Proctor Needles Spring Type
Product Code : EL-STLE-10938
Proctor Needles Spring Type (code EL-STLE-10938) are soil penetrometers, also known as Proctor penetrometers, used for a quick field evaluation of soil density by comparison with standard compaction curves drawn in the laboratory. Each needle fits a spring-loaded plunger whose stem reads 0 to 40 kg in 1 kg divisions, the penetration stems are marked every 12.5 mm, and needle points from 0.25 to 6.0 sq. cm are available with a tommy.
Get a quote: use the Add To Cart enquiry button below, or send your quantity and delivery location through the contact page.
Specifications
| Parameter | Detail |
|---|---|
| Also known as | Proctor penetrometers |
| Use | Quick evaluation of the maximum soil density in the field |
| Reference curves | Standard compaction curves of moisture content against density, drawn in the laboratory by the standard compaction method |
| Construction | Needle attached to a spring-loaded plunger |
| Load scale | Plunger stem calibrated 0 to 40 kg in 1 kg divisions |
| Long stem | Marked at every 12.5 mm to read depth of penetration; used with larger-area needles |
| Short penetration stem | Graded in 12.5 mm divisions; used with smaller-area needles |
| Needle points | One each of 0.25, 0.5, 1.0, 1.5, 2.0, 3.5 and 6.0 sq. cm, with one tommy, also available |
| Standards | BS 1377:4 |
| Product code | EL-STLE-10938 |
| Manufacturer | Engineering Lab Equipment, Ambala, Haryana, India |
What Are the Proctor Needles Spring Type Used For?
The force needed to push a needle into compacted fine-grained soil changes with the moisture content and density of the soil, so needle readings taken on the specimens used for the laboratory compaction curves give a reference for site work. On site the operator fits a needle point to suit the soil, pushes the needle steadily into the compacted layer to a depth marked on the stem and reads the force on the 0 to 40 kg scale. Comparing this reading with the laboratory values gives a quick estimate of the density reached. The standard listed for the needles is BS 1377:4.
What to Specify When Ordering
- Quantity — the number of Proctor needle sets required.
- Needle points — which of the 0.25, 0.5, 1.0, 1.5, 2.0, 3.5 and 6.0 sq. cm needle points are needed.
Frequently Asked Questions
What are Proctor needles used for?
They give a quick evaluation in the field of the density reached by compacted soil, by comparison with standard compaction curves of moisture content against density drawn in the laboratory.
What load range does the plunger read?
Its scale, marked on the stem of the spring-loaded plunger, runs from 0 to 40 kg in steps of 1 kg.
How is depth of penetration measured?
The longer stem, used with larger-area needles, is marked every 12.5 mm, and the small penetration stem for smaller-area needles is graded in 12.5 mm divisions.
Which needle point sizes are available?
Needle points of 0.25, 0.5, 1.0, 1.5, 2.0, 3.5 and 6.0 sq. cm are available, one of each, together with one tommy.
Why are different needle areas offered?
Harder soils need a smaller needle point to keep the penetration force within the 0 to 40 kg scale, while softer soils need a larger area to give a readable force.
Which standard is listed for the needles?
The standard listed for the needles is BS 1377:4, the part of the British soil testing standard that deals with compaction-related tests.
OEM Manufacturer
The Proctor Needles Spring Type are made by Engineering Lab Equipment (Engineering Labs Equipment Pvt Ltd) at its works at Plot No. 43, Industrial Park, Sector 2, Growth Center, Saha, District Ambala, Haryana, India. The company designs, makes and tests soil testing equipment for classification, compaction, density, shear and consolidation tests for engineering colleges, polytechnics, technical training institutes and research laboratories in India and overseas, and can build equipment to an institution's own requirements. Tender and OEM enquiries are handled through the Tenders/OEM page.
Related Soil Testing Equipment
- Proctor Penetrometer — spring dynamometer needle penetrometer, 0 to 55 kg scale, with nine needles in wooden case.
- Load Ring Penetrometer — hand cone penetrometer with 1 kN load ring and 30° cone for soil bearing and compaction checks.
- Standard Compaction Test — standard compaction set with 1000 cc steel mould, collar, base plate and 2.6 kg rammer.
- Speedy Moisture Meter — calcium carbide moisture tester with pressure gauge, digital balance and wooden carrying case.
See the full Soil Testing Lab Equipment range or all Civil Engineering Lab Equipment.
Request a Quote
For this and other soil testing lab equipment, schools and colleges can contact Engineering Lab Equipment, a manufacturer, supplier and exporter based in Ambala, India. To ask for a quotation, send the number of sets and the needle point sizes you require and your delivery location through the contact page, or use the Add To Cart enquiry button on this page.
Last updated: October 2026
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