|---|
| 1/4 | 0.260 | 0.237 | 7/16 |
| 5/16 | 0.324 | 0.298 | 1/2 |
| 3/8 | 0.388 | 0.360 | 9/16 |
| 7/16 | 0.452 | 0.421 | 5/8 |
| 1/2 | 0.515 | 0.482 | 3/4 |
| 5/8 | 0.642 | 0.605 | 15/16 |
| 3/4 | 0.768 | 0.729 | 1-1/8 |
| 7/8 | 0.895 | 0.852 | 1-5/16 |
| 1 | 1.022 | 0.976 | 1-1/2 |
| 1-1/8 | 1.149 | 1.098 | 1-11/16 |
| 1-1/4 | 1.277 | 1.223 | 1-7/8 |
| 1-3/8 | 1.404 | 1.345 | 2-1/16 |
| 1-1/2 | 1.531 | 1.470 | 2-1/4 |
Quenched & Tempered SAE J429 Grade 8 Bolts Exporter To Durban & Jebel Ali
Tell us port, quantity and finish – we quote container-ready pricing within hours.
J429 Grade 8 Studs Head Markings & Identification
Import buyers checking a shipment against a grade certificate can confirm the head marking against these points.
Six Radial Lines
Grade 8 heads carry six raised radial lines, the standard SAE identification mark.
Manufacturer's Mark
A registered symbol or trademark should sit alongside the grade lines on the head.
Heat Number Trace
Cross-check the batch heat number on the MTC against the packing list.
Hardness Spot-Check
A Rockwell C33–C39 reading on receipt confirms the batch matches spec.
Surface Coatings of SAE J429 Gr 8 Screw
Choose a finish based on environment, budget and the coating caution above.
SAE Grade 5 Vs Grade 8 Bolts
Both are quenched-and-tempered inch-series bolts – the difference is alloying content and rated strength.
SAE Grade 5
- Material: Medium carbon steel
- Tensile (1/4″–1″): 120,000 psi min
- Yield: 92,000 psi min
- Hardness: Rockwell C25–C34
- Marking: Three radial lines
SAE Grade 8
- Material: Medium carbon alloy steel
- Tensile (1/4″–1-1/2″): 150,000 psi min
- Yield: 130,000 psi min
- Hardness: Rockwell C33–C39
- Marking: Six radial lines
SAE J429 Gr 8 Fasteners Applications
SAE J429 Grade 8 Bolts Manufacturer in Mumbai supplies high-strength bolts for demanding applications.
SAE J429 Grade 8 Bolts Supplier In India, MTC Backed
Domestic buyers get the same proof-load tested stock, dispatched same week from Mumbai.
Manufacturing Process of Grade 8 Bolt
Every Grade 8 Bolt passes through these stages from wire rod to a marked, tested piece.
Cold Heading
Wire rod formed to head and shank under high-pressure dies.
Thread Rolling
UNC/UNF threads rolled, not cut, for higher fatigue strength.
Quench & Temper
Heat treated to Rockwell C33–C39 core hardness per SAE J429.
Test & Mark
Proof load, hardness and PMI check before six-line head marking.
J429 Grade 8 Studs Shipping Time
Grade 8 Studs ship from Mumbai after payment confirmation, transit varies by destination.
Ex-Stock Dispatch
Ready Grade 8 sizes leave our unit in 24–48 hours
Sea Freight
Most economical route, 10–30 days to your discharge port
Air Freight
3–6 days by air for breakdown or shutdown orders
Country-Specific ETA
Send your destination port for a firm delivery date
SAE J429 Grade 8 Bolts - Ex-Stock, Global Shipping
Container-ready shipments for buyers across North America and Southeast Asia.
Singapore
Thailand
Philippines
Malaysia
Indonesia
VietnamZinc Plated Grade 8 Sems Price Factors
Four variables move the per-piece price most – share yours for an accurate quote.
Gr 8 Machine Screws Testing & Certification
Each of these checks is available on request and recorded on your mill test certificate.
SAE J429 Grade 8 Bolts FAQs
Quick answers to the questions buyers ask us most before placing an order.
What is the SAE J429 Gr 8 Screw equivalent standard?
Above 1 1/2", use ASTM A354 Grade BD; metric equivalent: ISO 898-1 Class 10.9.
What are the SAE J429 Grade 8 Hex Bolts dimensions?
Grade 8 hex bolts follow ASME B18.2.1 dimensions from ¼" to 1½". See our chart for exact sizes.
What are the mechanical properties of J429 Grade 8 Studs?
Grade 8: ≥130 ksi yield, ≥150 ksi tensile, ≥12% elongation, and HRC 33-39 hardness.
Can Zinc Plated Grade 8 Sems be hot-dip galvanized?
Not recommended, Grade 8's ≥33 HRC hardness increases hydrogen embrittlement risk during hot-dip galvanizing.
Do you export SAE J429 Gr 8 Fasteners to South Africa, the UAE and Canada?
Yes, ex-stock and mill-order Grade 8 fasteners supplied worldwide with complete export documentation.
Authorized Supplier For The Following Companies - Material At Reseller Price For Traders
