Monogram, blind bolt
OSI-Bolt
Blind bolt designed as a direct replacement for solid-shank pin-and-collar systems.
- Shear 95-112 ksi
- Access Blind (one-sided)
- Diameters 5/32 to 3/8"
- Materials Titanium, A286 CRES +1
- Lead-time risk High
Blind (one-sided), threaded blind bolt: “As the corebolt turns, the nut component travels toward the structure, bearing against the annealed sleeve.” (Monogram OSI-Bolt brochure, p.2, Installation Sequence)
- Shear
- 95-112 ksi
- Blind bulb
- large
- Install
- One-side install
- Diameters
- 5/32, 3/16, 1/4, 5/16, 3/8"
- Lead-time risk (SpecLok assessment)
- High
Typical applications
- ·"Direct replacement for solid shank pin & collar systems" (brochure p.1)
- ·"Suitable for both composite and metallic airframes" (brochure p.1)
Strengths
- +"Directly interchangeable with standard and oversize pin & collar systems" (brochure p.1)
- +"Always breaks flush; no pintail shaving required" (brochure p.1)
- +"95 & 112 KSI shear systems" (brochure p.1)
Trade-offs
- −Monogram installation tooling (brochure)
Also called OSI Bolt, Ti-OSI, BG series. P/N: BG2032 / BG2034 / BG2035 series · Ti-OSI BG2082 · e.g. BG2082-06-05
Datasheet strength: "95 and 112 KSI shear systems" (OSI-Bolt brochure p.1); Ti-OSI rated 95 KSI, tensile "meets spec reqmnts. of HL11 with HL79 aluminum collar" (Monogram catalog chart).
Standards
- Monogram BG series (procurement spec BG2000)
Materials and galvanic compatibility vs CFRP
| Alloy | Shear | vs CFRP | Notes | Source |
|---|---|---|---|---|
| Titanium | 95 ksi | low | Ti-OSI: 6-4 Ti body, 6-6-2 Ti corebolt (BG2062/2064/2065) | OSI brochure p.11: 5,360 lb double shear at -06 (95 ksi); catalog chart 95 KSI |
| A286 CRES | 95 ksi | low | A-286 body (BG2034/2035); the BG2032 tension head is in the 112 ksi group | OSI brochure p.11: 5,360 lb (BG2034/2035) / 6,300 lb (BG2032) double shear at -06 |
| Inconel | 112 ksi | low | Inconel 718 body & corebolt (BG2042/2044/2045) | OSI brochure p.11: 6,300 lb double shear at -06 (112 ksi system, p.1) |
vs CFRP: MIL-STD-889C Table I, graphite column: high = incompatible in all environments; low = compatible except sea-water immersion; unrated = SpecLok has not read a rating for this material.About derived ksi
Specs source: Monogram OSI-Bolt brochure ↗: p.1 features (3/16"-3/8", 95 & 112 KSI, 1/16" grips); p.2 install sequence; p.3-5 head series & materials. Lead-time risk is SpecLok's sourcing assessment, not a datasheet value.
6 head styles
Drawn from the -6 (3/16") row: B hex, H head hts, D .1885-.1895. Monogram drawing BG2081 Rev J, Table I, BG2081-06 ↗
Protruding hex head
- BG2031: A286, 95 KSI shearMonogram drawing BG2031 Rev C, title block ↗
- BG2041: Inconel 718, 112 KSI shearMonogram drawing BG2041 Rev C, title block ↗
- BG2081: Titanium, 95 KSI shear-05 to -16; X = 1/64" oversize, Y = 1/32" oversize (Table I).Monogram drawing BG2081 Rev J, title block ↗
Drawings BG2031 to BG2086 (2013 revisions) and the 2003 brochure. BG2042, BG2062, BG2064 and BG2065 appear only in the brochure.
Head styles (manufacturer terms)
- Protruding hex head (BG2031, BG2041, BG2081)
- Protruding head (BG2035, BG2045, BG2065, BG2085)
- 100° flush tension head (BG2032, BG2042, BG2062, BG2082)
- 130° flush tension head (BG2083)
- MS 20426 100° flush shear head (BG2034, BG2044, BG2064, BG2084)
- 100° flush (ASNA2391) shear head (BG2086)
Threaded / torqued · 3 steps
1/3Inserted, bulbing begins
“The fastener is inserted into the prepared hole. The installation tool is first placed over the flatted corebolt; the nose piece then engages the recesses of the body and installation is facilitated. As the corebolt turns, the nut component travels toward the structure, bearing against the annealed sleeve. This movement forces the sleeve over the tapered nose of the body to begin the initial bulbing action.”
Monogram OSI-Bolt brochure, p.2, Sequence #1 ↗
Drawing traced from: Panel 1.
Source images (3): patent and government drawings
A patent drawing shows the patented design, which can differ in detail from today's catalog part. Each image says why it is tied to this family.
Official manufacturer install demonstration: OSI-Bolt installation.
Installation verification and preload
Installed preload
- 3/16" Ti-OSI (BG2082-06), catalog chart: 800 lb minimum required (50% of min UTS) · 1,200 lb typical
No per-size preload table is published; the governing installation/inspection spec BG2003 is not publicly available. The 50%-of-UTS minimum is the highest preload ratio in Monogram's own comparison chart.
What to check after install
- Breaks flush by design: max break-off (high points) measured from the head, .015" for -06/-08 and .020" for -10/-12 (brochure installed-dimensions table; product drawings give .010"-.025" by size). No corebolt shaving required.
- Blind-side footprint J dia minimums .290"/.380"/.475"/.560" and max blind protrusion K .750"-1.100" for -06 through -12.
- Detailed inspection criteria beyond break-off and installed dimensions live in BG2003, which is not public.
Check gauges (1) and sources.Details
- None published in the accessible documents; gauges would be specified in BG2003.
Sources: OSI-Bolt brochure · BG2044 drawing · Monogram catalog (preload chart). Acceptance limits belong to the controlling spec; verify against your program's process documentation.
- Tool
- Monogram OSI-Bolt tooling: pneumatic pistol, close quarter and right angle (brochure contents); "can be installed with standard NAS1675 installation tooling" (p.1)
- Special / proprietary
- Special tooling · proprietary
- Training
- Not stated in the cited documents.
- Inspection
- Break-off measured from the head; installed dimensions per brochure (see verification below).
"Designed as a direct replacement for solid shank pin & collar systems; its shear, tensile and pre-load properties meet or exceed that of its pin & collar counterparts" (brochure p.1). "The corebolt fractures flush with the fastener head" (p.2).
The published install tool and nose for each size, other access options, and the gauges that check the install, from the manufacturer's own tool tables.
Tool: Monogram OSI-Bolt tooling: pneumatic pistol, close quarter and right angle (brochure contents); "can be installed with standard NAS1675 installation tooling" (p.1)
The OSI-Bolt brochure lists pneumatic pistol, close quarter and right angle tooling and says the fastener "can be installed with standard NAS1675 installation tooling"; the tool table lives in BG2003, which is not public.
Full tool tables, envelopes, clearances and source notesCompare tooling burden across all 25 families
Removal
No published removal procedure found; follow the manufacturer's instructions. Manufacturer page ↗
BG2082
Diameters 5/32", 3/16", 1/4", 5/16", 3/8" · 8 grip lengths
- Manufacturer
- Monogram
- Category
- Blind bolt
- Datasheet (PDF) ↗
- Manufacturer page ↗
- Monogram OSI-Bolt brochure ↗: p.1 features (3/16"-3/8", 95 & 112 KSI, 1/16" grips); p.2 install sequence; p.3-5 head series & materials.
Find the part number for your stack
Enter your stack thickness and diameter to get the BG2082 dash number.
Dash numbers and grips: Monogram drawing BG2082 Rev AA ↗
Sourcing
Lead-time risk (SpecLok sourcing assessment): High
Get quotes: SpecLok sources this from authorized distributors and returns price, lead time and certs.You buy from the authorized distributor, who is named on your returned quote. SpecLok is free for buyers.
Supply signalfor this family
- 169 NSNs carry a part number of this family, recorded by 14 CAGE codes (FLIS, March 2025).
- Last DoD award for NUT ASSEMBLY,SELF-LOCKING,GANG C items (FSC 5310): 2026-06-25; 111 awards since 2025-10-01.
- Last DoD award for RIVET,BLIND items (FSC 5320): 2026-06-26; 3,082 awards since 2025-10-01.
- No SpecLok quotes yet.
A signal from records SpecLok holds, not availability, stock or a lead-time promise. FLIS lists who has recorded a part number for the item, not who makes it today. DoD awards carry no NSN or part number, so award activity is for the item name's class.
Sources: DLA FLIS Data Electronic Reading Room (PUB LOG) ↗, DLA PUB LOG ↗, USAspending.gov award search API ↗; DoD award data 2025-10-01 to 2026-07-06; compiled 2026-09-28.
Image credits: Monogram Aerospace Fasteners, OSI-Bolt® product page (pennaero.com) ↗. Product images belong to their manufacturers.
Sources (23)
- Monogram OSI-Bolt brochure
- OSI-Bolt datasheet (PDF)
- Monogram product page
- OSI-Bolt installation video
- Monogram drawing BG2031 Rev C
- Monogram drawing BG2041 Rev C
- Monogram drawing BG2081 Rev J
- Monogram drawing BG2035 Rev H
- Monogram drawing BG2045 Rev W
- Monogram drawing BG2085 Rev U
- Monogram drawing BG2032 Rev E
- Monogram drawing BG2082 Rev AA
- Monogram drawing BG2083 Rev P
- Monogram drawing BG2034 Rev AG
- Monogram drawing BG2084 Rev AB
- Monogram drawing BG2086 Rev L
- MIL-STD-889C Table I, graphite column: high = incompatible in all environments; low = compatible except sea-water immersion; unrated = SpecLok has not read a rating for this material.
- BG2044 drawing
- Monogram catalog (preload chart)
- DLA FLIS Data Electronic Reading Room (PUB LOG)
- DLA PUB LOG
- USAspending.gov award search API
- Monogram (PennAero) Aerospace Fasteners
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