Mechanical Joint T-Head Bolts (ANSI/AWWA C111) — Per-Pipe-Size Chart
Mechanical joint T-head bolts for ductile-iron waterworks, aligned with ANSI/AWWA C111/A21.11 — the collected per-pipe-size chart: bolt size, length, quantity per joint and assembly torque for 3 – 48 in pipe.
Last updated: 2026-11
Specifications
Mechanical joints are the bolted, gasketed connection that joins ductile-iron pipe and fittings in waterworks systems, and the T-head bolt is the fastener the gland uses: its square-plate head bears against the gland slot without rotating, so one wrench does the tightening from the nut side. The collected chart, which the source aligns with ANSI/AWWA C111/A21.11, is the field selection table: for each nominal pipe size from 3 to 48 in it prints how many T-head bolts the joint takes, the bolt diameter, the bolt length and the torque range for assembly. Reading it is direct — a 12 in joint takes eight 3/4 in bolts, 4 in long, torqued to 75–90 ft-lb; sizes step up at 3 in (four 5/8 in bolts at 45–60 ft-lb) and again past 24 in, reaching eight-to-thirty-two bolts of 1 in and 1 1/4 in diameter at 100–150 ft-lb on the largest pipe. The torque ranges are the gland-compression window the chart prints; even bolt pattern around the joint and sequential tightening are installation practice, not tabulated here. Bolt material and coating (typically galvanizing or polywrap in buried service) are not tabulated by the collected chart — per RFQ.
| Standard alignment | ANSI/AWWA C111/A21.11-00 (source statement kept) — mechanical joint T-head bolts for ductile-iron pressure pipe and fittings |
|---|---|
| Pipe size range | Nominal 3 – 48 in, fifteen pipe-size rows (3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 24, 30, 36, 42, 48) |
| Tabulated values | Per pipe size: bolt quantity per joint (4 – 32), bolt size (5/8, 3/4, 1, 1 1/4 in), bolt length (3 – 6 1/2 in), assembly torque (45–60, 75–90, 100–120, 120–150 ft-lb) |
| Units | Size and length in inches; torque in foot-pounds (source unit note kept) |
| Material / coating | Not tabulated by the collected chart — per RFQ (state coating system and bury/exposure conditions at quotation) |
| Nominal Recommended Pipe Size | Quantity | Size (in) | Length (in) | Torque (ft-lb) |
|---|---|---|---|---|
| 3 | 4 | 5/8 | 3 | 45-60 |
| 4 | 4 | 3/4 | 3 1/2 | 75-90 |
| 6 | 6 | 3/4 | 3 1/2 | 75-90 |
| 8 | 8 | 3/4 | 4 | 75-90 |
| 10 | 8 | 3/4 | 4 | 75-90 |
| 12 | 8 | 3/4 | 4 | 75-90 |
| 14 | 10 | 3/4 | 4 1/2 | 75-90 |
| 16 | 12 | 3/4 | 4 1/2 | 75-90 |
| 18 | 12 | 3/4 | 4 1/2 | 75-90 |
| 20 | 14 | 3/4 | 4 1/2 | 75-90 |
| 24 | 16 | 3/4 | 5 | 75-90 |
| 30 | 20 | 1 | 6 | 100-120 |
| 36 | 24 | 1 | 6 | 100-120 |
| 42 | 28 | 1 1/4 | 6 1/2 | 120-150 |
| 48 | 32 | 1 1/4 | 6 1/2 | 120-150 |
Materials
- Bolt material and coating specified per RFQ — waterworks mechanical joints commonly order galvanized or wrapped bolts; state the service environment at quotation
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (Mechanical Joint T-Head Bolts (ANSI/AWWA C111) — Per-Pipe-Size Chart) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 1,000–10,000 pieces depending on size. Stock items run 3–7 days. High-strength and custom parts run 15–25 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
How do I pick the T-head bolt for a mechanical joint, and does the chart replace the torque spec?
The chart is keyed by pipe size, and that is how the joint is actually ordered in the field: find the nominal pipe size, and the row gives everything else — bolt count, diameter, length and torque range. Two reading rules keep it honest. First, the length column already includes the gland, gasket pack and nut stack for the standard mechanical joint on that pipe size, so do not re-derive length from gland drawings unless your joint hardware is non-standard — order by the row and verify against the gland on site. Second, the torque column is a range, not a single value (45–60, 75–90, 100–120, 120–150 ft-lb by size group), and the ranges step at the same pipe sizes the bolt diameter steps, so a torque wrench set mid-range is the practical assembly target; the ranges in this collected chart come from the AWWA-aligned source, and any project specification that prints its own torque values governs. What the chart deliberately does not answer is material and coating: buried waterworks joints usually call for galvanized or wrapped bolts, and that is an RFQ line, not a table column — state pipe size, coating system and quantity and the bolts follow the row.
What is the MOQ and lead time for this bolt type?
The minimum order quantity is 1,000–10,000 pieces depending on size. Stock items ship in 3–7 days; high-strength and custom parts in 15–25 days. Common sizes in this bolt type are widely stocked; confirm the exact schedule against quantity and size mix at quotation.
Related knowledge
- What Bolt Property Classes 8.8, 10.9 and 12.9 Encode — and When High Strength Stops Being the Right Choice
- Bolt Grade Selection: ISO 898-1 8.8/10.9/12.9 vs ASTM A307 and A325
- 8.8 vs 10.9 vs 12.9 Bolts: Strength, Hardness and Cost — What the Evidence Settles
- Calculating Bolt Preload and Clamp Force: Torque, Friction and Tightening Method
- How to Determine Tightening Torque and Choose a Tightening Method for a Bolted Joint
- Fastener Failure Modes: Which Fatigue, Creep and SCC Controls the Evidence Supports
- Hydrogen Embrittlement in High-Strength Bolts: Which Grades Need Controls, Which Coatings and Baking Schedules Are Acceptable, and What to Require Before the RFQ
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support