Product and assembly brief
This selector concerns a square external head formed continuously with a broad circular washer-like bearing disc and a machine-threaded shank. The integral disc is not a separate retained washer. It is distinct from the existing hex-flange, domed timber-fin and SEMS selectors; a catalogue name alone does not identify the complete ordered part.
Product forms and reference names
| Choice or field | What to identify |
|---|---|
| Square-head integral-washer form | Portland Bolt describes a square head and washer-like bearing surface made as one piece. Specify the square head, circular disc and their transitions from the selected controlled drawing; no maker dimensions are transferred here. |
| Separate washer assembly | A bolt with an independent loose or captive washer is not this one-piece construction. Identify the separate components and whether a retained washer can move; use the SEMS selector for that different assembly. |
| Hex-flange alternative | The existing hex-flange detail concerns a hexagonal head and defined flange face. Similar broad bearing appearance does not establish the same head, envelope or specification. |
| Selected end geometry | The maker describes a semi-cone end. Record the actual end profile and drawing; this is not a self-drilling tip or universal installation instruction. |
Square head and integral bearing disc
Specify head width across flats, height and corners separately from disc diameter, thickness, underside profile and head-to-shank transitions. The illustration conveys generic appearance, not tolerances, forming-process evidence or a dimensional model.
Receiving material and assembly contents
Identify the actual bearing component, hole and recess, material and thickness, clearance and full mating stack. List head-side and nut-side washers or plates individually. Do not infer permission to omit every washer from the presence of an integral disc.
Thread, length datum and end
State metric or inch thread system, diameter, pitch and fit, the controlled length datum, threaded and plain-shank lengths, and end requirements. A maker-specific extended thread or semi-cone example does not define all washer-head bolts.
Utility context is not qualification
The original maker discusses pole-line crossarm hardware. Any such enquiry requires the controlled component and assembly drawing, acceptance and installation documents and responsible engineering review. No electrical-service suitability, connection capacity, wood-crushing resistance, torque or tool compatibility is provided here.
Standard identity and edition boundaries
IEEE identifies C135.80-2023 as active and describes inch-based zinc-coated ferrous washer-head bolts within its overhead-line fastener scope, excluding metric bolts. Its official page also lists a proposed corrigendum. The historical C135.38-1987 entry is withdrawn and C135.80-2012 is inactive and superseded; these names do not certify a supplied part or establish automatic equivalence.
Material, finish and supply evidence
Define the actual material/property specification, coating, mating-thread fit and inspection requirements separately. Maker production ranges, grades, domestic origin, inventory and manufacturing processes are not FastenerBridge supply facts. Final commercial and assembly requirements follow the confirmed drawing and quotation.
Specification fields
| Choice or field | What to identify |
|---|---|
| Identity and revision | Selected square-head/integral-disc form, product reference and applicable edition or controlled drawing number/revision. |
| Head and disc | Square head width/height/corners, integral disc diameter/thickness/underside and transitions with drawing-defined tolerances. |
| Receiving interface | Actual bearing material/component drawing, hole/recess, thickness and clearance; head-side and nut-side stack. |
| Thread and end | Metric or inch thread designation,pitch/fit,length datum,threaded/plain lengths and specified end profile. |
| Material and finish | Required material/property designation,coating,mating fit and inspection/traceability documents. |
| Assembly and order | Nut/washer/plate list,assembly-specific acceptance and installation requirements,quantity in bolts or sets,packing and destination. |
Common product questions
Is the washer a separate retained component?
Not in the one-piece form described here. A loose or captive washer assembly requires a different component specification.
Can the existing hex-flange bolt be substituted?
Do not assume so. Compare head drive, integral bearing geometry, receiving clearance and the complete controlled specification.
Does the integral disc authorize removal of all assembly washers?
No. Confirm the required head-side and nut-side components against the actual joint drawing. This page does not provide an installation or utility qualification.
Related product choices
- Hex-flange head and bearing-face selector
- Domed timber head and underhead-fin selector
- Separate retained-washer assemblies
Product references
References checked 10 October 2026 identify structures, not FastenerBridge stock, compliance or brand affiliation. Final requirements follow the selected specification. No normative dimension, load rating or tightening torque is stated.