OEM · Manufactured in Ahmedabad
Sag Rods Manufacturer - PEB Purlin & Solar Bracing
Threaded sag rods for pre-engineered-building roof and wall purlin bracing, cold-formed steel framing and solar module racking cross-bracing - cut-to-length, HDG or zinc, hex nuts and optional turnbuckles supplied with the lot. Made at our Ghanshyam Industrial Estate plant and dispatched India-wide against the project schedule or structural drawing.
What a sag rod does - and where KP fits
A sag rod is a secondary tension member that keeps a light-gauge roof or wall purlin from twisting under one-sided sheeting load and from sagging over its own self-weight before the roof sheet is fixed. The name refers to the deflection the rod prevents. In a pre-engineered building the sag-rod line passes through each purlin web and is anchored at a rafter at each end of the bay; one, two or three lines per bay is a function of span and sheeting.
Sag rods are distinct from flange-clamp stud bolts and from cast-in foundation anchor bolts. They are also distinct from compression tie-rod assemblies - a sag rod carries tension only, with hex nuts at each end.
KP Fasteners manufactures sag rods in-house as part of our threaded-rod production line: base round-bar stock in mild steel (IS 2062) and high-tensile carbon-steel grades is cut to the drawing length, the thread run at each end is rolled or cut to 6g tolerance per IS 1367, and the lot is coated to the specified class - most commonly hot-dip galvanised for outdoor service.
Our plant is at Ghanshyam Industrial Estate, Ahmedabad. We supply PEB fabricators, cold-formed-steel builders, solar EPC contractors and structural steel detailers across India, with dispatch by road and rail from Ahmedabad.
Standards we manufacture against
Sag rods are a field-fabricated assembly - adherence is base-metal-driven rather than driven by a dedicated sag-rod product standard. The rows below map the standards that govern the base steel, the thread form and the coating class we supply against. Every row is referenced to a published standard (BIS, ISO or ASTM).
| Standard | Country | Equivalent / scope | Grades / classes | Typical application |
|---|---|---|---|---|
| IS 2062 | India (BIS) | Hot-rolled structural steel - base round-bar stock | E250 (Gr A / B / C), E350 | MS sag-rod base stock for PEB and structural bracing |
| ASTM A36 / A36M | USA (ASTM) | Carbon-structural-steel base stock | A36 | Base round-bar equivalent on ASTM-referenced projects |
| IS 1367 (Part 3) | India (BIS) | Property classes & threading for carbon-steel fasteners | Property class 4.6, 4.8, 8.8 | Thread form (6g) and mechanical property-class marking |
| ISO 898-1 | International (ISO) | Mechanical properties of carbon- & alloy-steel fasteners | Property class 4.6 - 10.9 | Metric mechanical minima for high-tensile sag-rod stock |
| ASTM A307 | USA (ASTM) | Carbon-steel bolts & studs 60 ksi tensile | Grade A, Grade B | Companion mild bolts & nuts where ASTM is specified |
| ASTM A153 / A153M | USA (ASTM) | Zinc coating (hot-dip) on iron & steel hardware | Class B-1 / B-2 / B-3 / C / D | HDG film-thickness class on outdoor sag-rod lots |
| IS 2629 | India (BIS) | Hot-dip galvanising of iron & steel | Coating classes per thickness | IS-referenced HDG for PEB and solar sag-rod lots |
| ASTM B117 | USA (ASTM) | Salt-spray (fog) test for coating performance | Reference test method | Reported salt-spray hours on coated-sag-rod inspection |
Thread form per IS 1367 (Part 3) / ISO 965 at 6g tolerance. Base-metal property-class values per ISO 898-1. HDG film-thickness class per ASTM A153 / IS 2629.
Sag-rod sub-types we manufacture
Sub-type is specified by the structural designer against the bay geometry and the field-fit method. We supply the full sag-rod sub-type range plus companion threaded-rod stock for mixed-use orders.
Grade & mechanical reference
Mechanical minima below are from the published IS 1367 / ISO 898-1 property-class specifications applied to the sag-rod base stock. Actual lot values are reported on the EN 10204 3.1 mill test certificate on request. For a wider high-tensile property-class reference for bracing threaded rod see our materials page.
| Property class | Yield min (MPa) | Tensile min (MPa) | Elong. min (%) | Typical hardness HBW | Service / coating |
|---|---|---|---|---|---|
| 4.6 (MS) | 240 | 400 | 22 | ≤ 124 | General PEB / solar · HDG, Zinc, Plain |
| 4.8 (MS) | 320 | 400 | 14 | ≤ 124 | General PEB / solar · HDG, Zinc, Plain |
| 8.8 (high-tensile) | 640 | 800 | 12 | ≤ 319 | Heavy structural truss bracing · HDG |
Values per ISO 898-1 and IS 1367 (Part 3) property-class tables. Property class 8.8 is quoted against confirmed base-stock availability in the sag-rod diameter band.
Coatings & finishes offered
Coating is selected by the field environment and by whether the bracing line is permanent or temporary. HDG is the field default for outdoor PEB and solar lines; plain and oiled finishes are for temporary erection-stage bracing. Salt-spray performance is reported per ASTM B117 on request.
Hot-Dip Galvanised (HDG)
Zinc dip to ASTM A153 Class B / C or IS 2629 - the field default for outdoor PEB roof purlin bracing and for solar racking cross-bracing. Zinc film thickness is specified against the coating-class table on the RFQ. Nut threads are over-tapped per ASME B18.2.6 to accept HDG studs.
Zinc Electroplating
Trivalent passivated zinc for indoor and short-service applications - temporary site bracing, dry-indoor truss bracing. Lighter film than HDG; not a substitute for HDG on outdoor sag-rod lines.
Plain / Oiled
Self-colour mill-finish rod with a light preservative oil film. Specified for temporary bracing that comes down after erection, or where the sag-rod line will be site-painted into a wider structural coating scheme.
Black Oxide
Black-oxide conversion coating for a uniform dark finish on indoor temporary bracing. Short-term protection only; combine with oil film for storage runs.
Choosing the right sag rod for the service
A short decision block for procurement officers working from a PEB schedule, a solar racking BOM or a structural-steel bracing drawing. KP supplies against the engineer’s specification - we do not perform the bracing design itself.
PEB roof & wall purlin bracing
- Diameter: typical M12 - M20 per span table.
- Base: MS property class 4.6 / 4.8.
- Coating: HDG (ASTM A153 / IS 2629).
- Ends: threaded both ends with matching hex nuts.
Solar module racking cross-bracing
- Diameter: typical M12 - M16 per racking OEM detail.
- Base: MS property class 4.6 / 4.8.
- Coating: HDG (field default for outdoor).
- Optional centre turnbuckle for in-field tensioning.
Structural steel truss bracing
- Diameter: typical M16 - M24 per engineer’s callout.
- Base: property class 8.8 on confirmed stock.
- Coating: HDG or paint-ready plain finish.
- Companion washers (F436 if structural) on request.
Temporary site bracing
- Diameter: typical M12 - M16.
- Base: MS property class 4.6.
- Coating: plain / oiled or black-oxide.
- Short-service - removed after permanent bracing is in.
Applications & sectors we supply
Sectors we actively supply from Ahmedabad. For project-level support on solar module mounting and racking fasteners or structural steel and heavy civil projects, or for PEB & industrial shed purlin bracing, share the bracing schedule or BOQ and we quote per diameter, length and coating.
PEB roof purlin bracing
The classic case - one, two or three lines of sag rods per bay to split the Z- or C-purlin into shorter unbraced lengths, preventing lateral-torsional buckling before and after sheeting.
Cold-formed steel roof framing
Cross-bracing between cold-formed C-section rafters on light-industrial sheds, warehouse mezzanines and farm sheds, where a rod-and-nut assembly is lighter than an angle brace.
Solar module racking cross-bracing
Table-to-table diagonal and torsion-tube-to-post bracing on fixed-tilt and tracker structures. HDG is the default coating for the field environment.
Structural steel truss bracing
Secondary tension members on industrial-mezzanine, bridge-deck and heavy-structural truss assemblies where a threaded-rod brace is preferred over an angle member.
Temporary site bracing
Plain or oiled sag rods for erection-stage bracing that comes down once the primary structure is sheeted and the permanent bracing is in. Short-service, lower coating demand.
Sector participation is listed per published standards coverage and KP’s active supply lines; project-specific sector-reference naming is provided on quote.
Related product lines
Explore companion structural fasteners, purlin accessories, and bracing components:
Foundation Bolts
J, L, U, headed and swedge foundation bolts to IS 5624, DIN 529 and ASTM F1554 for the column-base anchor at each end of the roof-line bracing.
cast-in foundation bolts (IS 5624 / F1554)
Stud Bolts
Fully-threaded, tap-end and double-end stud bolts to ASTM A193 B7 / B8M and DIN 976 threaded rod - for the flange termination of a sag-rod line onto a bolted connection.
stud bolts for flange clamping
Scaffold Accessories
Companion scaffold hardware and site-work accessories - ships together with temporary-bracing sag-rod lots on erection-stage orders.
scaffold accessories and site-work hardwareBack to our full products range. See also our solar mounting fasteners and construction & infrastructure industry pages for the broader sag-rod application context.
Frequently asked questions
Procurement-level answers. For project-specific detail, send your bracing schedule or PEB drawing.
What size sag rod do I need for a PEB purlin bracing run?
Diameter is set by the structural designer against the purlin span, sheeting load and the number of sag-rod lines in the bay - a Z-purlin 6 m span is commonly specified at M16 with HDG coating, but exact selection must come from the project span table and the fabricator’s standard detail. KP supplies to the engineer’s callout; we do not perform the bracing design itself. Share the drawing or the schedule and we quote by diameter, length and coating.
Can I get sag rods pre-cut to length?
Yes - cut-to-length to drawing is the standard supply form. Specify the overall rod length and the thread length at each end on the RFQ (typical thread run is 75-150 mm per end). For long bays beyond stock length we supply with a mid-coupler; call it out on the schedule so we ship the matching coupler and nuts in the same lot.
What coating is recommended for solar racking sag rods?
Hot-dip galvanised (HDG) to ASTM A153 Class B / C or IS 2629 is the field default for outdoor exposure - solar racking cross-bracing and PEB roof purlin bracing both live outside and need the zinc film thickness. Zinc electroplate is only suitable for indoor or short-service lines. For coastal / high-humidity sites, confirm the coating class on the quote line.
Do you supply the matching hex nuts, washers and turnbuckles?
Yes - the sag-rod lot ships with matching hex nuts (two per rod, standard) and flat washers on request. Turnbuckles for adjustable mid-span tensioning are available as a companion item. Pairings and finishes are matched to the rod coating. See our hex bolts & nuts range for standalone nut and washer supply.
Is EN 10204 3.1 MTC available on sag-rod lots?
EN 10204 3.1 mill test certificates are available on request, with batch traceability by heat number on the base-steel round. Dimensional inspection and thread-gauge (6g go / no-go) checks are performed in-house on every lot. Confirm the MTC requirement on the quote line so the base-material heat number is reserved.